Question

Ventilators are provided near ceilings in the rooms of our houses because:
1. Hot air is lighter than cool air.
2. Hot air rises up and cool air settles down.
3. Hot air is heavier than cool air.

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

Answer 1

The correct option is D 1 and 2 only

Ventilators are provided near ceilings in the rooms of our houses because the hot air is lighter and rises out of the room through the ventilators. Cool fresh air rushes into the room through the doors and windows to occupy its place.
Hence, statements 1 and 2 are correct.