Atmosphere

1. In the context of the mesosphere which of the following statements is NOT correct? [SS.C. Online CHSI. (T-1) 12.10.2020 (Shift-1)]

(a) Meteorites burn up in this layer on entering from the space.
(b) In this layer temperature rises very rapidly with increasing height.
(c) It is the third layer of the atmosphere.
(d) It is directly above the stratosphere,

Correct Answer: (b) In this layer temperature rises very rapidly with increasing height.

Solution:The mesosphere is the third layer of the atmosphere, which extends from 50 km to 85 km altitude just above the stratosphere. The temperature in this layer of the atmosphere decreases continuously with an increase in altitude.

2. The ___ layer starts at Earth's surface and extends 8 to 14.5 km high (5 to 9 miles). This part of the atmosphere is the densest and almost all weather is in this region. [Online CHSL (T-1) 15.10.2020 (Shift-1)]

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

Correct Answer: (a) Troposphere

Solution:The troposphere extends from 8 to 14.5 km (5 to 9 mi) above the Earth's surface. This part of the atmosphere is the densest and almost all seasons occur in this region. The temperature in this zone decreases by 1°C for every 165 meters of altitude.

3. Identify the element that is most prolific in the crust of the earth. [S.S.C. Online C.G.L. (T-1) 13.06.2019(Shift-I)]

(a) Silicon
(b) Hydrogen
(c) Oxygen
(d) Iron

Correct Answer: (c) Oxygen

Solution:Oxygen is the most abundant element in the Earth's outer layer because it is present in many compounds like various types of oxides, carbonates and silicates in rocks.

4. Ozone at the higher level of the atmosphere is a product of ___ acting on oxygen molecules. [S.S.C. Online C.G.L. (T-1) 6.03.2020 (Shift-II)]

(a) IR radiation (IR)
(b) gamma rays
(c) UV radiation(UV)
(d) x-rays(x)

Correct Answer: (c) UV radiation(UV)

Solution:Ozone at the higher level of the atmosphere is a product of UV radiations acting on oxygen molecules.

5. What are the gasses layers that surround the Earth called? [SSC. Online MTS (1-1) 17.09.2017 (Shift-1)]

(a) Lithosphere
(b) Atmosphere
(c) Biosphere
(d) Hydrosphere

Correct Answer: (b) Atmosphere

Solution:The layers of gas that surround the Earth are called the 'atmosphere.

6. Which of the following statements is not true about ozone? [SS.C. Online MTS (T-1) 4.10.2017 (Shift-2)]

(a) Ozone is poisonous
(b) Ozone is stable near the earth's surface
(c) Ozone absorbs harmful radiations from the sun
(d) Formula of Ozone is O

Correct Answer: (b) Ozone is stable near the earth's surface

Solution:Ozone (O,) gas is found in the Stratosphere, a layer of the atmosphere located at an altitude of 12-50 km above the Earth's surface, which prevents the sun's harmful ultraviolet radiation from reaching the Earth.

7. Ultraviolet radiation in the stratosphere is absorbed by- [S.S.C. Online C.G.L(T-1) 31.08.2016 (Shift-II)]

(a) SO
(b) Ozone
(c) Oxygen
(d) Argon

Correct Answer: (b) Ozone

Solution:Ozone is the combination of three oxygen atoms into a single molecule (O). It is a gas produced naturally in the stratosphere, where it strongly absorbs incoming UV radiation

8. Which layer of the earth's atmosphere contains the ozone layer? [SS.C. Online C.G.L.(F-1) 28.08.2016 (Shift-III) SS.C. Online Constable GD 1.03.2019 (Shift-1)]

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

Correct Answer: (d) Stratosphere

Solution:The stratosphere is a layer of the earth's atmosphere, It is the second layer of the atmosphere as you go upward. Ozone, an unusual type of oxygen molecule relatively abundant in the stratosphere, heats this layer as it absorbs energy from incoming ultraviolet radiation from the Sun

9. Most of the atmospheric Ozone is found in which layer of atmosphere? [C.P.O. S.1. 6.06.2016 (Shift-1) S.S.C. Online CHSL (T-1) 12.10.2020 (Shift-2)]

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

Correct Answer: (c) Stratosphere

Solution:Ninety percent of the ozone in the atmosphere is occupied by the stratosphere, the layer of the atmosphere between about 10 and 50 kilometers altitude.

10. The Ozone layer is present in which atmospheric layer? [S.S.C. Online CHSL (T-1) 24.01.2017(Shift-III)]

(a) Lithosphere
(b) lonosphere
(c) Stratosphere
(d) Biosphere