Download App

Thermodynamics — JEE physics STD 12 Science — Question

CBSE BoardEnglish MediumSTD 12 ScienceJEE physicsThermodynamics1 Mark
MCQ
We consider a thermodynamic system. If $\Delta U$ represents the increase in its internal energy and $W$ the work done by the system, which of the following statements is true
  • ✓
    $\Delta U=-W$ in an adiabatic process
  • B
    $\Delta U=W$ in an isothermal process
  • C
    $\Delta U=-W$ in an isothermal process
  • D
    $\Delta U=W$ in an adiabatic process
✓

Answer

Correct option: A.
$\Delta U=-W$ in an adiabatic process
(a) According to the first law of thermodynamics$\Delta Q=\Delta U+\Delta W$In adiabatic process $\Delta Q=0$, hence $\Delta U=-\Delta W$

Need a full question paper?

Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.

Start Generating Free

Explore more

More "MCQ" from Thermodynamics→Thermodynamics — all question types→JEE physics STD 12 Science question papers→CBSE Board STD 12 Science question papers→CBSE Board question paper generator→

Similar questions

The phase angle between e.m.f. and current in $L C R$ series ac circuit is
→
$\mu_0$ and $\varepsilon_0$ denote the permeability and permittivity of free space, the dimensions of $\mu_0 \varepsilon_0$ are
→
A body is moved along a straight line by a machine delivering constant power. The distance moved by the body in time $t$ is proportional to
→
An electric bulb rated for 500 watts at 100 volts is used in a circuit having a 200-volt supply. The resistance $R$ that must be put in series with the bulb, so that the bulb draws $500 W$ is
→
In a transformer, the coefficient of mutual inductance between the primary and the secondary coil is $0.2$ henry. When the current changes by $5$ ampere/second in the primary, the induced e.m.f. in the secondary will be
→
During the adiabatic expansion of $2$ moles of a gas, the internal energy was found to have decreased by $100 \mathrm{~J}$. The work done by the gas in this process is
→
When a hydrogen atom is raised from the ground state to an excited state [CBSE PMT 1995; AMU (Med.) 1999]
→
A bar magnet is held perpendicular to a uniform magnetic field. If the couple acting on the magnet is to be halved by rotating it, then the angle by which it is to be rotated is
→
When germanium is doped with phosphorus, the doped material has
→
A force $\boldsymbol{F}=(5 \hat{\boldsymbol{i}}+3 \hat{\boldsymbol{j}})$ newton is applied over a particle which displaces it from its origin to the point $\boldsymbol{r}=(2 \hat{i}-1 \hat{\boldsymbol{j}})$ metres. The work done on the particle is
→