Study in English

Class 6 Geography Lesson no 5. Winds Q.1. Rewrite the following statements after choosing the correct option. (1) When the air expands, it .............. . (a) becomes solid (b) becomes thinner (c) gets lost (d) becomes humid Ans: When the air expands, it becomes thinner . (2) From high air pressure regions, winds ............ . (a) blow to regions of still higher pressure. (b) blow towards regions of cooler air. (c) blow towards regions of low air pressure. (d) remain still. Ans: From high air pressure regions, winds blow towards regions of low air pressure. (3) In the northern hemisphere, winds blowing towards the equator .......... due to the rotation of the earth. (a) turn to the south (b) turn to the east (c) turn to the west (d) turn to the north Ans: In the northern hemisphere, winds blowing towards the equator turn to the west due to the rotation of the earth . (4) The direction of seasonal winds blowing over the Indian subcontinent during winter is

Class 7 Geography Lesson no.4. Air Pressure (Textual Question and answers, Page no. 16 to 20) Q. 1. Give reasons:  (1) Air pressure decreases with increasing  altitude. Ans: 1.The proportion of dust in the air, water vapour, heavy gases, etc. is higher in the air closer to the surface of the earth. This proportion decreases with increasing altitude.  2. As one moves higher and higher from the surface of the earth, the air becomes thinner and thinner.  3.As a result, the air pressure decreases with increasing altitude.  (2) Pressure belts oscillate . Ans:  1. The duration and the intensity of sunrays varies during particular periods of the year in both the hemispheres.  2.As a result, the locations of the temperature zones and the pressure belts dependent on the sun’s heat also vary. 3. This change is of the order of 5° to 7° towards north in Uttarayan, and 5° to 7° south in Dakshinayan.  4.In this way Pressure belts oscillate Q. 2. Give short answers to the following  questions.  (1) W

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