MCQ
For adiabatic process, wrong statement is
- A$dQ = 0$
- B$dU = - dW$
- C$Q =$ constant
- ✓Entropy is not constant
✓
Answer
Correct option: D.
Entropy is not constant
d
(d) For adiabatic process no heat is transferred hence $\mathrm{d} \mathrm{Q}=0$
(d) For adiabatic process no heat is transferred hence $\mathrm{d} \mathrm{Q}=0$
$\mathrm{du}=-\mathrm{d} \mathrm{w}$
As $\quad \mathrm{dQ}=0$ means $\mathrm{Q}$ is constant
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
Two spherical conductors $A$ and $B$ of radius $a$ and $b (b > a)$ are placed in air concentrically $B$ is given charge $+ Q$ coulomb and $A$ is grounded. The equivalent capacitance of these is
→The rectangular surface of area $8$ cm $ \times $ 4cm of a black body at a temperature of ${127^o}C$ emits energy at the rate of $E$ per second. If the length and breadth of the surface are each reduced to half of the initial value and the temperature is raised to ${327^o}C$, the rate of emission of energy will become
→The driver of a bus approaching a big wall notices that the frequency of his bus's horn changes from $420\, Hz$ to $490\, Hz ,$ when he hears it after it gets reflected from the wall. Find the speed of the bus (in $kmh^{-1}$) if speed of the sound is $330\, ms ^{-1}$.
→Find the end product of reaction
Product is
$A$ uniform cylinder rests on a cart as shown. The coefficient of static friction between the cylinder and the cart is $0.5$. If the cylinder is $4\, cm$ in diameter and $10\, cm$ in height, which of the following is the minimum acceleration of the cart needed to cause the cylinder to tip over ? ....... $m/s^2$.
→When the switch $S$, in the circuit shown, is closed, then the value of current $i$ will be ................. $A$
→A body of mass $1 \,\, kg$ is acted upon by a force $\vec F = 2\sin 3\pi t\,\hat i + 3\cos 3\pi t\,\hat j$ find its position at $t = 1 \,\, sec$ if at $t = 0$ it is at rest at origin.
→The volume of a gas at $20°C$ is $200\, ml$. If the temperature is reduced to $-20°C$ at constant pressure, its volume will be ...... $ml$
→A bullet of mass $25\,g$ moving with a velocity of $200\,m/s$ is stopped within $5\,cm$ of the target. The average resistance offered by the target is ............... $\mathrm{kN}$
→Two vectors $\vec A\,{\rm{ and }}\vec B$ are such that $\vec A + \vec B = \vec A - \vec B$. Then
→