Answer: Option A
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Modes: 1 Mark each
The various ways in which heat is transferred are:
(i) Conduction: In this mode, heat is transferred between adjacent molecules through vibration, without the actual movement of the molecules. This type of heat transfer happens in metals.
(ii) Convection: In air and water, heat is transferred by convection. The hot air becomes lighter and moves upward which is then replaced with the colder particles from the top and sides. In convection, the actual movement of molecules takes place.
(iii) Radiation: This mode of heat transfer doesn't require any medium for its transfer. All hot bodies radiate heat. When heat falls on an object, a part of it is absorbed, a part of it is reflected and a part of it is transmitted. The temperature of the body rises due to the absorbed part of the heat.