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Q.

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

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Start JEE / NEET / Foundation preparation at rupees 99/day !!

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An Intiative by Sri Chaitanya

a

$ΔU = W_{adiabatic}$

b

$W_{ad} = + ve$ , when work is done on the system

c

$W_{ad} = - ve$ , when work is done by 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 = W_ad

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

work done on the system = +ve ;

W_ad = +ve as change in internal energy is positive

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