Defence Exam > Defence Questions > Which one of the following statements regardi...
Start Learning for Free
Which one of the following statements regarding a thermos flask is NOT correct?
- a)The walls of flask are separated by vacuum and made of glass which is a poor conductor of heat
- b)The glass walls themselves have shiny surfaces
- c)The surface of inner wall radiates good amount of heat and the surface of outer wall absorbs some of the heat that is radiated from the inner wall
- d)The cork supports are poor conductors of heat
Correct answer is option 'C'. Can you explain this answer?
| FREE This question is part of | Download PDF Attempt this Test |
Verified Answer
Which one of the following statements regarding a thermos flask is NOT...
The walls of thermos flask are separated by vacuum and made of glass which is poor conductor of heat. The glass walls themselves have shiny surfaces. The radiation emitted by inner wall and that absorbed by outer wall, both are negligible. The cork supports are poor conductors of heat. So, option (c) is correct.
Most Upvoted Answer
Which one of the following statements regarding a thermos flask is NOT...
Thermos Flask: Understanding its Design and Functionality
Introduction:
A thermos flask, also known as a vacuum flask, is a container designed to keep the temperature of its contents stable. It consists of two glass walls separated by a vacuum, which minimizes heat transfer through conduction and convection. Let us analyze the given options to identify the statement that is not correct.
Option A: The walls of the flask are separated by a vacuum and made of glass which is a poor conductor of heat.
This statement is correct. The vacuum between the walls serves as an insulating layer, preventing heat transfer through conduction and convection. Additionally, glass is a poor conductor of heat, further reducing heat loss.
Option B: The glass walls themselves have shiny surfaces.
This statement is correct. The glass walls of a thermos flask are coated with a reflective layer, typically made of silver or aluminum. This shiny surface helps to minimize heat transfer through radiation by reflecting the thermal radiation back into the flask.
Option C: The surface of the inner wall radiates a good amount of heat, and the surface of the outer wall absorbs some of the heat that is radiated from the inner wall.
This statement is incorrect. In a properly designed thermos flask, the inner wall is coated with a reflective layer to minimize heat loss through radiation. The shiny surface of the inner wall reflects the thermal radiation back into the flask, preventing significant heat loss through radiation. The outer wall, on the other hand, is not designed to absorb the radiated heat but rather acts as an additional insulating layer.
Option D: The cork supports are poor conductors of heat.
This statement is correct. The cork supports used in thermos flasks are poor conductors of heat. Cork is an excellent insulator and helps to reduce heat transfer through conduction from the inner contents to the outer environment.
Conclusion:
Among the given options, option C is the statement that is not correct. In a thermos flask, the surface of the inner wall does not radiate a significant amount of heat, and the surface of the outer wall does not absorb the heat radiated from the inner wall. Instead, the inner wall has a reflective surface to minimize heat loss through radiation, and the outer wall acts as an insulating layer.
Introduction:
A thermos flask, also known as a vacuum flask, is a container designed to keep the temperature of its contents stable. It consists of two glass walls separated by a vacuum, which minimizes heat transfer through conduction and convection. Let us analyze the given options to identify the statement that is not correct.
Option A: The walls of the flask are separated by a vacuum and made of glass which is a poor conductor of heat.
This statement is correct. The vacuum between the walls serves as an insulating layer, preventing heat transfer through conduction and convection. Additionally, glass is a poor conductor of heat, further reducing heat loss.
Option B: The glass walls themselves have shiny surfaces.
This statement is correct. The glass walls of a thermos flask are coated with a reflective layer, typically made of silver or aluminum. This shiny surface helps to minimize heat transfer through radiation by reflecting the thermal radiation back into the flask.
Option C: The surface of the inner wall radiates a good amount of heat, and the surface of the outer wall absorbs some of the heat that is radiated from the inner wall.
This statement is incorrect. In a properly designed thermos flask, the inner wall is coated with a reflective layer to minimize heat loss through radiation. The shiny surface of the inner wall reflects the thermal radiation back into the flask, preventing significant heat loss through radiation. The outer wall, on the other hand, is not designed to absorb the radiated heat but rather acts as an additional insulating layer.
Option D: The cork supports are poor conductors of heat.
This statement is correct. The cork supports used in thermos flasks are poor conductors of heat. Cork is an excellent insulator and helps to reduce heat transfer through conduction from the inner contents to the outer environment.
Conclusion:
Among the given options, option C is the statement that is not correct. In a thermos flask, the surface of the inner wall does not radiate a significant amount of heat, and the surface of the outer wall does not absorb the heat radiated from the inner wall. Instead, the inner wall has a reflective surface to minimize heat loss through radiation, and the outer wall acts as an insulating layer.
|
Explore Courses for Defence exam
|
|
Similar Defence Doubts
Which one of the following statements regarding a thermos flask is NOT correct?a)The walls of flask are separated by vacuum and made of glass which is a poor conductor of heatb)The glass walls themselves have shiny surfacesc)The surface of inner wall radiates good amount of heat and the surface of outer wall absorbs some of the heat that is radiated from the inner walld)The cork supports are poor conductors of heatCorrect answer is option 'C'. Can you explain this answer?
Question Description
Which one of the following statements regarding a thermos flask is NOT correct?a)The walls of flask are separated by vacuum and made of glass which is a poor conductor of heatb)The glass walls themselves have shiny surfacesc)The surface of inner wall radiates good amount of heat and the surface of outer wall absorbs some of the heat that is radiated from the inner walld)The cork supports are poor conductors of heatCorrect answer is option 'C'. Can you explain this answer? for Defence 2024 is part of Defence preparation. The Question and answers have been prepared according to the Defence exam syllabus. Information about Which one of the following statements regarding a thermos flask is NOT correct?a)The walls of flask are separated by vacuum and made of glass which is a poor conductor of heatb)The glass walls themselves have shiny surfacesc)The surface of inner wall radiates good amount of heat and the surface of outer wall absorbs some of the heat that is radiated from the inner walld)The cork supports are poor conductors of heatCorrect answer is option 'C'. Can you explain this answer? covers all topics & solutions for Defence 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for Which one of the following statements regarding a thermos flask is NOT correct?a)The walls of flask are separated by vacuum and made of glass which is a poor conductor of heatb)The glass walls themselves have shiny surfacesc)The surface of inner wall radiates good amount of heat and the surface of outer wall absorbs some of the heat that is radiated from the inner walld)The cork supports are poor conductors of heatCorrect answer is option 'C'. Can you explain this answer?.
Which one of the following statements regarding a thermos flask is NOT correct?a)The walls of flask are separated by vacuum and made of glass which is a poor conductor of heatb)The glass walls themselves have shiny surfacesc)The surface of inner wall radiates good amount of heat and the surface of outer wall absorbs some of the heat that is radiated from the inner walld)The cork supports are poor conductors of heatCorrect answer is option 'C'. Can you explain this answer? for Defence 2024 is part of Defence preparation. The Question and answers have been prepared according to the Defence exam syllabus. Information about Which one of the following statements regarding a thermos flask is NOT correct?a)The walls of flask are separated by vacuum and made of glass which is a poor conductor of heatb)The glass walls themselves have shiny surfacesc)The surface of inner wall radiates good amount of heat and the surface of outer wall absorbs some of the heat that is radiated from the inner walld)The cork supports are poor conductors of heatCorrect answer is option 'C'. Can you explain this answer? covers all topics & solutions for Defence 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for Which one of the following statements regarding a thermos flask is NOT correct?a)The walls of flask are separated by vacuum and made of glass which is a poor conductor of heatb)The glass walls themselves have shiny surfacesc)The surface of inner wall radiates good amount of heat and the surface of outer wall absorbs some of the heat that is radiated from the inner walld)The cork supports are poor conductors of heatCorrect answer is option 'C'. Can you explain this answer?.
Solutions for Which one of the following statements regarding a thermos flask is NOT correct?a)The walls of flask are separated by vacuum and made of glass which is a poor conductor of heatb)The glass walls themselves have shiny surfacesc)The surface of inner wall radiates good amount of heat and the surface of outer wall absorbs some of the heat that is radiated from the inner walld)The cork supports are poor conductors of heatCorrect answer is option 'C'. Can you explain this answer? in English & in Hindi are available as part of our courses for Defence.
Download more important topics, notes, lectures and mock test series for Defence Exam by signing up for free.
Here you can find the meaning of Which one of the following statements regarding a thermos flask is NOT correct?a)The walls of flask are separated by vacuum and made of glass which is a poor conductor of heatb)The glass walls themselves have shiny surfacesc)The surface of inner wall radiates good amount of heat and the surface of outer wall absorbs some of the heat that is radiated from the inner walld)The cork supports are poor conductors of heatCorrect answer is option 'C'. Can you explain this answer? defined & explained in the simplest way possible. Besides giving the explanation of
Which one of the following statements regarding a thermos flask is NOT correct?a)The walls of flask are separated by vacuum and made of glass which is a poor conductor of heatb)The glass walls themselves have shiny surfacesc)The surface of inner wall radiates good amount of heat and the surface of outer wall absorbs some of the heat that is radiated from the inner walld)The cork supports are poor conductors of heatCorrect answer is option 'C'. Can you explain this answer?, a detailed solution for Which one of the following statements regarding a thermos flask is NOT correct?a)The walls of flask are separated by vacuum and made of glass which is a poor conductor of heatb)The glass walls themselves have shiny surfacesc)The surface of inner wall radiates good amount of heat and the surface of outer wall absorbs some of the heat that is radiated from the inner walld)The cork supports are poor conductors of heatCorrect answer is option 'C'. Can you explain this answer? has been provided alongside types of Which one of the following statements regarding a thermos flask is NOT correct?a)The walls of flask are separated by vacuum and made of glass which is a poor conductor of heatb)The glass walls themselves have shiny surfacesc)The surface of inner wall radiates good amount of heat and the surface of outer wall absorbs some of the heat that is radiated from the inner walld)The cork supports are poor conductors of heatCorrect answer is option 'C'. Can you explain this answer? theory, EduRev gives you an
ample number of questions to practice Which one of the following statements regarding a thermos flask is NOT correct?a)The walls of flask are separated by vacuum and made of glass which is a poor conductor of heatb)The glass walls themselves have shiny surfacesc)The surface of inner wall radiates good amount of heat and the surface of outer wall absorbs some of the heat that is radiated from the inner walld)The cork supports are poor conductors of heatCorrect answer is option 'C'. Can you explain this answer? tests, examples and also practice Defence tests.
|
|
Explore Courses for Defence exam
|
|
Signup for Free!
Signup to see your scores go up within 7 days! Learn & Practice with 1000+ FREE Notes, Videos & Tests.
|
© EduRev
|
Education Revolution
|
Follow Us
|
Signup to see your scores
go up within 7 days!
Access 1000+ FREE Docs, Videos and Tests
Takes less than 10 seconds to signup