Question

Mercury when temperature decreases and when temperature increases.

• A. expands
• B. flows
• C. remains still
• D. contracts

Answer 1

Answer: (A), (D)

contracts

Mercury is a good conductor of heat. Mercury contracts and expands when temperature decreases and increases respectively. Mercury is preferred over other liquids because being a metal the rate of heat transfer is high and thus its response to temperature change is fast.