Question

For a hot object and a cold object, what can we say about the movement of their molecules?

• A. The molecules of both the objects are equally active.
• B. The molecules of hot object are more active.
• C. The molecules of cold object are more active.
• D. The molecules of cold object are not active at all.

Answer 1

The correct option is B The molecules of hot object are more active.

The movement of molecules of an object depends on the temperature of the object. The molecules of a hot object move with a greater speed or vigour than those of a cold object. Therefore, the molecules of a hot object are more active than those of a cold object.