Question

Which of the following statements are correct regarding warm and cold air?
1. Warm air is lighter than cold air.
2. Warm air rises up.
3. Cold air sinks down.
4. Cold air is lighter than warm air.

• A. 1 and 2 only
• B. 1, 2, 3 only
• C. 3 and 4 only
• D. 1, 2, 3 and 4

Answer 1

The correct option is B 1, 2, 3 only

Warm air is lighter than the cold air. When air gets heated up it expands, occupies a larger volume and becomes less dense than the air surrounding it.
Thus, the warm air rises and the cold air sinks down.
Hence, statemets 1, 2 and 3 are correct.