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An ideal monoatomic gas is confined in a horizontal cylinder by a spring loaded piston (as shown in the figure). Initially the gas is at temperature T1, pressure P1 and volume V1 and the spring is in its relaxed state. The gas is then heated very slowly to temperature T2, pressure P2 and volume V2. During this process, the piston moves out by a distance x. Ignoring the friction between the piston and the cylinder, the correct statement(s) is(are)

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Important Questions on Thermodynamics

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A gas is enclosed in a cylinder with a movable frictionless piston. Its initial thermodynamic state at pressure pi=105 Pa and volume Vi=10-3 m3 changes to a final state at pf=132×105 Pa and Vf=8×10-3 m3 in an adiabatic quasi-static process, such that p3V5=constant. Consider another thermodynamic process that brings the system from the same initial state to the same final state in two steps: an isobaric expansion at pi followed by an isochoric (isovolumetric) process at volume Vf. The amount of heat supplied to the system in the two-step process is approximate,
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One mole of a monatomic ideal gas undergoes a cyclic process as shown in the figure (where V is the volume and T is the temperature). Which of the statements below is (are) true ?

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One mole of a monatomic ideal gas undergoes an adiabatic expansion in which its volume becomes eight times its initial value. If the initial temperature of the gas is 100 K and the universal gas constant 8.0J mol1K1 , the decrease in its internal energy, in Joule, is__________.
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Two rigid boxes containing different ideal gases are placed on a table. The boxes are then put into thermal contact with each other, and heat flows between them until the gases reach a common final temperature (ignore the heat capacity of boxes). Box A contains one mole of nitrogen at temperature T0, while box B contains one mole of helium at temperature 73 T0. Then the final temperature of the gases, Tf in terms of T0 is

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The work of 146 kJ is performed in order to compress one-kilo mole of gas adiabatically and in this process the temperature of the gas increases by 7C. The gas is R=8.3 J mol-1 K-1 : 

 

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A Carnot engine, having the efficiency of η=110 as heat engine, is used as a refrigerator. If the work done on the system is 10 J, the amount of energy absorbed from the reservoir at a lower temperature is 
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If Cp and CV denote the specific heats of nitrogen per unit mass at constant pressure and constant volume respectively, then 
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When a system is taken from state i to state f along the path iaf, it is found that Q=50 cal and W=20 cal. Along the path ibf Q=36 cal. W along the path ibf is

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