K.C.S.E Physics Q & A - MODEL 1995PP1QN04, 05 AND 06

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​Figure 2 shows a liquid being siphoned from one beaker to another. Refer to this diagram where answering questions 4, 5 and 6

• 4. Indicate  on the diagram the direction of flow of the liquid     (1 mk)
  
  
• 5. Show that the force driving the liquid through the U – tube is proportional to the height, h      (3 mks)
  
  
• 6. State what would happen to the flow if the system in figure 2 were put in vacuum     (1 mk)

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KNEC ANSWERS

• ​4. Flow from a to B
• 5. Pressure difference between liquids in A and B is P = egh where e is liquid, g = acceleration due to gravity and h is height
  But force = P x cross section area of siphon, P = F/A
  Thus F = egh A Since e.g. A are constants
  F α h
• 6. No change in flow OR the flow will still continue