Q.

It is hotter over top of the fire than at same distance on the sides due to

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a

Conduction

b

Convection

c

Radiation

d

All the above

answer is B.

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Detailed Solution

When temperature of a fluid is increased, average intermolecular separation increases, so its density decreases. This hot fluid moves upward creating vaccum, which is filled by cold fluid coming from all sides and top.  Hence option-(2) is right.
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It is hotter over top of the fire than at same distance on the sides due to