SSC MTS EXAM

Detailed explanation-1: -When two objects have different temperatures, heat is transferred. The cooler object gets warmer until the two objects have the same temperature. Heat energy always flows from the warmer object to the cooler object.

Detailed explanation-2: -The transfer of heat goes from the hot object to the cold object. We can imagine a system, however, in which the heat is instead transferred from the cold object to the hot object, and such a system does not violate the first law of thermodynamics.

Detailed explanation-3: -Explanation. Radiation is a process of transfer of heat from a hot body to a cold body without heating the intervening medium. It is the fastest mode of transfer of heat.

Detailed explanation-4: -In other words, the process of transfer of heat between two bodies which are isolated from the environment is irreversible. The second law off thermodynamics says that not all processes which conserve energy, as required by the first law, occur in nature.