Layers of atmosphere

1. What is the first layer of the atmosphere?
A) Stratosphere
B) Troposphere
C) Mesosphere
D) Thermosphere

2. Which layer extends up to 12 km above Earth’s surface?
A) Stratosphere
B) Mesosphere
C) Troposphere
D) Thermosphere

3. In which layer does the temperature decrease from 17°C to -58°C?
A) Troposphere
B) Stratosphere
C) Mesosphere
D) Thermosphere

4. What is the second layer of the atmosphere?
A) Stratosphere
B) Troposphere
C) Mesosphere
D) Thermosphere

5. Which gas is the major constituent of the troposphere?
A) Oxygen
B) Nitrogen
C) Carbon dioxide
D) Ozone

6. What is the percentage of nitrogen and oxygen in the Earth’s atmosphere?
A) 90%
B) 99%
C) 80%
D) 70%

7. What is the role of carbon dioxide and water vapor in the troposphere?
A) They absorb visible light
B) They absorb infrared radiation
C) They reflect sunlight
D) They release nitrogen

8. What happens to the temperature in the troposphere as altitude increases?
A) It increases
B) It decreases
C) It remains constant
D) It fluctuates

9. At what rate does temperature decrease with altitude in the troposphere?
A) 10°C per km
B) 5°C per km
C) 6°C per km
D) 2°C per km

10. In which layer do all weather events occur?
A) Mesosphere
B) Stratosphere
C) Troposphere
D) Thermosphere

11. In which atmospheric layer do most airplanes fly?
A) Troposphere
B) Stratosphere
C) Mesosphere
D) Thermosphere

12. What is the highest temperature reached in the stratosphere?
A) 2°C
B) 20°C
C) -58°C
D) -93°C

13. Why does temperature rise in the stratosphere?
A) Due to the presence of water vapor
B) Due to the presence of ozone
C) Due to high concentration of carbon dioxide
D) Due to infrared radiation

14. In which layer does ozone absorb ultraviolet radiation?
A) Troposphere
B) Stratosphere
C) Mesosphere
D) Thermosphere

15. What type of reaction is the formation of ozone in the stratosphere?
A) Endothermic
B) Exothermic
C) Neutralization
D) Combustion

16. Where is the ozone layer located in the atmosphere?
A) Troposphere
B) Mesosphere
C) Stratosphere
D) Thermosphere

17. What temperature is reached in the lower part of the stratosphere?
A) -58°C
B) 2°C
C) 17°C
D) -93°C

18. How does temperature change with altitude in the stratosphere?
A) It decreases
B) It increases
C) It remains constant
D) It fluctuates

19. What breaks ozone into monoatomic oxygen and diatomic oxygen?
A) Visible light
B) Ultraviolet radiation
C) Infrared radiation
D) Water vapor

20. Which layer of the atmosphere lies above the stratosphere?
A) Troposphere
B) Mesosphere
C) Thermosphere
D) Ozone layer

21. What is the temperature range in the mesosphere?
A) -58°C to 2°C
B) 17°C to -58°C
C) 2°C to -93°C
D) -93°C to 500°C

22. What happens to temperature in the mesosphere as altitude increases?
A) It increases
B) It decreases
C) It remains constant
D) It fluctuates

23. What is the highest layer of the atmosphere mentioned in the passage?
A) Stratosphere
B) Mesosphere
C) Thermosphere
D) Troposphere

24. What happens to the temperature in the thermosphere?
A) It decreases
B) It increases
C) It remains constant
D) It fluctuates

25. Which gas allows visible light to pass but absorbs infrared radiation in the troposphere?
A) Nitrogen
B) Oxygen
C) Carbon dioxide
D) Argon

26. What happens to gas concentration with altitude in the troposphere?
A) It increases
B) It decreases
C) It remains constant
D) It fluctuates

27. What causes the temperature increase in the upper stratosphere?
A) Carbon dioxide absorption
B) Ozone absorbing ultraviolet radiation
C) Water vapor absorption
D) Oxygen absorbing visible light

28. In which layer is the ozone layer formed?
A) Troposphere
B) Stratosphere
C) Mesosphere
D) Thermosphere

29. What temperature is reached in the upper part of the stratosphere?
A) -93°C
B) 17°C
C) -58°C
D) 2°C

30. What is the primary source of ultraviolet radiation absorbed by ozone in the stratosphere?
A) The Moon
B) The Earth
C) The Sun
D) The Stars

---

Answers:

1. B
2. C
3. A
4. A
5. B
6. B
7. B
8. B
9. C
10. C
11. A
12. A
13. B
14. B
15. B
16. C
17. A
18. B
19. B
20. B
21. C
22. B
23. C
24. B
25. C
26. B
27. B
28. B
29. D
30. C