Class 9 SST
Chapter 3: Atmosphere and Climate
25 MCQs with Answers
1. Which statement best explains why the atmosphere is important for life on Earth?
Answer: B. It regulates temperature and provides gases essential for life
2. Which atmospheric layer is most closely associated with clouds and weather phenomena?
Answer: C. Troposphere
3. If the amount of water vapour in the atmosphere increases, which condition is most likely to increase?
Answer: A. Humidity
4. Consider the following statements:
1. Nitrogen is the most abundant gas in the atmosphere.
2. Oxygen makes up about 21% of the atmosphere.
3. Carbon dioxide is the most abundant atmospheric gas.
Which of the statements given above are correct?
1. Nitrogen is the most abundant gas in the atmosphere.
2. Oxygen makes up about 21% of the atmosphere.
3. Carbon dioxide is the most abundant atmospheric gas.
Which of the statements given above are correct?
Answer: A. 1 and 2 only
5. Consider the following statements about climate:
1. Climate refers to long-term atmospheric conditions.
2. Climate is determined by only one factor.
3. Latitude and altitude influence climate.
Which statements are correct?
1. Climate refers to long-term atmospheric conditions.
2. Climate is determined by only one factor.
3. Latitude and altitude influence climate.
Which statements are correct?
Answer: B. 1 and 3
6. Assertion (A): Temperature generally decreases with increasing altitude.
Reason (R): The atmosphere is heated mainly from the Earth's surface.
Reason (R): The atmosphere is heated mainly from the Earth's surface.
Answer: A. Both A and R are true, and R correctly explains A
7. Assertion (A): Coastal areas generally experience a moderate climate.
Reason (R): Water heats and cools more slowly than land.
Reason (R): Water heats and cools more slowly than land.
Answer: A. Both A and R are true, and R correctly explains A
8. Assertion (A): Atmospheric pressure decreases with increasing altitude.
Reason (R): The weight of the air above decreases as altitude increases.
Reason (R): The weight of the air above decreases as altitude increases.
Answer: A. Both A and R are true, and R correctly explains A
9. Match Column I with Column II:
| Column I | Column II |
|---|---|
| 1. Barometer | a. Humidity |
| 2. Thermometer | b. Atmospheric pressure |
| 3. Hygrometer | c. Temperature |
| 4. Rain gauge | d. Rainfall |
Answer: A. 1-b, 2-c, 3-a, 4-d
10. A hill station is cooler than a nearby plain even though both receive sunlight. Which factor mainly explains this difference?
Answer: B. Altitude
11. A city located close to the sea has smaller differences between summer and winter temperatures than an inland city. What explains this?
Answer: B. Maritime influence
12. A weather report says that the relative humidity is very high and clouds are forming. Which process is most likely occurring?
Answer: A. Condensation
13. Which of the following factors affect the climate of a place?
1. Latitude
2. Altitude
3. Distance from the sea
4. Relief features
1. Latitude
2. Altitude
3. Distance from the sea
4. Relief features
Answer: D. 1, 2, 3 and 4
14. Which of the following are forms of precipitation?
1. Rain
2. Snow
3. Hail
4. Fog
1. Rain
2. Snow
3. Hail
4. Fog
Answer: B. 1, 2 and 3 only
15. Which sequence correctly represents the process involved in rainfall?
Answer: B. Evaporation → condensation → precipitation
16. Which pair is correctly matched?
Answer: B. Anemometer — Wind speed
17. Which factor is mainly responsible for the moderate climate of coastal areas?
Answer: B. Distance from the sea
18. Why does the sea influence the temperature of nearby land?
Answer: A. Water heats and cools slowly
19. The winds blowing from the sea towards the land during the day are called:
Answer: B. Sea breeze
20. Two places are located at the same latitude, but one is much higher above sea level. Which difference would most likely be observed?
Answer: A. The higher place will generally have lower temperatures
21. If greenhouse gas concentrations increase significantly, what is the most direct atmospheric consequence?
Answer: A. Greater trapping of outgoing heat
22. Which of the following statements is NOT correct?
Answer: C. Weather and climate mean exactly the same thing.
23. Which statement about the ozone layer is NOT correct?
Answer: C. It is mainly responsible for producing rainfall.
24. A meteorological station records temperature, rainfall, wind speed, humidity and atmospheric pressure every day. These observations are primarily useful for:
Answer: A. Understanding weather conditions
25. A region receives intense solar heating throughout the year and has rising warm air. Which atmospheric condition is most likely associated with this situation?
Answer: A. Low pressure
