A sink, that is the system where heat is rejected, is essential for the conversion of heat into work. From which law the above inference follows?

(1) zeroth

(2) First

(3) Second

(4) Third

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. 

A Carnot engine having an efficiency of $\mathrm{\eta }=\frac{1}{10}$ as
heat engine is used as a refrigerator. If the work
done on the system is 10 J, then the amount of
energy absorbed from the sink at lower temperature
is
1. 100 J 

2. 99 J

3. 90 J 

4. 1 J