1.

Match the following : The correct answer is

Answer»

A - V, B - I, C - II, D - III
A-I, B- III, C - II, D - IV
A - II, B - V, C - III, D - I
A - II, B - V, C - I, D - III

Solution :The CORRECT match is
`II rarr A, V rarr B, III rarr C, I rarr D`.
Their explanations are as follows :
`(D) rarr I`
In an isothermal reversible EXPANSION
`DELTA T = 0`
`Delta U = C_(V) , Delta T = 0`
`(A) rarr II`
If wall is adiabatic then
`q = 0`
From first law of thermodynamics
`Delta U = q + W`
`:. Delta U = W_("adiabatic")`
`(C ) rarr III`
For thermally conducting walls
`Delta U = -q`
`(B) rarr V`
For close system
`q != 0, w != 0` and `W = -ve`
From first law of thermodynamics
`Delta U = q - W`


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