The second law of thermodynamics states that in a cyclic process:

1. Work cannot be converted into heat

2. Heat cannot be converted into work

3. Work cannot be completely converted into heat

4. Heat cannot be completely converted into work

Subtopic:  Second Law of Thermodynamics |
 55%
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In a thermodynamic process, pressure of a fixed mass of a gas is changed in such a manner that the gas molecules absorb 30 J of heat and 10 J of work is done by the gas. If the initial internal energy of the gas was 40 J, then the final internal energy will be -

(1) 30 J

(2) 20 J

(3) 60 J

(4) 40 J

Subtopic:  First Law of Thermodynamics |
 74%
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First law of thermodynamics is a special case of 

(1) Newton's law

(2) Law of conservation of energy

(3) Charle's law

(4) Law of heat exchange

Subtopic:  First Law of Thermodynamics |
 86%
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If the ratio of specific heat of a gas at constant pressure to that at constant volume is γ, the change in internal energy of a mass of gas, when the volume changes from V to 2V constant pressure p, is 

(1) R/(γ1)

(2) pV

(3) pV/(γ1)

(4) γpV/(γ1)

Subtopic:  First Law of Thermodynamics | Molar Specific Heat |
 67%
From NCERT
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A monoatomic gas of n-moles is heated from temperature T1 to T2 under two different conditions (i) at constant volume and (ii) at constant pressure. The change in internal energy of the gas is 

(1) More for (i)

(2) More for (ii)

(3) Same in both cases

(4) Independent of number of moles

Subtopic:  First Law of Thermodynamics |
 57%
From NCERT
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Can two isothermal curves cut each other

(1) Never

(2) Yes

(3) They will cut when temperature is 0°C

(4) Yes, when the pressure is critical pressure

Subtopic:  Types of Processes |
 72%
From NCERT
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A vessel containing 5 litres of a gas at 0.8 m pressure is connected to an evacuated vessel of volume 3 litres. The resultant pressure inside will be (assuming whole system to be isolated) 

(1) 4/3 m

(2) 0.5 m

(3) 2.0 m

(4) 3/4 m

Subtopic:  Types of Processes |
 51%
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For an isothermal expansion of a perfect gas, the value of ΔPP is equal -

(1) γ1/2ΔVV

(2) ΔVV

(3) γΔVV

(4) γ2ΔVV

Subtopic:  Types of Processes |
 65%
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If a gas is heated at constant pressure, its isothermal compressibility 

(1) Remains constant

(2) Increases linearly with temperature

(3) Decreases linearly with temperature

(4) Decreases inversely with temperature

Subtopic:  Types of Processes |
 56%
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In isothermal expansion, the pressure is determined by:

1. Temperature only
2. Compressibility only
3. Both temperature and compressibility
4. None of these


 

Subtopic:  Types of Processes |
 59%
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