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
Addition of harmful substance in water to make it unfit for human consumption is called
  • A
    Water pollution
    Correct
  • B
    Biomagnifications
  • C
    Decomposition
  • D
    Retardation
2
The substance that pollute the natural substance is called
  • A
    Magnifier
  • B
    Fertilizers
  • C
    Reactant
  • D
    Pollutant
    Correct
3
Water pollution is caused by
  • A
    Plant growing near water bodies
  • B
    Excess drawing of water from water bodies
  • C
    Addition of untreated sewage in water bodies
    Correct
  • D
    Aquatic animals living in water
4
Which of the following area is most likely to be most air polluted?
  • A
    Crop field
  • B
    Industrial area
    Correct
  • C
    Residential area
  • D
    Park
5
Which one is not a natural source of water
  • A
    Pond
  • B
    River
  • C
    Canal
    Correct
  • D
    Lake
6
Which of the following is not responsible for air pollution?
  • A
    Combustion of fossils fuel
  • B
    Chimneys of factories
  • C
    Freezing of ice
    Correct
  • D
    Burning of coal
7
Which is not produced by burning of fossils fuel?
  • A
    Nitrogen oxide
  • B
    Sulpher dioxide
  • C
    Carbon dioxide
  • D
    Oxygen
    Correct
8
The purest form of water is
  • A
    Spring water
  • B
    Subsoil water
  • C
    Hand pump water
  • D
    Rain water
    Correct
9
Which one is not an organic waste?
  • A
    DDT
    Correct
  • B
    Vegetable peels
  • C
    Paper
  • D
    Cotton cloths
10
Which one is a common source of drinking water?
  • A
    Spring water
  • B
    Sea water
  • C
    River and lake
    Correct
  • D
    Ocean water
11
The process of waste treatment is called
  • A
    Sewage treatment
    Correct
  • B
    Pollutant separation
  • C
    Chlorination
  • D
    Water treatment
12
Bacteria that decompose organic wastes are called
  • A
    All of these
  • B
    Anaerobic bacteria
    Correct
  • C
    Aerobic bacteria
  • D
    Lactobacillus bacteria
13
Percentage of nitrogen gas in air is
  • A
    82 percent
  • B
    21 percent
  • C
    78 percent
    Correct
  • D
    38 percent
14
After the treatment the treated water is released into
  • A
    Ground water
  • B
    Soil
  • C
    All of these
  • D
    Water bodies
    Correct
15
Which gas is produced on burning of fossil fuels
  • A
    Sulpher dioxide
  • B
    Oxygen
  • C
    Carbon dioxide
    Correct
  • D
    Nitrogen