Previous year MCQs

General science UPPSC 2009 GS-I
Question

Assertion (A): Lighting a candle in space does not produce a flame.
Reason (R): A flame exists due to the pull of gravity.

In the context of the above, which one of the following is correct?

Answer & Solution

Answer: (Detailed Solution Below)

Option A: Both (A) and (R) are true and (R) is the correct explanation of (A).

Detailed Solution:

The correct answer is “Both (A) and (R) are true and (R) is the correct explanation of (A).”.
In a microgravity environment in space, a flame can be generated by burning a candle, but it is not possible in a true vacuum. The flame behaves differently due to the absence of gravitational force in space.

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