For the Assertion (A) and Reason (R) below, choose the correct alternative

Question

For the Assertion (A) and Reason (R) below, choose the correct alternative

Assertion (A): Simla is colder than Delhi.

Reason (R): Simla is at a higher altitude as compared to Delhi.

1. A. Both A and R are true and R is the correct explanation of A. (Correct answer)
2. B. Both A and R are true but R is NOT the correct explanation of A.
3. C. A is true but R is false.
4. D. A is false but R is true.

Correct Answer

Option A — Both A and R are true and R is the correct explanation of A.

Detailed Solution & Explanation

The correct answer is Both A and R are true and R is the correct explanation of A.

Key Points

• Assertion (A) is true: Shimla is indeed colder than Delhi.
• Reason (R) is true: Shimla sits at roughly 2,200 m above sea level, while Delhi is at about 215 m.
• R also explains A. Temperature falls with altitude at roughly 6.5°C per 1,000 m (the normal lapse rate), so a difference of about 2,000 m accounts for the colder climate.
• Since both statements are true and the second genuinely accounts for the first, option A is correct.

Additional Information

• The underlying cause is that air expands and cools as atmospheric pressure drops with height — adiabatic cooling.
• In assertion-reason questions, always ask the second question separately: not just "are both true?" but "does the reason *cause* the assertion?" Two true but unrelated statements would call for option B.