First law thermodynamics states that

(1) System can do work

(2) System has temperature

(3) System has pressure

(4) Heat is a form of energy

Subtopic:  First Law of Thermodynamics |
 75%
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A thermo-dynamical system is changed from state (P1, V1) to (P2, V2) by two different process. The quantity which will remain same will be

(1) ΔQ

(2) ΔW

(3) ΔQ + ΔW

(4) ΔQ – ΔW

Subtopic:  First Law of Thermodynamics |
 78%
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If ΔQ and ΔW represent the heat supplied to the system and the work done on the system respectively, then the first law of thermodynamics can be written as 

(1) ΔQ = ΔU + ΔW

(2) ΔQ = ΔU – ΔW

(3) ΔQ = ΔW – ΔU

(4) ΔQ = –ΔU – ΔW

where ΔU is the internal energy

Subtopic:  First Law of Thermodynamics |
 55%
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Which of the following can not determine the state of a thermodynamic system?

1. pressure and volume
2. volume and temperature
3. temperature and pressure
4. any one of pressure, volume, or temperature

Subtopic:  Basic Terms |
 79%
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Which of the following is not a thermodynamics co-ordinate ?

(1) P

(2) T

(3) V

(4) R

Subtopic:  Basic Terms |
 94%
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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%
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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%
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