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Success convent higher secondary School jagdalpur, Chapter -4 Air, Question 1 : answer the following question:, ( i ) What is atmosphere ?, Ans.-A huge blanket of air by which our earth is surrounded is called atmosphere. The atmosphere have the following layers:, > Troposphere., > Mesosphere, >Thermosphere, > Stratosphere, ( ii ) Which two gases make the bulk of the atmosphere ?, Ans.-Nitrogen and oxygen make the bulk of the atmosphere., ( iii ) Which gas creates greenhouse effect in the atmosphere ?, And. -Carbon dioxide creates the greenhouse effect in the atmosphere., ( iv ) What is the weather ?, And. -Whether is hour-to-hour, day to day conditions of the atmosphere. It is short-term state of the atmosphere. It is hot or cold, wet or dry., ( v ) Name three types of rainfall ?, And. -Three types of rainfall are:, > Convectional rainfall, > Orographic rainfall, > Cyclonic rainfall, ( vi ) What is air pressure ?, And. -Air pressure is defined as the pressure exerted by the weight of air on the earth's surface., Q.2. Tick ​​the correct answer ., (i) Which of the following gases protects us from harmful sun rays ?, ( a ) Carbon dioxide ( b ) Nitrogen ( c ) Ozone, Ans . (c) Ozone, (ii) The most important layer of the atmosphere is:, Troposphere (b) Thermosphere (c) Mesosphere, Ans. (a) Troposphere, (iii) Which of the following layers of the atmosphere is free from clouds?, Troposphere (b) Stratosphere (c) Mesosphere, Ans. (b) Stratosphere, (iv) As we go up the layers of the atmosphere, the pressure:, Decreases (b) Increases (c) Remains the same, Ans. ( a) Decreases, ( v ) When precipitation comes down to the earth in the liquid form , it is called : ( a ) Snow ( b ) Cloud ( c) Rain, Ans . (c) Rain, Q.3. Match the following :, Column A. Column B, Trade Winds. (a) Incoming solar energy, Loo (b) Seasonal wind, Monsoon. (c) Horizontal movement of air, Wind (d) Layer of ozone gas, ( e ) Permanent wind, ( f ) Local wind, And. –(1)-( e) ,(2) - ( F) , (3) - (b ) , (4) – ( c ), Question 4: Give reasons., ( i ) Wet clothes take longer time to dry on a humid day ?, And. -This happens because on a humid day , there is more water in air than a sunny day . So , air can soak less water from wet clothes i.e. , rate of evaporation decreases ., ( ii ) Amount of insolation decreases from equator towards poles ?, And. -Because sun rays fall vertical on the equator while slanting on the poles.