A refrigerator absorbs 2000 cal of heat ...

A refrigerator absorbs 2000 cal of heat from ice trays. If the coefficient of performance is 4, then work done by the motor is

2100 J

4200 J

8400 J

500 J

Text Solution

Verified by Experts

The correct Answer is:

Topper's Solved these Questions

NTA NEET SET 23
NTA MOCK TESTS|Exercise PHYSICS|45 Videos
NTA NEET SET 26
NTA MOCK TESTS|Exercise PHYSICS|45 Videos

Similar Questions

Explore conceptually related problems

An ideal refrigerator has a freezer at a temperature of -13^(@)C . The coefficient of performance of the engine is 5 . The temperature of the air (to which heat is rejected) will be

In a refrigerator, the external work done on the working substance in one cycle is 20% of the energy extracted from the cold reservoir. The coefficient of performance of the refrigerator is

Consider the cyclic process abca performed on a sample of 2.0 mole of an ideal gas. A total of 1000 cal of heat is withdrawn from the sample in the process. Find the work done by the gas during the past bc.

A Carnot refrigerator has freezer at temperature -8°C. The coefficient of performance of refrigerator is 5. The temperature of surrounding in which heat is rejected, will be

For a refrigerator , heat absorbed from source is 800 J and heat supplied to sink is 500 J then find coefficient of performance is :-

Describe the working of a refrigerator as a heat pump. Derive an expression for its coefficient of performance.

A refrigerator whose coefficient of performance eta' is 4, extracts heat from the cooling compartment at the rate of 400 J per cycle. (a) How much work per cycle is required to operate the refrigerator cycle? (b) How much heat per cycle is discharged to the room which acts as the high temperature reservoir?

Can we increase the coefficient of performance of a refrigerator by increasing the amount of working substance?

An ideal refrigerator is used to transfer heat from a freezer at -23^@C to the surrounding at 27^@C . Its coefficient of performance is

NTA MOCK TESTS-NTA NEET SET 24-PHYSICS

Two identical conducting rods are first connected independently to two...
Text Solution
|
An ideal gas is taken around the cycle ABCA as shown in the P-V diagra...
Text Solution
|
A refrigerator absorbs 2000 cal of heat from ice trays. If the coeffic...
Text Solution
|
A vessel is filled with an ideal gas at a pressure of 10 atmospheres a...
Text Solution
|
A conductor is carrying a current i. the magnetic field intensity at a...
Text Solution
|
Identify the correct statement among the following.
Text Solution
|
A body is thrown up in a lift with a velocity 5ms^(-1) relative to the...
Text Solution
|
A particle is projected at an angle of 60^(@) above the horizontal wit...
Text Solution
|
A packet of weight w is dropped with the help of a parachute and on st...
Text Solution
|
The binding energy per nucleon are 53 Mev, 6.2 MeV and 7.4 MeV for the...
Text Solution
|
If the total energy of a simple harmonic oscillator is E, then its pot...
Text Solution
|
For simple Harmonic Oscillator, the potential energy is equal to kinet...
Text Solution
|
A lamp radiates power P(0) uniformly in all directions, the amplitude ...
Text Solution
|
A photon will have less energy if its
Text Solution
|
Assume that a drop of liquid evaporates by decreases in its surface en...
Text Solution
|
Flow rate of blood through a capillary of cross - sectional are of 0.2...
Text Solution
|
The focal length of lens of refractive index 1.5 in air is 30 cm When ...
Text Solution
|
An astronomical telescope has objective and eye-piece lens of powers 0...
Text Solution
|
A yo-yo is placed on a rough horizontal surface and a constant force F...
Text Solution
|
A thin circular ring of mass M and radius R is rotating about its a...
Text Solution
|