18. When a gas expands adiabatically
(a) No energy is required for expansion
(b) Energy is required and it comes from the wall of the container of the gas
(c) Internal energy of the gas is used in doing work
(d) Law of conservation of energy does not hold
Answer-c
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(a) – 5 J (b) – 10 J (c) – 15 J (d) – 20 J Answer-a