The level of mercury in a barometer would fall if ___:
1. It is taken from sea level to a high altitude
2. A storm is approaching
3. Radius of barometer is increased
Choose the correct option from the codes given below:

Answer: [B] Only 1 & 2

Mercury barometer is used for measuring atmospheric pressure. Because atmospheric pressure changes with distance above or below sea level, a barometer can also be used to measure altitude. There is no change in the mercury level when the radius of tube in the barometer is increased.

This question is a part of GKToday's Integrated IAS General Studies Module