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Is it true that if a rubber sucker pressed on a flat surface sticks to the surface because the air pressure inside it is less than the air pressure outside?

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a

True

b

False

answer is A.

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Detailed Solution

The above statement is True.
A rubber sucker pressed on a flat surface sticks to the surface because the air pressure inside it is Less than the air pressure outside. A rubber pressed on a smooth surface gets stuck to the surface because of atmospheric pressure. When the rubber sucker is pressed against a flat smooth surface like a wall, the air is forced out between the surface and the wall, and this reduces the air pressure in the space which is between the surface and the wall in comparison to the air pressure outside.

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Is it true that if a rubber sucker pressed on a flat surface sticks to the surface because the air pressure inside it is less than the air pressure outside?