Which of the given statements best explains why the cardboard does NOT fall?
A) The wet cardboard sticks to the glass.
B) Atmospheric pressure acts equally on the glass and on the cardboard.
C) The force of gravity pulling the cardboard is negligible.
D) Air exerts pressure on the cardboard in the upward direction.
Correct Answer: D
Solution :
Air exerts upward pressure and hence the cardboard does not fall.
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