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Earn 100
What is the average temperature of the Earth's surface?
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Important Questions on Thermal Properties of Matter
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Two spherical black bodies have radii and . Their surface temperatures are and . If they radiate same power then is
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Universal gas constant is
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Which method of heat transfer depends on gravity?
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Permanent winds blowing toward the equator are called _____.
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Assertion: It is hotter over the top of fire than at the same distance on the sides.
Reason: Air surrounding the fire conducts more heat upwards.
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State the unit and dimensions of coefficient of convection?
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It is hotter at the same distance over the top of a fire than it is on the side of it, mainly because :
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Explain why felt rather than air is used for thermal insulation even though the thermal conductivity of air is less than that of felt?
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A liquid of mass m and specific heat c is heated to a temperature 2T. Another liquid of mass and specific heat 2c is heated to a temperature T. If these two liquids are mixed, the resulting temperature of the mixture is
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Trade wind is an example of which of these?
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The equatorial and polar regions of the earth receive unequal solar heat. The convection current arising due to this is called:
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Explain how convection causes trade winds.
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Ventilators are provided in rooms just below the roof. Why?
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An ordinary electric fan does not cool the air; still, it gives comfort in summer. Explain.
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Why convection cannot take place in a solid?
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In which of the following process, convection does not takes place primarily?
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Explain the role of rotation of earth in the movement of trade winds.
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In which of the following processes, convection of heat does not take place?
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Two liquids and are at When mixed in equal masses the temperature of the mixture is found to be . Their specific heats are in the ratio of
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Which one of the following processes depends on gravity?
