Grit is composed of

(1) Soil

(2) Small pebbles

(3) Both A and B

(4) Human excreta+ soil+ small pebbles

Subtopic:  Microbes in Sewage Treatment |
 89%
From NCERT
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Removal of grit is carried out by

(1) Sedimentation

(2) Filteration

(3) Primary digestion

(4) Secondary digestion

Subtopic:  Microbes in Sewage Treatment |
 79%
From NCERT
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The result of sedimentation results in settled solids which is known as

(1) Effluent

(2) Primary sludge

(3) Activator

(4) Both B and C

Subtopic:  Microbes in Sewage Treatment |
 73%
From NCERT
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Effluent is formed in

(1) Primary Settling tank

(2) Colony sewage

(3) Secondary Settling tank

(4) Both B and C

Subtopic:  Microbes in Sewage Treatment |
 76%
From NCERT
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The Biological treatment of sewage is also known as

(1) Secondary Treatment

(2) Primary Treatment

(3) Same treatment

(4) Floc treatment

Subtopic:  Microbes in Sewage Treatment |
 90%
From NCERT
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In Biological treatment, the primary effluent is passed into

(1) Large aeration tank

(2) Large anaerobic tank

(3) Small aerobic Chambers

(4) Large anaerobic Chambers

Subtopic:  Microbes in Sewage Treatment |
 89%
From NCERT
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The growth of Flocs is facilitated by

(1) Constant agitation mechanically

(2) Air is pumped

(3) Both A and B

(4) Filaments of algae

Subtopic:  Microbes in Sewage Treatment |
 91%
From NCERT
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The significance of Flocs in secondary Treatment is not

(1) Consumption of organic matter

(2) Reduction of BOD

(3) Reduction in polluting potential

(4) Reduction of inorganic salts

Subtopic:  Microbes in Sewage Treatment |
 68%
From NCERT
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BOD is

(1) Amount of oxygen taken by bacteria to survive in 100mL water

(2) Amount of oxygen taken by bacteria to oxidise organic matter in 1L of water

(3) Amount of oxygen taken by bacteria to oxidise inorganic matter in 100mL of water

(4) Amount of oxygen evolved by bacteria to oxidise organic matter of 1L water

Subtopic:  Microbes in Sewage Treatment |
 85%
From NCERT
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Which of the following is not indicated by BOD test?

(1) Rate of uptake of oxygen by microorganisms in a sample of water

(2) A measure of organic matter present in the water

(3) Polluting potential

(4) Amount of Flocs

Subtopic:  Microbes in Sewage Treatment |
 83%
From NCERT
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