The paper ball kept near the mouth of a plastic bottle will be pushed out because
A. the air pressure inside the bottle is same as that at the mouth
B. the air pressure inside the bottle is more than that at the mouth
C. the air pressure inside the bottle is less than that at the mouth
D. the pressure inside and outside the bottle same.
Answer:B
The paper ball kept near the mouth of a plastic bottle will be pushed out because
A. the air pressure inside the bottle is same as that at the mouth B. the air pressure inside the bottle is more than that at the mouth C. the air pressure inside the bottle is less than that at the mouth D. the pressure inside and outside the bottle same.