Question

A number of small drops of mercury coalesce adiabatically to form a single drop. The temperature of drop

• A. Increases
• B. Is infinite
• C. Remains unchanged
• D. May decrease or increase depending upon size

Answer 1

The correct option is D May decrease or increase depending upon size

In the combined drop, there is a small amount of work done by the surface tension as it pulls the excess surface of combined drop and since the system is adiabatic the energy has to remain with in mercury.

At first ,drop will changes its shape and but due to viscosity of mercury it settle down but there is small raise in temperature.

Hence, the answer is may decrease or increase depending upon size.