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

Answer 1

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.