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-

(1) 28 atm                                           

(2) 68.7 atm

(3) 256 atm                                           

(4) 8 atm

Subtopic:  Types of Processes |
 66%
From NCERT
NEET - 2011
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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?

(1) U=-W, in a adiabatic process

(2) U=W, in a isothermal process

(3) U=W, in adiabatic process

(4) U=-W,in a isothermal process 

Subtopic:  Types of Processes |
 79%
From NCERT
NEET - 2010
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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 ?

(1) 64 p1                                   

(2) p1

(3) 16 p1                                   

(4) 32 p1

Subtopic:  Types of Processes |
 72%
From NCERT
NEET - 2010
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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 

(1) 8900 J                                     

(2) 6400 J

(3) 5400 J                                     

(4) 7900 J

Subtopic:  First Law of Thermodynamics |
 73%
From NCERT
NEET - 2009
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In thermodynamic processes, which of the following statements is not true?

1. In an adiabatic process, the system is insulated from the surroundings.
2. In an isochoric process, the pressure remains constant.
3. In an isothermal process, the temperature remains constant.
4. In an adiabatic process, \(P V^\gamma\) = constant.

Subtopic:  Types of Processes |
 90%
From NCERT
NEET - 2009
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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

(1) W=0                                 

(2) Q=W=0

(3) E=0                                   

(4) Q=0

Subtopic:  Cyclic Process |
 74%
From NCERT
NEET - 2008
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The specific heat at constant pressure and at constant volume for an ideal gas are Cp and Cv and its adiabatic and isothermal elasticities are E andEθ  respectively. The  ratio of E to Eθ is

(1) Cv/Cp

(2) Cp/Cv

(3) CpCv

(4) 1/CpCv

Subtopic:  Types of Processes |
 80%
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If the volume of the given mass of a gas is increased four times and the temperature is raised from 27°C to 127°C. The isothermal elasticity will become

(1) 4 times                               

(2) 1/4 times

(3) 3 times                               

(4) 1/3 times

Subtopic:  Types of Processes |
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A system performs work ΔW when an amount of heat is ΔQ added to the system, the corresponding change in the internal energy is ΔU. A unique function of the initial and final states (irrespective of the mode of change) is -

(1) ΔQ

(2) ΔW

(3) ΔU and ΔQ

(4) ΔU

Subtopic:  First Law of Thermodynamics |
 77%
From NCERT
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A container of volume 1m3 is divided into two equal compartments by a partition. One of these compartments contains an ideal gas at 300 K. The other compartment is vaccum. The whole system is thermally isolated from its surroundings. The partition is removed and the gas expands to occupy the whole volume of the container. Its temperature now would be -

(1) 300 K

(2) 239 K

(3) 200 K

(4) 100 K

Subtopic:  First Law of Thermodynamics |
 79%
From NCERT
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