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) $\Delta Q=\Delta U+\Delta W=0 \Rightarrow \Delta W=-\Delta U$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 gravitational force between two point masses $m_1$ and $m_2$ at separation $r$ is given by $F=k \frac{m_1 m_2}{r^2}$The constant $k$
→Two coils of self inductance $L_1$ and $L_2$ are placed closer to each other so that total flux in one coil is completely linked with other. If $M$ is mutual inductance between them, then
→A force of $750 \mathrm{~N}$ is applied to a block of mass $102 \mathrm{~kg}$ to prevent it from sliding on a plane with an inclination angle $30^{\circ}$ with the horizontal. If the coefficients of static friction and kinetic friction between the block and the plane are 0.4 and 0.3 respectively, then the frictional force acting on the block is
→For a triode, at $V_g=-1$ volt, the following observations were taken $V_p=75 V , I_p=2 mA , V_p=100 V , I_p=4 mA$. The value of plate resistance will be
→Two light sources with equal luminous intensity are lying at a distance of $1.2 \mathrm{~m}$ from each other. Where should a screen be placed between them such that illuminance on one of its faces is four times that on another face
→Find the resultant of three vectors $\overrightarrow{O A}, \overrightarrow{O B}$ and $\overrightarrow{O C}$ shown in the following figure. Radius of the circle is $R$.
→Brilliance of diamond is due to
Efficiency of a Carnot engine is $50 \%$ when temperature of outlet is $500 \mathrm{~K}$. In order to increase efficiency up to $60 \%$ keeping temperature of intake the same what is temperature of outlet
→Two thin lenses of focal lengths $20 \mathrm{~cm}$ and $25 \mathrm{~cm}$ are placed in contact convex. The effective power of the combination is
→Light of frequency $4 v$ is incident on the metal of the threshold frequency $v$. The maximum kinetic energy of the emitted photoelectrons is
→