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KCSE CLUSTER TEST 14

Physics Paper 1

SECTION A (25 Marks)

Answer all the questions in this section in the spaces provided.
1.

Figure 1 below shows a measuring instrument. State its degree of accuracy.

1 marks

2.

a) A micrometer screw gauge has a zero error of -0.05mm. Show this reading on a micrometer screw gauge.

b) A student used the above instrument to determine the diameter of a resistance wire whose actual diameter was 0.25mm. What was its reading

2 marks

3.

3. A body of mass 7.5kg has a weight of 30N on a certain planet.

Calculate the gravitational field strength of the planet.

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

3 marks

4.

4. With an appropriate reason, identify the suitable cross-sectional shape of a dam wall as represented in figure 2

Wall:.................................................................................................................

Reason..................................................................................................................................... ..................................................................................................................................

2 marks

5.

Figure 3 below shows a simple bimetallic thermostat thermometer used for detecting fire.

Explain how the fire alarm works.

3 marks

6.

Figure 4 shows the effects of carbon (IV) oxide on global warming.

On the same diagram show the radiation from the earth, and explain how the global warming occurs.

3 marks

7.

Some sugar is added into water and then stirred to dissolve. The solution is tasted and it is found to be too sugary. When more water is added to the solution, it finally becomes tasteless. Explain the reason for this observation.

1 marks

8.

Figure 5 shows a uniform bar in equilibrium under action of two forces. The weight of the bar is 5N

Determine the value of F

2 marks

9.

Figure 6 below shows a block of wood held under water by a thread attached at the bottom of the container.

State and explain the state of equilibrium of the block of wood

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

3 marks

10.

Figure 7 below shows air flowing through a pipe of non- uniform cross sectional area.

Two pipes A and B are dipped into the liquid as shown.

Indicate the levels in pipe A and B

3 marks

11.

The figure 8 show a velocity – time graph for a body

On the axes provided, draw a speed –time graph for the same motion.

3 marks

12.

. Pulley system of VR=4 is used to raise a load of 80N using an effort of 20N If the load is raised through a height of 60cm at a constant speed using the effort in a time of 15 seconds. Calculate the power developed by the effort.

2 marks

13.

Figure 9 shows a test tube with a sliding cork balanced horizontally.

State and explain what is observed when it is heated slightly.

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

2 marks

14.

Figure below shows a block of wood floating on water.

State what happens to the block when water is heated.

1 marks

SECTION B (55 Marks)

Answer all the questions in this section in the spaces provided.
15.

The figure 11 shows a tape pulled by a trolley and passed under a ticker time of frequency 40Hz. Determine; a) Average velocity between

i) A and B

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

ii) D and E

..................................................................................................................................... ..................................................................................................................................... b) Acceleration of the trolley

c) Figure 12 shows a body of mass M attached to the centre of a rotating turn table with a string and a spring balance to measure the tension on the string.

The tension, T, on the string was measured for various values of angular velocity, ‍

The distance r of the body from the centre was kept constant, at 30cm.

The graph below of tension T against 2 represents the results obtained.

11 marks

16.

a) The graph in figure 13 below was obtained when 0.5kg hot liquid Naphthalein in an aluminium can of mass 0.4kg was allowed to cool to room temperature.

Explain the shape of the graph at each state of cooling.

..................................................................................................................................... ..................................................................................................................................... ..................................................................................................................................... ..................................................................................................................................... ii) Specific heat capacity for liquid and solid naphthalein are 2100J/kgK and 900J/kgK.

Specific latent heat of fusion of naphthalein is 170 000J/kg.

Calculate the total amount of heat lost by naphthalein.
iii) State two factors that affected the rate at which the naphthalein cooled

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

b) A 20cm long column of air is trapped in a tube closed at one end by mercury column of length 780mm as shown in figure 14.

The atmospheric pressure in 760mmHg.

i) State the pressure of the trapped gas when the tube is held horizontally. ..................................................................................................................................... .....................................................................................................................................

ii) Determine the height of air column when the tube is held vertically with the open end facing downward .....................................................................................................................................

12 marks

17.

. a) Define force in terms of momentum.

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

b) A bullet of mass 0.02kg travelling at a horizontal velocity of 500ms-1, embeds itself in a piece of wood of mass 1.98kg suspended on a light inextensible string. The two swing as shown in figure 15 below.

Determine i) The velocity of the bullet and piece of wood just after collision.

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

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

ii) The height, h, through which the two rises.

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

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

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

Determine

i) The velocity of the bullet and piece of wood just after collision.

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

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

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

ii) The height, h, through which the two rises.

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

11 marks

18.

. a) State the Archimedes principle

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

b) Figure 17 below shows a solid block of volume 12cm3 attached to a balloon using a cable of negligible weight.

The solid block is immersed in water but the balloon is in air.

The balloon contains a gas of density 0.1kg/m3 and volume 0.5m3

The balloon fabric and fittings weigh 3.08N while the solid block weigh 4.0N. If the density of air is 1.3kg/m3 and that of water is 1000kg/m3. Determine the;

i) Upthrust on solid block in water.

ii) Volume of the gas that must be added so that the balloon can just lift the solid block
c) Figure 18 below shows a hydrometer.

The hydrometer measures relative density of liquids of values between 0.8 and 1.5. i) Between point A and B state with reason the one would represent the value 0.8 and 1.5.

ii) Give a reason why - Lead shots are placed at the bottom of the bulb.

- The bulb is wide

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

10 marks

19.

a) Define work and state its SI unit

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

b) Figure 19 below shows two pulleys systems being used to raise different loads. The pulleys are identical.

c) Figure 20 below shows a car screw jack

An effort of 50N is applied on the handle. The handle moves through a circle of radius 14cm. The pitch of the screw is 2cm.

Calculate

. i) The velocity ratio of the screw jack

..................................................................................................................................... ..................................................................................................................................... ii) The weight of the car raised if the efficiency of the car screw jack is 30%

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

9 marks

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