A sink, that is, the system where heat is rejected, is essential for the conversion of heat into work. From which law does the above inference follow?
1. Zeroth
2. First
3. Second
4. Third

Subtopic:  Second Law of Thermodynamics |
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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 |
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When 1kg of ice at 0°C melts to water at 0°C, the resulting change in its entropy, taking latent heat of ice to be 80cal/g is

1.  273cal/K

2.  8×104cal/K

3.  80cal/K

4.  293cal/K

Subtopic:  Second Law of Thermodynamics |
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Assertion Thermodynamic process in nature are irreversible. 
Reason Dissipative effects cannot be eliminated.
 

1.  If both assertion and reason are true and reason explain the assertion.
2.  If both the assertion and reason are true but reason does not explain the assertion.
3.  If assertion is true but reason is false.
4.  If assertion is false but reason is true.

Subtopic:  Second Law of Thermodynamics |
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When \(1\) kg of ice at \(0^{\circ}\) C melts into the water at \(0^{\circ}\) C, the resulting change in its entropy, taking the latent heat of ice to be \(80\) cal/gm, is:
1. \(8\times 10^4\) cal/K
2. \(80\) cal/K
3. \(293\) cal/K
4. \(273\) cal/K

Subtopic:  Second Law of Thermodynamics |
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If for a given substance melting point is TB and freezing point is TA, then correct variation shown by graph between entropy change and temperature is

1. 

2.

3.

4. 

Subtopic:  Second Law of Thermodynamics |
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Which of the following thermodynamic quantities is an outcome of the second law of thermodynamics ?

1. Work

2. Enthalpy

3. Internal energy

4. Entropy

Subtopic:  Second Law of Thermodynamics |
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Consider a cycle followed by an engine (figure). 


1 to 2 is isothermal,
2 to 3 is adiabatic,
3 to 1 is adiabatic.
Such a process does not exist, because:

(a) heat is completely converted to mechanical energy in such a process, which is not possible.
(b) In this process, mechanical energy is completely converted to heat, which is not possible.
(c) curves representing two adiabatic processes don’t intersect.
(d) curves representing an adiabatic process and an isothermal process don't intersect.

Choose the correct alternatives:

1. (a), (b) 2. (a), (c)
3. (b), (c) 4. (c), (d)
Subtopic:  First Law of Thermodynamics | Second Law of Thermodynamics |
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