Physics-
General
Easy
Question
P-V diagram of a cyclic process ABCA is as shown in figure. Choose the correct statement
= negative
= positive
= negative
- All of these
= negative
= positive
= negative
The correct answer is: All of these
During process A to B, pressure and volume both are decreasing. Therefore, temperature and hence, internal energy of the gas will decrease (T µ PV) or 
negative. Further 
is also negative as the volume of the gas is decreasing. Thus is negative.
In process B to C pressure of the gas is constant while volume is increasing. Hence temperature should increase or = positive. During C to A volume is constant while pressure is increasing. Therefore, temperature and hence, internal energy of the gas should increase or 
= positive. During process CAB volume of the gas is decreasing. Hence, work done by the gas is negative.
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