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Question

A glass bulb is connected to an open limb manometre. The level of mercury in both limbs of the manometer was same. The bulb was heated to 57C. If the room temperature and the atmospheric pressure were 27C and 750 mm.Find the difference of levels in the two limbs now.


A

2.5 cm

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B

5.0 cm

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C

7.5 cm

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D

10.0 cm

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Solution

The correct option is C

7.5 cm


P1T1=P2T275×d×g300(75+x cm)dg33075 + x cm=75×330300=82.5x=7.5 cm


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