G 10N kg 2mks 8. A crystal of potassium permanganate was carefully introduced at the bottom of water column held in a gas jar. After sometime the whole volume of water was coloured. Explain this observation. 1mks 9. Define absolute zero temperature for an ideal gas. 1mk 10. A substance of mass 2kg and specific heat capacity 400jkg-1k-1 initially at 80 c is immersed in water at 19 c. If the final temp is 20 c. Calculate the mass of water specific heat capacity of water 4200jkg-1k-1. 3mks 11. The cover of a ball point has a small hole on the stem as shown below Explain its function 1mk 100 cm 200g Rubber ball 10cmwww.freekcsepastpapers.comPage 118 12. Give a reason why hot water put in a sufuria covered with a blackened aluminium foil cools faster than one covered with a shiny foil . 1mks 13. A mass of 7.5kg has a weight of 30N on a certain planet. Calculate the acceleration due to gravity on this planet 2mks SECTION B 55 MARKS 14. A Define angular velocity and state its SI unit 2mk b A stone of mass 500g is whirled in a vertical circle at 5 revolutions per Second. If the length of the string used is 1.5m, determine i The angular velocity 3mks ii The maximum tension of the string 3mks c State three factors that will make the stone to remain in a state of vertical motion 3mks d A glass block of mass 300g is placed on a frictionless rotating table while fixed 10cm from the centre of the table by a light thread. The string can withstand a maximum tension of 6.6N. Determine the maximum velocity that the table can attain before the string cuts. 3mks 15. A State Hooke s law 1mk b A form 4 student did an experiment on Hooke s law and from his data drew the following graph. GRAPH OF FORCE AGAINST EXTENSION From the graph, i Determine the spring constant.


3mks 15. A State Hooke s law 1mk b A form 4 student did an experiment on Hooke s law and from his data drew the following graph. GRAPH OF FORCE AGAINST EXTENSION From the graph, i Determine the spring constant. 2mks ii Work done in producing an extension, e of 8cm. 2mks c State the factors which affect the spring constant calculated in b i above 2mks d A column of air 26cm is trapped by mercury thread 5cm long as shown in the diagram below. Www.freekcsepastpapers.comPage 119 e When the tube is laid horizontally as in figure ii the air column is now x cm long. When inverted as shown in figure iii , the length of the column is y cm. Find i The values of x 2mks ii The values of y 2mks Take atmospheric pressure to be 70cmHg 16. A State Newtons third law of motion. 1mk b A car of mass 900kg is initially moving at 20m s, calculate i Acceleration of the car 2mks ii The force required to bring the car to rest over a distance of 15M. 2mks c Two trolleys of masses 2.0 kg and 1.5kg travelling towards each other at 0.20m s and 0.35m s respectively combine head on. The trolleys combine on collision. Calculate the velocity of the combined trolleys. 3mks d A stone is projected vertically upwards with a velocity of 30m s from the ground. Determine the maximum height reached. 3mks 17. A State the law of floatation 1mk b The diagram below shows a wooden block of dimensions 50cm by 40cm by 20cm held in a position by a string attached to the bottom of a swimming pool. Density of block is 600kg m3, density of water 1000kg m3 The three forces acting on the block are tension T in the string, the weight W of the block and the up thrust U due to water.


3mks 17. A State the law of floatation 1mk b The diagram below shows a wooden block of dimensions 50cm by 40cm by 20cm held in a position by a string attached to the bottom of a swimming pool. Density of block is 600kg m3, density of water 1000kg m3 The three forces acting on the block are tension T in the string, the weight W of the block and the up thrust U due to water. I Write an equation relating T, W and U when the block is at stationery position. 1mk ii What is the weight of the block? 3mks iii What is the weight of the water displaced by the block? 2mks iv Determine the tension T on the string. 2 mks c Some ether is put in a combustion tube and two glass tubes inserted into the tube through a cork as shown in the figure below. The combustion tube is then put into a smaller beaker containing some water and a thermometer dipped in the water. When air is blown into the ether, the reading in the thermometer lowers. Explain this observation 2mks www.freekcsepastpapers.comPage 120 18. A Complete the diagram below to show how the pulleys can be used to raise a load, L by applying an effort, E 2mks b The pulley system above has a mechanical advantage of 3. Determine i The velocity ratio of the system 2mks ii The efficiency of the system 2mks iii The effort when a load of 60N is raised 2mks www.freekcsepastpapers.comPage 121 MURANG A SOUTH MULTILATERAL EXAMS I, 2023 Kenya Certificate of Secondary Education K.C.S.E 232 2 PHYSICS PAPER 2 TIME: 2HRS INSTRUCTIONS TO CANDIDATES: 1. Answer ALL the questions in section A and B. 2. All working MUST be clearly shown. 3. Non-programmable silent electronic calculators and KNEC mathematical tables may be used. SECTION A 25 MARKS 1. The figure below shows two rays drawn from an object on to the mirror.


Non-programmable silent electronic calculators and KNEC mathematical tables may be used. SECTION A 25 MARKS 1. The figure below shows two rays drawn from an object on to the mirror. Complete the ray diagram to show the position of the image. 2 marks 2. A small chain is often seen hanging at the back of a petrol carrying lorry. State and explain its significance. 2marks 3. A Define diffraction with respect to waves. 1 mark b The diagram below show consecutive wave fronts. If the waves are moving towards the barrier, draw the wave fronts as they appear after passing through the aperture. 2 marks 4. State what determines the carrying capacity of an accumulator. 1mark 5. Sketch a displacement time graph of a wave of frequency 4HZ and amplitude 3.0cm over a time interval of 1.5 seconds 3mks 6. The figure below shows a set up used to study sound waves. Www.freekcsepastpapers.comPage 122 It is observed that when the bottle is shaken sound from the metal plates is heard. State and explain the observation that would be made if a little hot water is poured into the bottle and after sometime the cork is tightly replaced and the bottle shaken. 2 marks 7. The figure below shows a circuit diagram with cells in parallel. Each cell has e.m.f of 1.5V and internal resistance of 0.5 and the resistance of the bulb is 6 each. Determine the ammeter reading when the switch is closed. 3marks 8. An alternating voltage of peak value 15v and frequency 25Hz is applied to the terminals of a Cathode ray oscilloscope. The Y-gain is set at 5 v cm and the time base at 10 ms cm. Draw the trace observed on the screen. 2 marks 9. Name all the radiations of the electromagnetic spectrum which have higher wavelengths than the visible light in their increasing wavelengths. 1 mark 10. The figure below shows a diagram of circuit breaker . Explain how it operates 3mks 11. A resistance wire is 2 m long and has a cross-sectional area of 0.50 mm2. If its resistance is 2.6 , calculate its resistivity.


Explain how it operates 3mks 11. A resistance wire is 2 m long and has a cross-sectional area of 0.50 mm2. If its resistance is 2.6 , calculate its resistivity. 3 marks SECTION II 55 MARKS 12. A The figure below shows a charged electroscope and two aluminum plates A and B arranged as shown. 1cm 1cmwww.freekcsepastpapers.comPage 124 14. A i What do you understand by the term accommodation? 1mk ii An object is placed 40cm in front of a concave lens of focal length 20cm; determine the position of the image. 3mks b The following graph shows the variation of image distance, v, with magnification, m, for a converging lens. Using the graph and the equation 1 to determine: i The object position when the image position is 45cm. 3marks ii The focal length of the lens. 1 mark iii The power of the lens. 2 marks c The following figure below shows an eye defect Name the defect and show on the same diagram how the defect could be corrected. 3 marks www.freekcsepastpapers.comPage 125 15. A What do you understand by the term mutual induction? 1 mark . B State two factors that determine magnitude of e.m.f induced in a coil. 2 marks . C The diagram below shows an induction coil used to produce sparks. I Name parts labeled A and B. 2marks ii Briefly explain how the induction coil works. 3 marks b A transformer has 800 turns in the primary and 40 turns in the secondary winding. The alternating e.m.f connected to the primary is 240V and the current is 0.5A. Determine I the secondary e.m.f 2marks II the power in the secondary if the transformer is 95 efficient. 2mks 16. A The mains electricity is transmitted at high voltages. State two dangers of this high voltage transmission. 2marks b What is a fuse? 1mark c The figure shows a section of a domestic wiring.


State two dangers of this high voltage transmission. 2marks b What is a fuse? 1mark c The figure shows a section of a domestic wiring. I Identify two serious mistakes in the circuit. 2marks ii Explain why the circuits in domestic wiring should be connected in parallel with the main supply. 1mark iii Mrs. Sitima has two 2.5KW electric heater, 2.0KW electric stove, two 60W electric bulbs, 500W electric fan and 1.0Kw electric pressing box. Her power supply is 240V and main fuse 30A. I Can she connect all the appliances to her power supply at the same time? 2marks II If the cost of electricity is Ksh.6.50 per unit, calculate the cost of using electric stove and electric pressing box for 3 hours a day in the month of June. 3marks www.freekcsepastpapers.comPage 126 MURANG A SOUTH MULTILATERAL EXAMS I, 2023 Kenya Certificate of Secondary Education K.C.S.E 232 3 PHYSICS PAPER 3 PRACTICALS CONFIDENTIAL INSTRUCTIONS TO SCHOOLS Question 1 Metre rule Knife edge 10 microscope slides A 50g mass A piece of cello tape A Vernier caliper can be shared Resistance wire fitted on a millimeter scale labeled MN, Nichrome wire G 32mm Switch Voltmeter 0-5V Ammeter 0-2.5A Two dry cells in a cell holder 8 connecting wires ,atleast 4 with crocodile clips Micrometer screw gauge To be shared Question 2 - A retort stand, boss and clamp. -. Test tube - Piece of duplicating paper - A thermometer -100-1100 - A 200ml beaker containing some water - A tripod stand and wire gauze - A cardboard carton with a hole in the middle with the size of the thermometer.


2marks II If the cost of electricity is Ksh.6.50 per unit, calculate the cost of using electric stove and electric pressing box for 3 hours a day in the month of June. 3marks www.freekcsepastpapers.comPage 126 MURANG A SOUTH MULTILATERAL EXAMS I, 2023 Kenya Certificate of Secondary Education K.C.S.E 232 3 PHYSICS PAPER 3 PRACTICALS CONFIDENTIAL INSTRUCTIONS TO SCHOOLS Question 1 Metre rule Knife edge 10 microscope slides A 50g mass A piece of cello tape A Vernier caliper can be shared Resistance wire fitted on a millimeter scale labeled MN, Nichrome wire G 32mm Switch Voltmeter 0-5V Ammeter 0-2.5A Two dry cells in a cell holder 8 connecting wires ,atleast 4 with crocodile clips Micrometer screw gauge To be shared Question 2 - A retort stand, boss and clamp. -. Test tube - Piece of duplicating paper - A thermometer -100-1100 - A 200ml beaker containing some water - A tripod stand and wire gauze - A cardboard carton with a hole in the middle with the size of the thermometer. -. A burner - A rubber band - A stop watchwww.freekcsepastpapers.comPage 127 MURANG A SOUTH MULTILATERAL EXAMS I, 2023 Kenya Certificate of Secondary Education K.C.S.E 232 3 PHYSICS PRACTICAL TIME: 2 Hours INSTRUCTIONS TO CANDIDATES a Answer ALL the questions. B You are supposed to spend the first 15 minutes of the 2 hours allowed for this paper reading the whole paper carefully before commencing your work. C Marks are given for a clear record of the observations actually made, their suitability, accuracy and the use made of them. D Candidates are advised to record their observations as soon as they are made.


B You are supposed to spend the first 15 minutes of the 2 hours allowed for this paper reading the whole paper carefully before commencing your work. C Marks are given for a clear record of the observations actually made, their suitability, accuracy and the use made of them. D Candidates are advised to record their observations as soon as they are made. QUESTION ONE PART A You are provided with the following Metre rule Knife edge 10 microscope slides A 50g mass A piece of cellotape A pair of Vernier callipers Proceed as follows a Using the vernier calipers provided measure the length L and the width, W of the microscope slide L 1mk W 1mk b Stack ten 10 slides together using a cello tape as shown below fig 1. I Measure the thickness T of the stack of microscope slides. 1mk T ii Determine the volume v of the stack 2mk V LWT c Balance the metre rule at its centre of gravity and maintain the position of the fulcrum on the centre of gravity throughout the experiment Place the 50g mass and the stack of slides as shown in figure 4 below Adjust the position of both the50g mass and stacked slides until the rule is again balanced making the distances x and y as large as possible i x 1mk y 1mk Figure 1 T y x 50gwww.freekcsepastpapers.comPage 128 ii Calculate the mass m in grams of the stacked slides given that 2mk yxm50 iii Determine the density of glass given that vmdensity 2mk PART B You are provided with the following apparatus: Resistance wire fitted on a milliameter scale labelled MN Switch Voltmeter Ammeter Two dry cells in a cell holder Six connecting wires Micrometer screw gauge Proceed as follows; i. Set up the apparatus as shown in the Figure 3 below; ii. Remove the crocodile clip from the resistance wire MN and close the switch. Record the voltmeter reading V0. V0 ........................................ 1mark iii. Attach the Jockey to the resistance wire such that l 50cm iv.


V0 ........................................ 1mark iii. Attach the Jockey to the resistance wire such that l 50cm iv. Record the voltmeter and ammeter readings as V1 and Z respectively V1 .............................................. 1mark Z ............................................. 1mark v. Determine the value of X given that 1mark vi. Use the equation below to determine the value of k , where m 2.549 2marks vii. Measure the diameter d of the of the wire on the milliameter scale using the micrometer screw gauge d ..............................mm .....................................m 1mark viii. Determine the resistivity of the wire used in this experiment given that 2marks www.freekcsepastpapers.comPage 129 Question two You are provided with the following; - A retort stand, boss and clamp. -. Test tube - Piece of duplicating paper - A thermometer - A large beaker containing some water - A tripod stand and wire gauze - A cardboard with a hole in the middle - A burner - A rubber band - A stop band - A stop watch Proceed as follows; a Set up the apparatus as shown in figure 4 below. B Heat the water in the beaker provided and leave it to boil c Wrap the given piece of duplicating paper round the bulb of the thermometer. Use rubber band to hold the paper in place. D Place the thermometer inside in the dry test tube. E Place the test tube in the water as shown in the diagram above. Make sure that the water does not enter the test tube. Leave the test tube in the boiling water until the thermometer indicates a steady temperature. F Remove the thermometer and immediately start the stop watch. While holding the thermometer in air record the readings of the thermometer T1 at intervals of 30seconds for 10 minutes.


3marks 2. The density of a solid decreases after heating. Explain. 2marks 3. When a drop of oil is placed on the surface of water it spreads out forming a circular patch. Explain this observation. 2marks 4. A uniform meter rule is balanced as shown in the figure 2 below. The volume of the immersed object is 13. 5cm3. Determine the relative density of the liquid. 3marks 5. Give a reason why a person may nose bleed after ascending a high mountain. 1mark 6. A turntable of radius 10cm is rotating at 42 revolutions per second. Determine the linear speed of a point on the circumference of the turntable. 3marks 7. Figure 3 below shows a glass filled with hot liquid placed on a table immediately after wiping with water. State and explain what is observed when one tries to lift the glass after a few minutes. 2marks 8. In using the lift pump to raise water from a bore hole. It is observed that practically the height the water is raised cannot be 10m and more. Give two reasons for this observation. 2marks Hot liquid Wet table Fig. 3www.freekcsepastpapers.comPage 99 9. When a mass of 2kg is hang from a single spring, the spring extends by a distance 10cm. Determine the total extension in the set up in Figure 4 below given that the springs are identical 2marks 10. Define the term viscosity. 1mark 11. State one reason why the efficiency of a machine is always less than 100 1mark 12. State two factors that determine the critical speed for a car moving along a curved road. 2marks SECTION B 55 MARKS Answer all the questions in this section 13. A State the law of Floatation. 1mark b A submarine made of iron was observed to float in water while a piece of iron rod sinks in water. Explain this observation 2marks c A solid displaces 5.0cm3 of liquid when floating and 20cm3 when fully immersed in it. Given that the density of the solid is 1.2g cm3.


1mark b A submarine made of iron was observed to float in water while a piece of iron rod sinks in water. Explain this observation 2marks c A solid displaces 5.0cm3 of liquid when floating and 20cm3 when fully immersed in it. Given that the density of the solid is 1.2g cm3. Calculate i The weight of the solid 2marks ii Upthrust on the solid when floating 1mark iii The density of the liquid 3marks iv The upthrust when the body is fully submerged 3marks d Define the term relative density as used in liquids 1mark 14. A Define specific latent heat of fusion of a substance 1mark b Water of mass 400g at a temperature of 60oC is put in a well lagged copper calorimeter of mass 160g. A piece of ice at 0oC and mass 40g is placed in the calorimeter and the mixture stirred gently until all the ice melts. The final temperature, T, of the mixture is then measured. Specific latent heat of fusion of ice 334000J kg, specific heat capacity of water 4200J kgK specific heat capacity of copper 400J kgK Determine: i The heat absorbed by the ice during melting. 2marks ii Total heat gained by the melted ice Give your answer in terms of T 2marks iii Total Heat lost by the water and Calorimeter 3marks iv The final temperature T of the mixture. 2marks c Figure 5 below shows a block of ice with two heavy weights hanging such that the copper wire connecting them passes over the block of ice block resting on wooden support. It is observed that the wire gradually cuts its way through the ice block, but the ice is left as one piece. State the factor behind the observation. 1mark 2 Kg Fig. 4 Weights Wooden block Ice Block Fig. 5 Copper wirewww.freekcsepastpapers.comPage 100 15. A i Define the Impulsive force in terms of momentum. 1mark ii A striker kicks a ball of mass 250g initially at rest with a force of 75N.


5 Copper wirewww.freekcsepastpapers.comPage 100 15. A i Define the Impulsive force in terms of momentum. 1mark ii A striker kicks a ball of mass 250g initially at rest with a force of 75N. If the foot was in contact with the ball for 0.10sec. Calculate the take-off velocity of the ball. 3marks b A bullet of mass 20g moving at 400 m s strikes a block of wood of mass 3.5kg initially at rest. The bullet sticks into the block and the two move off together on a horizontal surface, where a frictional force of 4N is acting between the block and surface. I Determine the initial common velocity of bullet and wooden block. 3marks ii What distance does the block move before coming to rest? 3marks c Explain why a paratrooper flexes his legs as he lands. 2marks 16. The figure 6 below shows an inclined plane, a trolley of mass 30kg is pulled up a slope by a force of 100N, parallel to the slope. The trolley moves so that the centre of mass C travels from points A to B. i What is the work done on the trolley against the gravitational force in moving from A to B.? 2marks ii Determine the work done by the force in moving the trolley from A to B. 2marks iii Determine the efficiency of the system. 3marks iv Determine the work done in overcoming the frictional force. 1mark v Determine the mechanical advantage of the system. 2marks 17. Figure 7 below shows a trolley moving on a circular rail with a vertical plane, given that the mass of the trolley is 250g and the radius of the rail is 1.6m. i Determine the minimum velocity at which trolley passes point X. 3marks ii Find the angular velocity at point Z 2marks iii The force exerted on the rail at this point Z. 3marks iv State one application of circular motion in daily life. 1mark A C 100N B 10m 15 Fig.


2marks b An optician in Eldoret Hospital examined an eye of a patient and made the following observations: Eye ball too small and the focal length of the eye lens too short. I State the eye defect the patient could be having. 1mark ii Use a diagram to describe how the defect could be corrected. 2marks c The graph below shows the variation of 1 v and 1 u in an experiment to determine the focal length of a lens. I Use the graph to determine the focal length. 3marks ii What is the power of the lens used? 1mark 15. A Define electric resistance. 1mark b Figure 7. Shows three resistors connected as shown. Fig 7 If the voltmeter reads 4V, find the i Effective resistance. 2marks ii Current through the 3 resistor. 2marks iii Potential difference across the 8 resistor. 2marks c i What is meant by the term lost volts ? 1mark ii A cell supplies a current of 0.5A when connected to a 2 resistor and 0.25A when connected to a 5 resistor. Find the e.m.f and the internal resistance of the cell. 4marks www.freekcsepastpapers.comPage 104 16. A On the axes provided below, sketch a graph showing the variation of frequency with wavelength at constant velocity. 1mark b Tv waves of frequency 6MHz travels with a speed of 3.0 x 108 m s. What is the wavelength? 2marks c Figure 8. Shows circular waves approaching a concave reflector. Fig. 8 Show the reflected waves and the missing part of incident wave 2marks d State two conditions necessary for two progressive waves traveling in opposite directions to form stationary waves. 2marks e Figure 9 shows the set up used to demonstrate interference of sound. Fig 9 i An observer O, moves along XY. State the observation s made. 1mark ii State what would be observed if a cathode ray oscilloscope is moved along line XY. 2marks iii What will a student hear if he moves along the line OC?


State the observation s made. 1mark ii State what would be observed if a cathode ray oscilloscope is moved along line XY. 2marks iii What will a student hear if he moves along the line OC? 1mark iv Why are the loudspeakers connected to the same audio frequency generator? 1mark 17. A State one factor that affects the capacitance of a capacitor. Mark b Figure 10 shows a circuit diagram with three capacitors. Fig 10 Frequency f Wavelength www.freekcsepastpapers.comPage 105 i Determine the effective capacitance of the arrangement. 2marks ii Find the energy stored in the combinations of capacitors. 3marks c Explain why it is not advisable to shelter under a tree when it is raining. 1mark 18. A State two dangers of high voltage transmission. 2marks b A generator produces 150KW at a voltage of 5 kV. The voltage is stepped up to 60kV and transmitted through cables of resistance 150 to a step down transformer in a substation. If both transformers are 80 efficient, Calculate the:- i Current through the transmission cables. 3marks ii Power lost during transmission. 3marks 19. A The half life of cobalt 60 is 5years. How long will a sample take for the activity to decrease to 1 16 of its original value? 3marks b The graph below shows radioactive decay of iodine. Use the graph to determine the:- i Fraction of the amount remaining after 16.2 days. 1marks ii Determine the half life of iodine. 1marks iii Mass remaining after 17 days.


Use the graph to determine the:- i Fraction of the amount remaining after 16.2 days. 1marks ii Determine the half life of iodine. 1marks iii Mass remaining after 17 days. 1mark www.freekcsepastpapers.comPage 106 MBORANU FORM IV JOINT EVALUATION, 2023 Kenya Certificate of Secondary Education K.C.S.E 232 3 PHYSICS PRACTICAL PAPER 3 TIME: 2 HOURS CONFIDENTIAL Each candidate should be provided with the following: QUESTION 1 Resistance wire fitted on a scale labeled MN SW 28 Switch Voltmeter 0-3v or 0-5V Ammeter 0-2.5A OR 0-3A Two dry cells Six connecting wires at least 4 with crocodile clips QUESTION 2 A concave mirror Focal length 15 cm Mirror holder. A screen A meter rule A candle A match box to be shared A boiling tube A measuring cylinder 50ml A half metre rule Water in a beaker about 100ml A stand complete with boss and clamp Vernier callipers may be shared www.freekcsepastpapers.comPage 107 MBORANU FORM IV JOINT EVALUATION, 2023 Kenya Certificate of Secondary Education K.C.S.E 232 3 PHYSICS PAPER 3 PRACTICAL July Aug, 2023 TIME: 2 HOURS INSTRUCTIONS TO CANDIDATES: Answer all the questions You are supposed to spend the first 15 minutes of 2 hours reading the whole paper carefully before commencing your work. Marks are given for a clear record of the observations actually made, their suitability, accuracy and the use of them Record your observations as soon as you make them. Mathematical tables, slide rules and silent non-programmable electronic calculators may be used.


A screen A meter rule A candle A match box to be shared A boiling tube A measuring cylinder 50ml A half metre rule Water in a beaker about 100ml A stand complete with boss and clamp Vernier callipers may be shared www.freekcsepastpapers.comPage 107 MBORANU FORM IV JOINT EVALUATION, 2023 Kenya Certificate of Secondary Education K.C.S.E 232 3 PHYSICS PAPER 3 PRACTICAL July Aug, 2023 TIME: 2 HOURS INSTRUCTIONS TO CANDIDATES: Answer all the questions You are supposed to spend the first 15 minutes of 2 hours reading the whole paper carefully before commencing your work. Marks are given for a clear record of the observations actually made, their suitability, accuracy and the use of them Record your observations as soon as you make them. Mathematical tables, slide rules and silent non-programmable electronic calculators may be used. Take g 10ms-2 QUESTION 1 a You are provided with the following apparatus: Resistance wire fitted on a millimeter scale labeled MN Switch Voltmeter 0-3V or 0-5V Ammeter 0-2.5 or 0-3 Two dry cells Six connecting wires i Set up the apparatus as shown in the fig 1 below. Ii Remove the crocodile clip from the resistance wire MN and close the switch. Record the voltmeter reading. V0 V 1mk iii Attach the crocodile clip to the resistance wire such that L 0. Read and record the ammeter reading at L 0 I0 A 1mk iv Repeat the procedure in iii and for L 10cm, 20 cm, 30 cm, 40 cm, 50cm, 60 cm, 70cm and 80 cm and record the voltmeter and ammeter reading in the table below. Switch L M N V A Crocodile clipwww.freekcsepastpapers.comPage 108 v Complete the table below.


1 mark b Set up the apparatus as in figure 2 below. Fig 2 c Put the object at a distance u 30cm and from the concave mirror. Adjust the position of the screen until a sharp image is formed on the screen. Record the distance V Candle Screen MirrorU Vwww.freekcsepastpapers.comPage 109 d Repeat procedure c above for the distance u 40cm and record the new distance V, in the table below e Complete the table below. 3 marks f Given that , calculate the values of f in each case; 3 marks 2. PART B You are provided with the following: a boiling tube a measuring cylinder a half metre rule water in a container a stand complete with boss and clamp Vernier callipers may be shared Proceed as follows: a i Using the Vernier callipers measure the internal diameter, d , of the boiling tube provided d ........................................................ cm 1 2 mark ii Using the half meter rule measure the height of the boiling tube provided h cm 1 2 mark iii Calculate the volume of boiling tube 2marks b i Clamp the boiling tube vertically as shown in the figure 1 below. Ii. Using the measuring cylinder pour 25cm3 of water into the boiling tube. Measure and record in the table below the height h, of water in the boiling tube. Iii Repeat the procedure in b ii for other volumes of water, V, shown in the table. 3marks Volume, V, of water cm Height, h, of water cm S V h 25 35 45 iv Calculate the average value of S and state what it represents 2marks hU cm V cm m V U m 1 30 40 1 mvfwww.freekcsepastpapers.comPage 84 MECS II CLUSTER EXAMINATION, 2023 Kenya Certificate of Secondary Education. 232 1 PHYSICS Paper 1 TIME: 2HRS Instructions to candidates i Answer ALL the questions in section A and B. ii All working MUST be clearly shown. Iii Non programmable silent calculators may be used.


232 1 PHYSICS Paper 1 TIME: 2HRS Instructions to candidates i Answer ALL the questions in section A and B. ii All working MUST be clearly shown. Iii Non programmable silent calculators may be used. Constant: g 10N kg or 10m s2 SECTION A: 25 MARKS 1. The figure below shows a section of a meter rule used to measure length of a piece of wood. Find the length of the wood 2marks 2. The diagram below shows a capillary tube immersed in water. A Make a sketch on the figure alongside b to show the appearance of the capillary tube if it was inserted in mercury. 1 mark b Explain the difference if any between figure a and b above 2 marks 3. Explain why a partially inflated balloon released at sea level would become fully inflated at a higher altitude. 1mark 4. A catapult is used to project a stone of mass 40.0g vertically upwards to a height of 50.0m. Calculate the amount of elastic potential energy initially present in the catapult. 2marks 5. A turning effect of force depends on the magnitude of the force. State any other factor that determines the moment of a force 1mark i Mercury is usually preferred over water for use as a barometric liquid. Give a reason for this. 1mark ii State the property of Freon that makes it suitable for use as refrigerant. 1mark iii Other than the mass of ice, State another physical quantities that remain constant while pure ice is being converted to water. 1mark 6. Giving a reason, explain why it s advisable for luggage carrier compartment to be put under the seats than at the roof tops of the buses. 1 mark 7. Other than angle of banking, state any other factor that affects the critical velocity of a vehicle negotiating a bend. 1 mark 8. A balloon filled with argon gas of volume 200 cm3 at the earth s surface where the temperature is 200C, and the pressure 760mm of mercury. If it is allowed to ascend to a height where the temperature is 00C and the pressure 100mm of mercury, calculate the volume of the balloon. 2marks 9.


A balloon filled with argon gas of volume 200 cm3 at the earth s surface where the temperature is 200C, and the pressure 760mm of mercury. If it is allowed to ascend to a height where the temperature is 00C and the pressure 100mm of mercury, calculate the volume of the balloon. 2marks 9. It is a common behavior for a high jumper to slightly flex their knees just before landing. Explain the importance of this behavior from your knowledge of physics. 1mark 11. The figure below shows a manometer containing water. Air is blown across the mouth of one tube and the levels of the water changes as shown. Explain why the level of water in the left limb of manometer is higher. 2 marks Blow air Water a b www.freekcsepastpapers.comPage 85 12. The figure below shows a uniform rod AB of weight 20N pivoted at A. If the system is in equilibrium, determine the weight W shown. 3marks 13. A cemented floor feels cold to the feet, but a woolen carpet on the same floor feels warm. Explain this. 1mark 14. The diagram below shows an arrangement used to determine the upper fixed point of ungraduated thermometer. I Why is the bulb of thermometer not dipped in the water? 1mark ii Explain how the sensitivity of a thermometer can be improved. 1mark SECTION B 55 MARKS 15. A State Archimedes principle . 1 mark b The figure shows a cube of side 2.0 m block and of mass 4,800 kg attached to the base of a tank containing paraffin of density 800 kgm-3 by means of an inextensible and light weight cable. Determine: i The density of the block. 2marks ii The upthrust acting on the block. 3 marks iii The tension in the cable. 2 marks iv The cable is then released, and the block rises to the surface where it subsequently floats. Calculate the fraction of the block which is beneath the surface of the paraffin. 2 marks 16. A Give two ways of increasing the boiling point of a liquid.


Explain. 2 marks ii A block of density 1.60 g cm3 and measures 3.0cm by 5.0cm by 7.0cm was placed on the ground. Determine the difference between the maximum and minimum pressure that would be exerted on the ground by the block. 3 marks b i State Newton s second law of motion 1 mark ii A wooden block resting on a horizontal bench is given an initial velocity U so that it slides on the bench for a distance X before it stops. Various values of X are measured for different value of the initial velocity. The figure below shows a graph of U2 against X. i Determine the slope S of the graph 3 marks ii Determine the value of k given that U2 20kX where k is a frictional constant for the surface 2marks iii State with a reason what happens to the value of k when the roughness of the bench surface is reduced 2 marks 19. A i State the kinetic theory of gases. 1 mark ii State the reason why it is easier to separate water into drops than to separate a solid into smaller pieces. 1mark b i State Hooke s law 1mark ii Two identical helical springs are connected in series. When a 50g mass is hang at the end of the springs, it produces an extension of 2.5 cm. Determine the extension produced by the same mass when the springs arc connected in parallel. 3marks c i State Boyle s law. 1mark ii Draw a suitable set up that can be used to verify Charles s law. 3marks 14U2 m2S2 X m www.freekcsepastpapers.comPage 87 MECS II CLUSTER EXAMINATION, 2023 Kenya Certificate of Secondary Education. 232 2 PHYSICS Paper 2 TIME: 2HRS Answer all the questions in sections A and B. SECTION A: 25MARKS 1. State one property of image formed by a pinhole camera. 1mk 2. Other than density, state another factor that affect the speed of sound in a solid. 1mk 3.


1mk 2. Other than density, state another factor that affect the speed of sound in a solid. 1mk 3. A radio wave has a frequency of 3MHz and travels with a velocity of 3.0 x108 m s. Calculate its wavelength. 2mks 4. Draw a circuit diagram to show P-N junction diode in the reverse biased mode. 2mks 5. Explain why the walls of studio are padded with woolen materials 1mk 6. A Define the term radioactivity 1mk b The figure below shows a radioactive element placed in an evacuated glass chamber. The element produces alpha, beta and gamma emissions. The three-emission pass through an electric field Complete the diagram to show the path of each of the emissions. 3mks 7. Explain why radio waves signals are easier to receive in a place surrounded by hills. 2mks 8. State two ways of minimizing electrical power losses during transmission of electric power. 2mks 9. Give a reason why convex mirror is preferred to a plane mirror for use as a driving mirror 1mk 10. State two ways of minimizing local action in a simple cell. 2mks 11. The figure below shows a defect of vision being corrected by concave lens placed infront of the eye. I Name the defect. 1mk ii Complete the rays to show the effect of the lens. 2mks 12. State one use of microwaves. 1mk 13. Determine the speed of light in water given that the speed of light in air is 3.0 x 108 m s and the refractive index of water is 1.33 3mks Radioactive element Glass chamber Lead box To vacuum pump Diverging lenswww.freekcsepastpapers.comPage 88 SECTION B 55 MARKS Answer all questions in this section. 14. A State the Ohm s law 1 mk b Give one factor that affect the resistance of a metallic conductor. 1mk c The figure below shows three resistors connected to 12V supply of internal resistance of 0.2 . Calculate i The effective resistance. 3mks ii The total current in the circuit.


1mk c The figure below shows three resistors connected to 12V supply of internal resistance of 0.2 . Calculate i The effective resistance. 3mks ii The total current in the circuit. 2 mks d i Define the term doping 1 mk ii Briefly explain how silicon is used to make an p-type semi-conductor. 3 mks iii State one application of a diode. 1mk 15. A Why is the cap of the gold leaf electroscope circular? 1mk b A match stick is lit near the cap of a charged electroscope. State and explain the observation made. 2mks c State one factor that affects the capacitance of a parallel plate capacitor. 1mk d A 10 F capacitor is charged to potential difference of 300V and isolated. It is then connected in parallel to a 5 F capacitor. Calculate: i The resultant potential difference. 3mks ii The total energy in the two capacitors after connection. 3mks 16. A State the Faraday s law of electromagnetic induction. 1mk b Give two factors that affect the magnitude of the induced em.f 2mks c A transformer with primary coil of 400 turns and secondary coil 200 turns is connected to 240 V a.c mains. I Calculate the secondary voltage. 2mks ii If the primary current is 3.0 A and secondary is 5.0A. Calculate the efficiency of the transformer. 3mks d State how the following are minimized in a transformer. 2mks i Hysteresis loss ii Eddy currents e Explain why the alternating voltage is used in a transformer. 1mk 17. A Define the term work function 1mk b Distinguish between thermionic emission and the photoelectric emission. 1mk c State one factor that determines the velocity of photoelectrons produced on the metal surface when light shine on it.


1mk 17. A Define the term work function 1mk b Distinguish between thermionic emission and the photoelectric emission. 1mk c State one factor that determines the velocity of photoelectrons produced on the metal surface when light shine on it. 1mk d The threshold wavelength of a photo emissive surface is 5.55x10-7 m. Take speed of light C 3.0x108 m s, Planck s constant h 6.63 x10-34 Js and mass of an electron Me 9.1x 10-31kg. Calculate: i Its threshold frequency 3mks ii The work function of the surface 3mks e The maximum speed with which a photoelectron is emitted if the frequency of the radiation is 6.2 x1014 Hz 3mks 2 3 4 12V r 0.2 www.freekcsepastpapers.comPage 89 18. A State one similarity between cathode rays and X-rays. 1mk b Give two uses of X-rays in medicine 2mks c In a T.V set magnetic fields are preferred for use as deflection system instead of the electric field. Explain 1mk d The figure below represents a cathode ray oscilloscope C.R.O . I Name the parts labelled A and C 2mks ii What is the function of part labelled D 1mk iii Explain how electrons are produced in the C.R.O. 1mk iv State the reason why the part labelled F has variable potential difference. 1mk v Give a reason why the tube is evacuated. 1mk A B C F G H 6V D Ewww.freekcsepastpapers.comPage 90 MECS II CLUSTER EXAMINATION, 2023 Kenya Certificate of Secondary Education. 232 3 PHYSICS PAPER 3 212 hours INSTRUCTIONS TO CANDIDATES a Answer ALL questions. B You are supposed to spend the first 15 minutes of the 212 allowed for this paper reading the whole paper carefully before commencing the work.


E Given that R r1 r2. Calculate R. 2mk f Given that , find the value of n. 3mks g Given that , find the value of k. 2mks h What Physical property does n represent? 1mk www.freekcsepastpapers.comPage 92 PART B g Measure 100 ml of hot water and pour it into the beaker. Place the beaker on the bench. Clamp the thermometer vertically and insert it into the beaker with hot water. H Start the stop-watch when the temperature is 800 C. Record the temperature, after 4 minutes. A .0C. 1mk Convert to in degrees Celsius to temperature T, in kelvin. B T ..K. 1mk i Find the mass, m in kg of water in the beaker given that the density of water is 1000kg m3. 2mks j Given that: where; m is the mass of the water used and the specific heat capacity of water, c 4200J kg K, determine the value of . 3mks k State the significance of . 1mks MECS II CLUSTER EXAMINATION, 2023 Kenya Certificate of Secondary Education.


2mks NsNp VsVp 400200 Vs240 Vs 400x240200 480V ii Power output 240x3 720W Efficiency power outputpower input x100 Power input 480x 5 2400W 7202400x100 30 d i Hysteresis loss - using a core of a soft magnetic material eg soft iron ii Eddy currents - laminating the core e It can be stepped up or stepped down. 17. A Minimum amount of energy of radiation light required to dislodge an electron from the surface of a metal b Thermionic emission is the process of emitting electrons from the metal surface due to heat energy while photoelectric effect is the process of emitting electrons from the metal surface by electromagnetic radiation of sufficient frequency energy. C Frequency wavelength energy of the radiation d i threshold frequency 3mks fo C O fo 3.0x1085.55x10 7 fo 5.405 x1014Hz ii The work function of the surface 3mks Wo hfo 6.63x10-34 x 5.405x1014 3.584 x10-19 J e hf hfo 2MeV2 6.63x10-34x6.2x1014 -3.584x10-19 5.266x10-20J 12MeV2 hf hfo V 5.266X10 20X29.1X10 31 3.402X105m s 18. A Both travel in straight line at the speed of light. B Sterilize surgical equipment Killing cancerous cells radiotherapy Radiography c Magnetic fields provide a wider deflection compared to electric fields. D i A-Cathode C-Grid ii Used for vertical deflection of the electron beam iii Thermionic emission-when the cathode is heated electrons on its surface gain enough energy to enable them break loose from the force of attraction from the nuclei. The filament heats up the cathode, causing the electrons to boil off or be emitted from surface. Iv To focus converge the electron beam on the screen. V To prevent electrons from losing energy due to collision with air particles.


Correct evaluation mk h Refractive index of glass 1mk PART B h a 68. 0 2.0 .0C. 1dp a must b T 273 68 341 ..K. i 1000 0.0001 0.1 kg j 0.1x4200 353 341 240 5040240 21 Js 1 k Rate of energy loss by water power loss by waterwww.freekcsepastpapers.comPage 63 A man pulls on the rope with a horizontal force T. The piece of metal has a weight of 2000 N and is freely pivoted at A. The system is in equilibrium. By taking moments about A, calculate the value of T. 3marks 6. Explain why an aeroplane is likely to take off much earlier than expected when the speed of the wind blowing in the opposite direction to its motion on the runway suddenly increases. 2 marks 7. An aircraft 300m from the ground traveling horizontally at 400m s releases a parcel. Calculate the horizontal distance covered by the parcel from the point of release. Ignore air resistance 3 mks 8. A body of mass 4.0kg held at a vertical height of 500cm is released to travel a long a frictionless curved path as shown in figure 8 Fig 8 The 4.0kg mass strikes another body of mass 6.0kg at rest. Immediately it reaches the horizontal, the two bodies stick together and move in the same direction. Determine the velocity of the bodies immediately after collision. 3marks 9. A tin with a hole is filled with water to a certain height. Water jets out as shown in figure 9 a below. A second identical tin is filled with water to the same height and a block of wood floated as shown in figure 9 b . Fig 9 State the reason why the maximum distance of jet d2 is greater than d1. 1 mark 10. The figure 2 below shows the apparatus used to observe Brownian motion using a smoke cell. I State the observation made in the smoke cell.


1 mark 10. The figure 2 below shows the apparatus used to observe Brownian motion using a smoke cell. I State the observation made in the smoke cell. 1 mark ii Explain the observation made when the temperature in the smoke cell is increased. 1 mark 11. When a mercury in a glass thermometer is used to measure the temperature of hot water, it is observed that the mercury level first drops before beginning to rise. Explain. 2 marks Mass 4.0kg Mass 6.0kg S Glass cover Microscope Air and smoke particleswww.freekcsepastpapers.comPage 64 12. Figure 3 shows an arrangement of apparatus to study properties of different surfaces. The heater is placed equidistant from the two plates. State what happens when the heater is switched on for some time. 1 mark 13. Explain your answer in question 12 above 1mark SECTION B: 55 marks 14. A The figure below shows the features of a refrigerator. I What is the function of the pump P? 1 mark ii What is the function of the copper fins at the back of the refrigerator? 1 mark iii Explain briefly how cooling takes place in the refrigerator. 3 marks iv What is the purpose of the double wall in a refrigerator? 1 mark b i Define the term latent heat of fusion of a substance. 1 mark ii The figure below shows an apparatus that could be used to determine the specific latent heat of fusion of ice. Fig 12 In order to obtain results that are as accurate as possible, state why it is important to: I. Wait until water is dripping into the beaker at constant rate before taking readings. 1 mark II. Use finely crushed ice rather than larger ones. 1 mark www.freekcsepastpapers.comPage 65 15. A State the law of flotation. 1 mark b Figure 13 below shows a uniform rod of height 8cm floating vertically in a beaker containing two immiscible liquids P and Q. The densities of the liquids are 800kg m and 1200kg m respectively the cross-sectional area of the rod is 2cm . Determine i . The weight of liquid P displaced by the rod.


The densities of the liquids are 800kg m and 1200kg m respectively the cross-sectional area of the rod is 2cm . Determine i . The weight of liquid P displaced by the rod. 3 marks ii The weight of liquid Q displaced by the rod. 2 marks iii The mass of the rod. 1 mark iv The density of the rod. 2 mks c Figure 14 below shows a block of volume 50 cm3 and density 2 000 kg m3 submerged in a liquid and suspended from a uniform horizontal beam by means of a thread. The beam is balanced by a spherical mass of 40 g, which is suspended from it on the other side of the pivot as shown. Fig 14 Determine the upthrust force acting on the block. 3 marks 16. A State two condition necessary for a driver to negotiate a bend on a banked road at a relatively high speed 2 marks b The figure shows stone of mass 100g whirled in a vertical circle using a thread of length 56cm. Take g 10N Kg www.freekcsepastpapers.comPage 66 If the stone is whirled at a speed of 8m s. Calculate; i The centripetal force experienced by the stone. 3 marks ii Tension force on the string at : I A 2 marks II B 2 marks iii calculate the angular velocity of the stone. 1mark d Figure 15 shows a centrifuge that is used to separate particles suspended in a liquid. Fig 15 Particle of different mass M1, M2 and M3 are suspended in a liquid which they do not dissolve. The system is then rotated in the direction shown. I State why the particles of different masses will acquire different radii as the system is rotated. 1 mark ii If M3 M2 M1, arrange the particle in increasing radii when the centrifuge is rotated for some time. 1 mark 17. A State one condition necessary for pressure law to hold. 1 mark b A bubble at the bottom of a pond expands as it rises to the top of the liquid. Explain. 1 mark c The graph below represents a graph of pressure against temperature, oC.


1 mark b A bubble at the bottom of a pond expands as it rises to the top of the liquid. Explain. 1 mark c The graph below represents a graph of pressure against temperature, oC. From the graph, determine; i The absolute zero temperature. 1 mark ii The pressure at 373K 1 mark Explain why temperature in i above cannot be achieved 2 marks 100 200 Temp oC Pressure 10 5pa1 2 3 4www.freekcsepastpapers.comPage 67 d A column of air 26cm long is trapped by mercury thread 5cm long. When the tube is inverted, the air column becomes 30cm long. What is the value of atmospheric pressure? 3 marks Explain using kinetic theory of gases why pressure of gases increases as temperature of the gas is increased. 3 marks 18. A Differentiate between work and energy. 2 marks b Describe the energy transformation that takes place when a car battery is used to light a bulb. 1 mark c The figure shows a machine. Gear wheel A with 30 teeth is driven by gear wheel B with 15 teeth. I Determine the velocity ratio of the machine. 2 marks ii If the machine has a mechanical advantage of 0.375, determine the efficiency of the machine. 2 marks d A cart of mass 30kg is pushed along horizontal path by a horizontal force of 8N and moves with a constant velocity. The force is then increased to 14N. Determine:; i The resistance to the motion of the cart. 1 mark ii The acceleration of the cart. 2 marks www.freekcsepastpapers.comPage 68 MURANGA SOUTH FORM 4 JOINT EVALUATION TEST, 2023 Kenya Certificate of Secondary Education K.C.S.E 232 2 PHYSICS PAPER 2 TIME: 2HRS INSTRUCTIONS TO CANDIDATES 1 Answer all questions in section A and B. 2 All workings must be clearly shown 3 Mathematical tables and non-programmable calculators may be used. SECTION A 1. The diagram below shows two steel pins held at the poles of two magnets. 2. The figure below shows an object in front of a plane mirror.


From the above graph, determine the reflective index of the liquid 3mks c The figure below shows a displacement time graph for a progressive wave i Determine the frequency of the wave 3mks ii Given that the velocity of the wave is 20m s determine its wavelength. 2mks 15. A The figure below shows a magnet being moved towards a stationery solenoid. It is observed that the pointers of the galvanometer deflect. I Give a reason for the deflection of the pointers of the galvanometer 1mk ii State two ways that can be used to increase the magnitude of the deflection of the pointer of the galvanometer 2mks Time seconds Displacement cm Apparent depth cm Real depth cm www.freekcsepastpapers.comPage 71 b The figure below shows a simple electric generator. 1 Name the parts labelled P and Q 2mks 2 The emf generated as the coil rotates is represented in the graph below. Give a reason for the changes in the emf as the coil rotates from 0 to 90 and 90 to 180. 2mk c The primary coil of the transformer has 1200 turns and the secondary coil has 60 turns. The transformer is connected to a 240V a.c source Determine i The output voltage 2mks ii The output current when the primary coil has a current of 0.5A. assume there are no energy losses 2mks 16. A State the differences between cathode rays and electromagnetic radiations 2mks b The figure below shows the main features of a cathode ray oscilloscope CRO i Name the parts labelled M and N 2mks ii State how electrons are produced in the tube 1mk iii When using CRO to display wave fronts of voltages. State where the following should be connected I. Voltage to be displayed on the screen. 1mk II. Time base voltage 1mk III. State why the tube is highly evacuated 1mk c An x ray tube operating at 12KV delivers a current of 8 mA per seconds.


1mk II. Time base voltage 1mk III. State why the tube is highly evacuated 1mk c An x ray tube operating at 12KV delivers a current of 8 mA per seconds. Calculate the number of electrons hitting the target per second Take 1.6 10 19 C 3mks. Emf V Angle of rotation 180o 360o Spot Fluorescent screen Heated filament Cathode Magnet Magnetwww.freekcsepastpapers.comPage 72 17. A State two ways of minimizing power losses during the transmission of electric Power 2mks b An electronic cooker is rated 2.5kw, 250v. State the meaning of these values 1mk c A consumer has the following appliances in the house Electronic iron rated 1500v A water heater rated 500w An electric cooker rated 2500w Three bulbs each rated 60w The house is filled with 12A fuse. Determine the resistance of the heating element used in the electric cooker 3mks d State how heating is achieved in a resistance wire 1mk e The lighting in a house has 20 lamps each rated 60w, 240 v. Determine the rating of the fuse that maybe used in the circuit. 4mks www.freekcsepastpapers.comPage 73 MURANGA SOUTH FORM 4 JOINT EVALUATION TEST, 2023 Kenya Certificate of Secondary Education K.C.S.E 232 3 PHYSICS Practical PAPER 3 CONFIDENTIAL INSTRUCTIONS TO SCHOOLS Question 1 Provide each candidate with the following apparatus. A metre rule A spring balance RANGE ABOVE 2.5 N A mass of 200g 2N with a hook or two 100g masses labelled M A complete retort stand Knife edge support at least 7 cm high Two light strings about 10cm long. QUESTION TWO A nichrome wire mounted on a millimetre scale labelled AB use a wire of diameter 0.36mm A galvanometer. Jockey A carbon resistor labelled X . 10 ohm carbon resistor 8 Connecting wires, 4 with crocodile clips at both ends.


A metre rule A spring balance RANGE ABOVE 2.5 N A mass of 200g 2N with a hook or two 100g masses labelled M A complete retort stand Knife edge support at least 7 cm high Two light strings about 10cm long. QUESTION TWO A nichrome wire mounted on a millimetre scale labelled AB use a wire of diameter 0.36mm A galvanometer. Jockey A carbon resistor labelled X . 10 ohm carbon resistor 8 Connecting wires, 4 with crocodile clips at both ends. A resistance wire labelled R mounted on a half meter rule use a wire of diameter 0.36mm fixed on half metre rule using cello tape. Ammeter range 0-1 Voltmeter range 0-5 or 0-2.5 One dry cell in a cell holder Micrometre screw gauge Soft board Vernier callipers. Rectangular Glass block of width 6.50 cm Four optical pins. Plain sheet of paper. Two thumb tacks Protractorwww.freekcsepastpapers.comPage 74 MURANGA SOUTH FORM 4 JOINT EVALUATION TEST, 2023 Kenya Certificate of Secondary Education K.C.S.E 232 3 PHYSICS PRACTICAL Paper 3 TIME 2 Hours INSTRUCTIONS TO CANDIDATES a Answer ALL the questions in the spaces provided in the question paper. B You are supposed to spend the first 15 minutes of the 2 hours allowed for this paper reading the whole paper carefully before commencing your work. C Marks are given for a clear record of the observations actually made, their suitability, accuracy and the use made of them. D Candidates are advised to record their observations as soon as they are made. E Non-programmable silent electronic calculators may be used. QUESTION 1 You are provided with the following: A metre rule A spring balance A mass M Stand Knife edge support. Two light strings about 10cm long. Proceed as follows: a Use the spring balance to determine weight of mass M N.


QUESTION 1 You are provided with the following: A metre rule A spring balance A mass M Stand Knife edge support. Two light strings about 10cm long. Proceed as follows: a Use the spring balance to determine weight of mass M N. 1mk b Using the string provided make two loops to be used as hooks L1 and L2 in the diagram. C Suspended the spring balance from a clamp and using one loop to support the rule from the spring so that the loop L2 is on 85cm mark. D Support the other end of the rule with a knife edge at the 10cm mark so that the rule is horizontal. E Using loop 1 suspended the mass M at a distance d 10cm from the knife edge as shown and take the reading of the spring balance, record the results in table 1. F Adjust the distance, d, to 20cm, 30cm e.t.c and each time recording the reading of the balance to complete the table. Table 1 Distance d cm 10.0 20.0 30.0 40.0 50.0 60.0 70.0 Distance d m Force N 3marks g Plot a graph of force F against distance d m 5 marks h From your graph determine: i The slope 3mks ii The value of F when d 0 2mks www.freekcsepastpapers.comPage 75 i Using the information from your graph, determine the constant k and n in the equation below and indicate their units, F 2nd 40k. I N 3mks ii K 3mks QUESTION 2 You are provide with the following - A nichrome wire mounted on a millimeter scale labelled AB - A galvanometer. -. Jockey - A carbon resistor labelled X. - 8 Connecting wires, 4 with crocodile clips at both ends. -. A resistance wire labelled R mounted on a half meter rule - Ammeter - Voltmeter - One dry cell in a cell holder - Micrometer screw gauge Proceed as follows: a Set up the circuit as shown below. I Record the voltmeter reading when the switch is open.


- 8 Connecting wires, 4 with crocodile clips at both ends. -. A resistance wire labelled R mounted on a half meter rule - Ammeter - Voltmeter - One dry cell in a cell holder - Micrometer screw gauge Proceed as follows: a Set up the circuit as shown below. I Record the voltmeter reading when the switch is open. E 1mark ii Close the switch and record the voltmeter and ammeter readings V and I. V 1mark I 1mark iii Explain why V is less than E. 1mark iv Now connect the voltmeter across the carbon resistor X and record voltmeter reading V1 when the switch is on. V1 . 1mark v Determine X given that X 1 1mark b Using the micrometre screw gauge, measure and record the diameter D of the resistance wire R provided D m 1mark c Now connect another circuit as shown in the figure below. Touch the 10cm mark and the 90 cm mark and see that the galvanometer deflects in opposite direction in each case. I Move the sliding jockey along the resistance wire AB and note the length L1 and L2 where the galvanometer pointer points at the zero mark. Record the values of L1 and L2. L1 m 1mark L2 m 1mark ii Determine the resistance of the resistance wire R using the relationship, 2marks G X L1 L2 10cm mark 90cm mark R B A AV Xwww.freekcsepastpapers.comPage 76 1 2 iii Determine the resistance of the wire R per metre. 1 mark iv Given that, R 0.1114 2 determine the value of S, where R is the resistance per metre. 3mark PART B You are provided with the following; - Soft board - Vernier callipers. -. Rectangular Glass block - Four optical pins. -. Plain sheet of paper.


3mark PART B You are provided with the following; - Soft board - Vernier callipers. -. Rectangular Glass block - Four optical pins. -. Plain sheet of paper. -. Two thumb tacks - Protractor Procedure; a Measure and record the width t of the glass block using the Vernier callipers provided. T m 1 mark b Fix the white plain paper on the soft board using the two thumb tacks. C Place the glass bock on the paper, trace its outline and label it ABCD, as shown. D Remove the glass block and draw a normal, say at point O. e Draw a line making an angle of 300 with the normal to represent the incident ray. F Replace the glass block carefully to its original position. G Fix two pins P1 and P2 on the line in such a way that they are vertical and at least 4cm apart. H Looking through the glass block through face AB, fix two pins P3 and P4 so that they are exactly in line with the P1 and P2. Mark the positions of P3 and P4 i Join P3 and P4 and produce the line to meet face AB of the block at O1. Join O and O1. Measure angle O1OP. Also, Measure angle OO1P. O1OP 1mark OO1P 1mark ii Measure the perpendicular distance d from the line O1N to OP produced. D m 1mark iii Determine t1 given that, t1 . 3marks iv How do the values of t and t1 compare?


2marks 4. Figure 3.0 shows a brick of mass 8.0kg standing upright on the ground as shown. 5. What is the pressure it exerts on the ground? G 10Nkg-1 3marks 0 10 5 A Soap film Wire frame Loop of threadwww.freekcsepastpapers.comPage 42 6. The figure 4.0 shows a rod made of wood on one end and metal on the other end suspended freely with a piece of thread so that it is in equilibrium. 7. State the relationship between Physics and Mathematics. 1mk 8. The diagram in fig 5.0 shows a section of a pipe with different cross-sectional area If water flows with a velocity of 10m s in section A, what would be the velocity of water in section? 3marks 9. Determine the spring constant of a spiral spring whose length changes from 10 cm to18 cm when a load of 10.0 N is suspended from its lower end. 3marks 10. Figure 6.0 below shows a wooden sphere with a nail hammered into it as shown. Y The sphere is rolled on a horizontal ground and comes to rest after sometime at point Y. Draw the sphere after it comes to rest at point Y. 1mark 11. When the temperature of an enclosed gas at constant pressure is raised, the volume of the gas increases. Explain how the molecules of the gas cause the increase in volume. 2marks 12. It is easier to stop a saloon car than a bus when both are moving with the same velocity. Explain. 2mrks 13. Figure7.0 a shows a displacement-time graph. Sketch a velocity-time graph on fig.7.0 b 1mk 14. State the law of conservation of energy. 1mk SECTION: 55 MARKS Answer all the questions in this section. 15. A Explain why it is advisable to use a pressure cooker at high altitude. 2marks b Water of mass 3.0 kg initially at 200C is heated in an electric kettle rated 3.0kW.


15. A Explain why it is advisable to use a pressure cooker at high altitude. 2marks b Water of mass 3.0 kg initially at 200C is heated in an electric kettle rated 3.0kW. The water is heated until it boils at 100oC take specific heat capacity of water 4200Jkg-1k-1, heat capacity of the kettle 450Jkg-1 and specific latent heat of vaporization of water 2.3MJkg-1. Determine: i The heat absorbed by the water. 2marks ii The heat absorbed by the electric kettle. 2marks iii The time taken for the water to boil. 2marks iv How much longer it will take to boil all the water. 3marks The side made of metal is heated with a Bunsen burner flame. State with a reason, the side to which the rod is likely to tilt. 2mks www.freekcsepastpapers.comPage 43 16. A Figure 8.0 shows the same block weighted in air, water and liquid. Given that the reading of the level of water becomes 150cm3 when the metal is fully immersed. Density of water 1000kgm 3 Determine the, i Density of the metal 3marks ii How would you determine the water level before the solid was immersed? 2marks iii Explain why the spring balance gives different reading in fig 8 ii and 8 iii with the same metal block. 2marks b Figure 9.0 below shows a simple hydrometer. I State the purpose of the lead shots in the glass bulb. 1mark ii How would the hydrometer be made more sensitive. 1mark c Figure10.0 shows a cork floating on water and held to the bottom of the beaker by a thin thread. Name the forces acting on the cork. 3marks 17. A When a bus goes around a bend on a flat road, it experiences a centripetal force.


State two changes that could be made to increase the strength of the electromagnet. 2 marks 5. I The diagram below shows a ferromagnetic material being magnetized by the method shown. Identify the polarity of P 1mk www.freekcsepastpapers.comPage 46 ii On the axes given below, sketch a graph to show how the strength of the magnet being created varies with the number of strokes. 1mk 6. A current of 13A flows through a heating element of resistance 8.5 for 1.5 minutes. Calculate the quantity of heat supplied. 3marks 7. Give a reason why it is not advisable to smoke a cigarette near a charging battery. 1mark 8. A soldier standing between two cliffs fires a gun. He hears the first echo after 2 seconds and the next after 5 seconds. Determine the distance between the two cliffs. Velocity of sound in Air 340m s 3mks 9. I Distinguish between transverse and longitudinal waves. 1 mark ii The figure below shows a wave profile. State the amplitude in SI units 1 mark 10. Two identical sphere A and B each standing on an insulated base are in contact. A negatively charged rod is brought near sphere A as shown below. In what way will A differ from B if separated while the rod is held close to A? 2mks 11. A student was investigating the brightness of bulbs when set up in circuits. He used identical bulbs and cells. He set up circuit A and B consisting of two bulbs and two cells as shown below. 12. A State one condition necessary for total internal reflection to occur 1mk b State one application of total internal reflection. 1mks Strength of magnet Number of strokes A B State and explain which set up had the bulbs brighter 2mks www.freekcsepastpapers.comPage 47 SECTION B 55 MARKS Answer ALL questions in this section. 13. A . On the axes provided, sketch a graph of capacitance against area of overlap of a parallel plate capacitor. 1 mark b i Draw a circuit diagram that may be used to investigate the discharging process of a capacitor.


A . On the axes provided, sketch a graph of capacitance against area of overlap of a parallel plate capacitor. 1 mark b i Draw a circuit diagram that may be used to investigate the discharging process of a capacitor. 2 marks ii On the axes provided sketch the graph of potential difference between the plates against time for discharging process. 1 mark c The figure below shows three capacitors connected to a 6V battery. Determine; i effective capacitance, 3 marks ii total charge stored, 3 marks iii potential difference across the 4 F capacitor 3 marks d Three resistors of resistances 2.0 , 4.0 and 6.0 are connected so as to obtain the least effective resistance. I Sketch an appropriate circuit diagram for the arrangement. 1 marks ii Determine the effective resistance of the circuit. 2 marks 14. A The figure below shows a human eye with a certain defect. I State one cause of this defect. 1 mark ii On the same diagram, sketch the appropriate lens to correct the defect and sketch rays to show the effect of the lens. 2 marks Time s Potential difference V Area of overlap m2 Capacitance F Retina Eyeball Rays from a distant object Imagewww.freekcsepastpapers.comPage 48 b The figure below shows a parabolic surface with a source of light placed at its focal point F. Draw rays to show reflection from the surface when rays from the source strike the surface at points A, B, C and D. 1 mark c State why convex mirrors are used in supermarkets to check shoplifters. 1 mark d The figure below shows a graph of V1 against U1 for a convex lens of unknown focal length. Use the graph to determine the average focal length ofof the lens, given that fff o When1f and 2fare the values of the focal lengths at of V1 andU1 intercepts respectively. 3 marks 15. A The figure below shows a simplified pin hole camera that was drawn to scale and the image of the object shown on the screen. Imagewww.freekcsepastpapers.comPage 49 The image formed was half the height of the object.


3 marks 15. A The figure below shows a simplified pin hole camera that was drawn to scale and the image of the object shown on the screen. Imagewww.freekcsepastpapers.comPage 49 The image formed was half the height of the object. I Complete the figure to show the object using a ray diagram. 4 marks ii State other two characteristics of the image. 2 marks iii State one effect on the image when; I. the pin hole was enlarged 1 mark II. The length of the camera was made shorter 1 mark III. The object was taken closer to the pin hole. 1 mark 16. A State the basic law of magnetism. 1 mark b Given a bar magnet, unmagnetised iron bar and a cotton thread; i describe a simple experiment that can be used to distinguish between a magnet and an iron bar. 4 marks ii State with reasons the observations that would be made in the experiment. 4 marks c While demagnetizing two bar magnets that were initially magnetized using electric current the number of identical pins that remained attracted by each magnet at different times was noted and a graph of the number of pins against time was obtained as shown in the figure below for the two magnets, P and Q, one from soft iron the other one steel. I With a reason, identify which graph represented soft iron 2 marks ii Use domain theory to explain demagnetization process. 2 marks 17. A Use the figure below to answer the questions that follows. I Show the direction of the current on the turns when the switch S is closed. 1marks ii State the polarity at P 1marks iii Explain using domain theory what happens on the soft iron bar. 1marks iv If a steel bar was used instead, what could be the difference? 1mark Time s www.freekcsepastpapers.comPage 50 b The following diagram shows a part of an electric D.C. motor. I On the diagram above show the direction of rotation of the coil. 1marks ii State the effect of increasing the number of turns of the rotating coil of an electric motor.


Motor. I On the diagram above show the direction of rotation of the coil. 1marks ii State the effect of increasing the number of turns of the rotating coil of an electric motor. 1marks c Sketch the magnetic field pattern around the conductor carrying current on figures a and b shown below. 2marks Fig a Fig bwww.freekcsepastpapers.comPage 51 MWAKICAN MJET FORM 4 JOINT EVALUATION TEST, 2023 Kenya Certificate of Secondary Education K.C.S.E 232 3 PHYSICS PAPER 3 Practical TIME: 2 HRS INSTRUCTIONS TO CANDIDATES 1. Answer all questions 2. All working must be clearly shown where necessary. 3. Non-programmable silent electronic calculation may be used. Question 1 You provided with the following - 35 paper clips - Optical pin from which the pendulum of a chain of paper clips may be suspended - 2 small pieces of wood or a cork to support the pin or the wire - A complete retort stand and clamp - A stop watch - Half metre rule Proceed as follows a Make a chain to consist of 10 paper clips ensuring that the links are all free to move. Make sure that the paper clips are all the same way up. Using the rule measure the length of one clip. ---------------------------------cm 1mk Set up the pendulum of the chain of paper clips as shown in figure below. B Keeping the chain straight, displace the bottom link of the chain through a small amplitude and release. When the chain swings smoothly in a vertical plane, time 20 oscillations and determine the periodic time T. Enter your results in the table below Number of links N Time for 20 Oscillations t Periodic time T T2 L m 10 15 20 25 30 35 9mks c Make up the chain of paper clips to be 15 links long. Measure and record the new time for 20 complete oscillation. D Repeat the procedure in c above by increasing the number of paper clips by 5 links each time to a maximum of 35 clips.


Enter your results in the table below Number of links N Time for 20 Oscillations t Periodic time T T2 L m 10 15 20 25 30 35 9mks c Make up the chain of paper clips to be 15 links long. Measure and record the new time for 20 complete oscillation. D Repeat the procedure in c above by increasing the number of paper clips by 5 links each time to a maximum of 35 clips. Enter your results in the table above and complete the values of T2www.freekcsepastpapers.comPage 52 e i On the grid provided, plot a graph of T2 against L 5mks ii Determine the slope of your graph. 3mks S ----------- iii Given that gS find the value of the acceleration due to gravity. 2mks Question 2 PART A 1. You are provided with the following; - One resistance wire mounted on a mm scale - Two dry cells - Switch K - A voltmeter - Three connecting wires with crocodile clips - 3 connecting wires a Set up the apparatus as shown in the diagram below Take off the crocodile clip from the wire AB and close the switch K. Record the reading E of the voltmeter E 1mk b Keeping the crocodile clip attached to the wire AB at a distance L 10cm from A record the reading V of the voltmeter in the table below. Repeat for other values of L shown in the table. Complete the table. 6mks Length L cm Voltage V E -V VEV 10 20 30 40 50 60 c Plot a graph ofVEV against L. 5mks d Determine the slope S, of the graph. 3mks www.freekcsepastpapers.comPage 53 PART B 1. Question one You are provided with the following - A candle - A lens and a lens holder - A screen - A meter rule a Set up the apparatus shown in the figure below. Ensure that the candle flame and the lens are approximately the same height above the bench.


3mks www.freekcsepastpapers.comPage 53 PART B 1. Question one You are provided with the following - A candle - A lens and a lens holder - A screen - A meter rule a Set up the apparatus shown in the figure below. Ensure that the candle flame and the lens are approximately the same height above the bench. B Set the position of the lens so that it is 0.3m from the candle u 0.3m . Adjust the position of the screen until a sharp image of the candle flame is obtained. Measure the distance V between the lens and the screen. Record the value of v in the table below. C Repeat the procedures in b above for the other values of u in the table 2mks U m 0.30 0.35 0.40 V m uvm d Given that 1 mVP Use the results in the table above to determine the average value of P. 3mks www.freekcsepastpapers.com Page 20 KAPSABET FORM FOUR EXAMINATION, 2023. Kenya Certificate of Secondary Education K.C.S.E 232 1 PHYSICS PAPER 1 THEORY TIME: 2 HOURS INSTRUCTIONS TO CANDIDATES Answer ALL the questions in section A and B. ALL answers and working MUST be clearly shown. Mathematical tables and electronic calculators may be used. Take acceleration due to gravity, g 10m s2 SECTION A 1. Figure 1 below shows a micrometer screw gauge being used to measure the diameter of a metal rod. The thimble scale has 50 divisions. Find the diameter of the metal rod. 1 mark 2. Explain briefly how the temperature in a green house is kept higher than outside. 2 marks The diagram shown in figure 2 below is an arrangement of three pulley wheels used to help in lifting loads. Use it to answer questions 3 and 4. Fig. 2 3. Complete the diagram to show how the rope goes round the wheels, position of the load and the effort. 2 marks 4. Write down the velocity ratio VR of the system. 1 mark 5. State how temperature affects the speed of sound in air. 1 mark 6.


1 mark 5. State how temperature affects the speed of sound in air. 1 mark 6. State two facts which show that heat from the sun does not reach the earth surface by convection. 2 marks 7. The diagram in figure 3 below shows water with negligible viscosity flowing steadily in a tube of different crosssection area. If at a point A, the cross section area is 120cm2 and the velocity of water is 0.40ms-1, calculate the velocity at B where cross section area is 4.0cm2? 3 marks Fig. 3 8. A motor uses an electrical energy at a rate of 200W and raises a mass of 25kg through a vertical distance of 20m in 0.5 minutes. Determine the efficiency of the motor. 3 marks 9. Name three types of forces that act between bodies not in contact. 3marks 10. How long will it take 240V, 3000W electric immersion heater to raise the temperature of 150 litres of water in a well-lagged calorimeter made of copper of mass 20kg from 150 to 700C? 3 marks Metal rod Fig. 1 B Awww.freekcsepastpapers.com Page 21 11. The diagram shown in the Figure 4 below shows a system in equilibrium with the rule horizontal. AB is a uniform rule of length 1.0m and weight 1.8N. Calculate the weight of the block X. 3 marks 12. State the reason why a trailer carrying heavy loads has many wheels. 1 mark SECTION B 55 MARKS Answer ALL the questions 13. A The figure 5 below shows the displacement time graph of the motion of particle. A State the nature of the motion of the particle between i A and B 1mk ii B and C 1mk iii C and D 1mk b A ball is thrown horizontally from top of a vertical tower and strikes the ground at a point 50 m from the bottom of the tower. Given that the height of the tower is 45m, determine the i Time taken by the ball to hit the ground.


A The figure 5 below shows the displacement time graph of the motion of particle. A State the nature of the motion of the particle between i A and B 1mk ii B and C 1mk iii C and D 1mk b A ball is thrown horizontally from top of a vertical tower and strikes the ground at a point 50 m from the bottom of the tower. Given that the height of the tower is 45m, determine the i Time taken by the ball to hit the ground. 2mks ii Initial horizontal velocity of the ball 2mks iii Vertical velocity of the ball just before striking the ground. 2mks Take acceleration due to gravity gas 10m s 14. A State the pressure law; 1 mark b Explain how a gas exerts pressure. 2 marks c The figure below shows a set up used to verify pressure law. 15StirrerThermometerHot waterGlassflaskDryairBourdon gauge i State the measurement that may be taken in the experiment. 2 marks ii Explain how the measurement in i above may be used to verify pressure law. 2 marks iii A car tyre is at pressure of 5.0x105 Pa at a temperature of 37 . While it is running the temperature rises to 75 . What is the new tyre pressure? Assume the tyre does not expand 3 marks www.freekcsepastpapers.com Page 22 15. A Distinguish between inelastic and elastic collisions. 2 marks b The diagram in Figure 6 below shows a sphere moving in a viscous liquid in a tall measuring cylinder. I Show on the diagram the forces acting on the sphere. 3 marks ii Sketch a graph showing the variation of velocity with time in figure 7 below. Show on the graph the terminal velocity, VT. 2 marks Time sec Velocity m s 16. A mass of 1kg is attached to a cord of length 50cm. It is whirled in a circle in a vertical plane at 10 revolutions per second as shown in the figure 8 below. A Find the tensions in the cord when the mass is at: i Highest point of the circle A.


A mass of 1kg is attached to a cord of length 50cm. It is whirled in a circle in a vertical plane at 10 revolutions per second as shown in the figure 8 below. A Find the tensions in the cord when the mass is at: i Highest point of the circle A. 2 marks ii Lowest point of the circle B. 2 marks b The diagram below shows a spring tied to an object, m, and rotated in a circular path of radius, r. i What provides the force that keeps the object moving in a circular path. 1 mark ii The speed of the object is constant but the body is accelerating. Explain. 1 mark Sphere Viscous liquidMeasuring cylinderwww.freekcsepastpapers.com Page 23 iii If the object is whirled faster, what would happen to spring balance reading? 1 mark iv Give a reason for your answers in b iii above. 1 mark v As the object is whirled round the string snaps and cuts off. Describe the subsequent path of the object. 1 mark 17. A State the law of floatation. 1 mark b Figure 9 shows a piece of cork held with a light thread attached to the bottom of a beaker. The beaker is filled with water. I Indicate and label on the diagram the forces acting on the cork. 1 mark ii Write an expression showing the relationship between the forces above. 1 mark c A solid displaces 8.5cm3 of liquid when floating in a certain liquid and 11.5cm3 when fully submerged in the same liquid. The density of the solid is 0.8g cm3. Determine:- i The upthrust on the solid when floating. 2 marks ii The density of the liquid. 2 marks iii The upthrust on the solid when fully submerged. 2 marks 18. The following results were obtained in an experiment to verify Hooke s law when a spring was extended by hanging various loads on it.


2 marks iii The upthrust on the solid when fully submerged. 2 marks 18. The following results were obtained in an experiment to verify Hooke s law when a spring was extended by hanging various loads on it. Load N 0.00 1.00 2.00 3.00 4.00 5.00 6.00 Length of spring in cm 10.00 11.50 13.00 14.50 16.00 18.00 24.00 Extension 0.00 I Complete the table for the extension e above. 2mk II Plot a graph of load y-axis against extension 5mks III From the graph determine the spring constant. 2mks IV Calculate the energy stored when the spring is stretched to 16 cm. 2mks www.freekcsepastpapers.com Page 24 KAPSABET FORM FOUR EXAMINATION, 2023. Kenya Certificate of Secondary Education K.C.S.E 232 2 PHYSICS PAPER 2 THEORY TIME: 2 HOURS Instructions to Candidates a Answer ALL the questions in sections A and B. b ALL working MUST be shown clearly c Mathematical tables and silent electronic calculators may be used. SECTION A 25 MARKS Answer ALL the questions in this section. 1. A Distinguish between real and virtual image 1mark b A pinhole camera forms an image of size 10cm. The object is 5m tall and 20m away from the pinhole. Find the length of the pinhole camera. 2marks 2. Why is it safer to carry explosive fuels in metal cans instead of plastic can? 1mark 3. The figure 1 below shows a cross section of a dry cell. Figure 1 i Name the part labeled A 1 mark ii State the use of manganese iv oxide in the cell 1 mark 4. A The figure 2 below shows a soft iron bar that s placed in a coil near a free suspended magnet. State and explain the observation made when the switch is closed. 2marks b Give a reason why attraction in magnetism is not regarded as a reliable method of testing for polarity. 1mark 5.


State and explain the observation made when the switch is closed. 2marks b Give a reason why attraction in magnetism is not regarded as a reliable method of testing for polarity. 1mark 5. Explain the term wavelength in terms longitudinal wave 1mark 6. A State the effect of pressure on the speed of sound in air. 1mark b A boy stands 190m from a high wall and claps his hands. If he hears an echo1.3 Seconds later, calculate the speed of sound in air. 2marks Awww.freekcsepastpapers.com Page 25 7. Figure 3 below shows an object, O placed 10 cm in front of a concave mirror whose radius, C is 40 cm. On the same figure, draw a ray diagram to show the position of the image formed. 3 marks 8. State any factor that determine the heating effect by an electric current. 1mark 9. Figure 4 shows the table of electromagnetic. Spectrum in the increasing order of wavelengths. P x-rays Q Infra-red a Identify the radiation marked Q 1mark b State the application of radiation marked P 1mark 10. Light travels from glass to air as shown in figure 5. The refractive index of glass 1.5 a Determine angle x 2marks 11. Figure 6 shows air molecules in front of a hollow, wooden box B set vibrating by a tuning fork. Figure 6 i State the reason of mounting the tuning fork on the box which is open at one end. 1mark ii What is the name given to this kind of wave? 1 mark 12. The figure 7 below shows an isolated negative charge placed closer to a negatively charged plate. Draw the electric field patterns. 1mark figure 7 13. Kenya launched the use of optical fibres in communication recently. State why optical fibres are preferred to ordinary cables 1mark X 0 Air Glass n 5 Tuning fork Y Zwww.freekcsepastpapers.com Page 26 SECTION B 55 MARKS 14.


1mark figure 7 13. Kenya launched the use of optical fibres in communication recently. State why optical fibres are preferred to ordinary cables 1mark X 0 Air Glass n 5 Tuning fork Y Zwww.freekcsepastpapers.com Page 26 SECTION B 55 MARKS 14. A State two ways in which the speed of rotation of a motor can be increased 2marks b The figure 8 below shows a simple electric bell circuit i Name the parts label X and Y 2marks ii When the switch is closed, the hammer hits the gong repeatedly. Explain why: I The hammer hits the gong. 2marks II The hammer hits the gong repeatedly 2marks iii If the armature is made of steel metal, it is observed that the bell will take longer to ring. Explain this observation. 1 mark iv Name two adjustment should be done to the system to make it operate effectively with a lower voltage battery? 2mark 15. A In an experiment to determine the internal resistance of a cell, the following circuit was used. It was noted that when S is open, the voltmeter reads 1.5V and when S is closed the voltmeter reads 1.3V and ammeter reads 0.2A. i Define the term e.m.f of the cell. 1mark ii Determine the lost voltage. 1mark iii Determine the value of R. 2marks iv Determine the internal resistance of the cell. 3marks b Study the circuit below and answer the questions that follow. I Determine the effective resistance of the circuit. 3marks ii Determine the p.d between X and Y. 2marks www.freekcsepastpapers.com Page 27 16. A i Define capacitance of capacitor 1mark ii A positively charged rod with a pointed end is brought near a candle flame as shown fig. 9. Explain why the flame burns in the direction shown 1mark b One of the factors which affect the capacitance of a parallel plate capacitor is the area of overlap of the plates. Name two other factors. 2marks c Calculate the effective capacitance of the capacitors shown across points X and Y.


Explain why the flame burns in the direction shown 1mark b One of the factors which affect the capacitance of a parallel plate capacitor is the area of overlap of the plates. Name two other factors. 2marks c Calculate the effective capacitance of the capacitors shown across points X and Y. 3marks d A capacitor was full charged to a potential of 40v. The capacitor is connected as shown in the figure below to discharge at load resistor R. Sketch a graph to show how the capacitor discharges with time 2marks 17. A Water waves from a given source move from a deeper a shallow to end. What effect would this have on the; i Frequency 1mark ii Wavelength 1mark iii Velocity of the wave 1mark b . The figure 10 shows wave fronts approaching a wide opening i Complete the diagram to show the appearance of the wave fronts after crossing the opening. 2mark ii State what would be observed on the pattern if the gap was made smaller 1mark c Figure 11 below shows light rays from two coherent sources S1 and S2 falling on screen. Dark and bright fringes are observed between A and B i State the function of S1 and S2 1mark ii State how I. Bright fringes are formed 1mk II. Dark fringes are formed 1mark www.freekcsepastpapers.com Page 28 c . Figure 12 below shows plane water waves incident on a plane reflector placed at an angle to the path of the waves. Complete the diagram to show the reflected waves 2marks 18. A Define the term principal focus for in converging lens 1mark b Sketch on a diagram to illustrate how a convex lens is used as a magnifying glass. 3 marks c In an experiment to determine the focal length of a converging lens using lens formula, several values of image distance corresponding to value of object distance u were determined and a graph of magnification m against image distance v, plotted as shown in Figure 13 The equation of the graph can be represented by the equation m -1 i State the significance of the gradient of the graph 1mark ii From the graph, determine the focal length of the lens.


Complete the diagram to show the reflected waves 2marks 18. A Define the term principal focus for in converging lens 1mark b Sketch on a diagram to illustrate how a convex lens is used as a magnifying glass. 3 marks c In an experiment to determine the focal length of a converging lens using lens formula, several values of image distance corresponding to value of object distance u were determined and a graph of magnification m against image distance v, plotted as shown in Figure 13 The equation of the graph can be represented by the equation m -1 i State the significance of the gradient of the graph 1mark ii From the graph, determine the focal length of the lens. 3marks iii Determine the value of object distance for which the image is not magnified. 1mark iv An object of height 10.5cm stands before a diverging lens of focal length 20cm and a distance of 10cm from the lens. Determine the image distance. 3 marks www.freekcsepastpapers.com Page 29 KAPSABET FORM FOUR EXAMINATION, 2023.


1mark iv An object of height 10.5cm stands before a diverging lens of focal length 20cm and a distance of 10cm from the lens. Determine the image distance. 3 marks www.freekcsepastpapers.com Page 29 KAPSABET FORM FOUR EXAMINATION, 2023. Kenya Certificate of Secondary Education K.C.S.E 232 3 PHYSICS PAPER 3 PRACTICAL CONFIDENTIAL INSTRUCTIONS TO SCHOOLS QUESTION ONE Every student should be provided with the following: - A lens holder - Convex lens of focal length 15.0 cm 1cm - A candle - A white screen - A metre rule - A Equilateral triangular glass prism of side 3.7cm - A plain sheet of paper - A soft board - 4optical pins thumbs - 4 paper pins - A watch glass of diameter 10.0cm 1cm - A piece of plasticine about 20g - A marble of diameter 1.60 cm 0.50cm - A Stopwatch-An electronic balance to be shared - Vernier calipers to be shared - Geometrical set QUESTION TWO - An ammeter 0 1 A - A voltmeter 0 3 V or 0 5 V - A variable resistor of 100 - A 10 carbon resistor - A piece of resistance wire SWG 30 50cm long - Two New Size D dry cells - A cell holder - A switch - Seven connecting wires of 4 should have crocodile clips both ends and 3 with crocodile clip on one endwww.freekcsepastpapers.com Page 30 Figure 1 KAPSABET FORM FOUR EXAMINATION, 2023. Kenya Certificate of Secondary Education K.C.S.E 232 3 PHYSICS PAPER 3 PRACTICAL 2 hours INSTRUCTIONS TO CANDIDATES 1. Answer all questions. 2. Non-programmable calculators and mathematical tables may be used. 3. Show all your workings.


Complete Table 3 3marks Table 3 ii Given that the focal length f of the lens satisfies the equation f 1, determine the average value of the focal length, f. 2 marks QUESTION 2 You are provided with the following: - An ammeter 0 1 A - A voltmeter 0 3 V or 0 5 V - A variable resistor - A 10 carbon resistor - A piece of resistance wire - Two new dry cells - A cell holder - A switch - Seven connecting wires u cm v cm m 30 50 Figure 4www.freekcsepastpapers.com Page 33 Proceed as follows: a Take the resistant wire and coil it around the biro pen to make a coil. B Set up the apparatus as shown Figure 5 below such that the 10 carbon resistor and the coil are in parallel connection. C Close the switch and the adjust the variable resistor such that the ammeter read a current of I1 0.08A and record the corresponding voltmeter reading V1 i V1 1mark ii Calculate resistance VR I 1mark d Repeat c above for current of I2 0.16A and record the corresponding voltmeter reading V2 i V2 1mark ii Calculate resistance VR I 1mark e Find the average value of resistance R 1mark f Determine the resistance, C of the coil 2marks g Now set up the apparatus as shown in Figure 6 below such that the voltmeter is connected across the cells, 10 carbon resistor and the coil are in parallel connection. H Close the switch and the adjust the variable resistor such that the ammeter reads a current of 0.04A and note the corresponding voltmeter reading. Record the value in the Table 4 below.


A force of 0.6N pulls the block so that it moves with a constant acceleration of 1m s2. Calculate i the time it takes to travel a distance of 200m. 2mks ii the friction force between the block and the table. 2mks 18. The sphere below has a volume of 0.1 litres. It is held with a tight string at the base with of its volume in liquid A of density 380kg m3 while the rest is in Liquid B of density 700kg m3. The tension of the string is 0.32N. A O B Stone A C B 10cm A B Find: a Mass of liquid A displaced. 2mks b Mass of liquid B displaced. 2mks c Upthrust experienced by the sphere. 2mks d Mass of the sphere 2mks e Density of the sphere 2mks www.freekcsepastpapers.com4 KIRINYAGA WEST SCHOOL BASED EXAMINATION, 2023 Kenya Certificate of Secondary Education 232 2 PHYSICS PAPER 2 THEORY 2 HOURS Instructions to candidates: a Answer ALL the questions in Section A and B. b All workings must be clearly shown. C Non-programmable silent electronic calculators and KNEC Mathematical tables may be used. SECTION A: 25 MARKS 1. A Figure 1 shows three cardboards; X, Y and Z with holes in positions shown. A bright source of light is placed before cardboard X and an observer observes behind the hole in cardboard Z. State the property of light being investigated in the experiment. 1mk b Figure 2 shows a ray of light incident on a plane mirror striking the reflecting surface as shown. Complete the diagram indicating the value of angle of reflection. 2mks 2. A glass rod is rubbed against a piece of nylon cloth. A State the type of charges acquired by the glass rod. 1mk b Explain how the charges in i above are acquired. 1mk 3. A battery of four cells connected in series produces an emf of 4.8V. Determine the emf of a battery of five such cells. 1mk 4.


A battery of four cells connected in series produces an emf of 4.8V. Determine the emf of a battery of five such cells. 1mk 4. Figure 3 shows a bar magnet AB suspended by a thread. When the North pole of hand held bar magnet is brought close to end B, there is repulsion. State with a reason the observation made when a South pole of another hand-held magnet is brought near end A. 2mks www.freekcsepastpapers.com5 5. Figure 4 shows a vertical object, O, placed in front of a convex mirror whose principal focus, F and centre of curvature, C are shown. 6. Figure 5 shows a small electromagnet used for lifting and releasing a small steel ball. Figure 5 a State why soft iron is preferably used in the core compared to steel. 1mk b The electromagnet is required to lift a slightly heavier steel ball. State one adjustment that should be made on the electromagnet. 1mk 7. A vibrator is producing 16 ripples per second across some water surface. Each two consecutive crests of the ripples are 5cm apart. Determine the velocity of the ripples. 2mks 8. A Explain the effect of wind on the speed of sound. 1mk b State the reason why, the inside walls of concert halls auditorium are covered with soft materials. 1mk 9. A State one observation made on water wave as it moves from a shallower region to a deeper region on an oblique boundary. 1mk b In young s double slit experiment, what does the bright fringes on the screen represent. 1mk 9. Figure 6 shows two 2 resistors and a 3 resistor connected to a battery as shown. Figure 6 Determine the ammeter reading assuming the battery has negligible internal resistance. 2mks 11. An electric heater rated 1800W, 240V is connected to a 240V mains supply through a fuse rated 5A. Determine whether the fuse is suitable for the heater. 2mks 12. A State one similarity between the working of the human eye and the camera. 1mk b State one possible cause of short sight. 1mk 13.


A State one similarity between the working of the human eye and the camera. 1mk b State one possible cause of short sight. 1mk 13. Arrange the following electromagnetic waves in order of decreasing frequency. Red light, X-rays, Infrared, radio waves. 1mk Draw a ray diagram showing how the image is formed. 2mks Soft iron core Steel ballwww.freekcsepastpapers.com6 SECTION B- 55 Marks 14. A Figure 7 shows two circuits placed close to each other. Figure 7 When the switch is closed, the pointer in the galvanometer shows some deflection and returns to zero. When the switch is opened, the galvanometer pointer deflects in the opposite direction and return to zero. Explain. 3mks b State the energy losses minimized by the following. I Wounding over the secondary coil over the primary coils. 1mk ii Using thin sheets of insulated soft iron plates laminating the core 1mk c Figure 8 shoes a simple generator producing 48W at 12V a.c. The power is then fed in to a step up transformer as shown. An a.c voltage is also connected to the secondary coil. Figure 8 Determine i The current in the primary coils of the transformer. 2 mks ii The voltage reading. Hint count the number of turns in each coil. 3mks d Figure 9 shows an electric iron box connected to the main supply. Three wires, live, Y and Z are the main wires. Figure 9 i State the colour code of wire Y. 1mk ii Identify one error in the wiring circuit. 1mk 15. A In the X-ray tube, state: i the reason why tungsten is suitable for use in the target. 1mk ii the adjustment made to produce X-rays with a higher penetrating power, 1mk iii The part s which facilitate efficient cooling of the anode. 1mk b Figure 10 shows some parts of a cathode ray oscilloscope. C.R.O i Explain how the electrons are produced in the tube. 2mks ii State the function of part C1.


1mk b Figure 10 shows some parts of a cathode ray oscilloscope. C.R.O i Explain how the electrons are produced in the tube. 2mks ii State the function of part C1. 1mk www.freekcsepastpapers.com7 iii Give the collective name for parts A, B, C1 and C2 1mk c Figure 11 shows the output signal on a C.R.O when an a.c signal is connected to the Y-plates when the time base is set at 80ms cm. Figure 11 Determine i the frequency of the signal. 2mks ii the peak to peak voltage if the Y-Gain is 2.5V cm. 2mks 16. A Figure 12 shows a circuit consisting of two neutral metallic plates X and Y connected in series to a battery and a microammeter. Figure 12 i It is observed that when some ultraviolet irradiated on the metallic plate Y, the micro ammeter deflects. Explain. 2mks ii State the observation made when the intensity of the ultraviolet radiation is increased. 1mk iii It is observed that when infrared radiation is irradiated on the same metallic plate; the galvanometer does not deflect no matter the intensity. 2mks b Light of wavelength 4.25 x 10-7m is incident on two metal surfaces, A and B. Given that - The speed of light, C 3.0 x 108m s Mass of an electron - Plancks constant, h 6.62 x 10 -34 Js Me 9.11 x 10 31Kg - Charge of an electron, e 1.6 x 10-19 C eV 1.6 x 10-19 J i Determine the energy of the incident radiation: I in Joules 2mks II in eV 2mks ii If the work function of metal A is 1.8 x 10-19 J, determine the speed of the photoelectrons from the metal surface A. 3mks 17. A State one factor that affect the capacitance of a parallel plate capacitor. 1mk b Figure 13 shows a positive point charge placed close to a negatively charged plate.


All working must be clearly shown. Non programmable silent electronic calculators and KNEC mathematical tables may be used. Question 1 A You are provided with the following apparatus: Concave mirror and a holder Metre rule Candle about 7cm White screen a i Determine the focal length of the mirror by focusing a distant object. 1mk f0 .cm ii Arrange the apparatus as shown in the figure 1 below. Iii Place the candle at distance f0 L Say f0 4cm from the mirror. Iv Starting with the screen at a distance of 100cm from the mirror, gently move it towards the mirror until a sharp inverted image is formed. V Measure and record the distance x, vi Repeat step iii-v for the other values of L and record your results in table 1. Complete the table. 4 marks Table 1 L cm 4 5 6 7 8 9 10 x cm 1 L cm-1 b Plot a graph of x against 1 L 5mks c Find the slope S of the graph. 3mks d Given that kLfx2 determine f from your graph. 2mks e What does f represent? 1mk www.freekcsepastpapers.com11 Question 1B You are provided with the following; Metre rule Complete stand A spring with a pointer One 50g mass labeled M. Stop watch Proceed as follows; a Set up the apparatus as shown; Fig. 2 b Hang the unloaded spring so that the pointer is at X0 such that X0 is 0.3m c i Load a mass of 50g and determine the extension of the spring. E1 cm 1mk e1 m 1mk ii Displace the 50g mass slightly downwards and release it to oscillate vertically. Time 20 oscillations and obtain t1. T1 ..s 1mk iii Find the periodic time T1. T1 ..s 1mk iv Use the equation pe2T to find the value of P1.


Time 20 oscillations and obtain t1.t1 ..s 1mk iii Find the periodic time T1.T1 ..s 1mk iv Use the equation pe2T to find the value of P1. 3mks Question 2 You are provided with the following. A micrometer screw gauge to be shared Nichrome wire mounted on a mm scale labeled AB A voltmeter 0-3V or 0-5V Ammeter 0-1A A switch A jockey long wire with crocodile clip attached. Two new dry cells and cell holder. 8 connecting wires with crocodile clips attached to one end.