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Question

A barometer tube reads 76 cm of Hg. If the tube is gradually inclined at an angle of 30 with horizontal, then find the length of the mercury column in the barometer tube.

A
142 cm
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B
152 cm
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C
132 cm
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D
122 cm
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Solution

The correct option is B 152 cm
We know that barometer is used to measure atmosphere pressure.
Given, atmospheric pressure, Po=76 cm of Hg
h=76 cm

When the tube is inclined, then the vertical height of the mercury column will remain the same as atmospheric pressure is the same.

From figure, lsin30=76
l=76sin30=152 cm

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