Atmosphere – Composition, Pressure, Winds, Humidity Quiz - ICSE Class 9 Geography
Free practice quiz: Atmosphere – Composition, Pressure, Winds, Humidity (ICSE Class 9 Geography). 48 multiple-choice questions with answers and explanations. Play online, no sign-up needed.
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Which of the following gases constitutes the largest percentage of the Earth's atmosphere by volume?
- Oxygen
- Nitrogen
- Argon
- Carbon Dioxide
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Answer: B. Nitrogen
Nitrogen is the most abundant gas in the Earth's atmosphere, making up approximately 78% of its volume. Oxygen is the second most abundant, at around 21%.
A land breeze typically occurs during the:
- Daytime, when land heats up faster than the sea
- Nighttime, when land cools down faster than the sea
- Afternoon, due to high humidity
- Midnight, due to low temperatures
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Answer: B. Nighttime, when land cools down faster than the sea
At night, land cools more rapidly than the sea. The cooler land creates a higher pressure area, while the relatively warmer sea creates a lower pressure area. Air then flows from the land to the sea, creating a land breeze.
A psychrometer is a device used to measure humidity. It typically consists of:
- A barometer and a thermometer
- A wet-bulb thermometer and a dry-bulb thermometer
- An anemometer and a wind vane
- A rain gauge and a hygrometer
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Answer: B. A wet-bulb thermometer and a dry-bulb thermometer
A psychrometer uses two thermometers: a dry-bulb thermometer that measures the ambient air temperature, and a wet-bulb thermometer whose bulb is covered with a wet cloth. The difference in temperature readings between the two is used to calculate relative humidity and dew point.
The stratopause is the boundary between which two atmospheric layers?
- Troposphere and Stratosphere
- Stratosphere and Mesosphere
- Mesosphere and Thermosphere
- Thermosphere and Exosphere
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Answer: B. Stratosphere and Mesosphere
The stratopause is the thermal boundary separating the stratosphere (above) from the mesosphere (below). Above it, temperatures in the stratosphere increase due to ozone absorption of UV radiation, and then begin to decrease into the mesosphere.
Which gas is the second most abundant in Earth's atmosphere and is essential for respiration?
- Nitrogen
- Oxygen
- Argon
- Carbon Dioxide
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Answer: B. Oxygen
Oxygen makes up approximately 21% of the Earth's atmosphere, making it the second most abundant gas after nitrogen (about 78%). It is vital for the respiration of most living organisms.