K.C.S.E Physics Q & A - MODEL 2019PP1QN17
​(a) State what ¡s meant by Brownian Motion.
(b) Figure 8 shows the graph of velocity against time For a small steel ball Falling in a viscous liquid. 
​(i) Describe the motion of the steel ball as represented by part OA
(ii) Explain why the velocity of A and B is constant (c)A student throws a tennis ball vertically upwards from the ground and it lands back after 8 seconds.( acceleration due to gravity g =10m/s2) Determine the: (i) maximum height reached by the ball iii) velocity with which the ball hits the ground.
answers
​(a) Continuous random motion of particles.
(b) (i) It accelerates, velocity increases. (ii) As the ball falls through the fluid, the Viscous drag increases until the sum of the Viscous drag and the upthrust becomes equal the weight of the steel ball, hence the resultant force becomes zero. 
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K.C.S.E Physics Q & A - MODEL 2018PP1QN05
It is observed that a drop of milk carefully put into a cup of water turns the water white after some time. State the reason for this observation.
answer
K.C.S.E Physics Q & A - MODEL 2015PP1QN06
​Figure 3 shows the arrangement of molecules in the three states of matter.
​(a) Name the process represented by the arrow.
(b) State the reason for the arrangement of molecules in state 3.
ANSWER
​(a) - freezing
(b) - The intermolecular forces are weaker K.C.S.E Physics Q & A - MODEL 2014PP1QN14
​In a smoke cell experiment to demonstrate Brownian motion, smoke particles are seen moving randomly. State the cause of the randomness.
answer
K.C.S.E Physics Q & A - MODEL 2013PP1QN13
​ A drop of blue ink is introduced at the bottom of a beaker containing water. It is observed that after some time, all the water in the beaker turns blue. Name the process that takes place.
answer
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