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Question

A rubber sucker, when pressed on a surface sticks to it, because:


A

The suckers have a very strong adhesive which holds it in place

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B

Rubber sucker has some glycerin in it

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C

Gravitational pull acts on it

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D

Atmospheric pressure acts on it externally

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Solution

The correct option is D

Atmospheric pressure acts on it externally


A rubber sucker, when pressed on a surface creates a partial vacuum as shown in the figure.

Once all the air is pushed out and a vacuum is created, the pressure exerted by the air outside is way more than the pressure inside, and hence it sticks to the surface.


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