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Annual Examination (2021-2022), Class — VII, , Science (Set-2), Time: 1Hrs MM: 30 marks, , Q1.Answers the following questions :- (3x10=30), i. Discuss the damaging effect of Acid rain., ii. Briefly discuss the steps involved in purification of river or lake, water., iii. What are the different ways of reducing friction?, What is hypermetropia? How it is caused and corrected?, How a lightning conductor does protects a tall building?, , Give three applications of electrolysis. Discuss any one in detail., If the angle between the two mirrors is 600.Find the number of, , image formed., , A solid object weigh 200 Newton when placed on a wooden plank, the area of contact is found to be 5m2 .find the pressure exerted by, the solid object on the wooden plank?, , Draw Labeled Diagram of Human Eye, , Draw Labeled Diagram of Formation of image by a point object in, a plane mirror., , SIRS TR 2 2 a a a a a a