STANDARD Physics Pressure Measurement MCQ 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)
76, 20
20, 76
96, 20
20, 96
Correct Answer
Detailed Explanation
The atmospheric pressure is 76 cm of mercury. The pressure head in the figure is 20 cm of mercury. Therefore, the absolute pressure is 76 + 20 = 96 cm of mercury, and the gauge pressure is 20 cm of mercury.
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