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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:
  1. The air pressure in the bottle is greater than the outside pressure.
  2. The air pressure in the bottle is lower than the outside pressure.
  3. The air pressure in the bottle is equal to the outside pressure.
  4. The mass of paper ball and plastic bottle is equal.


Solution

The correct option is A 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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