K.C.S.E Physics Q & A - MODEL 2015PP2QN03
State the reason for topping up a lead - acid accumulator with distilled water.
answer
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K.C.S.E Physics Q & A - MODEL 2015PP2QN02
​It is observed that when a charged body is brought near the cap of a positively charged electroscope, the divergence of the leaf increases. State the type of charge on the body.
answer
K.C.S.E Physics Q & A - MODEL 2015PP2QN01
​ Figure 1 shows three mirrors arranged at right angles to each other. A ray of light is incident on one of the mirrors.
​Complete the diagram to show the path of the ray after reflection on each of the mirrors.
K.C.S.E Physics Q & A - MODEL 2015PP1QN18
​ (a) Figure 13 shows a pendulum bob suspended by a thread moving in a horizontal circle
​(i) Name two forces acting on the pendulum bob as it moves.
(ii) State what happens to each of the forces when the angular velocity of the pendulum bob is increased. (iii) State two applications of uniform circular motion in daily life. (b) Figure 14 shows a block floating in water.
​When the water is heated; it is observed that the block sinks further. Explain this observation.
answers
​(a) (i) Tension (T)
Weight (Mg) (ii) Tension - increases Weight - remains constant (iii) Centrifuges Speed governors Merry-go-rounds (b) When heated the density of the water decreases hence block sinks further as it displaces more volume of water. K.C.S.E Physics Q & A - MODEL 2015PP1QN17
​(a) Figure 11 shows a graph of pressure (p) against volume (y) for a fixed mass of a gas at constant temperature
​In the space provided, sketch the corresponding graph of p against 1/v.
(b) Explain the pressure law using the kinetic theory of gases. (c) 20 cm3 of a gas exerts a pressure of 760 mmHg at 25°C. Determine the temperature of the gas when the pressure increases to 900 mmHg and the volume reduces to 15 cm3. (d) Figure 12 shows the path of a light ball projected horizontally.
The ball is then made to spin in an anticlockwise direction as it moves:
(i) on the same axis, sketch the new path of the ball. (ii) explain how the ball attains the new path K.C.S.E Physics Q & A - MODEL 2015PP1QN16
​(a) Figure 10 shows an incomplete set up that can be used in an experiment to determine the specific heat capacity of a solid of mass m by electrical method.
​(i)complete the diagram by inserting the missing components for the experiment to work.
(ii)Other than temperature, state three measurements that should be taken. (iii) The final temperature was recorded as O. Write an expression that can be used to determine the specific heat capacity of the solid. (b) State three ways of increasing the sensitivity of a liquid-in-glass thermometer K.C.S.E Physics Q & A - MODEL 2015PP1QN15
(a) Figure 8 shows a 200 g mass placed on a frictionless surface and attached to a spring.
The spring is compressed and released. Given that the elastic potential energy of the compressed spring is 2.7 X 10-2 J, determine the maximum speed with which the block moves after it is released.
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