1.

In barometer, the given space labelled as A, above the mercury is(a) Vacuum(b) Filled with Air(c) Filled with water(d) Filled with Gas

Answer» Right choice is (a) Vacuum

The explanation is: To correctly measure the atmospheric pressure, the space above the mercury level in a barometer is essentially vacuum. Otherwise, the fluid in the space will exert a pressure on the mercury surface.


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