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Q.

Is it true that when we press a rubber sucker on a smooth surface, it sticks to the surface?


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a

True

b

False 

answer is A.

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Detailed Solution

The above statement is True.
When we press a rubber sucker against a smooth surface, it sticks to the surface because the sucker removes some of the air between the smooth surface and the sucker. This lack of air allows the air outside to exert pressure on the sucker's surface, and on the surface, refilling the air gets expelled. The sucker remains stuck to the surface due to the force of the atmospheric pressure.
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