Question

The given indicator diagram shows variation of
pressure with volume, when a thermodynamical
system is taken from state A to state B. During
the process

(1) The system is cooled
(2) The system is heated
(3) The system heated first and then cooled
(4) The system cooled first and then heated​

Answer 1

Answer: 3

Explanation: here the question is asking about the temperature..

See the attachment

Answer 2

During the process from state A to state B, system is cooled. Means option first is correct.

Explanation:

1. From figure it is clear that pressure decrease on increasing volume.

2. Relation between pressure and volume is straight line with negative slope. So we can write

P = -a×V+b       ...1)

Here a and b is constant. Negative sign with is taken due to negative slope of graph.

3. Now from Ideal gas equation

P V = m R T     ...2)

4. Now from equation 1) and equation 2)

 (-a×V+b)×V= m R T  

 $T= -(\frac{a}{mR})V^{2}+(\frac{b}{mR})V$     ...3)

5. From equation 3) it is clear that relation between temperature and pressure is parabolic with opening downward.

So On increase in volume temperature will decrease, means it will cool.