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HomePhysics23. 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

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

(8)

5/5 - (3 votes)

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12. An ideal gas is taken through the cycle A→ B → C → A, as shown in the figure. If the net heat supplied to the gas in the cycle is 5 J, the work done by the gas in the process C → A is

(a)      – 5 J (b)  – 10 J (c)   – 15 J (d)  – 20 J Answer-a (126)

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