Question

Assertion (A): The smoke always rises.

Reason (R): Smoke is lighter than air.

पर्याय

• Both A and R are true, and R is the correct reason for A.

• Both A and R are true, but R is not the correct reason for A.

• A is true, and R is false.

• A is false, and R is true.

Answer 1

A is true, and R is false.

Explanation:

Assertion (A) that smoke always rises is true because smoke is carried upwards by the rising hot air (convection currents).
The reason (R) that smoke is lighter than air is false because smoke consists of solid particles and gases, which are not necessarily lighter than air. The smoke rises primarily due to the upward movement of hot air, not because it is lighter than air. Thus, the smoke rises because it is carried by the hot air moving upward, not because smoke itself is lighter than air.