Question

Which of the following is not an example of air exerting pressure ?

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

Answer 1

The correct option is A Pressing the brakes of a bicycle.

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.