JEE Main & Advanced
Physics
Thermodynamical Processes
Question Bank
Graphical Questions
question_answer
The P-V diagram of a system undergoing thermodynamic transformation is shown in figure. The work done by the system in going from \[A\to B\to C\]is 30J and 40J heat is given to the system. The change in internal energy between A and C is [BCECE 2005]
A) 10 J
B) 70 J
C) 84 J
D) 134 J
Correct Answer:
A
Solution :
Heat given DQ = 40 J and Work done DW = 30 J Þ DU = DQ ? DW = 40 ? 30 = 10 J.