Transfer of heat from a body at low temperature to a body at high temperature
(a) is impossible
(b) is possible by keeping both the bodies in contact
(c) is possible by doing some external work
(d) none of these
Answers
"(c) is possible by doing some external work"
Explanation:
Heat will just move from a body at higher temperature to a body at a lower temperature. It is beyond the possibilities to expect to have a situation where the hotness streams from the room at 25° c to some tea at 80° C and hotness it considerably further.
Fridge is an illustration of that.
It can do this because it's anything but a shut framework. The manner in which it isn't shut is that it has energy input, that drives the siphon. The air outside is doubly warmed - by the hotness eliminated from the case, and by the fieriness of the energy that drives the siphon. This is an illustration of a heated motor.
The actual earth is a hotness motor, taking energy from the sun (sweltering) and transmitting it to space (cold). It can utilize that energy to diminish entropy locally, driving normal frameworks.