Q. A barometer is kept inside a bell jar. Air is slowly pumped out of the jar.
✅ Correct Answer: (A)
The mercury level starts rising
Explanation: As the pump removes the air from the bell jar the pressure obviously reduces around the barometer. The reduction in pressure around the barometer leads it to expand. As the pump removes air from the jar, the mercury level rises.
Explanation by: Rudra Pratap Singh
As the pump removes the air from the bell jar the pressure obviously reduces around the barometer. The reduction in pressure around the barometer leads it to expand. As the pump removes air from the jar, the mercury level rises.