In an isothermal change, an ideal gas obeys:
1. Boyle's law
2. Charles law
3. Gay-Lussac law
4. None of the above

Subtopic:  Basic Terms |
 87%
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Under isothermal conditions, the volumes of ideal gas A and actual gas B grow from V to 2 V. The increase in internal energy:

1. will be the 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.



 

Subtopic:  Molar Specific Heat |
From NCERT
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The specific heat of a gas in an isothermal process is: 
1. Infinite
2. Zero
3. Negative
4. Remains constant

Subtopic:  Molar Specific Heat |
 69%
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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

Subtopic:  First Law of Thermodynamics |
 82%
From NCERT
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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

Subtopic:  Work Done by a Gas |
 65%
From NCERT
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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

Subtopic:  First Law of Thermodynamics |
 58%
From NCERT
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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

Subtopic:  Work Done by a Gas |
 68%
From NCERT
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In adiabatic expansion 

(1) ΔU = 0

(2) ΔU = negative

(3) ΔU = positive

(4) ΔW = zero

Subtopic:  First Law of Thermodynamics |
 72%
From NCERT
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The pressure and density of a diatomic gas (γ=7/5) changes 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
Subtopic:  Types of Processes |
 67%
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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

Subtopic:  Types of Processes |
 76%
From NCERT
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