GEO-Chapter 4 – AIR By Avni Khetrapal

Q1- Answer the following questions.

i)                   What is atmosphere?

Ans- A huge blanket of air is called Atmosphere.

ii)                Which two gases make the bulk of the atmosphere?

Ans- Nitrogen and Oxygen are the two gases that make the bulk of the atmosphere.

iii)              Which gas creates green house effect in the atmosphere?

Ans- Carbon dioxide gas creates green house effect in the atmosphere.                            

iv)              What is weather?

Ans- Weather is day-to-day condition of the atmosphere.

v)                Name three types of rainfall?

     Ans- The three types of rainfall are: -

            1- Convectional rainfall

       2- Orographic rainfall

       3- Cyclonic rainfall

vi)              What is air pressure?

Ans- The pressure exerted by the weight of air on the earth’s surface is known as air pressure.

Q2- Tick the correct answer-

i)                   Which of the following gases protects us from harmful sunrays?

a)     Carbon dioxide             b) Nitrogen                   Öc) Ozone

ii)                The most important layer of the atmosphere is

           Öa) Troposphere                 b) Thermosphere         c) Mesosphere

iii)              Which of the following layers of the atmosphere is free from clouds?

             a) Troposphere                Öb) Stratosphere              c) Mesosphere

iv)      As we go up the layers of atmosphere, the pressure

                 a) Increases             Öb) Decreases              c) Remains the same

iv)              When precipitaton comes down to the earth in the liquid form it is      called:

            a) Cloud                    Öb) Rain                      c) Snow

Q3 Match the following:

i)   Trade Winds                        a) Seasonal Wind

ii)  Loo                                      b) Horizontal Movement of air                iii) Monsoon                             c) Permanent Wind

iv) Wind                                    d) Local Wind 

Ans-                                 

i)   Trade Winds                        c) Permanent Wind

ii)  Loo                                      d) Local Wind

iii) Monsoon                              a) Seasonal Wind

iv) Wind                                     b) Horizontal Movement of air

Q4 Give Reasons:

i)                   Wet clothes take longer time to dry on a humid day?

 

Ans- Due to water vapours in the air, humidity increases. Thus the clothes   take longer time to dry on humid day.

ii)                Amount of insolation decreases from equator towards poles?

Ans- Direct sunrays fall in the equator so there is more insolation. Whereas when we go to the poles the sunrays are very less and they reach indirectly. That is why the amount of insolation decreases from equator towards poles.