In an isothermal change, an ideal gas obeys -

(1) Boyle's law

(2) Charle's law

(3) Gaylussac law

(4) None of the above

Concept Questions :-

Basic terms
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An ideal gas A and a real gas B have their volumes increased from V to 2 V under isothermal conditions. The increase in internal energy

(1) Will be same in both A and B

(2) Will be zero in both the gases

(3) Of B will be more than that of A

(4) Of A will be more than that of B

Concept Questions :-

Types of processes
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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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Difficulty Level:

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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(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 $\left(\gamma =5/3\right)$ is suddenly compressed to $\frac{1}{8}$ of its original volume adiabatically, then the pressure of the gas will change to -

(1) $\frac{24}{5}$

(2) 8

(3) $\frac{40}{3}$

(4) 32 times its initial pressure

Concept Questions :-

Types of processes
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Difficulty Level:

The pressure and density of a diatomic gas $\left(\gamma =7/5\right)$ change adiabatically from (P, d) to (P', d'). If $\frac{d\text{'}}{d}=32$, then $\frac{P\text{'}}{P}$ should be

(1) 1/128

(2) 32

(3) 128

(4) None of the above

Concept Questions :-

Types of processes