First Law Of Thermodynamics - Practice Questions & MCQ

First law of thermodynamics - 

According to it heat given to a system (Q) is equal to the sum of increase in its internal energy (U) and the work done (W) by the system against the surroundings.

                                              or For cyclic process

Drawback of First law of thermodynamics -

• First law of thermodynamics does not tell us reason about the direction of heat transfer.

Important points - 

1. Q and W are the path functions but U is the point function.

2. First law of thermodynamics introduces the concept of internal energy.