Composition, structure, greenhouse effect Quiz - ICSE Class 7 Geography

Free practice quiz: Composition, structure, greenhouse effect (ICSE Class 7 Geography). 44 multiple-choice questions with answers and explanations. Play online, no sign-up needed.

Sample questions

1. Which layer of the Earth's atmosphere contains the ozone layer, crucial for absorbing ultraviolet (UV) radiation from the sun?

   1. Troposphere
   2. Stratosphere
   3. Mesosphere
   4. Thermosphere
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   Answer: B. Stratosphere

   The ozone layer is primarily located in the stratosphere, which absorbs most of the Sun's harmful ultraviolet radiation, protecting life on Earth.

2. The process by which the Earth's surface absorbs solar energy and then radiates it back as infrared heat is fundamental to the greenhouse effect. This re-radiated heat is then trapped by greenhouse gases. Which type of radiation is primarily trapped by greenhouse gases?

   1. Visible light
   2. Ultraviolet radiation
   3. Infrared radiation
   4. X-rays
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   Answer: C. Infrared radiation

   Greenhouse gases are transparent to most incoming visible sunlight but are effective at absorbing and re-emitting the outgoing infrared radiation (heat) emitted by the Earth's surface, thus trapping heat in the atmosphere.

3. The atmospheric layer where meteors typically burn up due to friction is the:

   1. Stratosphere
   2. Mesosphere
   3. Thermosphere
   4. Exosphere
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   Answer: B. Mesosphere

   The mesosphere is the coldest layer of the atmosphere. It is dense enough to cause friction with incoming meteors, causing them to burn up and create visible streaks of light (shooting stars).

4. Which gas is a significant greenhouse gas and a major component of natural gas, often released from livestock and rice cultivation?

   1. Carbon Dioxide (CO2)
   2. Nitrous Oxide (N2O)
   3. Methane (CH4)
   4. Water Vapor (H2O)
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   Answer: C. Methane (CH4)

   Methane is a potent greenhouse gas. While it is a smaller component of the atmosphere than carbon dioxide, its heat-trapping ability per molecule is much higher. It is produced by natural processes like decomposition in anaerobic conditions and by human activities.

5. Which gas is responsible for the majority of the atmospheric mass?

   1. Oxygen
   2. Carbon Dioxide
   3. Nitrogen
   4. Water Vapor
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   Answer: C. Nitrogen

   Nitrogen, at 78% of the atmosphere, contributes the most to its mass.

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