Question

At a given place barometer reads 76 cm of mercury when its tube is absolutely vertical. When the tube is tilted, the reading of the barometer will be

• A. more than 76 cm
• B. 76 cm
• C. less than 76 cm
• D. none of the above

Answer 1

The correct option is B

76 cm

Explanation of correct option:

option b)

1. The atmospheric pressure at a place is measured by a barometer.
2. The barometer is designed by Italian scientist Torricelli.
3. Mercury is used as the pressure measuring liquid in the barometer.
4. At sea level, the atmospheric pressure is 76 cm of mercury in the barometer.
5. In the observation of measuring atmospheric pressure, it is found that:

a) The vertical height of mercury in the tube is independent of the shape or size of the tube.

b) It does not change if the tube is tilted.

Thus, option (b) 76 cm is the correct option.