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Important questions on Convection

HARD
Assertion

Though air is a bad conductor yet a body kept in air loses heat quickly.

Reason

The heat loss is mainly due to radiation.

A

Both Assertion and Reason are correct and Reason is the correct explanation for Assertion

B

Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion

C

Assertion is correct but Reason is incorrect

D

Both Assertion and Reason are incorrect

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HARD

Which of the following process(es) occur(s) during the convective transfer of heat within a large volume of air? 

This question has multiple correct options
A

A continuous flow of warmer and cooler parts of air is established.

B

The flow of air molecules results in flow of heat.

C

The cooler portion of the air surrounding a warmer part exerts a buoyant force on it.

D

As the warmer part of the air moves, it is replaced by cooler air that is subsequently warmed up.

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