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

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

When $1<mspace\; width="1em"></mspace>\mathrm{kg}$ of ice at $0°\mathrm{C}$ melts to water at $0°\mathrm{C}$, the resulting change in its entropy, taking latent heat of ice to be $80<mspace\; width="1em"></mspace>\mathrm{cal}/\mathrm{g}$ is

1.  $273<mspace\; width="1em"></mspace>\mathrm{cal}/\mathrm{K}$

2.  $8<mspace\; width="1em"></mspace>\times <mspace\; width="1em"></mspace>{10}^4<mspace\; width="1em"></mspace>\mathrm{cal}/\mathrm{K}$

3.  $80<mspace\; width="1em"></mspace>\mathrm{cal}/\mathrm{K}$

4.  $293<mspace\; width="1em"></mspace>\mathrm{cal}/\mathrm{K}$

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

If for a given substance melting point is $T_B$ and freezing point is $T_A$, then correct variation shown by graph between entropy change and temperature is

1. 

2.

3.

4.