CBSE Class 7 Science Changes Around Us: Physical and Chemical (Class 7 NCERT New) Quiz 7

1. Which of the following is an irreversible change?

A Filling air in a balloon B Melting of ice C Burning of paper D Making a toy aeroplane by folding paper

2. Which type of change is the curdling of milk?

A Reversible change B Irreversible change C Reversible as well as irreversible change D None of these

3. Which of the following changes takes place when heat is given?

A The bursting of a balloon due to filling of excess air B Crushing of coal pieces C Transformation of water into vapour D Dissolving of salt in water

4. Which of the following changes takes when some other substance is mixed with the given substance?

A Heating of iron B The grinding of wheat into flour C Curdling of milk D Folding a paper to make a paper boat

5. The burning of wood

A Can be reversed B Cannot be reversed C Can be expanded D Can be melted

6. When iron rim is heated it

A Contracts B Expands C Dissolves D Evaporates

7. When the iron blade is on the wooden handle it is fitted

A By heating then cooling B By cooling then heating C By boiling then cooling D By freezing

8. Burning of a candle is

A Only a physical change B Only a chemical change C Both physical and chemical change D None of these

9. Which of the following is an irreversible change that takes place when heat is provided to the system?

A Melting of ice B Transformation of water into steam C Burning of coal D The expansion of iron

10. Give a example of physical change

A kicking a football B burning a paper C growth of animals and plants D cooking