• Wastewater Management (Class VII)
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Wastewater Management (Class VII)

Description: Wastewater Management
Number of Questions: 15
Created by:
Tags: Wastewater Management Wastewater Story Sewage or Waste water Sanitation and Diseases, Sanitation at Public Places Waste water Treatment
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Waterborne diseases are transmitted through contaminated water. Which of the following is not a waterborne disease?

  1. Typhoid

  2. Hepatitis C

  3. Cholera

  4. Dysentry

  5. Hepatitis A

Show answer
Correct Option: B
Explanation:

This is the correct option. Hepatitis C is not a waterborne disease. Hepatitis C is commonly spread via direct contact with the blood of a person who has the disease.

On which of the following days is 'World Water Day' celebrated?

  1. 22nd March

  2. 11th July

  3. 7th April

  4. 5th June

  5. 1st January

Show answer
Correct Option: A
Explanation:

This is the correct option. 'World Water Day' is celebrated on 22nd March.

Which of the following are not the organic impurities of sewage?

  1. Human feces

  2. Oils

  3. Herbicides

  4. Pesticides

  5. Phosphates

Show answer
Correct Option: E
Explanation:

This is the correct option. Phosphates are not the organic impurities of sewage. They are the inorganic impurities.

Which of the following factors is/are responsible for the scarcity of fresh water?

  1. Overpopulation

  2. Increased industrial development

  3. Pollution

  4. Construction activities

  5. All of the above

Show answer
Correct Option: E
Explanation:

This is the correct option as all of the above are the factors responsible for the scarcity of fresh water.

Which of the following statements is/are false?

a. Foul-smelling gases are given off due to the decomposition of waste organic matter present in sewage by anaerobic bacteria. b. Open drains are breeding places for mosquitoes and flies that cause diseases. c. Aquatic animals die due to lack of hydrogen that is used by microorganisms decomposing the organic matter.

  1. Only a

  2. Both a and b

  3. Only b

  4. Both b and c

  5. Only c

Show answer
Correct Option: E
Explanation:

This is the correct option as this statement is false. Aquatic animals die due to lack of oxygen that is used by microorganisms decomposing the organic matter.

Microorganisms use up the water's oxygen and release poisonous gases. Which of the following gases is a poisonous gas released by microorganisms present in water?

  1. Helium

  2. Ammonia

  3. Nitrogen

  4. Hydrogen

  5. None of these

Show answer
Correct Option: B
Explanation:

This is the correct option. Ammonia is the poisonous gas released by microorganisms present in water after they use up the water's oxygen.

Which of the following is the correct full form of WWTP?

  1. World Wide Treatment Plant

  2. Waste Water Treatment Plant

  3. Waste Water Temporary Plant

  4. Waste Water Treatment Point

  5. World Water Treatment Plant

Show answer
Correct Option: B
Explanation:

This is the correct option. WWTP stands for Waste Water Treatment Plant.

Which of the following processes is/are involved in the purification of water in a WWTP?

a. Sedimentation b. Filtration c. Distillation d. Chlorination

  1. Only a

  2. Only a and b

  3. Only a, b and c

  4. Only b and d

  5. Only a, b and d

Show answer
Correct Option: E
Explanation:

This is the correct option. The treatment of sewage at WWTP involves processes like sedimentation, filtration and chlorination. 

In the tertiary treatment, which of the following gases can be used to kill the disease-causing organisms?

  1. Oxygen

  2. Hydrogen

  3. Ozone

  4. Nitrogen

  5. Helium

Show answer
Correct Option: C
Explanation:

This is the correct option. In the tertiary treatment, ozone gas can be used to kill the disease-causing organisms.

Which of the following statements is/are false?

a. Sewage system is like a transport system that carries sewage from the point of being produced to the point of disposal. b. The treatment of sewage consists of two stages - primary treatment and secondary treatment. c. Chlorination is done during the tertiary treatment stage to kill the disease-causing organisms.

  1. Only a

  2. Both a and b

  3. Only b

  4. Both b and c

  5. Only c

Show answer
Correct Option: C
Explanation:

This is the correct option as this statement is false. The treatment of sewage consists of three stages - primary treatment, secondary treatment and tertiary treatment.

Which of the following statements is/are false?

a. Discharge of treated sewer in the water bodies is the main cause of water pollution. b. In sedimentation tanks, the floating materials like oil and grease are removed by a skimmer. c. The water obtained after scraping and skimming is called clarified water.

  1. Only a

  2. Both a and b

  3. Only b

  4. Both b and c

  5. Only c

Show answer
Correct Option: A
Explanation:

This is the correct option as this statement is false. Discharge of untreated sewer in the water bodies is the main cause of water pollution.

Which of the following is not a bacterial disease?

  1. Tetanus

  2. Diphtheria

  3. Tuberculosis

  4. Polio

  5. Typhoid

Show answer
Correct Option: D
Explanation:

This is the correct option. Polio is not a bacterial disease. It is a viral disease.

Sewage is a liquid waste. Which of the following is/are included in sewage?

  1. Liquid wastes from kitchen and toilets

  2. Industrial waste

  3. Debris from roads and pathways

  4. Rainwater

  5. All of the above

Show answer
Correct Option: E
Explanation:

This is the correct option as all of the above are included in sewage.

Which of the following steps is/are not involved in the primary treatment of sewage in the treatment plant?

a. Sewage is passed through coarse screens or sieves. b. The liquid is passed through a tank that removes grit and sand. c. Chlorination is done to kill the disease causing organisms.

  1. Only a

  2. Only a and b

  3. Only b

  4. Only b and c

  5. Only c

Show answer
Correct Option: E
Explanation:

This is the correct option as this is done in the third stage of sewage treatment. In the third stage of primary treatment, the water is passed through the sedimentation tanks.

Which of the following is not a step that should be taken to maintain sanitation and avoid water pollution?

  1. It should be ensured that there are no open drains.

  2. Chemical waste from factories should be properly treated before its release into water.

  3. Proper toilet facilities should be provided to the rural people.

  4. Sewage from the cities should be discharged directly into rivers.

  5. It should be ensured that there are no leaking sewage pipes.

Show answer
Correct Option: D
Explanation:

This is the correct option as this is not a step that should be taken to maintain sanitation and avoid water pollution. Sewage from the cities should not be discharged directly into rivers. It must be treated and made harmless before its release into the rivers.

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