question_answer

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.           [AIIMS 2003]

A)             If both assertion and reason are true and the reason is the correct explanation of the assertion.

B)             If both assertion and reason are true but reason is not the correct explanation of the assertion.

C)             If assertion is true but reason is false.

D)             If the assertion and reason both are false.

E)             If assertion is false but reason is true.

Correct Answer: C

Solution :

                   Heat is carried away from a fire sideways mainly by radiations. Above the fire, heat is carried by both radiation and by convection of air. The latter process carries much more heat.