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One mole of an ideal diatomic gas undergoes a transition from A to B along a path AB as shown in the figure.

The change in internal energy of the gas during the transition is

(a) 20 kJ

(b) -20 kJ

(c) 20 J

(d) -12 kJ

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The specific heat of a gas in an isothermal process is -

(1) Infinite

(2) Zero

(3) Negative

(4) Remains constant

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When an ideal diatomic gas is heated at constant pressure, the fraction of the heat energy supplied which increases the internal energy of the gas, is -

(1) 25

(2) 35

(3) 37

(4) 57

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A mono atomic gas is supplied the heat Q very slowly keeping the pressure constant. The work done by the gas will be 

(1) 23Q

(2) 35Q

(3) 25Q

(4) 15Q

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