The first law of thermodynamics can be writte | vedclass

Name: Exam Paper Generator | JEE NEET Paper Generator | Vedclass
Brand: Vedclass
Rating: 5 (35 reviews)

Question

(C) The first law of thermodynamics is given as $\Delta U = \Delta Q + \Delta W$. In this convention,$\Delta W$ represents the work done $ON$ the gas.

Vedclass · Accepted Answer

$\Delta U$ is zero when heat is supplied and the temperature stays constant.

Vedclass · Answer

(C) The first law of thermodynamics is given as $\Delta U = \Delta Q + \Delta W$. In this convention,$\Delta W$ represents the work done $ON$ the gas. For option $A$: If no heat enters or leaves,$\Delta Q = 0$,so $\Delta U = \Delta W$. Thus,$\Delta U$ is not necessarily zero. For option $B$: In the equation $\Delta U = \Delta Q + \Delta W$,$\Delta W$ is the work done on the gas,not by the gas. For option $C$: For an ideal gas,internal energy $\Delta U$ is a function of temperature only,i.e.,$\Delta U = nC_v \Delta T$. If the temperature remains constant,$\Delta T = 0$,which implies $\Delta U = 0$. This statement is correct. For option $D$: If temperature increases,$\Delta U 
eq 0$,so $\Delta Q + \Delta W 
eq 0$.

The first law of thermodynamics can be written as $\Delta U = \Delta Q + \Delta W$ for an ideal gas. Which of the following statements is correct?

Similar Questions

$A$ diatomic gas has an initial internal energy of $80 cal$. $A$ work of $18 cal$ is done on the gas and the gas releases heat energy of $42 J$. The final internal energy of the gas is

The increase in internal energy of $2$ moles of gas when its temperature is raised from $340 \ K$ to $342 \ K$ is ........ $cal$. Given $C_v = 4.96 \ cal/mole \ K$.

If a system undergoes contraction of volume,then the work done by the system will be:

When heat energy of $1500 \; J$ is supplied to a gas at a constant pressure of $2.1 \times 10^5 \; N/m^2$,its volume increases by $2.5 \times 10^{-3} \; m^3$. The increase in the internal energy of the gas in Joules is ...... $J$.

Vedclass Test Series

Exam Paper Generator

Online Exam Module