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Question

A magician fills up one third of a glass with water. He places a card over the mouth of the glass and inverts it. Why doesn't the water fall?

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A

The air pressure outside the glass keeps the cardboard in place

B

The weight of the the water is balanced by the weight of the cardboard

C

It is magic

D

The air pressure inside the glass is higher

Hard

Solution

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Correct option is
A

The air pressure outside the glass keeps the cardboard in place

The air outside exerts an upward pressure on the index card. This air pressure is more than the weight of the water in the glass.

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