Class 11 Exam > Class 11 Questions > Hot coffee in a thermos flask is shaken vigor...
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Hot coffee in a thermos flask is shaken vigorously, considering it as a system which of the statement is not true?
- a)Temperature of the system rises
- b)Internal energy of the coffee increased
- c)Heat energy has been added to coffee
- d)Work is done on the system
Correct answer is option 'C'. Can you explain this answer?
Most Upvoted Answer
Hot coffee in a thermos flask is shaken vigorously, considering it as ...
No, heat is not transferred as the flask is insulated from the surroundings ∴dQ=0
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Hot coffee in a thermos flask is shaken vigorously, considering it as ...
Explanation:
When hot coffee in a thermos flask is shaken vigorously, it can be considered as a system. Let's analyze the given options:
a) Temperature of the system rises:
When the hot coffee in the thermos flask is shaken, the kinetic energy of the molecules increases due to the external force applied. This leads to an increase in the temperature of the system.
b) Internal energy of the coffee increased:
The internal energy of the coffee is the sum of its kinetic and potential energy. When the coffee is shaken, its kinetic energy increases due to the external force applied. This leads to an increase in the internal energy of the coffee.
c) Heat energy has been added to coffee:
This statement is not true. Heat energy is defined as the energy transferred from one body to another as a result of a temperature difference. In this case, there is no transfer of heat energy from the surroundings to the coffee. The increase in temperature and internal energy of the coffee is due to the external force applied by shaking.
d) Work is done on the system:
When the coffee is shaken, work is done on the system. This is because an external force is applied to the system, which results in a displacement of the coffee particles.
Conclusion:
Hence, the correct option is c) Heat energy has not been added to coffee. The increase in temperature and internal energy of the coffee is due to the external force applied by shaking and not due to the transfer of heat energy from the surroundings.
When hot coffee in a thermos flask is shaken vigorously, it can be considered as a system. Let's analyze the given options:
a) Temperature of the system rises:
When the hot coffee in the thermos flask is shaken, the kinetic energy of the molecules increases due to the external force applied. This leads to an increase in the temperature of the system.
b) Internal energy of the coffee increased:
The internal energy of the coffee is the sum of its kinetic and potential energy. When the coffee is shaken, its kinetic energy increases due to the external force applied. This leads to an increase in the internal energy of the coffee.
c) Heat energy has been added to coffee:
This statement is not true. Heat energy is defined as the energy transferred from one body to another as a result of a temperature difference. In this case, there is no transfer of heat energy from the surroundings to the coffee. The increase in temperature and internal energy of the coffee is due to the external force applied by shaking.
d) Work is done on the system:
When the coffee is shaken, work is done on the system. This is because an external force is applied to the system, which results in a displacement of the coffee particles.
Conclusion:
Hence, the correct option is c) Heat energy has not been added to coffee. The increase in temperature and internal energy of the coffee is due to the external force applied by shaking and not due to the transfer of heat energy from the surroundings.
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Hot coffee in a thermos flask is shaken vigorously, considering it as a system which of the statement is not true?a)Temperature of the system risesb)Internal energy of the coffee increasedc)Heat energy has been added to coffeed)Work is done on the systemCorrect answer is option 'C'. Can you explain this answer? for Class 11 2025 is part of Class 11 preparation. The Question and answers have been prepared according to the Class 11 exam syllabus. Information about Hot coffee in a thermos flask is shaken vigorously, considering it as a system which of the statement is not true?a)Temperature of the system risesb)Internal energy of the coffee increasedc)Heat energy has been added to coffeed)Work is done on the systemCorrect answer is option 'C'. Can you explain this answer? covers all topics & solutions for Class 11 2025 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for Hot coffee in a thermos flask is shaken vigorously, considering it as a system which of the statement is not true?a)Temperature of the system risesb)Internal energy of the coffee increasedc)Heat energy has been added to coffeed)Work is done on the systemCorrect answer is option 'C'. Can you explain this answer?.
Hot coffee in a thermos flask is shaken vigorously, considering it as a system which of the statement is not true?a)Temperature of the system risesb)Internal energy of the coffee increasedc)Heat energy has been added to coffeed)Work is done on the systemCorrect answer is option 'C'. Can you explain this answer? for Class 11 2025 is part of Class 11 preparation. The Question and answers have been prepared according to the Class 11 exam syllabus. Information about Hot coffee in a thermos flask is shaken vigorously, considering it as a system which of the statement is not true?a)Temperature of the system risesb)Internal energy of the coffee increasedc)Heat energy has been added to coffeed)Work is done on the systemCorrect answer is option 'C'. Can you explain this answer? covers all topics & solutions for Class 11 2025 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for Hot coffee in a thermos flask is shaken vigorously, considering it as a system which of the statement is not true?a)Temperature of the system risesb)Internal energy of the coffee increasedc)Heat energy has been added to coffeed)Work is done on the systemCorrect answer is option 'C'. Can you explain this answer?.
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Hot coffee in a thermos flask is shaken vigorously, considering it as a system which of the statement is not true?a)Temperature of the system risesb)Internal energy of the coffee increasedc)Heat energy has been added to coffeed)Work is done on the systemCorrect answer is option 'C'. Can you explain this answer?, a detailed solution for Hot coffee in a thermos flask is shaken vigorously, considering it as a system which of the statement is not true?a)Temperature of the system risesb)Internal energy of the coffee increasedc)Heat energy has been added to coffeed)Work is done on the systemCorrect answer is option 'C'. Can you explain this answer? has been provided alongside types of Hot coffee in a thermos flask is shaken vigorously, considering it as a system which of the statement is not true?a)Temperature of the system risesb)Internal energy of the coffee increasedc)Heat energy has been added to coffeed)Work is done on the systemCorrect answer is option 'C'. Can you explain this answer? theory, EduRev gives you an
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