Recent questions tagged pollution-of-water

Description : A pond contains clean water. Which of the following activities will produce least pollution of water? a) Washing clothes in the pond c)domestic waste b) industrial waste d)Swimming in the pond

Last Answer : d)Swimming in the pond

Description : Which of the following is not a feature of potable water? a) It must be clean, colourless and odourless. b) It must be free from bacteria c) It must have excessive sodium ,calcium and magnesium d) It must contain dissolved oxygen and carbon dioxide

Last Answer : c) It must have excessive sodium ,calcium and magnesium

Description : The pollutants in water can be recognized by a) bad taste b)offensive odour c)growth of aquatic weed d)all the above

Last Answer : d)all the above

Description : When domestic sewage / fertilisers is released into rivers , the growth of algae and bacteria is a) promoted b)not affected c)inhibited d)None of the above

Last Answer : a) promoted

Description : Portable water should not have a) cannot have smell b)have impurities b) have harmful chemicals d)have microorganisms.

Last Answer : d)have microorganisms.