SECTION Question Maximum score Candidate s score

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1 NAME..INDEXNo../ ADM. 232/1 PHYSIC S Paper 1 (THEORY) JULY/AUGUST Hours SUBUKIA SUB-COUNTY JOINT EXAMINATION KENYA EXAMINATION OF SECONDARY EDUCATION (K.C.S.E) INSTRUCTIONS TO CANDIDATES Student s signature Date 1. Write your NAME, INDEX NUMBER and ADM NUMBER in the spaces provided above. 2. Sign and write the date of examination in the spaces provided above. 3. This paper consists of three sections: A and B 4. Answer ALL questions in sections A and B. 5. Answers to all questions must be in the spaces provided. 6. Candidates should check the question paper to ascertain that all the pages are printed as indicated and that no questions are missing 7. Take g =10m/s 2 For examiner s use only SECTION Question Maximum score Candidate s score A B TOTAL SCORE 80

2 This paper consists of twelve (12) printed pages. SECTION A (25MARKS) Answer all questions in this section in the spaces provided 1. A spherical ball bearing was held between the anvil and the spindle of a micrometer screw gauge the readings with the ball bearing in position is shown in diagram below. Determine its diameter (1mk).. 2. The ball bearing was then weighed and its mass was found to be 5 g. Calculate its density and give the answer in SI units (3mks) 3. The figure below shows a soap film in a loop of wire.

3 a) Sketch a diagram to show the behavior of the film when punctured at point P (1 mk) (b) Explain your observation (1 mk) 4. The figure below shows a conical flask 15 cm high, filled with a liquid of density 1.2 g/cm 3. The atmospheric pressure of the surrounding is 8.4 x 10 4 Pa. Determine the pressure at the point X, at the bottom of the flask. (3marks) In the smoke cell experiment, what observations are made and what can we deduce from the experiment (2mks) Observation

4 Deduction 6. How is heat loss through radiation minimized in a vacuum flask? (1 mk) The diagram below shows a straw inserted into a flask. The straw has a bead of mercury trapped in it. What happens to the bead when the flask is removed from hot water and then dipped into cold water? (1mk) The spiral springs shown in the figure below are identical. Each spring has a spring constant K=3N/cm.

5 Determine the total extension caused by the 90N weight. (Ignore the weight of the springs and connecting rods.) (3marks).. 9. State the principle of moments. (1 mark) State one factor affecting stability of an object. (1mark) 11. The figure below shows a uniform meter rule pivoted at the 30 cm mark. It is balanced by a weight of 2N suspended at the 5 cm mark.

6 Determine the weight of the metre rule. (2marks). 12. The figure below shows part of a simple sub- marine, a ship that can travel both on water and under water. Explain how the tanks are used to change the depth of the sub-marine. (2 mks). 13. Water flows in a horizontal pipe of varying cross sectional area and diameter as shown in the figure below. A B If the cross-sectional area of A is 25cm 2 and that of B is 11.25cm 2 and also the rate at which the water flows from A is 100m/s, Calculate the speed water through B. (3mks).

7 .. SECTION B (55marks) Answer ALL questions from this section in the spaces provided. 14. (a) A car can be brought to rest from a speed of 180m/s in time of 1.8 seconds. Determine; (i) The average deceleration (3mks) (ii) The shortest stopping distance if the drivers reaction time is 0.2seconds (3mks). (b) (i) Define the term radian (1mk)

8 (ii) Calculate the angular velocity of a minute hand of a wrist watch (3mks). (c ) A trolley of mass 3kg is pulled along by an elastic cord and given an acceleration of 2.5m/s 2. Find the friction acting on the trolley if the tension on the cord is 20N. (3mks) The pulley system shown below is used to raise a load of 160N through a height of 1.2m at a constant speed using an effort of 40N in a time of 30 seconds.

9 a) Determine the velocity ratio of the system. (1mk) b) Determine the mechanical advantage of the pulley system. (2mks)... c) Determine the efficiency of the system. (2mks). (d) Determine the effort distance and hence work out the power developed by the effort. (4mks)

10 . 16. a) state two factors that affect the boiling point of a liquid. (2 marks). b) Water of mass 3.0Kg initially at 20 c is heated in an electric kettle rated 3.0kW. The water is heated until it boils at 100 c. (Take specific heat capacity of water= 4.2 kjkg -1 K -1, Heat capacity of the kettle = 450 JK -1, specific latent heat of vaporization of water = 2.3 mjkg -1 ). Determine; (i) The heat absorbed by the water; (2marks). Heat absorbed by the electric kettle; (2marks). (ii) The time taken for the water to boil; (3 marks)

11 .. (iii) How much longer will it take to boil away all the water. (3 marks). 17. (a) State what is meant by an ideal gas. (1mk). (b) The pressure acting on a gas in a container was changed steadily while the temperature of the gas was maintained constant. The value of volume V of gas was measured for various values of pressure. The figure shows the relation between the pressure, p, and the reciprocal of volume,.

12 (i) Suggest how the temperature of the gas could be kept constant (1mk) (ii)given that the relation between the pressure, P 1 and the volume,v 1 of the gas given by PV=k Where k is a constant, use the graph to determine the value of k (4marks).. iii) What physical quantity does k represents (1mk).. iv) State two precautions you would take when performing such an experiment. (2mks) a) State the law of floatation. (1mk).

13 . (b) A ship made of steel is observed to float on water yet the density of steel is approximately eight times that of water. Explain this observation. (2mks).. (c) The figure below shows a block of length 10 cm and uniform cross-sectional area of 13.5 cm 2 suspended from a spring balance and completely immersed in oil of density 0.8g/cm 3 Given that the density of the material is 1.25g/cm 3 determine; (i)the mass of the block (2mks)...

14 (ii) Reading of the spring balance (4mks).. (iii) The reading of the spring balance if the block was half immersed in the oil. (3mks).

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