KCSE PHYSICS PAPER SECTION A (25 marks) Answer all the questions in this section in the spaces provided.

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1 KCSE PHYSICS PAPER SECTION A (25 marks) Answer all the questions in this section in the spaces provided. 1. Figure 1 shows part of the main scale and vernier scale of a vernier callipers. Record the reading indicated. Figure 1 2. State one factor that affects the turning effect of a force on a body. 3. Figure 2 shows some air trapped by mercury in a glass tube. The tube is inverted in a dish containing mercury. Given that the atmospheric pressure is 760 mmhg and the height of mercury column in the tube is 600 mm, determine the pressure of the air trapped in the tube in -mmhg. (3 marks)

2 4. An object of weight 20 N attached at the end of a spring causes an extension of 0.5 cm on the spring. (a) Determine the spring constant of.the spring. (b) Determine the weight of an object that would cause an extension of 0.86 cm when attached at the end of the same spring. 5. State two measurements you would take in an experiment to determine the upthrust of an object which is immersed in a fluid. 6. State how the measurements in question (5) are used to determine the upthrust of the object. 7. Figure 3 shows a piece of wood fitted into a copper pipe and a piece of paper wrapped tightly around me junction. It is observed that when a flame is applied around the paper at the junction, the side of the paper around the wood burns first. Explain this observation.

3 8. Figure 4 shows a uniform metre rule of weight IN with two weights of 0.18 N and 0.12 N suspended from its ends. Determine how far from the 0.18 N weight a pivot should be placed in order to balance the meter rule. (3 marks) 9. Explain why brakes fail in a hydraulic braking system when air gets into the system. 10. Figure 5 shows a Bunsen burner. Figure 5 Explain how air is drawn into the burner when the gas tap is open. (3 marks)

4 11. Figure 6 (a) and 6(b) show capillary tubes inserted in water and mercury respectively. It is observed that in water the meniscus in the capillary tube is higher than the meniscus in the beaker, while in mercury the meniscus in the capillary tube is lower than the meniscus in the beaker. Explain these observations. 12. State why it is necessary to leave an air space in a closed glass bottle of water when it.is to be kept in a refrigerator. 13. A drop of blue ink is introduced at the bottom of a beaker containing water. It is observed that after some time, all the water in the beaker turns blue. Name the process that takes place.

5 SECTION B (55 marks). Answer all the questions in this section in the spaces provided. 14. (a) State two ways in which the centripetal force on a body of mass m can be increased (b) Figure 7 shows an object at the end of a light spring balance connected to a peg using a string. The object is moving in a circular path on a smooth horizontal table with a constant speed. (i) State what provides the centripetal force. (ii) (iii) Indicate with an arrow on the figure the direction of the centripetal force. State a reason why the object is accelerating while its speed remains constant. (iv) Given that the mass of the object is 0.5 kg and it is moving at a speed of 8 ms -1 at a radius of 2 m, determine the reading on the spring balance. (3 marks) (c) A stone thrown vertically upwards reaches a height of 100 m. Determine the: (i) initial velocity of the stone. (Neglect air resistance and take g = 10 ms ~2 ) (ii) total time the stone is in air.

6 15 (a) State the meaning of the term "specific latent heat of fusion". (b) Figure 8 shows a set up of apparatus used in ati experiment to determine the specific latent heat of fusion of ice. The following readings were noted after the heater was switched on for 5 minutes: - mass of beaker = 130 g - mass of beaker + melted ice = 190 g (i) Determine the: (I) energy supplied by the 60 W heater in the 5 minutes. (3 marks (II) specific latent heat of fusion of ice. (4 marks) (ii) It was observed that some of the crushed ice melted even before the heater was switched on. State a reason for this observation,

7 16 (a) A horizontal force of 12 N is applied on a wooden block of mass 2 kg placed on a horizontal surface. It causes the block to accelerate at 5 ms -2. Determine the frictional force between the block and the surface. (3 marks) (b) Figure 9 shows a graph of velocity against time for a ball bearing released at the surface of viscous liquid. Explain the motion of the ball bearing for parts (i) OA (ii) AB (c) Figure 10 shows a pulley system used to raise a load by applying an effort of 500 N.

8 State the: (i) velocity ratio of the system. (ii) purpose of pulley 2. (iii) Given that the machine has an efficiency of 80%, determine the maximum load that can be raised. (3 marks) 17. Figure 11 shows an insulated cylinder fitted with a pressure gauge, a heating coil and a frictionless piston of cross-sectional area 100 cm 2. (a) While the piston is at position O, the pressure of the enclosed gas is 10 Ncm" 2 at a temperature of 27 C. When a 10 kg mass is placed on the piston, it comes to rest at position A without change in the temperature of the gas. (i) Determine the new reading on the pressure gauge. (4 marks) (ii) State with a reason how the value obtained in (i) compares with the initial pressure. (b) The gas is now heated by the heating coil so that the piston moves back to the original position O. (i) State the reading on the pressure gauge.

9 (ii) Determine the temperature of the gas in C. (4 marks) Take g= 10Nkg -1 ). 18. (a) Figure 12 shows a weighing balance on which a beaker containing some water is placed. The reading on the balance is 2.80 N. A metal block weighing 2.7 N is suspended from a spring balance (i) State what is observed on the spring balance and the weighing balance, as the metal block is gradually lowered into the water. (I) Observation on spring balance, (II) Observation on weighing balance. (ii) Explain the observation made on the spring balance in (I).

10 (iii) When the metal block is fully immersed in the water, the reading on the spring balance is found to be 2.46 N. Determine the: (I) reading on the weighing balance. (II) density of the metal. (3 marks) (c) Figure 13 shows a hydrometer with a thin stem floating in water in a beaker. State with a reason what is observed on the hydrometer when the temperature of the water is raised.

11 PHYSICS PAPER 2 SECTION A (25 marks) Answer all the questions in this section. 1. State the reason why when a ray of light strikes a mirror at 90, the reflected ray travels along the same path as the incident ray.. 2. Explain why the image formed in a pin hole camera gets blurred when the hole is enlarged State the reason why the magnetic field strength of a magnet is greatest at the poles. 4. Figure 1 shows a cell of e.m.f. 2 V connected in series with a resistor R and a switch Voltmeters V 1 and V 2 are connected across the cell and the resistor respectively. (a) State the reading of V 1 with S open. (b) With S closed V 1 reads 1.6 V. State the reading of V 2 5. Figure 2 shows the image of an object formed by reflection in a converging mirror. C is the centre of curvature of the mirror. Complete the diagram to show: (a) How incident rays are reflected to form the image ; (b) The object position.

12 6. Figure 3 shows a ray of light passing into a glass prism ABC. Sketch the path of the ray as it travels from face AC. (critical angle for glass is 42 ) 7. The equation below represents a nuclear reaction in which two deuterium nuclei fuse to form Helium and X. (a) Determine the values of a and b. (b) Identify X. 8. Figure 4 shows a simple transformer connected to a 12 V a.c. source and an a.c.volmeter. By counting the number of turns in each coil, determine the reading on the voltmeter (3 mks)

13 9. In domestic wiring systems lamps in the lighting circuit are required to be in parallel and not in series. State two reasons for this requirement. 10. Figure 5 shows a narrow beam of x-rays passing between two metal plates in air. The plates are connected in series with a switch, a cell and a milliameter. It is observed that when the switch is closed a current flows in the milliameter. Explain this observation. 11. Explain the fact that radiant heat from the sun penetrates a glass sheet while radiant heat from burning wood is cut off by the glass sheet A proton of ultraviolet light having energy E falls on a photoemissive surface whose work function is T. Write an expression for the maximum kinetic energy of the resulting photoelectron in terms of E and T When a germanium crystal is doped with arsenic, it becomes an N-type semiconductor. Explain How this change occurs. (Number of electrons in the outermost shell for germanium = 4, Arsenic = 5)

14 SECTION B(55marks) Answer all the questions in this section. 14. Figure 6 shows two convex lences Aand B used to produce a magnified virtual image of an object (a) Determine the focal length of lens A. (Take l unit to represent 10cm). b) State the function of: (i) lens A 1 mark) ii) lens B (c) State how the functions in (b) are achieved by: i) lens A (ii) lens.. (d) Determine the magnification produced by: (i) lens A;.. (ii) the whole system.

15 15. (a) Explain how a positively charged electroscope gets discharged when the cap is touched with a finger. (b) Figure 7 shows capacitors A and B connected in series with a battery of e.m.f 4 V. Determine: (i) the effective capacitance of the circuit. (3 marks) (ii) the quantity of charge in capacitor A. (3 marks) (iii) the quantity of charge in capacitor B. c) Figure 8 shows an isolated negative point charge Q Figure 8 On the figure, sketch the electric field pattern around the charge. 16 (a) Two points A and B have a potential difference of V volts. Q coulombs of charge flow between A and B for t seconds. Determine: (i) the electrical energy transformed between the two points in terms of Q. (ii) the power transformed in terms of Q and t. (iii) show that the power transformed is given by P = IV.

16 (b) The lighting circuit in a house has 20 lamps each rated 60 W, 240 V. Determine whether a fuse rated 4 A can be used in the circuit when all the lamps are put on. (4 marks). 17 (a) Figure 9 shows a cathode ray tube in which a beam of electrons is cast on the screen. Figure 9 (i) state how the electrons are produced in the tube. (ii) state how the electron beam is detected... (iii) State the reason for having a variable potential difference (p.d.) at the: (I) grid;. (II) anodes.

17 (b) Figure 10 shows the waveform of a signal applied at the y-plates of an oscilloscope whose time-base is switched to the scale of 2 milliseconds per centimeter. Determine: (i) the period of the signal;.. (ii) the frequency of the signal. (3 marks) a) Figure 11 shows plane light waves in air incident on a convex lens whose principal focus is F, the waves move past point G. F G Figure 11 Complete the diagram to show the pattern of the emergent waves between the lens and point G.

18 (b) Figure 12 shows crests of circular water waves spreading from two points A and B due to a vibrator. C and D are points on the surface of the water. Given that the amplitude of each wave is 5 cm, state with a reason the amplitudes of the waves at point: (i) C:. (ii) D. (2 marks.. (c) Figure 13 shows a standing wave formed when a string of length 1.5 m stretched between two supports is plucked in the middle. (i) Explain how the standing wave is formed. 3mks). (ii) Determine the wavelength of the standing wave. ( 1mk)

19 19.(a) Figure 14 shows an E shaped steel block being magnetised by a current through two coils in series. On the figure, indicate (i) the north and south poles of the resulting magnet (ii) the complete magnetic field pattern between the poles. (b) Figure 15 shows the permanent magnet made in part (a) above. A coil wound loosely on the middle limb connected in series with a low voltage a.c is and a switch. State and explain the observation made on the coil when the switch is closed.

20 c). In a simple cell, the zinc plate gets negatively charged and the copper plate gets positively charged. (i) Name the electrolyte in the cell. (ii) Explain how: (I) Zinc gets negatively charged. (II) Copper gets positively charged (iii) State what constitutes the current when a wire is used to connect the zinc plate and the copper plate externally.

Answer all the questions in this section in the spaces provided.

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