Class 7 Waste Water Story CBSE Questions & Answers

Class 7 · Waste Water Story

This is Science Class 7 Waste water Story CBSE Questions & Answers. There are 15 questions in this test with each question having around four answer choices.

Questions & Answers

1
Chocking of sewage is caused due to
  • A
    Plastics and other non-biodegradable items
    Correct
  • B
    Bathroom and kitchen wastes
  • C
    Vegetable and fruit peels
  • D
    All of these
2
Water treatment is the process of removing harmful substance from
  • A
    Irrigation water
  • B
    Ground water
  • C
    Drinking water
  • D
    Sewage
    Correct
3
Which one of the following organism accumulates maximum amount of toxic substance during Biomagnification?
  • A
    Human
    Correct
  • B
    Frog
  • C
    Fish
  • D
    Protozoa
4
Sewage is a
  • A
    Solid wastes
  • B
    Gaseous wastes
  • C
    Liquid wastes
    Correct
  • D
    All of these
5
water polluted by various human activities causes a number of water borne diseases.Which of the following is not a water borne disease?
  • A
    Asthma
    Correct
  • B
    cholera
  • C
    Typhoid
  • D
    Dysentry
6
Biological Oxygen Demand is _____________ in polluted water.
  • A
    Can not be calculated
  • B
    Equal to normal water
  • C
    Less
  • D
    More
    Correct
7
Algal bloom causes
  • A
    High dissolved oxygen level
  • B
    More presence of oxygen
  • C
    Less presence of oxygen
  • D
    Low dissolved oxygen level
    Correct
8
pick from the following one chemical used to disinfect water.
  • A
    silica
  • B
    Chlorine
    Correct
  • C
    wasting soda
  • D
    Coal
9
Liquid waste from houses is called
  • A
    Sewage
    Correct
  • B
    Sludge
  • C
    Smog
  • D
    Effluent
10
Dissolved and suspended impurities in sewage is called
  • A
    Contaminants
    Correct
  • B
    Sterile
  • C
    Absorbents
  • D
    Pollution
11
World water day is observed on
  • A
    It is 12 May
  • B
    It is 12 March
  • C
    It is 22 March
    Correct
  • D
    It is 22 June
12
The process of wastewater treatment is called
  • A
    Chlorination
  • B
    Water treatment
  • C
    Disinfection
  • D
    Sewage treatment
    Correct
13
Sewage contain bacteria that may cause disease like
  • A
    Jaundice and tuberculosis
  • B
    Cholera and typhoid
    Correct
  • C
    Cancer and cholera
  • D
    Skin disease and heart disease
14
The system of a network of pipes used for taking away wastewater from homes or public building to treatment plant is known as
  • A
    Sewerage
    Correct
  • B
    treatment plant
  • C
    transport system
  • D
    sewers
15
_____________ have become integral parts of life.
  • A
    Cotton
  • B
    Plastics
    Correct
  • C
    Gold
  • D
    Wood