Q.

A liquid when kept inside a thermally insulated closed vessel at 25° C was mechanically stirred from outside. What will be the correct option for the following thermodynamic parameters?

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a

ΔU=0,q<0,w>0

b

ΔU<0,q=0,w>0

c

ΔU>0,q=0,w>0

d

ΔU=0,q=0,w=0

answer is A.

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Detailed Solution

Thermally insulated ⇒q=0 from Ist law
ΔU=q+w

ΔU=w

w>0,ΔU>0

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