CBSE Class 7 Science Changes Around Us: Physical and Chemical (Class 7 NCERT New) Quiz 4

1. Which metal is generally used for galvanisation?

A Magnesium B Aluminium C Zinc D Iron

2. What prevents the outer surface of potato from colouring?

A Grease B Cold Water C Paint D Zinc

3. Is water melting a physical or chemical change?

A Physical B Chemical

4. Is a burning candle a physical or chemical change?

A Physical B Chemical

5. Is salt dissolving in water a physical or chemical change?

A Physical B Chemical

6. What is the meaning of Irreversible ?

A Something that can return to it's normal shape B Something that can't return to it's normal shape

7. What is the meaning of Reversible ?

A Something that can't return ti it's normal shape B Something that can return to it's normal shape

8. A chemical change

A doesn't really change much. B creates a new substance C is a change in the state of matter

9. Melting chocolate is what type of change?

A Irreversible B Reversible

10. Cooking an egg is what type of change?

A Irreversible B Reversible