In the following questions, Statement of assertion (A) is followed by a statement of reason (R). 1. If both assertion and reason are true and the reason is the correct explanation of the assertion, then mark. 2. If both assertion and reason are true but the reason is not the correct explanation of the assertion, then mark. 3. If assertion is true statement but reason is false, then mark. 4. If both assertion and reason are false statements then mark.
Assertion: It is hotter over the top of a fire than at the same distance on the sides. Reason: Air surrounding the fire conducts more heat upwards.A) 1
B) 2
C) 3
D) 4
Correct Answer: C
Solution :
A flame consists of gases so hot that they glow yellow, orange and red. Hot gases expand and become less dense than the surrounding air. Therefore, the flame is lighter than an equal volume of air. Hence, hot air rises because air expands when heated, becoming lighter or more buoyant than the cooler surrounding air.
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