MCQ
When a gas expands adiabatically
- ANo energy is required for expansion
- BEnergy is required and it comes from the wall of the container of the gas
- ✓Internal energy of the gas is used in doing work
- DLaw of conservation of energy does not hold
✓
Answer
Correct option: C.
Internal energy of the gas is used in doing work
c
(c) $\Delta Q = \Delta U + \Delta W = 0$ ==> $\Delta W = - \Delta U$
if $\Delta W$ is positive i.e., gas does work then $\Delta U$ should be negative meaning internal energy is used in doing work.
(c) $\Delta Q = \Delta U + \Delta W = 0$ ==> $\Delta W = - \Delta U$
if $\Delta W$ is positive i.e., gas does work then $\Delta U$ should be negative meaning internal energy is used in doing work.
Need a full question paper?
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.
Explore more
Similar questions
Given below are two statements :
→Statement$-I:$ Acceleration due to gravity is different at different places on the surface of earth.
Statement$-II:$ Acceleration due to gravity increases as we go down below the earth's surface.
In the light of the above statements, choose the correct answer from the options given below
The temperature of a gas is $-50^{\circ}\,C$. To what temperature the gas should be heated so that the rms speed is increased by $3$ times?
→The centre of mass of a non uniform rod of length $L$ whose mass per unit length $\lambda $ varies as $\lambda \ =\ \frac{{k\,.\,{x^3}}}{L}$ where $k$ is a constant & $x$ is the distance of any point on rod from its one end, is at distance (from the same end)
→A travelling wave is partly reflected and partly transmitted from a rigid boundary. Let $a_i, a_r$ and $a_t$ be the amplitude of incident wave, reflected wave and transmitted wave and $I_i, I_r$ and $I_t$ be the corresponding intensities. Then choose the correct alternatives
→Out of following four dimensional quantities, which one quantity is to be called a dimensional constant
$A$ block of mass $m$ moving with a velocity $v_0$ on a smooth horizontal surface strikes and compresses a spring of stiffness $k$ till mass comes to rest as shown in the figure. This phenomenon is observed by two observers:
→$A$: standing on the horizontal surface
$B$: standing on the block
To an observer $A$, the work done by spring force is 
A motor drives a body along a straight line with a constant force. The power $P$ developed by the motor must vary with time $t$ according to
→If the ratio of specific heat of a gas at constant pressure to that at constant volume is $\gamma $, the change in internal energy of a mass of gas, when the volume changes from $V$ to $2V$ constant pressure $ p$, is
→A wave equation is $y = 10^{-4}\, sin\, (60 t + 2x)$ Where $x$ and $y$ are in $metres$ and $t$ is in $sec$ . Which of the following statements is correct ?
→Force acting on a body varies with time as shown below. If initial momentum of the body is $\vec{p}$, then the time taken by the body to retain its momentum $\vec{p}$ again is ........... $s$
→