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
K.C.S.E Physics Q & A - MODEL 2012PP1QN14
​(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 5 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
K.C.S.E Physics Q & A - MODEL 2010PP1QN07
​Figure 4 shows a horizontal tube with two vertical tubes x and y. Water flows through the horizontal tube from right to left. The water level in tube x is higher than water level in tube y.
​Explain this observation.
answer
K.C.S.E Physics Q & A - MODEL 2010PP1QN04
​A paper windmill in a horizontal axis was placed above a candle as shown in figure 2.
When the candle was lit the paper windmill begun to rotate.
Explain this observation.
answer
K.C.S.E Physics Q & A - MODEL 2008PP1QN12
​Fig. 6 shows a sheet of paper rolled into a tube.
​When a fast stream of air is blown into the tube as shown in the diagram the paper tube collapses. Explain the observation.
answer
K.C.S.E Physics Q & A - MODEL 2007PP1QN03
Figure 2 shows a tube of varying cross sectional area​
​Arrange the speed V1V2V3 and V4 in decreasing order starting with the highest
answer
​V2 V4 V1 V3
K.C.S.E Physics Q & A - MODEL 2006PP1QN11A pipe of radius 6 mm is connected to another pipe of radius 9 mm. If water flows in the wider pipe at the speed of 2 ms-1, what is the speed in the narrower pipe?
answer
K.C.S.E Physics Q & A - MODEL 2005PP1QN26
State Bernoulli's principle.
ANSWERS
K.C.S.E Physics Q & A - MODEL 2003PP1QN36
Figure 19 shows a pith ball placed in a flask. When a jet of air is blown over the mouth of the flask as shown, the pith ball is observed to rise form the botto
​Explain this observation
ANSWER
K.C.S.E Physics Q & A - MODEL 2001PP1QN23
Fig. 16 shows a non – viscous fluid flowing through a pipe a long which vertical tubes A, B and C have been fitted.
​Complete the diagram by indicating the possible levels of the fluid in tubes B and C.
answer
K.C.S.E Physics Q & A - MODEL 2000PP1QN25
​A student holds a sheet of paper at one end so that it hangs in the position A shown in fig. 14
​Explain why the paper rises to the position B when the student blows air in the direction shown by the arrow.
ANSWER
K.C.S.E Physics Q & A - MODEL 1998PP1QN30
Fig 9 shows a Bunsen burner.
Use Bernoulli's principle to explain how air is drawn into the burner, when, the gas tap is opened.
ANSWER
K.C.S.E Physics Q & A - MODEL 1997PP1QN17
Water flows in a horizontal smooth pipe. State the changes that would be observed in the nature of the flow if the speed of the water is steadily increased from low to a high value
answers
K.C.S.E Physics Q & A - MODEL 1995PP1QN23
Figure 7 represents a tube through which a liquid is flowing in the flowing in the diagram shown by the arrow
​Show on the diagram the relative positions of the levels of the liquid in section marked x, y and z
K.N.E.C MARKING SCHEME
1. 1996 Q24 P1
State how the pressure in a moving fluid varies with the speed of the fluid (1 mark) 2. 1997 Q18 P1 Water flows in a horizontal smooth pipe. State the changes that would be observed in the nature of the flow if the speed of the water is steadily increased from low to a high value 3. 1998 Q30 P1 Fig 9 shows a Bunsen burner.
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