The Atmosphere – Old Year Questions

1. The atmosphere is a mixture of several gases. Near the earth’s surface contains mainly:

(a) Nitrogen and oxygen
(b) Nitrogen and carbon dioxide
(c) Oxygen and carbon dioxide
(d) Ethane and oxygen

[R.A.S./R.T.S. (Pre) 1997]


2. Which gas has a maximum percentage in the atmosphere?

(a) Carbon
(b) Nitrogen
(c) Oxygen
(d) Hydrogen

[U.P.P.C.S. (Pre) 1993]


3. The correct sequence of different layers of the atmosphere from the surface of the Earth upwards is :

(a) Troposphere, Stratosphere, Ionosphere, Mesosphere
(b) Stratosphere, Troposphere, Ionosphere, Mesosphere
(c) Troposphere, Stratosphere, Mesosphere, Ionosphere
(d) Stratosphere, Troposphere, Mesosphere, Ionosphere

[I.A.S. (Pre) 1998]


4. In the vertical structure of the atmosphere, which one is the lowest layer?

(a) Stratosphere
(b) Mesosphere
(c) Troposphere
(d) Thermosphere

[U.P. R.O./A.R.O. (Re-Exam) (Pre) 2016]


5. The four layers of the atmosphere are –
1. Ionosphere
2. Mesosphere

3. Stratosphere
4. Troposphere

Their correct ascending order in terms of height is
Code :

(a) 1, 2, 3, 4
(b) 2, 1, 4, 3
(c) 4, 3, 2, 1
(d) 3, 4, 1, 2

[U.P.P.C.S. (Mains) 2005]


6. Arrange the following atmospheric zones in terms of the distance from the earth’s surface in increasing order and select the correct answer from the codes given below:
1. Thermosphere
2. Troposphere

3. Stratosphere
4. Mesosphere

Code :

(a) 1, 3, 4, 2
(b) 2, 3, 1, 4
(c) 3, 4, 2, 1
(d) 2, 3, 4, 1

[U.P.P.C.S. (Pre) (Re-Exam) 2015]


7. Most weather activity occurs in which atmospheric layer:

(a) Ozonosphere
(b) Ionosphere
(c) Troposphere
(d) Exosphere

[R.A.S./R.T.S. (Pre) 1999]


8. The stratosphere is said to be ideal for flying jet aircraft. This is because-

(a) This layer is rich in ozone which reduces fuel consumption
(b) The temperature is constant and ideal for aircraft engine efficiency
(c) This layer is out of the firing range of anti aircraft guns
(d) The absence of clouds and other weather phenomena

[Jharkhand P.C.S. (Pre) 2010]


9. The ozone layer lies in the :

(a) Troposphere
(b) Tropopause
(c) Stratosphere
(d) Photosphere

[Chhattisgarh P.C.S. (Pre) 2011, Uttarakhand P.C.S. (Pre) 2010, U.P.P.C.S. (Pre) 1997]


10. Which of the following protects life on earth from the harmful radiations of the Sun?

(a) Troposphere
(b) Ionosphere
(c) Ozone layer
(d) Mist
(e) All these.

[Chhattisgarh P.C.S (Pre) 2013]


11. The function of the ozone layer in the stratosphere is –

(a) To stabilize the global temperature
(b) To reduce the frequency of earthquake
(c) To avoid failure of monsoons
(d) To prevent ultraviolet radiation effect on the ground

[Uttarakhand P.C.S. (Pre) 2002]


12. Ozone layer refers to –

(a) The atmospheric condition of Antarctica
(b) Modern invention done on the planet Saturn
(c) The layer is about 10-20 km. below the surface of the Earth
(d) The layer of atmosphere of 15-20 km. above the surface of the Earth

[38th B.P.S.C. (Pre) 1992]


13. The height of the ozone layer above the surface of the earth is-

(a) 15-20 km
(b) 40-50 km
(c) 70-80 km
(d) 110-120 km

[41st B.P.S.C. (Pre) 1996]


14. Which one of the following layers of the atmosphere is responsible for the deflection of radio waves?

(a) Troposphere
(b) Stratosphere
(c) Mesosphere
(d) Ionosphere

[U.P.P.C.S. (Mains) 2005, I.A.S. (Pre) 1996]


15. Which layer of the atmosphere is responsible for Aurora Borealis?

(a) Troposphere
(b) Thermosphere
(c) Ionosphere
(d) Exosphere

[U.P.P.C.S (Pre) 2010]


16. Wireless communication is reflected to the earth’s surface by –

(a) Troposphere
(b) Stratosphere
(c) Ionosphere
(d) Exosphere

[U.P.P.C.S.(Pre) 2013]


17. Which layer of Atmosphere is used for Telecommunication?

(a) Troposphere
(b) Thermosphere
(c) Stratosphere
(d) Ionosphere

[Jharkhand P.C.S. (Pre) 2013]


18. In which atmospheric layer are communication satellites located?

(a) Exosphere
(b) Stratosphere
(c) Ionosphere
(d) Troposphere

[Uttarakhand P.C.S. (Pre) 2005, R.A.S./R.T.S. (Pre) 1997]


19. Which of the following is correct in matching the layer of atmosphere and its characteristics?
1. Troposphere – Weather Phenomena
2. Stratosphere – Ozone layer
3. Ionosphere – Radio waves reflected to Earth’s surface
4. Mesosphere – Aurorae
Code :

(a) 1, 2, 3 and 4
(b) 1, 2 and 4
(c) 1, 2, and 3
(d) 2 and 3

[U.P.P.C.S. (Mains) 2002]