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
Which of the following gas is most harmful to us?
  • A
    Nitrogen
  • B
    Carbon dioxide
  • C
    Helium
  • D
    Carbon monoxide
    Correct
2
_____________ Plants are planted along the sewage treatment plant.
  • A
    Eucalyptus
    Correct
  • B
    Mango
  • C
    Sesame
  • D
    Neem
3
Aeration of water during water treatment removes the
  • A
    Germs
  • B
    Human excreta
  • C
    Aerobic bacteria
  • D
    Anaerobic bacteria
    Correct
4
The process during waste water treatment germs are killed is
  • A
    Filtration
  • B
    Salvation
  • C
    Aeration
  • D
    Chlorination
    Correct
5
In network of sever system, Manhole are provided at
  • A
    Anywhere in network
  • B
    At the end of sever
  • C
    Junction of two or more severs
    Correct
  • D
    Beginning of sever
6
WWTP stands for
  • A
    Waste water treatment plant
    Correct
  • B
    Water weathering treatment plant
  • C
    Waste water treatment plant
  • D
    Waste water transaction plant
7
Treatment of waste water do not involves
  • A
    Hormonal treatment
    Correct
  • B
    Biological treatment
  • C
    Physical treatment
  • D
    Chemical treatment
8
Absence of safe drinking water may leads to
  • A
    Improper sanitation
  • B
    Poor health
  • C
    Wastes of time
  • D
    Water born diseases
    Correct
9
The water that is purified and fit for drinking is called
  • A
    Portable water
    Correct
  • B
    Saline water
  • C
    Pure water
  • D
    Drinking water
10
Water in a river is cleaned
  • A
    Frogs
  • B
    Manually
  • C
    Naturally
    Correct
  • D
    By fishes
11
River Yamuna is polluted near Delhi due to
  • A
    Water animals
  • B
    Addition of untreated sewage
    Correct
  • C
    Rivers joining it
  • D
    Thermal plant on its bank
12
Water is chlorinated to
  • A
    Kill germs
    Correct
  • B
    Soften it
  • C
    Change colour
  • D
    Improve its taste
13
Water can be conserved by
  • A
    Water cycle
  • B
    Filtration
  • C
    Purification
  • D
    Rain water harvesting
    Correct
14
Sea water is unfit for drinking because it contain
  • A
    Dead plants and animals
  • B
    Rain water
  • C
    Dissolved organic matter
  • D
    Large amount of salt
    Correct
15
Which of the following is a respiratory disease caused by polluted air?
  • A
    Blood pressure
  • B
    Jaundice
  • C
    Goiter
  • D
    Asthma
    Correct