23. If ΔQ and ΔW represent the heat supplied to the system and the work done on the system respectively, then the first law of thermodynamics can be written as
(a) ΔQ= ΔU + ΔW (b) ΔQ= ΔU – ΔW
(c) ΔQ= ΔW-ΔU (d) ΔQ= – ΔW-ΔU
Ans. b
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(a) – 5 J (b) – 10 J (c) – 15 J (d) – 20 J Answer-a