Question

Mercury, a metal filled inside a thermometer rise and fall as per the change in our body temperature. This change is an example of _____ change.

• A. an irreversible physical
• B. an irreversible chemical
• C. a reversible physical
• D. a reversible chemical

Answer 1

The correct option is C a reversible physical

Mercury is a liquid metal filled in a thermometer. Depending on the variation in our body temperature, the metal expands and contracts. However, as there aren’t any new substances formed, this is a physical change. So, the rise and fall of mercury in a thermometer is an example of reversible physical change.