Question

A manometer reads the pressure of a gas in an enclosure as shown in the figure. The absolute and gauge pressure of the gas in cm of mercury is (take atmospheric pressure =76 cm of mercury)
A. 76,20
B. 20,76
C. 96,20
D. 20,96

Answer 1

Correct Answer - C
Here, atmospheric pressure P=76 cm of mercury . In figure,
Pressure head, h=20 cm of mercury
Absolute pressure `=P+h=76+20=96 cm` of mercury Gauge pressure `=h=20 cm` of mercury.