VIT - VITEEE 2025
National level exam conducted by VIT University, Vellore | Ranked #11 by NIRF for Engg. | NAAC A++ Accredited | Last Date to Apply: 31st March | NO Further Extensions!
First law of Thermodynamics is considered one of the most asked concept.
44 Questions around this concept.
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
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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
National level exam conducted by VIT University, Vellore | Ranked #11 by NIRF for Engg. | NAAC A++ Accredited | Last Date to Apply: 31st March | NO Further Extensions!
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A thermodynamic system of mono-atomic gas uses half of the heat given in work done. Find out the process equation.
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.
$$
\Delta Q=\Delta U+\Delta W
$$
or For cyclic process
$$
\sum \Delta Q=\sum \Delta W
$$
Drawback of First law of thermodynamics -
Important points -
Q and W are the path functions but U is the point function.
First law of thermodynamics introduces the concept of internal energy.
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