55. An ideal gas is initially at is expanded to and then compressed adiabatically to the same volume and pressure . If W is the net work done by the gas in complete process which of the following is true

a) b)

c) d)

Ans : b)

56. A wire of length and radius . Maximum percentage error in density is

a) 4 b) 2

c) 1 d) 6.8

Ans : a)

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