Class 7 Science Chapter 13 Wastewater Story Quiz 6 (14 MCQs)

Quiz Instructions

Select an option to see the correct answer instantly.

1. How many meters does the manholes provided at every in the sewage

Correct Answer: C) 50 to 60.

2. We should not throw paints and greasy substances down the drain because

Correct Answer: B) They harden and clog the pipe.

3. Bacteria are beneficial to wastewater treatment because

Correct Answer: A) They naturally break down organic matter.

4. What is the process that takes place in the individual septic tank sewage treatment system?

Correct Answer: A) Anaerobic digestion.

5. Sewage treatment process involve

Correct Answer: D) All of these.

6. Aeration tank kills bacteria.

Correct Answer: B) False.

7. Which gas is released during treatment of sludge?

Correct Answer: A) Biogas.

8. Water polluted by various human activities causes a number of water-borne diseases. Which of the following is not a waterborne disease?

Correct Answer: D) Asthma.

9. What is the role of bacteria in the water purification process?

Correct Answer: A) Digested organic matter.

10. Which of the quality is of a wastewater?

Correct Answer: D) All the above.

11. The following are sources of industrial wastewater, EXCEPT:

Correct Answer: B) Resident Building.

12. THE PERIOD PROCLAIMED BY UNITED NATIONS AS THE INTERNATIONAL DECADE FOR ACTION ON "WATER FOR LIFE"

Correct Answer: A) 2005-2015.

13. The steps used in wastewater treatment is (are):

Correct Answer: D) All the above.

14. True Or FalseCooking oil and fats should not be thrown down the drain because they can harden and block the pipes.

Correct Answer: A) True.