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Test: Microbes in Sewage Treatment (NCERT) - NEET MCQ


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10 Questions MCQ Test Biology Class 12 - Test: Microbes in Sewage Treatment (NCERT)

Test: Microbes in Sewage Treatment (NCERT) for NEET 2024 is part of Biology Class 12 preparation. The Test: Microbes in Sewage Treatment (NCERT) questions and answers have been prepared according to the NEET exam syllabus.The Test: Microbes in Sewage Treatment (NCERT) MCQs are made for NEET 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Test: Microbes in Sewage Treatment (NCERT) below.
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Test: Microbes in Sewage Treatment (NCERT) - Question 1

The masses of bacteria held together by slime and fungal filaments to form mesh-like structures are called as

Detailed Solution for Test: Microbes in Sewage Treatment (NCERT) - Question 1

Flocs are masses of bacteria held together by slime and fungal filaments to form mesh-like structures.

Test: Microbes in Sewage Treatment (NCERT) - Question 2

Given below is the flow chart of sewage treatment. Identify A, B, C and D and select the correct option. 

Detailed Solution for Test: Microbes in Sewage Treatment (NCERT) - Question 2

A is Mechanical agitation; B is Reduced BOD; C is Activated sludge; D is Anaerobic sludge digesters.

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Test: Microbes in Sewage Treatment (NCERT) - Question 3

Which of the following steps is taken by the Ministry of Environment and Forests to protect rivers from water pollution?

Detailed Solution for Test: Microbes in Sewage Treatment (NCERT) - Question 3

The Ministry of Environment and Forests has. initiated Ganga Action Plan and Yamuna Action Plan, to save these major rivers of our country from pollution. Under these plans, it is proposed to build a large number of sewage treatment plants so that only treated water may be discharged in the rivers.

Test: Microbes in Sewage Treatment (NCERT) - Question 4

 In the sewage treatment, bacterial flocs are allowed to sediment in a setting tank. This sediment is called as

Detailed Solution for Test: Microbes in Sewage Treatment (NCERT) - Question 4

Activated sludge, is formed during secondary sewage treatment. It posses flocs of decomposer microbes. Formation of activated sludge requires aeration.

Test: Microbes in Sewage Treatment (NCERT) - Question 5

During the primary treatment of sewage, solid particles that settle down are called

Detailed Solution for Test: Microbes in Sewage Treatment (NCERT) - Question 5

Primary or physical treatment is the process of removal of small and large, floating and suspended solids from sewage through two processes of filtration and sedimentation. First floating and suspended matter is removed through sequential filtration with progressively smaller pore filters. The sediment is called primary sludge while the supernatant is called effluent. The primary sludge traps a lot of microbes and debris. It is subjected to composting, land fill or anaerobic digestion to produce biogas and manure.

Test: Microbes in Sewage Treatment (NCERT) - Question 6

Read the following statements and select the correct option.
Statement 1:
BOD represents the amount of dissolved oxygen that would be consumed if all the organic matter in one litre of water were oxidised by microorganisms.
Statement 2: High value of BOD indicates that water is highly polluted by organic matter.

Detailed Solution for Test: Microbes in Sewage Treatment (NCERT) - Question 6

BOD (biochemical oxygen demand) refers to the amount of the oxygen that would be consumed if all the organic matter in one litre of water were oxidised by bacteria. The BOD test measures the rate of update of oxygen by microorganisms in a sample of water and thus, indirectly BOD is the measure of the organic matter present in the water. The greater the BOD of wastewater, more is its polluting potential.

Test: Microbes in Sewage Treatment (NCERT) - Question 7

____________  is the first step of sewage treatment.

Detailed Solution for Test: Microbes in Sewage Treatment (NCERT) - Question 7

Primary treatment in sewage treatment involves physical removal of particles (large and small) from the sewage through filtration and sedimentation. Initially floating debris is removed by sequential filtration. Then the grit (soil and small pebbles) are removed by sedimentation. 

Test: Microbes in Sewage Treatment (NCERT) - Question 8

A sewage treatment process in which a part of decomposer bacteria present in the wastes is recycled into the starting of the process is called as:

Detailed Solution for Test: Microbes in Sewage Treatment (NCERT) - Question 8

The activated sludge system, a part of secondary treatment is one of the widely used aerobic treatment systems for  waste water in which very vigorous aeration of the sewage is done. The sewage is passed into an aeration tank from the primary settling tank.
The flocs are allowed to settle down in secondary settling tank, the bacterial flocks are allowed to undergo sedimentation. The effluent or supernatant is  generally passed into natural water bodies like rivers and streams. The sediment of the settling tank is called activated sludge. A part of it is used as inoculum in aeration tanks. The remaining part is passed into a large tank called anaerobic sludge digesters.

Test: Microbes in Sewage Treatment (NCERT) - Question 9

The purpose of biological treatment of waste water is to

Detailed Solution for Test: Microbes in Sewage Treatment (NCERT) - Question 9

Secondary treatment of sewage (or biological treatment) deplets 90−95% of the BOD and may pathogens are removed. Reduction of BOD by 90% is achieved through mineralisation of small fraction of organic matter and convertion of large proportion to removable solids.

Test: Microbes in Sewage Treatment (NCERT) - Question 10

Match column I with column II and select the correct answer from the given codes.

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