Class 8 Science
Question 1: How much nitrogen is present in air?
Answer: (a) 78%
Question 2: Which of these is not a greenhouse gas?
Answer: (b) Nitrogen
Question 3: Which of these can cause acid rain?
Answer: (c) Sulphur dioxide
Question 4: Firewood is generally used as fuel in which of the following?
Answer: (d) Kitchen
Question 5: Which of the following is a disease of respiratory system?
Answer: (a) Asthma
Question 6: Which system of the body is affected by jaundice?
Answer: (b) Digestive system
Question 7: Which of these cities is situated on the bank of the Ganges?
Answer: (c) Kanpur
Question 8: Eutrophication results in deficiency of which gas in water?
Answer: (d) Oxygen
Question 9: Which substance is formed after reaction between CFCs and ozone?
Answer: (a) Oxygen
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