Question

Choose the correct statement(s):
A. According to the first law of thermodynamics, when energy is put to work, a part of it is always converted to non-useful form such as heat, mainly due to friction and radiation.
B. According to the second law of thermodynamics, energy can be transformed from one form to another, but it can neither be created nor destroyed.
(a) Both (A) and (B)
(b) only (B)
(c) only (A)
(d) None of these

  • Category: Heat and Energy ICSE Class 9
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Answer

None of these

Reason — The laws of thermodynamics are stated below:

  1. First law of thermodynamics (Law of conservation of energy) — Energy can be transformed from one form to another form, but it can neither be created nor destroyed.
  2. Second law of thermodynamics — When energy is put to work, a part of it is always converted in unuseful form mainly as heat, due to friction and radiation.

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