A) 40 J
B) 110 J
C) 150 J
D) 260 J
Correct Answer: A
Solution :
Key Idea: Conservation of energy is valid here. From the first law of thermodynamics if an amount of heat Q is given to a system a part of it is used in increasing the internal energy \[(\Delta U)\] of the system and the rest in doing work (W) by the system. \[\therefore \] \[Q=\Delta U+W\] \[\Rightarrow \] \[\Delta U=Q-W\] \[\Delta U=150-110=40\,J\] Note: First law of thermodynamics is a form of the law of conservation of energy.
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