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Q.

The normal atmospheric pressure is


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a

70 cm  of mercury

b

76 cm of mercury

c

67 cm of mercury

d

80 cm of mercury 

answer is B.

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Detailed Solution

The normal atmospheric pressure is 76 cm of mercury.
A barometer is used to measure the atmospheric pressure in terms of the height of the mercury column. A mercury barometer is used to measure the Air pressure. Under normal atmospheric pressure, the mercury column takes a height of  76 cm. Therefore, the pressure exerted by  76 cm high mercury column is measured as 1 atmospheric pressure.
 
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