Question

Two identical glass spheres filled air are connected by a thin horizontal glass tube. The glass tube contains a pellets of mercury at its mid-point. Air in one sphere $0^0$ and the other is at ${20}^0$ .If temperature of both vessels are increased by ${10}^0$, then neglecting the expansions of the bulbs and the tube :

• A. the mercury pellets gets displaced toward the sphere at lower temperature
• B. the mercury pellets gets displaced toward the sphere at higher temperature
• C. the mercury pellets does not get displaced at all.
• D. The mercury will gets shrink

Answer 1

The correct option is B the mercury pellets gets displaced toward the sphere at higher temperature

R.E.F image

Both glass spheres A & B have

same volume, and have same

Pressure, an mercury pellet is at

exact middle

By Ideal Gas Low, $PV=nRT$

we get, $n\propto \frac{1}{T}\to \left(1\right)$ and $P\propto n\to \left(2\right)$

as temp. of B in higher, it contains learn amount of water.

as temp. Increase, the pressure on A gets higher as it contains more

air [From(2)], so the pellet displace to word right.