MCQ
The efficiency of Carnot's engine operating between reservoirs, maintained at temperatures ${27^o}C$ and $ - {123^o}C,$ is ...... $\%$
- ✓$50$
- B$24$
- C$0.75$
- D$0.4$
✓
Answer
Correct option: A.
$50$
a
(a)$\eta = 1 - \frac{{{T_2}}}{{{T_1}}} = 1 - \frac{{(273 + 123)}}{{(273 + 27)}} = 1 - \frac{{150}}{{300}} = \frac{1}{2} = 50\% $
(a)$\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.
Explore more
Similar questions
Which of the following quantities does not depend upon the orbital radius of the satellite
Velocity $(v)$ and acceleration $(a)$ in two systems of units $1$ and $2$ are related as $V _{2}=\frac{ n }{ m ^{2}} v _{1}$ and $a_{2}=\frac{a_{1}}{m n}$ respectively. Here $m$ and $n$ are constants. The relations for distance and time in two systems respectively are
→In problem 7.5, the CM of the plate is now in the following quadrant of x - y plane:
Compressibility per unit atm. pressure of water is $'\sigma '$ and if due to pressure $P$ there is decrement in volume $V$, find change is volume
→The surface tension of a liquid is $5 \,N / m$. If a film is held on a ring of area $0.02 \,m ^2$, its surface energy is about ........... $J$
→The equation of state for $5 \,g$ of oxygen at a pressure $P $ and temperature $T,$ when occupying a volume $V,$ will be (Where $R$ is the gas constant)
→A plane is inclined at an angle $\alpha = 30^o$ with respect to the horizontal. A particle is projected with a speed $u = 2\,ms^{-1},$ from the base of the plant, making an angle $\theta = 15^o$ with respect to the plane as shown in the figure. The distance from the base at which the particle hits the plane is close to ........ $cm$ (Take $g = 10\,ms^2$ )
→Action and reaction forces act on
Two equal masses $m$ and $m$ are hung from a balance whose scale pans differ in vertical height by $'h'$. The error in weighing in terms of density of the earth $\rho $ is
→A string of length $2 m$ is fixed at both ends. If this string vibrates in its fourth normal mode with a frequency of $500 Hz$ then the waves would travel on its with a velocity of ..... $m/s$
→