Solve

Guides

0

You visited us 0 times! Enjoying our articles? Unlock Full Access!

Air Exerts Pressure

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?

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

Open in App

Solution

Verified by Toppr

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.

Was this answer helpful?

0

Similar Questions

Q1

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?

View Solution

Q2

A magician fills up one-third of a glass with water. He places a card over the mouth of the glass and inverts it. The water doesn't fall. Pick the correct explanation for this phenomenon

View Solution

Q3

A glass is filled with water up to its brim and a thick hand card placed on top of it. Now keeping the card tightly closed and pressed with palm, the glass full of water is inverted and placed upside down. The palm is gently removed from the card. It is observed that the piece of card dose not fall off the glass though the glass is full of water and its whole weight is exerting pressure on the card. Why does it happen?

View Solution

Q4

A glass jar is completely filled with water and over its mouth is placed a glass disc. By placing the hand on the disc, the cylinder is inverted. The hand is removed from the disc. It is found that the disc does not fall. The experiment proves that air exerts pressure:

View Solution

Q5

Fill a glass with water upto the top (brim).
Place a card completely covering the open surface of the water and now invert the glass with the
card over it.
Do the card drops?
Repeat the same activity with water in the glass upto different heights.
Do the observations in different cases are same?

View Solution