Question

31. Which of the following is a major source of water pollution?

(a) Sulphur dioxide

(b) Nitrogen oxide

(c) DDT

(d) Hydrogen oxide

32. Increasing levels of _________ gases are leading to global warming.



33. _________ corrodes the marble of monuments.

34. . We can use any amount of chlorine to purify water.

(a) True

(b) False

35. Water which looks clean still has dissolved impurities and disease-causing microorganisms.

(a) True

(b) False



36. What is the full form of BOD?

Which of the following rivers is called the world’s most polluted river?

(a) Ganga River

(b) Chenab River

(c) Cauvery River

(d) Yamuna River

37. Which of the following are the primary causes of water pollution?

(a) Plants

(b) Animals

(c) Human activities

(d) None of these

38. Chlorofluorocarbon are nonflammable chemicals mainly used in _________.

(a) Perfumes

(b) Refrigerators

(c) Air conditioners

(d) All of the above

39. Chlorofluorocarbon are nonflammable chemicals mainly used in _________.

(a) Perfumes

(b) Refrigerators

(c) Air conditioners

(d) All of the above

40. The sound which is disagreeable to the ears is called -----​

Answer 1

Answer:

sorry

Explanation:

I don't know your questions answere sorry'bro

Answer 2

Answer:

31. Nitrogen oxide

32. Carbon dioxide co2

33. acid rains

34. false

35. true

36. biochemical of oxygen

36. Ganga river

37. Human activities

38. All of these

39. All of these

40. ultrasonic