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Q.

Which of the following statements / expressions is/are correct ?

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a

ΔU=Wadiabatic 

b

Wad=−ve, when work is done by the system

c

Wad=+ve, when work is done on the system

d

All of the above

answer is D.

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Detailed Solution

from first law of thermodynamics

 ∆E =q + w

for adiabatic process q = 0; ∆E = Wad

work done by system = - ve ;Wad = -Ve as change in internal energy is negative 

work done on the system = +ve ; 

Wad = +ve as change in internal energy is positive

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