Question

A paper ball is kept at the mouth of a plastic bottle. When the bottle is compressed by hand, the paper ball will be pushed out. This is because:

• A. the air pressure inside the bottle is same as that at its mouth
• B. the air pressure inside the bottle is more than the pressure at its mouth
• C. the air pressure inside the bottle is less than that at its mouth
• D. the pressure is same in the bottle and outside it

Answer 1

The correct option is B

the air pressure inside the bottle is more than the pressure at its mouth

The air pressure inside the bottle is more than the pressure at its mouth. Thus, a paper ball kept near the mouth of a plastic bottle will be pushed out due to this pressure difference.