Question

Assertion (A): Drainage increases the soil temperature.
Reason (R): Drainage decreases the heat capacity.

• A. Both (A) and (R) are correct and (R) is the correct explanation of (A).
• B. Both (A) and (R) are correct but (R) is NOT the correct explanation of (A).
• C. (A) is correct but (R) is not correct.
• D. (A) is not correct but (R) is correct.

Hint:

In assertion-reason questions, ensure that both statements are not only correct but logically connected.

Answer 1

The Correct Option is A

Step 1: Temperature rise follows \( \Delta T = \dfrac{Q}{mc} \), where \( c \) is specific heat capacity.
Step 2: Drained soil holds less water, so its effective heat capacity \( C \) drops.
Step 3: Lower \( C \) means a bigger \( \Delta T \) for the same heat input, so soil warms faster.
Correct option: Both (A) and (R) are correct and (R) is the correct explanation of (A).