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Question

Which of the following is not an example of air exerting pressure ?
  1. Pressing the brakes of a bicycle.
  2. Filling up the bicycle tube with air
  3. Riding bicycle against the flow of wind
  4. Playing with the kite

A
Riding bicycle against the flow of wind
B
Filling up the bicycle tube with air
C
Playing with the kite
D
Pressing the brakes of a bicycle.
Solution
Verified by Toppr

Brakes on a bicycle work using friction (the rubbing force between two things that slide past one another while they're touching). Hence brakes doesn't work on the principle of air exerting pressure.

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