K.C.S.E Physics Q & A - MODEL 2019PP1QN10
​For a fluid flowing at a velocity V in a tube of cross-sectional area A, VA =constant. State two assumptions made in deriving this equation.
answer
The assumptions are: the fluid is
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K.C.S.E Physics Q & A - MODEL 2017PP1QN06
State the reason why the speed of water at the narrow section of a river is higher than at the wider section.
answer
K.C.S.E Physics Q & A - MODEL 2016PP1QN08
(a)An aeroplane is moving horizontally through still air at a uniform speed. It is observed that when the speed of the plane is increased, its height above the ground increases. State the reason for this observation.
​(b)Figure 6 shows parts A, B and C of a glass tube. 
​State with a reason the part of the tube in which the pressure will be lowest when air is blown through the tube from A towards C.
answers
​(a) Increase in the speed of the plane decreases the pressure of air above it while the pressure below it remains high. This leads to a resultant upward force
(b) Point B The velocity is high at this point hence pressure decreases K.C.S.E Physics Q & A - MODEL 2015PP1QN09
​Figure 5 shows air flowing through a pipe of different cross-sectional areas. Two pipes A and B are dipped into water.
​Explain the cause of the difference in the levels of water in the pipes A and B.
ANSWER
K.C.S.E Physics Q & A - MODEL 2014PP1QN11
​Figure 7 shows an incompressible fluid flowing through a pipe, A1 and A2 are the cross-sectional areas of the pipes in the larger section and smaller section of the pipe respectively, while V1 and V2 are speeds of the fluid at the two sections of the pipe.
​Derive an expression for the ratio of the speeds V2/V1 in terms of A1 and A2.
answer
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