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
Study the following for breathing of living organism. (i)its is essential for breathing of living organism. (ii)it is used to disinfect water (iii) it absorbs ultraviolet rays. (iv) its proportion in air is about 3%. Which of these statements are correct?
  • A
    (i) and (iv)
  • B
    All four
  • C
    (i),(ii),and(iii)
  • D
    (ii) and (iii)
    Correct
2
Water in a river is cleaned
  • A
    Manually
  • B
    Naturally
    Correct
  • C
    By fishes
  • D
    Frogs
3
Solid parts of sewage can be used as
  • A
    Pesticides
  • B
    Insecticides
  • C
    Fertilizers
  • D
    Manure
    Correct
4
Passing chlorine gas through drinking water to disinfect it is called
  • A
    Chlorination
    Correct
  • B
    Sterilization
  • C
    Cleaning
  • D
    Aeration
5
There is acute water shortage due to
  • A
    Global warming
  • B
    Overuse and misuse
    Correct
  • C
    Climate change
  • D
    Excess evaporation
6
The purest form of water is
  • A
    Subsoil water
  • B
    Spring water
  • C
    Rain water
    Correct
  • D
    Hand pump water
7
There is acute water shortage due to
  • A
    Climate change
  • B
    Global warming
  • C
    Excess evaporation
  • D
    Overuse and misuse
    Correct
8
Cooking oil and fats should not thrown down the drain because they can
  • A
    Make foul smell
  • B
    Kills the useful microbes
  • C
    Harden and block the pipes
    Correct
  • D
    Make unhygienic condition
9
Which one is not an organic waste?
  • A
    Paper
  • B
    DDT
    Correct
  • C
    Vegetable peels
  • D
    Cotton cloths
10
Water is natural resource which is
  • A
    Exhaustible as well as inexhaustible
  • B
    Inexhaustible
    Correct
  • C
    Exhaustible
  • D
    All of above
11
There is acute shortage of water due to
  • A
    Pollution of rivers
  • B
    Lack of technique to purify water
  • C
    Melting of ice at poles
  • D
    Growing population and overuse
    Correct
12
Tea leaves and solid remain of kitchen should thrown into
  • A
    Any where
  • B
    Sewer
  • C
    Dustbin
    Correct
  • D
    Water bodies
13
Poor sanitation and contaminated drinking water is the main source of
  • A
    Fever
  • B
    Large number of disease
    Correct
  • C
    Food for animals
  • D
    Antibiotics
14
Open drain cause ____________ condition.
  • A
    Hygienic
  • B
    Temperate
  • C
    Unhygienic
    Correct
  • D
    Humid
15
Both ground water and surface water get polluted due to
  • A
    Covered defection
  • B
    Septic tank
  • C
    Open defection
    Correct
  • D
    Sever system