Question

A) Heat transfer by conduction and convection require a material medium.
B) Heat transfer by radiation doesn't require a material medium.

A

both A and B are true

B

A is true but B is false

C

B is true but A is false

D

both A and B are false

Easy
Solution
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Correct option is A)

Conduction and convection are processes where heat is transferred by the collision of molecules. Hence, for these processes to take place, we need a material medium.
In radiation, heat travels as electromagnetic waves which do not require a medium to travel. Its transfer mechanism is completely independent of the medium.

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