Chapter 13: Importance Of Water - Science For Grade 7(Science ) Questions and Answers

Question 1. Fluoride is also added to water, which helps in preventing
  1.    infection
  2.    sickness
  3.    fever
  4.    tooth decay
Explanation:-
Answer: Option D. -> tooth decay
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!
Question 2. The tanks that supply water to towns are built at
  1.    roofs of buildings
  2.    high towers
  3.    town level
  4.    high lands
Explanation:-
Answer: Option B. -> high towers
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!
Question 3. Polar ice caps are found near the
  1.    East and West poles
  2.    East and North poles
  3.    North and South poles
  4.    West and South poles
Explanation:-
Answer: Option C. -> North and South poles
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!
Question 4. Desalination plant is very expensive because it
  1.    uses a large amount of fuel
  2.    is built on mountains and high lands
  3.    uses electric machinery for desalination
  4.    is built with expensive material
Explanation:-
Answer: Option A. -> uses a large amount of fuel
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!
Question 5. Oil can be poison for
  1.    insect's life
  2.    aquatic life
  3.    animal's life
  4.    human life
Explanation:-
Answer: Option B. -> aquatic life
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!
Question 6. The largest ocean on earth is
  1.    Pacific Ocean
  2.    Atlantic Ocean
  3.    Antarctic Ocean
  4.    Arctic Ocean
Explanation:-
Answer: Option A. -> Pacific Ocean
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!
Question 7. The percentage of salty water is
  1.    0.8
  2.    0.9
  3.    0.95
  4.    0.97
Explanation:-
Answer: Option D. -> 0.97
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!
Question 8. The poison gets more concentrated as it moves through
  1.    water
  2.    food chain
  3.    fish body
  4.    vascular bundles in aquatic plants
Explanation:-
Answer: Option B. -> food chain
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!
Question 9. When algae grows on the surface of water, it prevents
  1.    access of bacteria in water
  2.    access of sunlight in water
  3.    growth of fungi
  4.    growth of ferns and mosses
Explanation:-
Answer: Option B. -> access of sunlight in water
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!
Question 10. As compare to hose for car washing, bucketing uses
  1.    less water
  2.    more water
  3.    equal water
  4.    maybe less water or more
Explanation:-
Answer: Option A. -> less water
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!
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