Question

With the increase in temperature, the level of water

• A. increases slowly in a capillary tube.
• B. increases rapidly in a capillary tube.
• C. decreases in a capillary tube.
• D. first increases and then decreases in a capillary tube.

Answer 1

The correct option is C

decreases in a capillary tube.

The rise of liquid in a capillary tube is directly proportional to the surface tension and surface tension on a liquid's surface is directly proportional to its density. Therefore, if we increase the temperature, the density of the liquid decreases and consequently there is a decrease in the capillary rise.