Read the following statements.
A. A few rivers in India are like sewers.
B. Some cattle may die by feeding on plastic bags.
C. Installation of wastewater treatment plants has cleaned up most of the rivers in India.
D. Sludge is effectively utilized in the production of biogas.
Select the option which includes all correct statements.

A, B and C

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A, B and D

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B, C and D

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A, C and D

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Solution

The correct option is B A, B and D
Wastewater treatment plants are for cleaning water for human consumption and is not helpful in cleaning the entire river. A lot of rivers in India have become sewers due to the dumping of industrial wastes by factories and other forms of water pollution. Due to less amount of grazing space and increase in the usage of plastic, cattle die due to consumption of plastic. Anaerobic decomposition of municipal wastewater sludge produces biogas.

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Similar questions

Q. Read the following statements.
a. A few rivers in India are like sewers.
b. Some cattle may die by feeding on plastic bags.
c. Installation of waste water treatment plants have cleaned up most of the rivers in India.
d. Sludge is effectively utilized in the production of biogas.
Select the options which includes all correct statements.

Question 3

Which of the following is/are products of wastewater treatment?
(a) Biogas
(b) Sludge
(c) Both biogas and sludge
(d) Aerator

Question 20

Given below is a jumbled sequence of the processes involved in a wastewater treatment plant. Arrange them in their correct sequence.
(a) Sludge is scraped out and skimmer removes floating grease.
(b) Water is made to settle in a large tank with a slope in the middle.
(c) Large objects like plastic bags are removed by passing wastewater through bar screens.
(d) Sand, grit and pebbles are made to settle by decreasing the speed of incoming wastewater.
(e) Wastewater enters a grit and sand removal tank.

Q. Read the following statements (A-D) related to the composition of domestic wastewater and select the correct option stating true (T) and false (F).

A. Wastewater contains 0.3 % of impurities.
B. Suspended solids in wastewater include sand, silt and clay.
C. Colloidal materials like fecal matter, bacteria, cloth and paper fibres are present in wastewater.
D. Dissolved materials in waste water include nutrients like starch, nitrates and ammonia.

Q. Study the following statements and select the incorrect ones.

(i) Physical removal of large and small particles through filtration and sedimentation is called primary sewage treatment.
(ii) Secondary sewage treatment is mainly a mechanical process.
(iii) Activated sludge sediment in a sewage treatment plant is a rich source of aerobic bacteria.
(iv) Biogas, commonly called as gobar gas, is pure methane.

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