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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
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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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