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
Drainage system failure in a cities may cause
  • A
    Shortage of water
  • B
    Hygienic condition
  • C
    Water logging on street
    Correct
  • D
    Epidemic
2
Sewer system is useful in
  • A
    Winter season only
  • B
    Rainy season only
  • C
    All seasons
    Correct
  • D
    Summer season only
3
Composting method in which earthworm is used
  • A
    Vermicomposting
    Correct
  • B
    Manuring
  • C
    Decomposing
  • D
    Composting
4
Which of these diseases may happen due to drinking of contaminated water?
  • A
    Cholera
    Correct
  • B
    Malaria
  • C
    Pneumonia
  • D
    Small pox
5
Soap do not form foam with
  • A
    Pond water
  • B
    Cold water
  • C
    Hard water
    Correct
  • D
    Hot water
6
which of following is/are product of wastewater treatment?
  • A
    Both biogas and sludge
    Correct
  • B
    Aerator
  • C
    biogas
  • D
    sludge
7
Which of the following can not be used for composting?
  • A
    Plastic bag
    Correct
  • B
    Rotten banana
  • C
    Vegetable peels
  • D
    Fruits peels
8
Which one is the most common cause of contamination of water in rural area?
  • A
    Soil present around the water bodies
  • B
    Defection in or around water bodies
    Correct
  • C
    Presence of aquatic organisms
  • D
    Addition of manure in field near water bodies
9
River water is unfit for drinking because it has
  • A
    Suspended impurities and pollutants
    Correct
  • B
    Aquatic organism
  • C
    More salts than required
  • D
    All of these
10
open drain system is a breeding place for which of the following?
  • A
    Mosquitoes
  • B
    All of these
  • C
    Flies
  • D
    organism which cause diseases
    Correct
11
Water management is the process of
  • A
    Judicious and careful use of water
    Correct
  • B
    Purification of water
  • C
    Water cycling
  • D
    Equitable distribution of water
12
The area where garbage is collected and decomposed is called
  • A
    Dustbin
  • B
    Landfills
    Correct
  • C
    All of these.
  • D
    Compost
13
DDT is used as
  • A
    Herbicides
  • B
    Antibiotic
  • C
    Medicine
  • D
    Pesticides
    Correct
14
Accumulation of harmful non-biodegradable chemicals in food chain is called
  • A
    Expedition
  • B
    Fertilization
  • C
    Biomagnification
    Correct
  • D
    Bio-fertilization
15
Sewage treatment plants removes
  • A
    Solid, liquid and chemical wastes
    Correct
  • B
    Only liquid wastes
  • C
    Only chemical wastes
  • D
    Only solid wastes