Microbes in Human Welfare Test

Result

Microbes in Human Welfare Test - 5

Score
-
out of -
Rank
-
out of -

TIME Taken - -

SHARING IS CARING

If our Website helped you a little, then kindly spread our voice using Social Networks. Spread our word to your readers, friends, teachers, students & all those close ones who deserve to know what you know now.

Weekly Quiz Competition

Question 1
4 / -1

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

A
primary sludge

B
floces

C
activated sludge

D
anaerobic sludge

Solution

Flocs are masses of bacteria held together by slime and fungal filaments to form mesh-like structures.
Question 2
4 / -1

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

A
A-Mechanical agitation; B-Increased BOD C-Activated sludge; D-Aerobic sludge digesters

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

C
A-Microbial digestion; B-Activated sludge C-Reduced BOD; D-Anaerobic sludge digesters

D
A-Microbial digestion; B-Mechanical agitation C-Reduced BOD; D-Aerobic sludge digesters

Solution

A is Mechanical agitation; B is Reduced BOD; C is Activated sludge; D is Anaerobic sludge digesters.
Question 3
4 / -1

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

A
Ganga Action Plan

B
Narmada Action Plan

C
Yamuna Action Plan

D
Both (a) and (c)

Solution

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.
Question 4
4 / -1

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

A
inactivated sludge

B
activated sludge

C
primary sludge

D
secondary sluge

Solution

Activated sludge, is formed during secondary sewage treatment. It posses flocs of decomposer microbes. Formation of activated sludge requires aeration.
Question 5
4 / -1

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

A
Flocs

B
Primary sludge

C
Activated sludge

D
Anaerobic sludge

Solution

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.
Question 6
4 / -1

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.

A
Both statements 1 and 2 are correct and statement 2 is the correct explanation of statement 1.

B
Both statements 1 and 2 are correct but statement 2 is not the correct explanation of statement 1.

C
Statement 1 is correct and statement 2 is incorrect.

D
Both statements 1 and 2 are incorrect.

Solution

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.
Question 7
4 / -1

____________ is the first step of sewage treatment.

A
Precipitation

B
Chlorination

C
Sedimentation

D
Aeration

Solution

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.
Question 8
4 / -1

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:

A
primary treatment

B
activated sludge treatment

C
tertiary treatment

D
none of these

Solution

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.
Question 9
4 / -1

The purpose of biological treatment of waste water is to

A
reduce BOD

B
increase BOD

C
reduce sedimentation

D
increase sedimentation

Solution

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.
Question 10
4 / -1

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

A
A-(vii), B-(vi), C-(v), D-(iv), E-(ii), F-(iii), G-(i)

B
A-(i), B-(iii), C-(v), D-(vii), E-(ii), F-(iv), G-(vi)

C
A-(i), B-(ii), C-(iii), D-(iv), E-(v), F-(vi), G-(vii)

D
A-(vii), B-(vi), C-(i), D-(ii), E-(iii), F-(iv), G-(v)

User

Question Analysis

Correct -
Wrong -
Skipped -

My Perfomance

Score
-
out of -
Rank
-
out of -

Re-Attempt Weekly Quiz Competition

Microbes in Human Welfare Test - 5

Result

Microbes in Human Welfare Test - 5

Score

-

Rank

-

SHARING IS CARING

Question 1

primary sludge

floces

activated sludge

anaerobic sludge

Solution

Question 2

A-Mechanical agitation; B-Increased BOD C-Activated sludge; D-Aerobic sludge digesters

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

A-Microbial digestion; B-Activated sludge C-Reduced BOD; D-Anaerobic sludge digesters

A-Microbial digestion; B-Mechanical agitation C-Reduced BOD; D-Aerobic sludge digesters

Solution

Question 3

Ganga Action Plan

Narmada Action Plan

Yamuna Action Plan

Both (a) and (c)

Solution

Question 4

inactivated sludge

activated sludge

primary sludge

secondary sluge

Solution

Question 5

Flocs

Primary sludge

Activated sludge

Anaerobic sludge

Solution

Question 6

Both statements 1 and 2 are correct and statement 2 is the correct explanation of statement 1.

Both statements 1 and 2 are correct but statement 2 is not the correct explanation of statement 1.

Statement 1 is correct and statement 2 is incorrect.

Both statements 1 and 2 are incorrect.

Solution

Question 7

Precipitation

Chlorination

Sedimentation

Aeration

Solution

Question 8

primary treatment

activated sludge treatment

tertiary treatment

none of these

Solution

Question 9

reduce BOD

increase BOD

reduce sedimentation

increase sedimentation

Solution

Question 10

A-(vii), B-(vi), C-(v), D-(iv), E-(ii), F-(iii), G-(i)

A-(i), B-(iii), C-(v), D-(vii), E-(ii), F-(iv), G-(vi)

A-(i), B-(ii), C-(iii), D-(iv), E-(v), F-(vi), G-(vii)

A-(vii), B-(vi), C-(i), D-(ii), E-(iii), F-(iv), G-(v)

User

Question Analysis

My Perfomance

Score

-

Rank

-

Results Announcement on: coming Monday

Stay Tuned: We’ll update you on your result via email or SMS.