Class 8 Pollution Of Air And Water CBSE Questions & Answers

Class 8 · Pollution Of Air And Water

This is Science Class 8 Pollution of Air and Water CBSE Questions & Answers. There are 15 questions in this test with each question having around four answer choices.

Questions & Answers

1
Chocking of sewage is caused due to
  • A
    Vegetable and fruit peels
  • B
    All of these
  • C
    Bathroom and kitchen wastes
  • D
    Plastics and other non-biodegradable items
    Correct
2
Water treatment is the process of removing harmful substance from
  • A
    Irrigation water
  • B
    Drinking water
  • C
    Sewage
    Correct
  • D
    Ground water
3
An ambitious plan to save the river Ganga, launched in 1985 was
  • A
    Ganga Action Plan
    Correct
  • B
    Ganga Cleanness drive
  • C
    Ganga Bancho Andolon
  • D
    Save Ganga Movement
4
Water-wise habits includes
  • A
    Turns of taps while brushing
    Correct
  • B
    Bath with one bucket of water
  • C
    Drinking water properly
  • D
    Wash the flour one time in a day
5
Biological Oxygen Demand is _____________ in polluted water.
  • A
    Less
  • B
    Equal to normal water
  • C
    More
    Correct
  • D
    Cannot be calculated
6
Algal bloom causes
  • A
    Less presence of oxygen
  • B
    More presence of oxygen
  • C
    Low dissolved oxygen level
    Correct
  • D
    High dissolved oxygen level
7
Amount of water recommended by United Nation per person per day is
  • A
    40 litres
    Correct
  • B
    30 litres
  • C
    50 litres
  • D
    60 litres
8
Which type of pollution is responsible for yellowing of Taj Mahal?
  • A
    Noise pollution
  • B
    Air pollution
    Correct
  • C
    Water pollution
  • D
    Soil pollution
9
Anaerobic bacteria is used for
  • A
    Regeneration
  • B
    Fermentation
    Correct
  • C
    Fragmentation
  • D
    Respiration
10
Water from bathroom, kitchen and toilet are called
  • A
    Dirty water
  • B
    Unclean water
  • C
    Contaminated water
  • D
    Waste water
    Correct
11
Inorganic substance present in sewage includes
  • A
    Nitrate and carbonates
  • B
    Carbonates and oxides
  • C
    Phosphates and oxides
  • D
    Nitrate and phosphates
    Correct
12
Network of big and small pipes called sewers join together to form
  • A
    Dig well
  • B
    Bio-gas plant
  • C
    Sewerage
    Correct
  • D
    Septic tank
13
Which gas is responsible for acid rain?
  • A
    CO
  • B
    \({{\text{O}}_{\text{3}}}\)
  • C
    \({\text{S}}{0_{\text{2}}}\)
    Correct
  • D
    \({\text{C}}{{\text{O}}_{\text{2}}}\)
14
Chemical used for disinfecting water are
  • A
    Nitric acid and ozone
  • B
    Chlorine and hydrogen peroxide
  • C
    Nitrogen dioxide and Sulpher oxide
  • D
    Chlorine and ozone
    Correct
15
Waste water should be used after
  • A
    Removing solid wastes
  • B
    Adding manure
  • C
    Adding nutrients
  • D
    Removing pollutants
    Correct