The water level in the straw rises when air is sucked out, this is because
A) Atmospheric pressure has increased.
B) Air pressure inside the straw is the same as the atmospheric pressure.
C) Air pressure inside the straw becomes lower than the atmospheric pressure.
D) Air pressure inside the straw becomes higher than the atmospheric pressure.
Correct Answer: C
Solution :
When the air pressure inside the straw is less than the atmospheric pressure, water enters into it.
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