Download App

Thermodynamics — JEE physics STD 12 Science — Question

CBSE BoardEnglish MediumSTD 12 ScienceJEE physicsThermodynamics1 Mark
MCQ
A thermodynamic system is taken through the cycle $\text{PQRSP}$ process. The net work done by the system isImage
  • ✓
    $20 \mathrm{~J}$
  • B
    $-20 \mathrm{~J}$
  • C
    $400 \mathrm{~J}$
  • D
    $-374 \mathrm{~J}$
✓

Answer

Correct option: A.
$20 \mathrm{~J}$
Work done by the system $=$ Area of shaded portion on $P-V$ diagram
$[=(300-100)10^{-6} \times(200-10) \times 10^3=20 \mathrm{~J}]$

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

In Newton's experiment of cooling, the water equivalent of two similar calorimeters is $10 \mathrm{gm}$ each. They are filled with $350 \mathrm{gm}$ of water and $300 \mathrm{gm}$ of a liquid (equal volumes) separately. The time taken by water and liquid to cool from $70^{\circ} \mathrm{C}$ to $60^{\circ} \mathrm{C}$ is $3 \mathrm{~min}$ and $95 \mathrm{sec}$ respectively. The specific heat of the liquid will be
→
A $36\  \Omega$ galvanometer is shunted by resistance of $4 \ \Omega$. The percentage of the total current, which passes through the galvanometer is
→
The coil of area $0.1 \mathrm{~m}$ has 500 turns. After placing the coil in a magnetic field of strength $4 \times 10^{-4} \mathrm{~Wb} / \mathrm{m}^2$, if rotated through 90 in $0.1 \mathrm{~s}$, the average $\mathrm{emf}$ induced in the coil is
→
An ideal transformer has $100$ turns in the primary and $250$ turns in the secondary. The peak value of the ac is $28 \mathrm{~V}$. The r.m.s. secondary voltage is nearest to
→
The internal energy of an ideal gas depends upon
→
A wave is reflected from a rigid support. The change in phase on reflection will be
→
An achromatic telescope objective is to be made by combining the lenses of flint and crown glasses. This proper choice is
→
An electric lamp is connected to $220 V, 50 Hz$ supply. Then the peak value of voltage is
→
When an ideal gas in a cylinder was compressed isothermally by a piston, the work done on the gas was found to be $1.5 \times 10^4$ joules. During this process about
→
If the maximum value of accelerating potential provided by a ratio frequency oscillator is $12\, {kV}$. The number of revolution made by a proton in a cyclotron to achieve one sixth of the speed of light is ....... .

$\left[{m}_{{p}}=1.67 \times 10^{-27} {kg}, {e}=1.6 \times 10^{-19} {C},\right.$ Speed of light $\left.=3 \times 10^{8} {m} / {s}\right]$

→