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.

This ICSE Class 9 Geography practice quiz has 48 multiple-choice questions on Atmosphere – Composition, Pressure, Winds, Humidity, and 48 of them come with an explanation. Try the 5 sample questions below (tap an option to check yourself), then play the full quiz online. No sign-up needed.

Sample questions

1. Which of the following gases constitutes the largest percentage of the Earth's atmosphere by volume?

   1. Oxygen
   2. Nitrogen
   3. Argon
   4. Carbon Dioxide
   Show answer

   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%.

2. A land breeze typically occurs during the:

   1. Daytime, when land heats up faster than the sea
   2. Nighttime, when land cools down faster than the sea
   3. Afternoon, due to high humidity
   4. Midnight, due to low temperatures
   Show answer

   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.

3. A psychrometer is a device used to measure humidity. It typically consists of:

   1. A barometer and a thermometer
   2. A wet-bulb thermometer and a dry-bulb thermometer
   3. An anemometer and a wind vane
   4. A rain gauge and a hygrometer
   Show answer

   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.

4. The stratopause is the boundary between which two atmospheric layers?

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

   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.

5. Which gas is the second most abundant in Earth's atmosphere and is essential for respiration?

   1. Nitrogen
   2. Oxygen
   3. Argon
   4. Carbon Dioxide
   Show answer

   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.

More questions in this quiz

Answers and explanations are in the full quiz.

1. The layer of the atmosphere closest to the Earth's surface, where most weather phenomena occur, is called:
2. Which atmospheric layer contains the ozone layer, responsible for absorbing most of the Sun's harmful ultraviolet (UV) radiation?
3. Atmospheric pressure is primarily caused by:
4. At higher altitudes, atmospheric pressure decreases. This is because:
5. Which instrument is used to measure atmospheric pressure?
6. Which of the following is NOT a primary component of dry air?
7. The horizontal movement of air from an area of high pressure to an area of low pressure is known as:
8. The Coriolis effect causes winds in the Northern Hemisphere to deflect:
9. The amount of water vapor present in the air is referred to as:
10. Relative humidity is expressed as:
11. When the relative humidity reaches 100%, it means the air is:
12. The 'dew point' is the temperature at which:
13. The ozone layer is crucial for life on Earth because it absorbs:
14. Which of the following gases is considered a greenhouse gas, contributing to the warming of the Earth's atmosphere?
15. The process by which water vapor changes into liquid water is called:
16. Global wind patterns are influenced by the uneven heating of the Earth's surface and the:
17. The wind belt located at approximately 30 degrees North and South latitude, characterized by generally light and variable winds, is known as the:
18. The phenomenon where air cools as it rises and warms as it descends is known as adiabatic cooling and heating. This process is fundamental to the formation of:
19. Isobars on a weather map are lines connecting points of:
20. Which of the following gases has increased significantly in the Earth's atmosphere due to human activities, leading to concerns about climate change?
21. A 'sea breeze' blows from:
22. When air is cooled to its dew point, water vapor begins to change into liquid water. This process is called condensation and can lead to the formation of:
23. Which of the following statements about atmospheric pressure is FALSE?
24. The primary driver of atmospheric circulation, including the formation of pressure belts and wind systems, is:
25. A decrease in relative humidity would indicate that:
26. Which component of the atmosphere, though present in small amounts, is crucial for weather phenomena and the vertical temperature structure of the troposphere?
27. A high-pressure system is generally associated with:
28. The 'jet stream' is a narrow band of strong winds found in the upper troposphere and lower stratosphere. Its direction of flow is primarily from:
29. Absolute humidity measures the mass of water vapor per unit:
30. What would happen to atmospheric pressure at a specific location if a large mass of cold, dense air moved into the area?
31. The process of evaporation of water from the Earth's surface is primarily driven by:
32. The atmospheric layer characterized by decreasing temperatures with altitude and where most weather occurs is the:
33. Which of the following is a direct consequence of the Coriolis effect on large-scale wind patterns in the Southern Hemisphere?
34. When the relative humidity is 50%, it means:
35. The pressure gradient force acts to move air from:
36. In the absence of other forces, winds would blow directly from high pressure to low pressure. However, the Coriolis effect causes them to:
37. A 'monsoon' is a seasonal shift in wind direction, typically characterized by:
38. If the temperature of the air remains constant but the amount of water vapor in it doubles, the relative humidity will:
39. The Earth's atmosphere is primarily composed of gases that are transparent to visible light but absorb and re-emit infrared radiation. These gases are known as:
40. The mesosphere is notable for having the coldest temperatures in the atmosphere. The boundary at the top of the mesosphere is called the:
41. The intertropical convergence zone (ITCZ) is a belt of low pressure located near the equator. What characterizes the weather within the ITCZ?
42. If a parcel of air is lifted and cools at a rate slower than the dry adiabatic lapse rate, it implies:
43. The Earth's atmosphere contains trace amounts of which gas that is a potent greenhouse gas and plays a role in plant respiration and decomposition?

More quizzes

• Natural Regions & Map Work▶ Play
• Our World – Earth, Latitudes, Longitudes, Rotation & Revolution▶ Play

Browse all Geography quizzes

More to play