CBSE NCERT Solutions for Class 7 Science Chapter 18

CBSE NCERT Solutions for Class 7 Science Chapter 18 Wastewater Story (अध्याय 18 अपशिष्ट जल की कहानी) free PDF download or View online  here. Download NCERT Solutions in PDF form updated for 2019 – 20.


CBSE NCERT Solutions for Class 7 Science Chapter 18

Wastewater Story: Question – Answers




7 Science Chapter 18: Wastewater Story

CBSE NCERT Solutions for Class 7 Science Chapter 18 Wastewater Story is given below to use online. Download links are given at the Top of the page. Visit to Class 7 Science main page.

CBSE NCERT Solutions for Class 7 Science Chapter 18 Wastewater Story
CBSE NCERT Solutions for Class 7 Science Chapter 18 in PDF




7 Science ch. 18 answers

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Important Questions with Answers
  1. Which of the following is waste water?
    (a) Water trickling from a damaged tap.
    (b) Water coming out of a shower.
    (c) Water flowing in a river.
    (d) Water coming out of a laundry.
  2. Which of the following is not a source of waste water?
    (a) Sewers
    (b) Homes
    (c) Industries
    (d) Hospitals
  3. Sewage is mainly a
    (a) liquid waste.
    (b) solid waste.
    (c) gaseous waste.
    (d) mixture of solid and gas.
  4. Which of the following is a part of inorganic impurities of the sewage?
    (a) Pesticides
    (b) Urea
    (c) Phosphates
    (d) Vegetable waste
  5. Which of the following is/are products of wastewater treatment?
    (a) Biogas
    (b) Sludge
    (c) Both biogas and sludge
    (d) Aerator
  6. The system of a network of pipes used for taking away wastewater from homes or public buildings to the treatment plant is known as
    (a) sewers.
    (b) sewerage.
    (c) transport system.
    (d) treatment plant.
  7. Open drain system is a breeding place for which of the following.
    (a) Flies
    (b) Mosquitoes
    (c) Organisms which cause diseases
    (d) All of these
  8. Pick from the following one chemical used to disinfect water.
    (a) Chlorine
    (b) Washing soda
    (c) Silica
    (d) Coal
  9. In a filtration plant water is filtered using layers of
    (a) sand and clay.
    (b) clay and fine gravel.
    (c) sand and fine gravel.
    (d) sand, fine gravel and medium gravel.
  10. Water polluted by various human activities causes a number of water borne diseases. Which of the following is not a water borne disease?
    (a) Cholera
    (b) Typhoid
    (c) Asthma
    (d) Dysentry



Answers
  • 1 (d)
  • 2 (a)
  • 3 (a)
  • 4 (c)
  • 5 (c)
  • 6 (b)
  • 7 (d)
  • 8 (a)
  • 9 (d)
  • 10 (c)

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