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
Dried slug can be used as
  • A
    Contaminants
  • B
    Insecticides
  • C
    Organic nutrients
  • D
    Manure
    Correct
2
Sewage treatment takes place in
  • A
    Either one or two steps
  • B
    Two steps
  • C
    One step
  • D
    Several steps
    Correct
3
____________ Plants are planted along the sewage treatment plant.
  • A
    Sesame
  • B
    Mango
  • C
    Eucalyptus
    Correct
  • D
    Neem
4
Sewage is mainly generated from
  • A
    Offices
  • B
    House
  • C
    Factories
    Correct
  • D
    Roads
5
Which one is not a organic impurities present in sewage?
  • A
    Polythene
    Correct
  • B
    Human faeces
  • C
    Animal wastes
  • D
    Urine
6
The process used to remove dirt and sand is called
  • A
    Aeration
  • B
    Chlorination
  • C
    Sedimentation
    Correct
  • D
    Filtration
7
Aeration of water during water treatment removes the
  • A
    Germs
  • B
    Anaerobic bacteria
    Correct
  • C
    Human excreta
  • D
    Aerobic bacteria
8
The process during waste water treatment germs are killed is
  • A
    Aeration
  • B
    Chlorination
    Correct
  • C
    Salvation
  • D
    Filtration
9
In network of sever system, Manhole are provided at
  • A
    Junction of two or more severs
    Correct
  • B
    Beginning of sever
  • C
    Any where in network
  • D
    At the end of sever
10
When sewage passes through sand and grit removal tank the speed is
  • A
    increased to pass away grit and sand
  • B
    Increased to allow settling of sand and grit
  • C
    Decreased to allow settling of sand and grit
    Correct
  • D
    decreased to pass away grit and sand
11
In settling tank, solid wastes like human faces settled at bottom that is removed with a
  • A
    Rotator
  • B
    Peddler
  • C
    Skimmer
  • D
    Scraper
    Correct
12
WWTP stands for
  • A
    Water weathering treatment plant
  • B
    Waste water treatment plant
    Correct
  • C
    Waste water transaction plant
  • D
    Waster water treatment plant
13
Treatment of waste water do not involves
  • A
    Biological treatment
  • B
    Physical treatment
  • C
    Chemical treatment
  • D
    Hormonal treatment
    Correct
14
Air is pumped into clarified water to help
  • A
    Algal growth
  • B
    Anaerobic bacteria to grow
  • C
    Aerobic bacteria to grow
    Correct
  • D
    Fungus growth
15
Absence of safe drinking water may leads to
  • A
    Wastes of time
  • B
    Poor health
  • C
    Improper sanitation
  • D
    Water born diseases
    Correct