Karnataka Board Class 8 Geography Chapter 3 Atmosphere Solution

Karnataka State Board Social Science Geography Class 8 Chapter 3 Atmosphere Exercise Question and Answer.

I) Fill in the blanks with suitable words :

1.) The two major gases of the atmosphere are Nitrogen and Oxygen.

2.) The lowest layer of the atmosphere is Troposphere.

3.) The average air pressure of the atmosphere at the sea level is1013.25 mb.

4.) Westerlies is also known as Anti-trade Winds.

5.) The scientific study of weather is Meteorology.

II) Answer the following questions :

6.) What is atmosphere ?

Answer – Atmosphere is a thin layer of gases, dust particles and water vapour surrounding the Earth.

7.) Name the important layers of the atmosphere.

Answer – Troposphere, Stratosphere, Mesosphere, Thermosphere (Ionosphere) and Exosphere are the important layers of the atmosphere.

8.) What is the significance of ozone layer?

Answer –Ozone layer is the most important gas which absorbs ‘ultraviolet rays’ of the sun and protect all forms of life on the Earth.

9.) What is Doldrum? Where is it found?

Answer – The equatorial low pressure belt is a zone of high temperature and low pressure is called as Doldrum. Doldrum is found are found between 300 and 350 north and south of the equator.

10.) Name the different types of planetary winds.

Answer – There are three types of planetary winds. Trade winds, Anti-trade winds and Polar winds.

11.) What are local winds? Give any two examples.

Answer – Periodic winds are the result of variation in local temperature, pressure, humidity which in turn are attributed to the formation of air currents, crossing mountain ranges, valleys and other relief barriers. Eg. 1. Land breeze 2. Sea breeze

12.) Mention the different types of clouds.

Answer – The Stratus, the Cumulus, the Cirrus and the Nimbus clouds are the different types of clouds.

13.) Distinguish between weather and climate.

Answer –Distinguish between Weather And Climate,

Weather Climate
1.      The atmospheric conditions of a smaller area at a particular time is called weather. 1.      Climate is the average condition of the atmosphere over a long period of time of a larger area.
2.      The scientific study of weather is called ‘Meteorology’.       2.The scientific study of climate is called ‘Climatology’.
3.      Eg:- Cloudy, sunny, fine weather 4.      Eg:- Equatorial climate, Tropical monsoon climate

III) Define the following :

1.) Ionosphere

Answer – Thermosphere layer lies next to Mesosphere. In this layer temperature rises drastically. It is also called ‘Ionosphere’

2.) Normal lapse rate

Answer – The decreasing rate of temperature with the increase of altitude.

3.) Torrid zone

Answer –Torrid Zone is the zone of high temperature. This region is found between 00 or Equator and Tropic of Cancer in the north and the Equator and Tropic of Capricorn in the south. This region receives direct rays of the Sun.

4.) Horse Latitudes

Answer – North sub-tropical high pressure beltis found between 300 to 350 north latitudes. This region is also popularly called Horse latitudes.

5.) Orographic rainfall

Answer – Orographic rainfall is also called ‘Mountain rainfall’ or ‘Relief rainfall’. When moisture laden air is obstructed by a mountain barrier, the air is forced to rise up.

6.) Climatology

Answer – Climate is the average condition of the atmosphere over a long period of time of a larger areascientific study of climate is called ‘Climatology’.


(1). The two major gases of the atmosphere are ______ and ______.    – Nitrogen and oxygen

(2). The lowest layer of the atmosphere is ______ .    –     Nimbus

(3). The average air pressure of the atmosphere at the sea level is _____ .  –  1013.25mb

(4). Westerlies are also known as ______.

(5). The scientific study of weather is _____.   – Meteorology

(1). What is atmosphere?

Ans:-  Atmosphere is a thin layer of gases, dust particles and water vapor surrounding the earth. This is the mixture of different gases.

(2). Name the important layers of the atmosphere.  

Ans:-  The layer of atmosphere are –

i) troposphere ii) stratosphere, iii) Mesosphere, iv) Thermosphere, v) Exosphere

(3). What is the significance of ozone layer?

Ans:- This is the layer force free clouds, This is its significance.

(5). Name the different types of planetary winds.

Ans:- There are three types of planetary winds. They are –

(i) Trade winds

(ii) Westerbies on anti trade winds

(iii) Polar winds.

(6). what are local winds? Give any two examples.

Ans:- Local winds are periodic winds. This is the result of variation in local temperature, pressure, and humidity.

Name of the some local winds are

(i) Katabatic winds

(ii) Anabatic winds

(iii) Loo

(iv) Chinook etc.

(7). Mention the different types of clouds.

Ans:- There are mainly four type of clouds and they are –

(i) Stratus

(ii) Cumulus

(iii) Cirrus

(iv) Nimbus.

(8). Distinguish between weather and climate.

Ans:-

                       Weather                 Climate
i) Atmosphere condition of small area.

ii) In the scientific study of weather is called meteorology

i) Average condition of atmosphere occur a long period.

ii) In the scientific study of climate is called climatology

Updated: April 17, 2023 — 11:29 pm

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