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
The instantaneous values of alternating current and voltages in a circuit are given as
→$ I= \frac{1}{{\sqrt 2 }} sin \left( {100\pi t} \right)$
$E=\frac{1}{\sqrt{2}} \sin (100 \pi t+\pi / 3)$
The average power in watts consumed in the circuit is
The phase difference between two $SHM\,\,$ ${y_1}\, = \,10\,\sin \,\left( {10\pi t\, + \,\frac{\pi }{3}} \right)$ and ${y_2}\, = \,12\,\sin \,\left( {8\pi t\, + \,\frac{\pi }{4}} \right)$ at $t = 0.5\,s$ it
→A wooden block of mass $M$ resting on a rough horizontal surface is pulled with a force $F$ at an angle $\phi $ with the horizontal. If $\mu $ is the coefficient of kinetic friction between the block and the surface, then acceleration of the block is
→$A$ ball of mass $m = 60gm$ is shot with speed $v_0 = 22m/s$ into the barrel of spring gun of mass $M = 240g$ initially at rest on $a$ frictionless surface. The ball sticks in the barrel at the point of maximum compression of the spring. What fraction of initial kinetic energy of the ball is now stored in the spring?
→Energy conversion in a photoelectric cell takes place from
A thin film of water $(\mu=4 / 3)$ is $3100 \,\mathring A$ thick. If it is illuminated by white light at normal incidence. The colour of film in the reflected light will be
→A galvanometer with a resistance of $12 \,\Omega$ gives full scale deflection when a current of $3\, mA$ is passed. It is required to convert it into a voltmeter which can read up to $18\, V$. the resistance to be connected is ............... $\Omega $
→$A$ thin lens with focal length $f$ to be used as a magnifying glass. Which of the following statements regarding the situation is true?
→The forbidden energy gap in $Ge$ is $0.72\,eV.$ Given, $hc = 12400\,eV -\mathop A\limits^o $. The maximum wavelength of radiation the will generate electron electron hole pair is..........$\mathop A\limits^o $
→Hexamethylene tetramine is used as