During an adiabatic process. the pressure of a gas is found to be proportional to the cube of its
temperature. The ratio of CP/CV for the gas is

(a) 4/3

(b) 2

(c) 5/3

(d) 3/2

Concept Questions :-

Molar Specific heat
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A thermodynamic system is taken through the cycle ABCD as shown in figure. Heat rejected by the gas during the cycle is 

(a)2 pV                                     (b)4 pV

(c)12pV                                    (d)pV

Concept Questions :-

First law of thermodynamics
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One mole of an ideal gas from an initial state B undergoes via two processes. It first undergoes isothermal expansion from volume V to 3V and then its volume is reduced from 3V to V at constant pressure. The correct p-V diagram representing the two processes is -

Concept Questions :-

Types of processes
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An ideal gas goes from state A to state B

via three different processes as indicated 

in the p-V diagram

If Q1, Q2, Q3 indicates the heat absorbed

by the gas along the three processes and 

U1, U2, U3 indicates the change in 

internal energy along the three processes

respectively, then

(a) Q1>Q2>Q3 and U1= U2= U3

(b) Q3>Q2>Q1 and U1= U2= U3

(c) Q1=Q2=Q3 and U1>U2>U3

(d) Q3>Q2>Q1 and U1>U2>U3

Concept Questions :-

First law of thermodynamics
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A mass of diatomic gas (γ=1.4) at a pressure of 2 atm is compressed adiabatically so that its temperature rise from 27°C to 927°C. The pressure of the gas is final state is-

(a) 28 atm                                            (b) 68.7 atm

(c) 256 atm                                           (d) 8 atm

Concept Questions :-

Types of processes
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If U and W represent the increase in internal energy and work done by the system respectively in a thermodynamical process,which of the following is true?

(a) U=-W, in a adiabatic process

(b) U=W, in a isothermal process

(c) U=W, in adiabatic process

(d) U=-W,in a isothermal process 

Concept Questions :-

Types of processes
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A monoatomic gas at pressure p1 and V1 is compressed adiabatically to 18th its original volume. What is the final pressure of the gas ?

(a) 64 p1                                   (b) p1

(c) 16 p1                                    (d) 32 p1

Concept Questions :-

Types of processes
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The internal energy change in a system that has absorbed 2 kcal of heat and done 500 J of work is 

(a) 8900 J                                      (b) 6400 J

(c) 5400 J                                      (d) 7900 J

Concept Questions :-

First law of thermodynamics
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In thermodynamic processes which of the following statements is not true?

(a) In an adiabatic process the system is insulated from the surroundings

(b) In an isochoric process pressure remains constant

(c) In an isothermal process the temperature remains constant

(d) In an adiabatic process pVγ=constant

Concept Questions :-

Types of processes
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If Q, E and W denote respectively the heat added, change in internal energy and the work done in a closed cyclic process, then

(a) W=0                                  (b) Q=W=0

(c) E=0                                   (d) Q=0

Concept Questions :-

Cyclic process
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