Question

The given image can be related to which of the following phenomena?

• A. Hot air rises up
• B. Cold air settles down
• C. Air has direction
• D. Both B and C

Answer 1

The correct option is A Hot air rises up

Air is a mixture which is composed of several gases like oxygen 21%, nitrogen 78%, carbon dioxide 0.03% and water vapors. When air is heated up, the air molecules absorb the heat and its kinetic energy increases. Due to the increase in kinetic energy the hot air rises up.

In the given image, the air in the bottle gets heated up and rises due to increase in the kinetic energy of air molecules and thus the balloon gets inflated.

So, the correct answer is option A.