First Law Of Thermodynamics - Practice Questions & MCQ

Which of the following is incorrect regarding the first law of thermodynamics?

In a given process of an ideal gas dW=0 and dQ<0. Then for the gas

An ideal gas is taken via path as shown in figure. The net work done in the whole cycle is

First law of thermodynamics provides a relation between these quantities


 

The correct 1st law equation for the isothermal process will be

A total of $48 \mathrm{~J}$ heat is given to one mole of helium kept in a cylinder. The temperature of helium increases by $2^{\circ} \mathrm{C}$. The work done by the gas is : (Given, $\mathrm{R}=8.3 \mathrm{~J} \mathrm{~K}^{-1} \mathrm{~mol}^{-1}$.)

Direction:  In the following question, a statement of Assertion (A)  is followed by a statement of reason (R). Mark the correct choice as: 

Assertion: First law of thermodynamics states that energy is conserved.

Reason: According to the first laws of thermodynamics SW=SQ+dv

A thermodynamic system of mono-atomic gas uses half of the heat given in work done. Find out the process equation.
 

During the melting of a slab of ice at 273 K at atmospheric pressure :