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KCSE CLUSTER TESTS 16

Physics Paper 1

SECTION A (25 Marks)

Answer ALL questions
1.

In an experiment to measure the density of a liquid, a student filled a burette with a liquid to the 0cm3 mark. The figure below shows a section of the burette showing the level of the liquid after 54.5g of the liquid had been run out.

Determine the density of the liquid. (Give your answer correct to 4 significant figures) ............................................................................................................................................................ ............................................................................................................................................................ ............................................................................................................................................................

3 marks

2.

A student observed a metal pin floating on the surface of pure water. State and explain ONE way in which the student would cause the pin to sink. ............................................................................................................................................................ ............................................................................................................................................................

3 marks

3.

A vacuum pump was used to pump out air from the glass tube immersed in two liquids as shown below:

Determine the density of liquid X giving your answer in SI units. (Take density of water =1gcm-3). ............................................................................................................................................................ ............................................................................................................................................................

3 marks

4.

A metal handle feels colder to touch on a very cold morning than a wooden handle of a door. Explain. ............................................................................................................................................................ ............................................................................................................................................................

2 marks

5.

A very hot liquid is poured into two glasses one with a thick wall and the other with a thin wall. State with reason which glass is more likely to crack. ............................................................................................................................................................ ............................................................................................................................................................

2 marks

6.

The figure below shows two pulley systems being used to raise different loads. The pulleys are identical.

State ONE reason why system B may be more efficient than system A. ............................................................................................................................................................ ............................................................................................................................................................

1 marks

7.

The figure below shows a micrometer screw gauge being used to measure the diameter of a metal rod.

What is the reading shown?

............................................................................................................................................................

1 marks

8.

The figure below shows a 1metre long uniform metal bar in equilibrium.


Determine the weight of the metal bar.

............................................................................................................................................................ ............................................................................................................................................................ ............................................................................................................................................................

3 marks

9.

State how the position of the centre of gravity of a body in unstable equilibrium changes when the body is slightly tilted. ............................................................................................................................................................ ............................................................................................................................................................

1 marks

10.

The spiral springs shown in the figure below are identical. Each spring has a spring constant, k= 300Nm-1

Determine the total extension of the system giving your answer correct to 1 decimal place. (Ignore the weight of the springs and connecting rods). ............................................................................................................................................................ ............................................................................................................................................................

3 marks

11.

Using the kinetic theory of gases, explain how a rise in temperature of a gas causes a rise the pressure of the gas at constant temperature. ............................................................................................................................................................ ............................................................................................................................................................

1 marks

12.

A trolley is moving at constant speed on a friction compensated track. Some plasticine is dropped on the trolley and sticks on it. State with a reason what is observed about the motion of the trolley.

2 marks

13.

State ONE assumption made in the calculation of the thickness of an oil molecule in the oil drop experiment.

1 marks

SECTION B (55 Marks)

Answer ALL questions
14.

a) A ball is thrown vertically upwards from the ground. It rises up to the highest point and then returns to the ground. Taking the upward velocity to be positive, sketch the velocity time graph for the motion,

............................................................................................................................................................ ............................................................................................................................................................

b) A bullet is fired from a gun at a velocity of 20m/s. It strikes a tree perpendicularly and penetrates deeply. If it stops just as it emerges on the other side of the tree,

i) Calculate the average retardation if the tree is 2m thick.

............................................................................................................................................................ ............................................................................................................................................................

ii) Time taken by the bullet in the tree.

............................................................................................................................................................ ............................................................................................................................................................

c) Frictional force has advantages and disadvantages. State two advantages and two disadvantages of friction. ............................................................................................................................................................ ............................................................................................................................................................

11 marks

15.

a) Explain why it’s advisable to use a pressure cooker for cooking at high altitudes. ............................................................................................................................................................ ............................................................................................................................................................

Determine:-

i) The heat absorbed by the water

....................................................................................................................................................... .......................................................................................................................................................

ii) The heat absorbed by the electric kettle.

....................................................................................................................................................... .......................................................................................................................................................

iii) Time taken for the water to boil.

....................................................................................................................................................... .......................................................................................................................................................

iv) How much longer it will take to boil away all the water.

.......................................................................................................................................................

12 marks

16.

a) A hot air balloon is tethered to the ground on a windless day as shown below. The balloon contains 1600m3 of hot air of density 0.7kg/m3. The mass of the balloon fabric is 400kg and density of surrounding air is 1.3kg/m3.

Calculate :-

i) The tension in the rope.

....................................................................................................................................................... .......................................................................................................................................................

ii) Acceleration with which the balloon begins to rise when the rope is cut. ....................................................................................................................................................... .......................................................................................................................................................

b) A rod of cross section area 3.0cm2 and length 16cm floats vertically upwards in a liquid of density 1.1g/cm3 with its length of 7cm above the surface. Determine:-

i) Mass of the rod.

....................................................................................................................................................... .......................................................................................................................................................

ii) The depth to which it will be submerged if put in a liquid of density 0.8g/cm3. ....................................................................................................................................................... .......................................................................................................................................................

13 marks

17.

The graph below shows how the length of an elastic band varies with the force applied to it.

i) State the natural length of the band.

....................................................................................................................................................... .......................................................................................................................................................

ii) Determine the elastic constant for the band.

....................................................................................................................................................... .......................................................................................................................................................

iii) Determine the energy stored in the band when stretched to a length of 35cm. ....................................................................................................................................................... .......................................................................................................................................................

iv) The band is now released from a length of 35cm to project a marble of mass 20g. Calculate the velocity with which the marble takes off. ....................................................................................................................................................... .......................................................................................................................................................

10 marks

18.

a) State what is meant by centripetal acceleration.

....................................................................................................................................................... .......................................................................................................................................................

b) The figure below shows masses A, B and C placed at different points on a rotating table. The angular velocity of the table can be varied.

i) State two factors that determine whether a particular mass slides off the table or not.

....................................................................................................................................................... .......................................................................................................................................................

c) A block of mass 200g is placed on a frictionless rotating table while fixed to the centre of the table by thin thread, the distance from the centre of a table to the block is 15cm. If the maximum tension the thread can withstand is 5.6N. Determine the maximum angular velocity the table can attain before the thread cuts.

....................................................................................................................................................... .......................................................................................................................................................

9 marks

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