All Courses
Explore Courses UPSC Exam UPSC Test Series Free Notes EduRev Infinity Get the App Login Join for Free
Sign in Open App
Class 11 Exam  >  Class 11 Questions  >  The second law of thermodynamics saysa)Coeffi... Start Learning for Free
SaveJoin the Discussion on the App
The second law of thermodynamics says
  • a)
    Coefficient of performance can never be infinite for refrigerator
  • b)
    Heat released to the cold reservoir can be zero
  • c)
    Ideal gas can expand infinitely​
  • d)
    Efficiency of a heat engine can be 100%.
Correct answer is option 'A'. Can you explain this answer?
FREE This question is part of
Download PDF Attempt Test
Download PDF Attempt this Test
Verified Answer
The second law of thermodynamics saysa)Coefficient of performance can ...
The second law of thermodynamics gives a fundamental limitation to the efficiency of a heat engine and the coefficient of performance of a refrigerator. It says that the efficiency of a heat engine can never be unity or 100%, this implies that the heat released to the cold reservoir can never be made zero.
For a refrigerator the second law says that the coefficient through performance can never be infinite, this implies that the external work can never be zero.
View all questions of this test
Most Upvoted Answer
The second law of thermodynamics saysa)Coefficient of performance can ...
Free Test
FREE
Start Free Test
Start Free Test
Community Answer
The second law of thermodynamics saysa)Coefficient of performance can ...
The Second Law of Thermodynamics:

The second law of thermodynamics is a fundamental principle in physics that governs the behavior of energy and heat transfer. It has several statements, but one of its key implications is that the coefficient of performance (COP) of a refrigerator or heat pump can never be infinite.

Understanding the Coefficient of Performance (COP):

The coefficient of performance (COP) is a measure of the efficiency of a refrigerator or heat pump. It is defined as the ratio of the desired output (cooling or heating) to the required input (work or energy). Mathematically, COP is given by:

COP = Desired Output / Required Input

For a refrigerator or heat pump, the desired output is the amount of heat transferred from the cold reservoir (the space being cooled) to the hot reservoir (the surroundings) per unit of work input. The required input is the amount of work or energy required to achieve this heat transfer.

The Second Law's Implication:

The second law of thermodynamics states that it is impossible to transfer heat from a colder object to a hotter object without the input of work or the use of a heat pump. In other words, heat naturally flows from objects at higher temperatures to objects at lower temperatures.

Explanation of Option 'A':

Option 'A' states that the coefficient of performance can never be infinite for a refrigerator. This is consistent with the second law of thermodynamics because a COP of infinity would imply that heat could be transferred from a cold reservoir (the space being cooled) to a hot reservoir (the surroundings) without any work input.

If the COP were infinite, it would mean that the refrigerator could continuously cool the space without any energy input. However, according to the second law, this is not possible. The refrigerator requires work input to transfer heat from the cold reservoir to the hot surroundings. Therefore, the COP can never be infinite.

Conclusion:

The second law of thermodynamics is a fundamental principle that governs the behavior of energy and heat transfer. It implies that the coefficient of performance (COP) of a refrigerator or heat pump can never be infinite. Option 'A' is the correct answer because it aligns with this implication of the second law.
Attention Class 11 Students!
To make sure you are not studying endlessly, EduRev has designed Class 11 study material, with Structured Courses, Videos, & Test Series. Plus get personalized analysis, doubt solving and improvement plans to achieve a great score in Class 11.
< Previous Question Next Question >
Explore Courses for Class 11 exam

Similar Class 11 Doubts

Attempt All sub parts from each question.If we turn on our electric oven, and it will warm up the room. Keeping the oven door open, the room gets warm even faster. This is obvious since the purpose of an oven is to make things hot. But the opposite is not true of a refrigerator. Running the refrigerator makes the room warmer. If the door is kept open, the room gets warm up even faster. The first rush of cold air may cool things down a little, but in the long run, the room will get warmer. To see why, we need to think of heat as energy and cold as a lack of energy. The stove produces heat, but the refrigerator can't actually produce cold. All the refrigerator does is move heat, or energy, from one place to another. As the food inside the refrigerator loses its heat or, in other words, gets colder that heat warms up the room A refrigerator is an open system that dispels heat from a closed space to a warmer area, usually in the room. By dispelling the heat from this area, it decreases the temperature inside, allowing food and other items to remain cool. Refrigerators appear to violate the second law of thermodynamics. But actually they do not. Physicists call this kind of system a "heat pump." According to the Second Law of Thermodynamics, heat always flows from hot to cold, and not in the other way around. A refrigerator causes heat to flow from cold to hot by inputting work, which cools the space inside it.It does this by following the steps below:• Work is inputted (Win) which compresses a coolant, increases its temperature above the room temperature.• Heat flows from coolant into the room (QH) reducing the temperature of the coolant.• The coolant expands and it cools down below the temperature inside the refrigerator.• Heat flows from the refrigerator to the coolant (QC) decreasing the temperature inside.So, the heat pump in refrigerator needs energy to run. So while it is busy in moving energy out of the refrigerator and into the room, it also draws more energy in the form of electricity. Since some of that energy is released as heat, the room gets warmer.For refrigerators, a manufacturer would want to make the area colder while doing as little work as possible. By doing little work to cool the appliance, the refrigerator can stay at the desired temperature while using less electricity. The number that describes this idea is known as the coefficient of performance, K, which is essentially a measure of efficiency.The higher this value is, the better the refrigerator, because it means that less work is being done to cool down the refrigerator.Q. 2nd law of thermodynamics states

Attempt All sub parts from each question.If we turn on our electric oven, and it will warm up the room. Keeping the oven door open, the room gets warm even faster. This is obvious since the purpose of an oven is to make things hot. But the opposite is not true of a refrigerator. Running the refrigerator makes the room warmer. If the door is kept open, the room gets warm up even faster. The first rush of cold air may cool things down a little, but in the long run, the room will get warmer. To see why, we need to think of heat as energy and cold as a lack of energy. The stove produces heat, but the refrigerator can't actually produce cold. All the refrigerator does is move heat, or energy, from one place to another. As the food inside the refrigerator loses its heat or, in other words, gets colder that heat warms up the room A refrigerator is an open system that dispels heat from a closed space to a warmer area, usually in the room. By dispelling the heat from this area, it decreases the temperature inside, allowing food and other items to remain cool. Refrigerators appear to violate the second law of thermodynamics. But actually they do not. Physicists call this kind of system a "heat pump." According to the Second Law of Thermodynamics, heat always flows from hot to cold, and not in the other way around. A refrigerator causes heat to flow from cold to hot by inputting work, which cools the space inside it.It does this by following the steps below:• Work is inputted (Win) which compresses a coolant, increases its temperature above the room temperature.• Heat flows from coolant into the room (QH) reducing the temperature of the coolant.• The coolant expands and it cools down below the temperature inside the refrigerator.• Heat flows from the refrigerator to the coolant (QC) decreasing the temperature inside.So, the heat pump in refrigerator needs energy to run. So while it is busy in moving energy out of the refrigerator and into the room, it also draws more energy in the form of electricity. Since some of that energy is released as heat, the room gets warmer.For refrigerators, a manufacturer would want to make the area colder while doing as little work as possible. By doing little work to cool the appliance, the refrigerator can stay at the desired temperature while using less electricity. The number that describes this idea is known as the coefficient of performance, K, which is essentially a measure of efficiency.The higher this value is, the better the refrigerator, because it means that less work is being done to cool down the refrigerator.Q. Which of the following statement is true?

Attempt All sub parts from each question.If we turn on our electric oven, and it will warm up the room. Keeping the oven door open, the room gets warm even faster. This is obvious since the purpose of an oven is to make things hot. But the opposite is not true of a refrigerator. Running the refrigerator makes the room warmer. If the door is kept open, the room gets warm up even faster. The first rush of cold air may cool things down a little, but in the long run, the room will get warmer. To see why, we need to think of heat as energy and cold as a lack of energy. The stove produces heat, but the refrigerator can't actually produce cold. All the refrigerator does is move heat, or energy, from one place to another. As the food inside the refrigerator loses its heat or, in other words, gets colder that heat warms up the room A refrigerator is an open system that dispels heat from a closed space to a warmer area, usually in the room. By dispelling the heat from this area, it decreases the temperature inside, allowing food and other items to remain cool. Refrigerators appear to violate the second law of thermodynamics. But actually they do not. Physicists call this kind of system a "heat pump." According to the Second Law of Thermodynamics, heat always flows from hot to cold, and not in the other way around. A refrigerator causes heat to flow from cold to hot by inputting work, which cools the space inside it.It does this by following the steps below:• Work is inputted (Win) which compresses a coolant, increases its temperature above the room temperature.• Heat flows from coolant into the room (QH) reducing the temperature of the coolant.• The coolant expands and it cools down below the temperature inside the refrigerator.• Heat flows from the refrigerator to the coolant (QC) decreasing the temperature inside.So, the heat pump in refrigerator needs energy to run. So while it is busy in moving energy out of the refrigerator and into the room, it also draws more energy in the form of electricity. Since some of that energy is released as heat, the room gets warmer.For refrigerators, a manufacturer would want to make the area colder while doing as little work as possible. By doing little work to cool the appliance, the refrigerator can stay at the desired temperature while using less electricity. The number that describes this idea is known as the coefficient of performance, K, which is essentially a measure of efficiency.The higher this value is, the better the refrigerator, because it means that less work is being done to cool down the refrigerator.Q. Performance of refrigerator is based on ............... law of thermodynamics.

Attempt All sub parts from each question.If we turn on our electric oven, and it will warm up the room. Keeping the oven door open, the room gets warm even faster. This is obvious since the purpose of an oven is to make things hot. But the opposite is not true of a refrigerator. Running the refrigerator makes the room warmer. If the door is kept open, the room gets warm up even faster. The first rush of cold air may cool things down a little, but in the long run, the room will get warmer. To see why, we need to think of heat as energy and cold as a lack of energy. The stove produces heat, but the refrigerator can't actually produce cold. All the refrigerator does is move heat, or energy, from one place to another. As the food inside the refrigerator loses its heat or, in other words, gets colder that heat warms up the room A refrigerator is an open system that dispels heat from a closed space to a warmer area, usually in the room. By dispelling the heat from this area, it decreases the temperature inside, allowing food and other items to remain cool. Refrigerators appear to violate the second law of thermodynamics. But actually they do not. Physicists call this kind of system a "heat pump." According to the Second Law of Thermodynamics, heat always flows from hot to cold, and not in the other way around. A refrigerator causes heat to flow from cold to hot by inputting work, which cools the space inside it.It does this by following the steps below:• Work is inputted (Win) which compresses a coolant, increases its temperature above the room temperature.• Heat flows from coolant into the room (QH) reducing the temperature of the coolant.• The coolant expands and it cools down below the temperature inside the refrigerator.• Heat flows from the refrigerator to the coolant (QC) decreasing the temperature inside.So, the heat pump in refrigerator needs energy to run. So while it is busy in moving energy out of the refrigerator and into the room, it also draws more energy in the form of electricity. Since some of that energy is released as heat, the room gets warmer.For refrigerators, a manufacturer would want to make the area colder while doing as little work as possible. By doing little work to cool the appliance, the refrigerator can stay at the desired temperature while using less electricity. The number that describes this idea is known as the coefficient of performance, K, which is essentially a measure of efficiency.The higher this value is, the better the refrigerator, because it means that less work is being done to cool down the refrigerator.Q. In refrigerator, work is inputted which

Attempt All sub parts from each question.If we turn on our electric oven, and it will warm up the room. Keeping the oven door open, the room gets warm even faster. This is obvious since the purpose of an oven is to make things hot. But the opposite is not true of a refrigerator. Running the refrigerator makes the room warmer. If the door is kept open, the room gets warm up even faster. The first rush of cold air may cool things down a little, but in the long run, the room will get warmer. To see why, we need to think of heat as energy and cold as a lack of energy. The stove produces heat, but the refrigerator can't actually produce cold. All the refrigerator does is move heat, or energy, from one place to another. As the food inside the refrigerator loses its heat or, in other words, gets colder that heat warms up the room A refrigerator is an open system that dispels heat from a closed space to a warmer area, usually in the room. By dispelling the heat from this area, it decreases the temperature inside, allowing food and other items to remain cool. Refrigerators appear to violate the second law of thermodynamics. But actually they do not. Physicists call this kind of system a "heat pump." According to the Second Law of Thermodynamics, heat always flows from hot to cold, and not in the other way around. A refrigerator causes heat to flow from cold to hot by inputting work, which cools the space inside it.It does this by following the steps below:• Work is inputted (Win) which compresses a coolant, increases its temperature above the room temperature.• Heat flows from coolant into the room (QH) reducing the temperature of the coolant.• The coolant expands and it cools down below the temperature inside the refrigerator.• Heat flows from the refrigerator to the coolant (QC) decreasing the temperature inside.So, the heat pump in refrigerator needs energy to run. So while it is busy in moving energy out of the refrigerator and into the room, it also draws more energy in the form of electricity. Since some of that energy is released as heat, the room gets warmer.For refrigerators, a manufacturer would want to make the area colder while doing as little work as possible. By doing little work to cool the appliance, the refrigerator can stay at the desired temperature while using less electricity. The number that describes this idea is known as the coefficient of performance, K, which is essentially a measure of efficiency.The higher this value is, the better the refrigerator, because it means that less work is being done to cool down the refrigerator.Q. Keeping the door of a refrigeration open the room temperature

Top Courses for Class 11View all

Top Courses for Class 11

The second law of thermodynamics saysa)Coefficient of performance can never be infinite for refrigeratorb)Heat released to the cold reservoir can be zeroc)Ideal gas can expand infinitelyd)Efficiency of a heat engine can be 100%.Correct answer is option 'A'. Can you explain this answer?
Question Description
The second law of thermodynamics saysa)Coefficient of performance can never be infinite for refrigeratorb)Heat released to the cold reservoir can be zeroc)Ideal gas can expand infinitelyd)Efficiency of a heat engine can be 100%.Correct answer is option 'A'. Can you explain this answer? for Class 11 2024 is part of Class 11 preparation. The Question and answers have been prepared according to the Class 11 exam syllabus. Information about The second law of thermodynamics saysa)Coefficient of performance can never be infinite for refrigeratorb)Heat released to the cold reservoir can be zeroc)Ideal gas can expand infinitelyd)Efficiency of a heat engine can be 100%.Correct answer is option 'A'. Can you explain this answer? covers all topics & solutions for Class 11 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for The second law of thermodynamics saysa)Coefficient of performance can never be infinite for refrigeratorb)Heat released to the cold reservoir can be zeroc)Ideal gas can expand infinitelyd)Efficiency of a heat engine can be 100%.Correct answer is option 'A'. Can you explain this answer?.
Solutions for The second law of thermodynamics saysa)Coefficient of performance can never be infinite for refrigeratorb)Heat released to the cold reservoir can be zeroc)Ideal gas can expand infinitelyd)Efficiency of a heat engine can be 100%.Correct answer is option 'A'. Can you explain this answer? in English & in Hindi are available as part of our courses for Class 11. Download more important topics, notes, lectures and mock test series for Class 11 Exam by signing up for free.
Here you can find the meaning of The second law of thermodynamics saysa)Coefficient of performance can never be infinite for refrigeratorb)Heat released to the cold reservoir can be zeroc)Ideal gas can expand infinitelyd)Efficiency of a heat engine can be 100%.Correct answer is option 'A'. Can you explain this answer? defined & explained in the simplest way possible. Besides giving the explanation of The second law of thermodynamics saysa)Coefficient of performance can never be infinite for refrigeratorb)Heat released to the cold reservoir can be zeroc)Ideal gas can expand infinitelyd)Efficiency of a heat engine can be 100%.Correct answer is option 'A'. Can you explain this answer?, a detailed solution for The second law of thermodynamics saysa)Coefficient of performance can never be infinite for refrigeratorb)Heat released to the cold reservoir can be zeroc)Ideal gas can expand infinitelyd)Efficiency of a heat engine can be 100%.Correct answer is option 'A'. Can you explain this answer? has been provided alongside types of The second law of thermodynamics saysa)Coefficient of performance can never be infinite for refrigeratorb)Heat released to the cold reservoir can be zeroc)Ideal gas can expand infinitelyd)Efficiency of a heat engine can be 100%.Correct answer is option 'A'. Can you explain this answer? theory, EduRev gives you an ample number of questions to practice The second law of thermodynamics saysa)Coefficient of performance can never be infinite for refrigeratorb)Heat released to the cold reservoir can be zeroc)Ideal gas can expand infinitelyd)Efficiency of a heat engine can be 100%.Correct answer is option 'A'. Can you explain this answer? tests, examples and also practice Class 11 tests.
Explore Courses for Class 11 exam

Top Courses for Class 11

Explore Courses

Suggested Free Tests

Signup for Free!
Signup to see your scores go up within 7 days! Learn & Practice with 1000+ FREE Notes, Videos & Tests.
10M+ students study on EduRev
Get App
© EduRev
Education Revolution
Signup to see your scores go up within 7 days!
Access 1000+ FREE Docs, Videos and Tests
Takes less than 10 seconds to signup