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. |
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyAir 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. |
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyWhile 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. |
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & Biology