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
Liquid waste from houses is called
  • A
    Sludge
  • B
    Smog
  • C
    Effluent
  • D
    Sewage
    Correct
2
Biodegradable waste
  • A
    Enters the food chains then causes bio magnification
  • B
    Does not decompose
  • C
    Accumulates in environment
  • D
    Decomposes in nature by microbes
    Correct
3
Polythene and plastics
  • A
    Are non-biodegradable and very harmful
    Correct
  • B
    Do not generate any bad odour
  • C
    Are not harmful
  • D
    Degrade in the environment very easily
4
Which of the following is non-biodegradable waste?
  • A
    Vegetable and fruit peels.
  • B
    Plastic
    Correct
  • C
    Plants and animals excreta
  • D
    Cotton cloths
5
Which one is not an organic waste?
  • A
    Vegetable peels
  • B
    DDT
    Correct
  • C
    Paper
  • D
    Cotton cloths
6
Sanitation in the cities is the function of
  • A
    Municipal corporation
    Correct
  • B
    Individual person
  • C
    Non-government organisation
  • D
    Societies of locality
7
The process of waste treatment is called
  • A
    Chlorination
  • B
    Pollutant separation
  • C
    Water treatment
  • D
    Sewage treatment
    Correct
8
Bacteria that decompose organic wastes are called
  • A
    Aerobic bacteria
  • B
    All of these
  • C
    Anaerobic bacteria
    Correct
  • D
    Lactobacillus bacteria
9
Biodegradable wastes are generally
  • A
    Organic
    Correct
  • B
    Blended
  • C
    Synthetic
  • D
    Inorganic
10
A non-biodegradable item
  • A
    Can be recycled
    Correct
  • B
    Can be reused
  • C
    Can be exhaustible
  • D
    Can not be recycled
11
Which of the following is non-biodegradable?
  • A
    Leather shoes
  • B
    Cardboard
  • C
    Glass bottle
    Correct
  • D
    Cotton cloth
12
An example of source reduction of waste is
  • A
    Throwing things that are old
  • B
    Backward composting
    Correct
  • C
    Burning
  • D
    Making paper aero planes
13
Which of the following is not an example of municipal solid waste?
  • A
    Sewage
    Correct
  • B
    Paper
  • C
    Batteries
  • D
    Packing materials
14
Which of the following is biodegradable?
  • A
    Aluminium
  • B
    Aluminium foil
  • C
    Plastic bottle
  • D
    Orange peels
    Correct
15
Addition of harmful substance in water leads to
  • A
    Microbial growth
  • B
    Water pollution
    Correct
  • C
    Algal bloom
  • D
    High oxygen demand