Atmosphere — 7 World Geography PYQs with Answers | UKPSC PYQ Hub

Question 1

The function of Ozone layer in Stratosphere is to–

Accepted Answer

To prevent the ultra violet rays reaching to the earth surface. The ozone layer in the stratosphere absorbs ultraviolet rays from the sun, preventing it from reaching the earth’s surface. Some part of the ultraviolet rays affects human body and causes skin cancer.

Question 2

The thickness of ozone layer is measured in :

Accepted Answer

Dobson unit. The thickness of ozone layer is measured in Dobson unit (DU). Geography of the World

Question 3

The most abundant gas in the earth's atmosphere is

Accepted Answer

Nitrogen. Nitrogen is the most abundant gas in Earth's atmosphere. It is a chemical element found in about 78% of the earth's atmosphere. It is used in the manufacture of explosives, fertilizers, medicine, electric bulbs, ammonia.

Question 4

Which gas exists in the highest concentration in the Earth's atmosphere?

Accepted Answer

Nitrogen. Nitrogen constitutes about 78% of the earth's atmospheres. It is a Colourless, Odourless, foodless and inert gas with the highest concentration.

Question 5

What is the percentage of carbon-di-oxide gas in earth's atmosphere?

Accepted Answer

0.03%. Carbon dioxide gas is 0.03% in the earth's atmosphere. Gas Percent Nitrogen 78.08% Oxygen 20.95% Argon 0.93%

Question 6

Name the atmospheric layer that has following characteristics: I. This layer extends to a height of about 440 km. II. In this layer, temperature rises 14800C. dramatically reaching upto III. This is due the fact that the gas molecules in this layer absorb the X-rays and ultraviolet radiation of the sun. IV. It protects Earth from meteors and satellites as its.

Accepted Answer

Thermosphere. Thermosphere (Ionosphere) is that layer of the atmosphere which is spread from 80 to 400 km height. The temperature in this layer increases with height. Amazing electrical and magnetic phenomenas keep on happening in this due to its specialities. D Layer- Its height is found to be 80-96 km. High and low frequency radio waves are reflected from this layer. E-Layer- Its height is 96-144km. Medium radio waves are reflected from this layer. Northern polar lights and southern polar lights are visible in this layer. F-Layer- Its height is 144-360 km. Short radio waves are reflected form this layer. G- Layer- This is the uppermost layer of the Iono sphere. Due to which all types of waves can be reflected.

Question 7

Ozone layer is mainly made up of:

Accepted Answer

Ozone gas. The ozone layer is mainly made up of ozone gas. It is a layer of the Earth's atmosphere which is found at an altitude of 18-35 km in the stratosphere. It is made up of three molecules of oxygen. It protects humans on earth form the ultraviolet rays which comes from the sun.