Air and Atmosphere Quiz - ICSE Class 6 Chemistry

Free practice quiz: Air and Atmosphere (ICSE Class 6 Chemistry). 51 multiple-choice questions with answers and explanations. Play online, no sign-up needed.

Sample questions

1. Which layer of the Earth's atmosphere is closest to the surface and experiences weather phenomena like rain and clouds?

   1. Stratosphere
   2. Mesosphere
   3. Troposphere
   4. Thermosphere
   Show answer

   Answer: C. Troposphere

   The troposphere is the lowest layer of the Earth's atmosphere, extending from the surface up to about 7-20 km. It contains most of the atmosphere's mass and water vapor, leading to weather events.

2. What are particles or tiny droplets of liquid suspended in the atmosphere called?

   1. Gases
   2. Aerosols
   3. Vapors
   4. Plumes
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   Answer: B. Aerosols

   Aerosols are fine solid particles or liquid droplets, such as dust, salt, or pollution, that remain suspended in the atmosphere and can affect air quality and climate.

3. What causes the natural increase in temperature in the troposphere as altitude decreases?

   1. Decreased absorption of solar radiation
   2. Increased density of gases
   3. Absorption of infrared radiation by greenhouse gases
   4. More direct sunlight at lower altitudes
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   Answer: C. Absorption of infrared radiation by greenhouse gases

   As you descend into the troposphere, you get closer to the Earth's surface, which absorbs solar radiation and re-emits it as infrared radiation. Greenhouse gases in the atmosphere absorb this infrared radiation, warming the air.

4. The upper atmosphere, specifically the thermosphere, is heated by absorption of high-energy solar radiation, leading to very high temperatures, but it would feel cold to us because:

   1. There is too much oxygen
   2. The air is extremely thin (low density)
   3. There is too much nitrogen
   4. The pressure is too high
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   Answer: B. The air is extremely thin (low density)

   Although the particles in the thermosphere are moving very fast and possess high kinetic energy, the extremely low density means there are very few particles to transfer heat to an object, making it feel very cold.

5. Which of the following is NOT a greenhouse gas?

   1. Methane
   2. Nitrous Oxide
   3. Argon
   4. Water Vapor
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   Answer: C. Argon

   Argon is an inert gas and does not significantly absorb or emit infrared radiation, so it is not considered a greenhouse gas. Methane, nitrous oxide, and water vapor are potent greenhouse gases.

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