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

(1) Infinite

(2) Zero

(3) Negative

(4) Remains constant

Concept Questions :-

Molar Specific heat
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The latent heat of vaporisation of water is 2240 J/gm. If the work done in the process of expansion of 1 g is 168 J, then increase in internal energy is 

(1) 2408 J

(2) 2240 J

(3) 2072 J

(4) 1904 J

Concept Questions :-

First law of thermodynamics
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A cylinder fitted with a piston contains 0.2 moles of air at temperature 27°C. The piston is pushed so slowly that the air within the cylinder remains in thermal equilibrium with the surroundings. Find the approximate work done by the system if the final volume is twice the initial volume 

(1) 543 J

(2) 345 J

(3) 453 J

(4) 600 J

Concept Questions :-

Work done by gas
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If a cylinder containing a gas at high pressure explodes, the gas undergoes -

(1) Reversible adiabatic change and fall of temperature

(2) Reversible adiabatic change and rise of temperature

(3) Irreversible adiabatic change and fall of temperature

(4) Irreversible adiabatic change and rise of temperature

Concept Questions :-

First law of thermodynamics
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The work done in an adiabatic change in a gas depends only on

(1) Change is pressure

(2) Change is volume

(3) Change in temperature

(4) None of the above

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In adiabatic expansion 

(1) ΔU = 0

(2) ΔU = negative

(3) ΔU = positive

(4) ΔW = zero

Concept Questions :-

First law of thermodynamics
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A monoatomic gas (γ=5/3) is suddenly compressed to 18 of its original volume adiabatically, then the pressure of the gas will change to -

(1) 245

(2) 8

(3) 403

(4) 32 times its initial pressure

Concept Questions :-

Types of processes
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The pressure and density of a diatomic gas (γ=7/5) change adiabatically from (P, d) to (P', d'). If d'd=32, then P'P should be 

(1) 1/128

(2) 32

(3) 128

(4) None of the above

Concept Questions :-

Types of processes
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An ideal gas at 27°C is compressed adiabatically to 827 of its original volume. If γ=53, then the rise in temperature is

(1) 450 K

(2) 375 K

(3) 225 K

(4) 405 K

Concept Questions :-

Types of processes
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Two identical samples of a gas are allowed to expand (i) isothermally (ii) adiabatically. Work done is 

(1) More in the isothermal process

(2) More in the adiabatic process

(3) Neither of them

(4) Equal in both processes

Concept Questions :-

Work done by gas
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