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Question

The lower end of a capillary tube is at a depth of 12 cm and the water rises 3 cm in it. The mouth pressure required to blow an air bubble at the lower end will be X cm of water column where X is :

A
3
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B
9
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C
12
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D
15
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Solution

The correct option is D 15
From the figure,

P=P1P0

P=P0+ρghP0=ρgh

ρgx=(3+12)ρg

x=15cm

The correct option is D.

1444015_1211242_ans_065d9b8f13e640b39afe30f4adf5d675.png

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