Q. In the question given below, there are two statements marked as Assertion (and Reason (R). Mark your answer as per the codes provided
Assertion (A): Smoke vortex structures can maintain their coherence and ascend vertically in the atmosphere for a prolonged duration.
Reason (R): The Coriolis force of the Earth is mainly responsible for their rotation.
Select the correct answer using the code below:
Answer: C
Notes:
Correct Answer: (c) A is correct, but R is incorrect
- Assertion (A) is correct- Smoke vortices (smoke rings) can remain stable and rise for a considerable time because their rotating motion creates a circular “shell” of spinning air. This rotating shell reduces mixing with surrounding air and helps the warm core rise upward.
- Reason (R) is incorrect- The Coriolis force (due to Earth’s rotation) is not the main reason for the rotation of smoke vortices. Smoke rings form due to local pressure differences, buoyancy, and fluid dynamics, not because of Earth’s rotation.
Source- TH
