The municipal waste water is also known as

  • Sewage

  • Human excreta

  • Household waste

  • Organic matter

The major component of municipal waste is

  • Human excreta

  • Kitchen waste

  • Household waste

  • Sewage

Which one of the following useful organisms is not a part in production of curd/yoghurt?

  • S. thermophilus

  • Lactobacillus bulgaricus

  • Acetobactor aceti

  • Streptococcus lactis

Which one is used/regarded as biofertiliser?

  • An association between pteridophytes and cyanobacteria Anabaena

  • An association between gymnosperms and Nostoc

  • An association between legume and Rhizobium

  • All of the above

Rice wine is 

  • beer

  • wine

  • cider

  • sake

The treatment of waste water is done by

  • Heterotrophic microbes added after treatment

  • Heterotrophic microbes added during treatment

  • Heterotrophic microbes which are already present in the sewage

  • Mixotrophic bacteria present in human excreta

Methanogens are found in which organ of cattle?

  • Rumen

  • A part of stomach

  • Both A and B

  • Intestine

Physical removal of particles in waste water treatment is carried out by

  • Filtration

  • Sedimentation

  • Both A and B

  • Digesters

Floating debris is removed by

  • Sequential filtration

  • Sedimentation

  • Secondary Treatment

  • Anaerobic digestion

Grit is composed of

  • Soil

  • Small pebbles

  • Both A and B

  • Human excreta+ soil+ small pebbles

Removal of grit is carried out by

  • Sedimentation

  • Filteration

  • Primary digestion

  • Secondary digestion

The result of sedimentation results in settled solids which is known as

  • Effluent

  • Primary sludge

  • Activator

  • Both B and C

Effluent is formed in

  • Primary Settling tank

  • Colony sewage

  • Secondary Settling tank

  • Both B and C

The Biological treatment of sewage is also known as

  • Secondary Treatment

  • Primary Treatment

  • Same treatment

  • Floc treatment

In Biological treatment, the primary effluent is passed into

  • Large aeration tank

  • Large anaerobic tank

  • Small aerobic Chambers

  • Large anaerobic Chambers

The growth of Flocs is facilitated by

  • Constant agitation mechanically

  • Air is pumped

  • Both A and B

  • Filaments of algae

The significance of Flocs in secondary Treatment is not

  • Consumption of organic matter

  • Reduction of BOD

  • Reduction in polluting potential

  • Reduction of inorganic salts

BOD is

  • Amount of oxygen taken by bacteria to survive in 100mL water

  • Amount of oxygen taken by bacteria to oxidise organic matter in 1L of water

  • Amount of oxygen taken by bacteria to oxidise inorganic matter in 100mL of water

  • Amount of oxygen evolved by bacteria to oxidise organic matter of 1L water

Which of the following is not indicated by BOD test?

  • Rate of uptake of oxygen by microorganisms in a sample of water

  • A measure of organic matter present in the water

  • Polluting potential

  • Amount of Flocs

The bacterial Flocs of sewage treatment plants are allowed to settle in

  • Primary Settling Tank

  • Aeration Tank

  • Activated sludge

  • Secondary Settling tank

Activated sludge is

  • Sedimented bacterial Flocs

  • Bacterial Flocs of aeration tank

  • Anaerobic sludge

  • Effluent of primary settling tank

The activated sludge is

  • Pumped back into aeration tanks

  • Pumped into large anaerobic sludge digesters

  • Pumped into primary settling tank

  • Both A and B

The major part of activated sludge is sent to

  • Anaerobic sludge digesters

  • Aerobic sludge digesters

  • Aeration tank

  • Settling tank

From secondary settling tanks what is used as inoculum for primary settling tanks?

  • Activated sludge

  • Anaerobic bacteria

  • Fungal Filaments

  • Biogas

In anaerobic sludge digesters, the anaerobic bacteria

  • Digest Fungi

  • Digest Bacteria

  • Both A and B

  • Digest the organic matter

Methane, Hydrogen sulfide and carbon dioxide are produced in

  • Aerobic settling tanks

  • Anaerobic sludge digesters

  • Aeration tanks

  • Primary settling tanks

Which of the following is released into natural water bodies like rivers and streams?

  • Effluent of primary treatment

  • Effluent of secondary treatment

  • Settling component of secondary treatment

  • Settling component of primary treatment

Biogas is used as source of energy because it is

  • Easy to produce

  • Inflammable

  • Reactive

  • Very light

Identify the incorrectly matched pair 

1.

Baculoviruses

 Species specific, broad spectrum insecticides

2.

Trichoderma

Free living fungi common in root ecosystems

3.

Ladybird

Biocontrol of aphids

4.

Organic farming

Pests kept at manageable levels rather than completely eradicated
  • 1
  • 2
  • 3
  • 4

Microorganisms are used during which stage of the purification of the sewage water?

  • Primary treatment

  • Secondary treatment

  • None of the above

  • Both (1) and (2)

0:0:1


Answered Not Answered Not Visited Correct : 0 Incorrect : 0

Practice Botany Quiz Questions and Answers