Question

The container in which the glass tube is inverted is open from the top in a mercury barometer. What problem may arise due to this?

• A. Atmospheric pressure may not be recorded correctly.
• B. Calibrations may be disturbed.
• C. Impurities may fall into the tube making the mercury impure.
• D. It may form a bigger meniscus.

Answer 1

The correct option is C Impurities may fall into the tube making the mercury impure.

The container in which the glass tube is inverted is open from the top in a mercury barometer. Hence, impurities may fall into the tube making the mercury impure.