Water – A Precious Resource | Science | Chapter 16 | Class 7th | Questions and Answers |

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 Book Cover Science Class 7th



JANDKNCERT | Science | Class 7th |

Water – A Precious Resource | Science | Chapter 16 | Class 7th | Questions and Answers |

 

    Chapter 16: Water – A Precious Resource

    EXERCISES (Questions and Answers)

     

    I. Answer the following questions in one word or a figure:

     

    Q1. What is the apparatus used for the electrolysis of water called?

    Ans. Hoffman’s Voltmeter

     

    Q2. What is the volume ratio for hydrogen to oxygen in water?

    Ans. 2:1

     

    Q3. At what temperature does water change into steam?

    Ans. 1000C

     

    Q4. At what temperature does water change into ice?

    Ans. 00C

     

    Q5. At what temperature is the density of water maximum?

    Ans. 40C

     

    Q6. What is the composition of water?

    Ans. H2O

     

    Q7. Which is lighter: water or ice?

    Ans. Ice

     

    Q8. Name the largest source of water on earth.

    Ans.Oceans

     

    Q9. Name a liquid, which is heavier than water.

    Ans. Liquid wax

     

    Q10. Name a chemical, which is used to kill germs in the water.

    Ans.Chlorine

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