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Question

A paper ball kept on the mouth of an empty plastic bottle will be pushed out if we press the bottle because:

A
The air pressure in the bottle is equal to the outside pressure.
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B
The air pressure in the bottle is greater than the outside pressure.
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C
The air pressure in the bottle is lower than the outside pressure.
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D
The mass of paper ball and plastic bottle is equal.
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Solution

The correct option is B The air pressure in the bottle is greater than the outside pressure.As we press the bottle, the air pressure inside the bottle becomes more than the pressure outside. Thus, a paper ball kept near the mouth of the bottle will be pushed out due to this pressure difference.

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