A black body has a maximum wavelength at a temperature of 2000 K. Its corresponding wavelength at temperatures of 3000 K will be: 

1. \({3 \over 2} \lambda_m\) 2. \({2 \over 3} \lambda_m\)
3. \({4 \over 9} \lambda_m\) 4. \({9 \over 4} \lambda_m\)

Subtopic:  Wien's Displacement Law |
 86%
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If the sun’s surface radiates heat at 6.3×107 Wm-then the temperature of the sun, assuming it to be a black body, will be:
σ=5.7×10-8 Wm-2K-4
1. 5.8×103 K
2. 8.5×103 K
3. 3.5×108 K
4. 5.3×108 K

Subtopic:  Stefan-Boltzmann Law |
 59%
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A block of metal is heated to a temperature much higher than the room temperature and allowed to cool in a room free from air currents. Which of the following curves correctly represents the rate of cooling?

1. 2.
3. 4.
Subtopic:  Newton's Law of Cooling |
 78%
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Taking into account the radiation that a human body emits which of the following statements is true?

1. The radiation is emitted only during the day.
2. The radiation is emitted during the summers and absorbed during the winters.
3. The radiation emitted lies in the ultraviolet region and hence is not visible.
4. The radiation emitted is in the infra-red region.
Subtopic:  Radiation |
 59%
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On a clear sunny day, an object at temperature T is placed on the top of a high mountain. An identical object at the same temperature is placed at the foot of the mountain. If both the objects are exposed to sun-rays for two hours in an identical manner, the object placed on the top of a mountain will register a temperature:

1. higher than the object at the foot.
2. lower than the object at the foot.
3. equal to the object at the foot.
4. none of the above.

Subtopic:  Radiation |
 52%
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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%
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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%
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One likes to sit in the sunshine in the winter season, because:

1. The air around the body is hot, and the body absorbs heat from it.
2. we get energy from the sun.
3. we get heat by conduction from the sun.
4. None of the above



 

Subtopic:  Conduction |
 64%
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Mud houses are cooler in the summer and warmer in the winter because:

1. the mud is a superconductor of heat.
2. the mud is a good conductor of heat.
3. the mud is a bad conductor of heat.
4. None of the above

Subtopic:  Conduction |
 81%
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When two ends of a rod wrapped with cotton are maintained at different temperatures and, after some time, every point of the rod attains a constant temperature, then:

1. Conduction of heat at different points of the rod stops because the temperature is not increasing
2. The rod is a bad conductor of heat
3. Heat is being radiated from each point of the rod
4. Each point of the rod is giving heat to its neighbour at the same rate at which it is receiving heat
Subtopic:  Conduction |
 75%
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