Question

State the mode/different modes, of heat transfer in the following :- (1)- A paper cup, full of hot soup, laying on a table .
(2)- Cooking vegetables in a pan .
(3)- Melting of a chocolate bar, in the school bag, on ahot day. (4)- Cooking food in a micro wave oven .

Answer 1

are u studying in DAV?
1.Convention, Radiation
2.Radiation
3.Conduction

Answer 2

Answer:

The mode of heat transfer is as follows:

(1) A paper cup, full of hot soup, laying on a table - convection

It is usually the mode of heat transfer in liquids and gases.

(2) Cooking vegetables in a pan- conduction

The pan, which is in direct contact with the heat source, transfers the heat to the vegetables.

(3)- Melting of a chocolate bar, in the school bag, on a hot day- conduction

Conduction of heat takes place from the surroundings to the bag and finally to the chocolate.

(4) Cooking food in a microwave oven- Radiation

It is the mode of heat transfer in which there's no direct contact between the heat source and the molecules to be heated.