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Test: Self Purification of Natural Streams - Civil Engineering (CE) MCQ


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9 Questions MCQ Test Environmental Engineering - Test: Self Purification of Natural Streams

Test: Self Purification of Natural Streams for Civil Engineering (CE) 2024 is part of Environmental Engineering preparation. The Test: Self Purification of Natural Streams questions and answers have been prepared according to the Civil Engineering (CE) exam syllabus.The Test: Self Purification of Natural Streams MCQs are made for Civil Engineering (CE) 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Test: Self Purification of Natural Streams below.
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Test: Self Purification of Natural Streams - Question 1

Which one of the following is the basic indicator of river health?

Detailed Solution for Test: Self Purification of Natural Streams - Question 1

The amount of dissolved Oxygen (DO) in water is one of the most commonly used indicators of a river health. Below 4 or 5 mg/l, the life forms that survive are reduced.

Test: Self Purification of Natural Streams - Question 2

What is the minimum amount of DO required for the life survival of aquatic animals?

Detailed Solution for Test: Self Purification of Natural Streams - Question 2

As DO drops below 4 or 5 mg/L the forms of life that can survive begin to be reduced. A minimum of about 2.0 mg/L of dissolved oxygen is required to maintain higher life forms.

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Test: Self Purification of Natural Streams - Question 3

In the concept of self purification of natural streams, complete the following phrase. Solution to pollution is _________

Detailed Solution for Test: Self Purification of Natural Streams - Question 3

Waste water disposal practices are based on the premise that “the solution to pollution is dilution”. In this method relatively small quantities of waste are discharged into large bodies of water.

Test: Self Purification of Natural Streams - Question 4

_____ is accomplished by the replenishment of oxygen lost to bacterial degradation of organic waste.

Detailed Solution for Test: Self Purification of Natural Streams - Question 4

The transfer of gases into and out of water is an important part of the natural purification process. Gas transfer is accomplished by the replenishment of oxygen lost to bacterial degradation of organic waste.

Test: Self Purification of Natural Streams - Question 5

On which of the following does the self purification process does not depend?

Detailed Solution for Test: Self Purification of Natural Streams - Question 5

The speed and completeness of the self purification process depend upon many factors like volume, flow rate, the turbulence of flow, variation in sunlight, etc. Aquatic species are affected by polluted streams.

Test: Self Purification of Natural Streams - Question 6

In a flowing stream, the breakdown of degradable wastes by bacteria ________ dissolved oxygen.

Detailed Solution for Test: Self Purification of Natural Streams - Question 6

In a flowing stream, the breakdown of degradable wastes by bacteria depletes dissolved oxygen. This eliminates the populations with high oxygen requirements until the stream is cleansed of wastes.

Test: Self Purification of Natural Streams - Question 7

What is the objective of water quality management?

Detailed Solution for Test: Self Purification of Natural Streams - Question 7

To control the discharge of pollutants so that the water quality is not degraded to an unacceptable extent below the natural background level is the objective of water quality management.

Test: Self Purification of Natural Streams - Question 8

The impact of pollution depends upon nature of the pollutants and the ______

Detailed Solution for Test: Self Purification of Natural Streams - Question 8

The impact of pollution depends upon nature of the pollutants and the characteristics of the river like discharge and speed of flowing water, depth of the river, type of bottom, surrounding vegetation, etc.

Test: Self Purification of Natural Streams - Question 9

Self-purification of running streams may be due to:

Detailed Solution for Test: Self Purification of Natural Streams - Question 9

Self-purification of running stream:
When the sewage effluent is disposed of in a river stream it undergoes the process of self-purification by the following natural mechanism;
Dilution & Dispersion:
In real terms, it is not the mechanism of self-purification it only reduces the potential hazard of the sewage effluent into the river stream.
Sedimentation:
As per the turbulence available in the river stream organic suspended particles get settled in it thereby helping the river water to get self purified.
Sunlight:
In the presence of sunlight, a photosynthesis reaction takes place during which O2 is released which is utilized by the micro-organism for the decomposition of organic matter thereby helping the river water to get self purified.
Oxidation & Reduction:
Decomposition of the organic matter by the action of micro-organism over the surface of the river stream and by the anaerobic micro-organism on the bed of the river collectively helps the river to get self purified.

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