2019 MOKASA Physics Paper 1
1. Define a free fall.
3.A uniform bar is pivoted at a point 30cm from one end. A force of 12N at the end of the shorter side keeps the bar in equilibrium. If the length of the bar is 1 metre, determine the weight w, of the bar. (2 marks)
4.
(c) What conclusion can be drawn from the above experiment? (1 mark)
5. An immersion heater consumes a voltage of 240V and a current of 10A. If it is used to heat 5kg of water at 200C, find the final temperature of water after 7 minutes. (Take the specific heat capacity of water = 4200 J/kgk) (3 marks)
7. The figure 4 below shows a pipe of varying cross-section. Three vertical tubes X, Y and Z of same diameter are fixed to the section A, B and C of the pipe respectively as shown below.
Given that the water flows in the direction shown by the arrow, indicate on the diagram the relative levels of water in Y and Z. (1 mark)
9. The Figure 6 below shows a spiral spring when not compressed and when compressed by a mass of 4.0kg.
Determine the elastic potential energy stored by the compressed spring in (b).
10. The bicycle pump shown in Figure 7 below is one of the applications of pressure in
gases.
Explain how the leather washer functions during; (2 marks)
(a) backstroke
(b) forward stroke
11. Explain how greenhouse effect increases the average temperate of the earth. (2 marks)
12. (a) The Figure 8 below shows a planet Venus orbiting the sun in a circular orbit at constant speed.
Indicate the direction of centripetal force on the planet
14. (a) An unknown amount of kerosene was heated using a heater rated 240V, 100W. The temperature of kerosene was recorded at 2 minutes intervals. The graph OMN in the Figure 12 below was plotted.
(a) (i) State the boiling point of kerosene. (1 mark)
(ii) What happens to the heat supplied by the heater on part MN of the graph? (1 mark)
(iii) From the graph determine the electrical energy supplied by the heater on part OM of the graph. (2 marks)
(iv) Determine the mass of kerosene that was used in the experiment. (Assume heat gained by the beaker and the surrounding is negligible) (3 marks)
Take specific heat capacity of kerosene to be 2200 JKg-1K-1 .
15. (a) A student constructed the simple thermometer shown in the figure 14 below.
(i) Why must the tube be made of thin glass? (1 mark)
(ii) Assuming that the weight of the pellet is negligible, what will the pressure of the trapped air be when the tube is vertical? Explain. (2 marks)
(b) She placed the thermometer in water which was at various temperatures and obtained the graph shown in Figure 15 below.
(i) Use the graph to find the temperature when the air column is zero. (1 mark)
(ii) What is the temperature called? (1 mark)
(i) Which of the gas laws does this set-up apply? Verify. (1 mark)
(c) (i) State the SI unit of momentum as used in Physics. (1 mark)
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