A carnot engine having an efficiency of 110th of heat engine, is used as a refrigerator. If then work done on the system is 10 J, the amount of energy absorbed from the reservoir at lower temperature is:

1. 1 J

2. 90 J

3. 99 J

4. 100 J 

Subtopic:  Heat Engine & Refrigerator (OLD NCERT) |
 61%
From NCERT
NEET - 2017
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A refrigerator works between 4°C and 30°C. It is required to remove 600 calories of heat every second in order to keep the temperature of the refrigerated space constant. The power required is (Take, 1 cal = 4.2 Joules)

(1)23.65W

(2)236.5W

(3)2365W

(4)2.365W

Subtopic:  Heat Engine & Refrigerator (OLD NCERT) |
 72%
From NCERT
NEET - 2016
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The temperature inside a refrigerator (reversible process) is t2oC and the room temperature is t1oC. The amount of heat delivered to the room for each joule of electrical energy consumed, ideally, will be:

1.  t1t1-t2

2.  t1+273t1-t2

3.  t2+273t1+t2

4.  t1+t2t1+273

Subtopic:  Heat Engine & Refrigerator (OLD NCERT) |
 68%
From NCERT
NEET - 2016
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A Carnot engine having an efficiency of \(\frac{1}{10}\) as heat engine, is used as a refrigerator. If the work done on the system is \(10\) J, the amount of energy absorbed from the reservoir at a lower temperature is:
1. \(90\) J
2. \(99\) J
3. \(100\) J
4. \(1\) J

Subtopic:  Heat Engine & Refrigerator (OLD NCERT) |
 57%
From NCERT
NEET - 2017
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A refrigerator works between 40C and 300C. It is required to remove 600 calories of heat every second to keep the temperature of the refrigerated space constant. The power required will be: 
(Take, 1 cal= 4.2 Joules)
1. 23.65 W
2. 236.5 W
3. 2365 W
4. 2.365 W
Subtopic:  Heat Engine & Refrigerator (OLD NCERT) |
 74%
From NCERT
NEET - 2016
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The coefficient of performance of a refrigerator is \(5.\) If the temperature inside the freezer is \(-20^\circ \text{C},\) the temperature of the surroundings to which it rejects heat is:
1. \(31^\circ \text{C}\)
2. \(41^\circ \text{C}\)
3. \(11^\circ \text{C}\)
4. \(21^\circ \text{C}\)

Subtopic:  Heat Engine & Refrigerator (OLD NCERT) |
 63%
From NCERT
NEET - 2015
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NEET 2023 - Target Batch - Aryan Raj Singh

A Carnot engine, having an efficiency of η110 as a heat engine, is used as a refrigerator. If the work done on the system is \(10\) J, the amount of energy absorbed from the reservoir at a lower temperature is:
1. \(100\) J
2. \(99\) J
3. \(90\) J
4. \(1\) J

Subtopic:  Heat Engine & Refrigerator (OLD NCERT) |
 74%
From NCERT
NEET - 2015
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An engine has an efficiency of 16. When the temperature of the sink is reduced by 620C, its efficiency is doubled. the temperature of the source is:

1. 124oC

2. 37oC

3. 62oC

4. 99oC

Subtopic:  Heat Engine & Refrigerator (OLD NCERT) |
 56%
From NCERT
AIPMT - 2007
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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 (at which heat is rejected) will be 
1. 325°C
2. 325K
3. 39°C
4. 320°C

Subtopic:  Heat Engine & Refrigerator (OLD NCERT) |
 70%
From NCERT
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The coefficient of performance of an ideal refrigerator is 3 which extracts heat from the sink at the rate of 399 J per cycle. The amount of heat it gives to the room per cycle will be:

1 532 J

2 250 J

3 300 J

4 496 J

Subtopic:  Heat Engine & Refrigerator (OLD NCERT) |
 75%
From NCERT
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