NCERT Class VII Science Solutions: Chapter 18-Wastewater Story Part 1 (For CBSE, ICSE, IAS, NET, NRA 2023)

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Question 1:

Which of the following is waste water?

  1. Water trickling from a damaged tap.
  2. Water coming out of a shower.
  3. Water flowing in a river.
  4. Water coining out of a laundry.

Answer: D

Question 2:

Sewage is mainly a

  1. Liquid waste.
  2. Solid waste.
  3. Gaseous waste.
  4. Mixture of solid and gas.

Answer: A

Question 3:

Which of the following is/are products of wastewater treatment?

  1. Biogas
  2. Sludge
  3. Both biogas and sludge
  4. Aerator

Answer: C

Question 4:

Open drain system is a breeding place for which of the following.

  1. Flics
  2. Mosquitoes
  3. Organisms which cause diseases
  4. All of these

Answer: D

Open Drain System

Question 5:

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

  1. Cholera
  2. Typhoid
  3. Asthma
  4. Dysentry

Answer: C

Question 6:

Pick from the following one chemical used to disinfect water.

  1. Chlorine
  2. Washing soda
  3. Silica
  4. Coal

Answer: A

Question 7:

The system of a network of pipes used for taking away wastewater from homes or public buildings to the treatment plant is known as

  1. Sewers
  2. Sewerage
  3. Transport system
  4. Treatment plant

Answer: B