Download App

Thermodynamics — JEE physics STD 12 Science — Question

CBSE BoardEnglish MediumSTD 12 ScienceJEE physicsThermodynamics1 Mark
MCQ
The efficiency of Carnot's engine operating between reservoirs, maintained at temperatures $27^{\circ} \mathrm{C}$ and $-123^{\circ} \mathrm{C}$, is
  • ✓
    $50 \%$
  • B
    $24 \%$
  • C
    $0.75 \%$
  • D
    $0.4 \%$
✓

Answer

Correct option: A.
$50 \%$
(a) $\quad \eta=1-\frac{T_2}{T_1}=1-\frac{(273+123)}{(273+27)}=1-\frac{150}{300}=\frac{1}{2}=50 \%$

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 an ac circuit, the instantaneous values of e.m.f. and current are $e$ $=200 \sin 314 t$ volt and $i=\sin \left(314 t+\frac{\pi}{3}\right)$ ampere. The average power consumed in watt is
→
Three light bulbs of $40 W, 60 W$ and $100 W$ are connected in series with $220 V$ source. Which one of the bulbs will glow brightest
→
A marble block of mass $2 \mathrm{~kg}$ lying on ice when given a velocity of $6 \mathrm{~m} / \mathrm{s}$ is stopped by friction in $10 \mathrm{~s}$. Then the coefficient of friction is
→
In Young's double slit experiment, if monochromatic light is replaced by white light
→
A body is moving along a rough horizontal surface with an initial velocity $6 \mathrm{~m} / \mathrm{s}$. If the body comes to rest after travelling $9 \mathrm{~m}$, then the coefficient of sliding friction will be
→
If the radius of a planet is four times that of earth and the value of $g$ is same for both, the escape velocity on the planet will be
→
The unit of mutual conductance of a triode valve is
→
Stars are twinkling due to
→
Consider a car moving on a straight road with a speed of $100 \mathrm{~m} / \mathrm{s}$. The distance at which car can be stopped is $\left[\mu_k=0.5\right]$
→
Two drops of the same radius are falling through air with a steady velocity of $5\ cm$ per sec. If the two drops coalesce, the terminal velocity would be
→