Download App

Thermodynamics — Physics STD 12 Science — Question

Maharashtra BoardEnglish MediumSTD 12 SciencePhysicsThermodynamics2 Marks
Question
In a refrigerator, in one cycle, the external work done on the working substance is $20 \%$ of the energy extracted from the cold reservoir. Find the coefficient of performance of the refrigerator.
✓

Answer

Data: $|W|=0.2\left|Q_c\right|$
The coefficient of performance of the refrigerator,
$ K =\left|\frac{Q_C}{W}\right|=\frac{\left|Q_C\right|}{0.2\left|Q_C\right|}$
$=5 $

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 "Short Answer Type Question" from Thermodynamics→Thermodynamics — all question types→Physics STD 12 Science question papers→Maharashtra Board STD 12 Science question papers→Maharashtra Board question paper generator→

Similar questions

Certain stars are believed to be rotating at about $1 \mathrm{rot} / \mathrm{s}$. If such a star has a diameter of 40 $\mathrm{km}$, what is the linear speed of a point on the equator of the star?
→
For a certain body, the coefficient of absorption (absorptive power, absorptivity) is 0.4 . The body is maintained at a constant temperature. The radiant power of a perfect blackbody maintained at the same temperature is $5 \times 10^4 \mathrm{~W} / \mathrm{m}^2$. Find the radiant power of the body at that temperature.
→
State the factors which magnetic coupling coefficient of two coils depends on.
→
A Gaussian surface in the form of a cube is centred on a point charge $Q$. What is the flux through one face of the cube?
→
A small body of a mass \(0.3 kg\) oscillates in vertical plane with the help of a string \(0.5 m\) long with
a constant speed of \(2 m / s\). It makes an angle of \(60^{\circ}\) with the vertical. Calculate tension in the string.
\(\left(g=9.8 m / s ^2\right)\)
→
Define Mutual Inductance.
→
The optical path of a ray of light of a given wavelength travelling a distance of 3 cm in flint glass having refractive index 1.6 is the same as that on travelling a distance x cm through a medium having a refractive index 1.25. Determine the value of x.
→
The length of an air column for a fundamental mode in a resonance tube is \(16 cm\) and that for second resonance is \(50.25 cm\). Find the end correction.
→
The difference between two molar specific heats of a gas is \(6000 J / kg\). K. If the ratio of specific heats is 1.4 calculate the molar specific heat at constant volume.
→
A solid sphere of mass $1 \mathrm{~kg}$ rolls on a table with linear speed $2 \mathrm{~m} / \mathrm{s}$, find its total kinetic energy.
→