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(English Medium) ICSE Class 9 - CISCE Question Bank Solutions

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What would have been the temperature of earth's atmosphere in absence of green house gases in it?

[5] Heat and Energy
Chapter: [5] Heat and Energy
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State the effect of green house gases on the temperature of earth's atmosphere.

[5] Heat and Energy
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What causes the rise in atmospheric temperature?

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State the cause of increase of green house effect.

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The green house gas is : 

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Without green house effect, the average temperature of Earth's surface would have been : 

[5] Heat and Energy
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What is the greenhouse effect?
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What is the reason behind the rising temperature inside a greenhouse?
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What is a greenhouse?

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How does the air inside the greenhouse remain warm?

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Describe an experiment to show that a blackened surface is a better emitter of heat than a polished surface.
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How will you minimize heat loss due to the following:

Convection

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How will you minimize heat loss due to the following:

Conduction

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How will you minimize heat loss due to the following:

Radiation

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A red hot ball is suspended from the ceiling of a room using a thin metallic wire.

Name the ways in which the ball loses heat.

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A red hot ball is suspended from the ceiling of a room using a thin metallic wire.

Suggest the way by which it loses the least amount of heat.

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A red hot ball is suspended from the ceiling of a room using a thin metallic wire.

Explain what role does the air in the room play in the loss of heat.

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Explain the term CFCs.

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Explain the term UV.

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Explain the term WHO.

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