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

Pressing the brakes of a bicycle.

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Filling up the bicycle tube with air

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Riding bicycle against the flow of wind

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Playing with the kite

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Solution

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.

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