Sewage Treatment And Energy Generation Test

Sewage Treatment And Energy Generation

This is online test 02 for CBSE class 12 Biology Microbes in Human Welfare (Sewage treatment and energy generation).. There are 10 questions in this test with each question having around four answer choices.

Questions & Answers

1
Organisms called Methanogens are most abundant in a
  • A
    Hot spring
  • B
    Polluted water
  • C
    Sulphur rock
  • D
    Cattle yard
    Correct
2
Physical removal of large and small particle from the sewage through filtration and sedimentation is called
  • A
    Primary treatment
    Correct
  • B
    Tertiary treatment
  • C
    Secondary treatment
  • D
    Quaternary treatment
3
Secondary sewage treatment is mainly a
  • A
    Biological process
    Correct
  • B
    Physical process
  • C
    Chemical process
  • D
    Mechanical process
4
During anaerobic digestion of organic waste, such as in producing biogas, which one of the following is left undergraded?
  • A
    Lignin
    Correct
  • B
    Hemi-cellulose
  • C
    Lipids
  • D
    Cellulose
5
Pollution from animal excreta and organic waste from kitchen can be most profitably minimized by
  • A
    Vermiculture
  • B
    Using them directly as biofertilizers.
  • C
    Storing them in underground storage tanks
  • D
    Using them for producing biogas
    Correct
6
Select the correct statement from the following
  • A
    Biogas is produced by the activity of aerobic bacteria on animal waste
  • B
    Activated sludge-sediment in settlement tanks of sewage treatment plant is a rich source of aerobic bacteria
    Correct
  • C
    Methanobacterium is an aerobic bacterium found in rumen of cattle
  • D
    Biogas, commonly called gobar gas, is pure methane.
7
The technology of biogas production was developed in India mainly due to the efforts of
  • A
    None of these
  • B
    ICRI and KVIC
  • C
    IARI and KVIC
    Correct
  • D
    Pusa Agriculture
8
Assertion: A small part of activated sludge is pumped back into aeration tank to serve as the inoculum. Reason: Remaining part of the sludge is pumped into large tanks called aerobic sludge digester.
  • A
    Both assertion and reason are correct
    Correct
  • B
    Assertion is correct but reason is incorrect
  • C
    Both assertion and reason is incorrect
  • D
    Assertion is incorrect and reason is correct
9
Treatment of waste water is done by heterotrophic microbes
  • A
    Artificially added in sewage water
  • B
    Naturally present in portable water
  • C
    Naturally present in sewage
    Correct
  • D
    Artificially generated in laboratory
10
Which one is the correct sequence of steps involved in sewage treatment? i. Filtration ii. Biological treatment iii. Sedimentation iv. Chlorination
  • A
    Step ii, iii, i and iv
  • B
    Step i, ii, iii and iv
  • C
    Step i, iii, ii and iv
    Correct
  • D
    Step ii, iii, i and iv