CBSE Questions for Class 7 Biology Wastewater Story Quiz 4 - MCQExams.com

Which of the following is a part of inorganic impurities of the sewage?
  • Vegetable waste
  • Urea
  • Phosphates
  • All of the above
What is sewage?
  • The settled solids that are removed in wastewater treatment with a scraper.
  • Water from kitchen used for washing dishes
  • Wastewater released from homes, industries, hospitals and other public buildings.
  • A type of fresh water.
Three statements are provided here which define the terms - Sludge 

Pick out the correct definition for these terms. 
  • The settled solids that are removed in wastewater treatment with a scraper.
  • Water from kitchen used for washing dishes.
  • Wastewater released from homes, industries, hospitals and other public buildings.
  • None of these
Three statements are provided here which define the terms - Wastewater

Pick out the correct definition for these terms. 
  • The settled solids that are removed in wastewater treatment with a scraper.
  • Water from kitchen used for washing dishes.
  • Wastewater released from homes, industries, hospitals and other public buildings.
  • Water from the swimming pool. 
State whether the following statements are "True or False". In case a statement is false, write the correct statement. 
Wastewater could be reused. 
  • True
  • False
Why is it important to drink clean water?
  • It provides proper nourishment to human body.
  • It prevents exposure to waterborne diseases.
  • It is needed for agricultural and food production.
  • All of the above.
Which of the following factors increases the scarcity of freshwater?
  • Population growth
  • Industrial development
  • Mismanagement of water resources
  • All of the above
World Water Day is observed every year on _____.
  • 22 March
  • 22 April
  • 20 March
  • 20 April
Which of the following Organization named 2005-2015 decade as "International Decade for clean water"?
  • Non-governmental organizations
  • International Population Services
  • United Nations
  • Centers for Disease Control and Prevention (CDC)
All efforts made during the decade 2005-2015 for action on "Water for Life" aim to reduce half the number of people who do not have access to safe drinking water.
  • True
  • False
Which period is proclaimed as the International Decade for action on “Water for life”?
  • 2010-2020
  • 1990-2000
  • 2001-2010
  • 2005-2015
Manholes are located at every 50m to 60m in the sewerage.
  • True
  • False
Cleaning of water is a process of removing pollutants before it enters a water body or is reused.
  • True
  • False
Why is it essential to remove pollutants from wastewater before it enters a water body or reused?
  • It can cause environmental damage to water bodies.
  • Proper sanitation is not needed.
  • Effects on wildlife dependent on water.
  • Both options A and C are correct.

What happens MANY times before the water can be returned to the water bodies?
  • It is cleaned.
  • It is disinfected
  • It is checked.
  • All of the above

The process of settling down of particles of a solid in a liquid is_________.


  • Sedimentation
  • Filtration
  • Sublimation
  • Decantation
What will happen if people around the world have no access to safe drinking water?
  • It will lead to outbreak of water related diseases.
  • Population will increase.
  • Economy will be developed.
  • All of the above

What is a sewage treatment plant?
  • The place where water is cleaned, filtered and tested before re-entering the water bodies.
  • The place where water is cleaned, filtered and tested before going to our houses.
  • The network of pipes that carry sewage (dirty water) from our houses.
  • The place where water is bottled for drinking.
What is the sewage network?
  • The place where water is cleaned before being returned to rivers.
  • The place where all our sewage is cleaned.
  • The pipes that carry sewage (dirty water) from our houses to the sewage treatment plant.
  • The place where water is cleaned before being returned to our taps.
What happen if drainage is not properly dispose off-sewage?
  • We will not get clean water.
  • Diseases will spread.
  • Water will get polluted.
  • All the above
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