Given below are two statements: 
Assertion (A): While measuring the thermal conductivity of liquid experimentally, the upper layer is kept hot and the lower layer is kept cold.
Reason (R): This avoids the heating of liquid by convection.
 
1. Both (A) and (R) are true and (R) is the correct explanation of (A).
2. Both (A) and (R) are true but (R) is not the correct explanation of (A).
3. (A) is true but (R) is false.
4. Both (A) and (R) are false.
Subtopic:  Convection |
 83%
From NCERT
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Air is a bad conductor of heat or partly conducts heat. Still, a vacuum is to be placed between the walls of the thermos flask because:

1.  it is difficult to fill the air between the walls of the thermos flask.
2. due to more pressure of air, the thermos can get cracks.
3. by convection, heat can flow through the air.
4. on filling the air, there is no advantage.
Subtopic:  Convection |
 79%
From NCERT
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NEET 2023 - Target Batch - Aryan Raj Singh
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NEET 2023 - Target Batch - Aryan Raj Singh

While measuring the thermal conductivity of a liquid, we keep the upper part hot and the lower part cool, so that:

1. convection may be stopped.
2. radiation may be stopped.
3. heat conduction is easier downwards.
4. it is easier and more convenient to do so.


 

Subtopic:  Convection |
 61%
From NCERT
To view explanation, please take trial in the course.
NEET 2023 - Target Batch - Aryan Raj Singh
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NEET 2023 - Target Batch - Aryan Raj Singh

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