CBSE Class 7 Science Physical and Chemical Changes Quiz 1

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CBSE › Class 7 › Science › Physical and Chemical Changes

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1. In which type of change a new substance is formed?

A In physical change B In chemical change C In both (a) and (b) D In neither of these

2. Which among the following is a physical change?

A Cutting a log of wood in small pieces B Burning of wood C Ripening of fruit D Cooking of food

3. Which of the following is a chemical change?

A Bursting of a fire cracker B Germination of seed C Coal formation from buried trees D All of these

4. Which is a method to prevent rust?

A Crystallization B Sedimentation C Galvanisation D None of these

5. How crystal of pure substances are obtained?

A By crystallization B By chromatography C By peptization D By all these methods

6. What is the formula of rust?

A Fe B Fe C FeO D None of these

7. What will happen if carbon dioxide gas is passed through lime water ?

A Calcium carbonate is formed B The lime water turns milky C Both of these D None of these

8. Iron pillar near the Qutub Minar in Delhi is famous for the following facts. Which of these facts is responsible for its long stability?

A It is more than 7 metres high B It weighs about 6000 kg C It was built more than 1600 years ago D It has not rusted after such a long period

9. Galvanisation is a process used to prevent the rusting of which of the following?

A Iron B Zinc C Aluminium D Copper

10. Paheli’s mother made a concentrated sugar syrup by dissolving sugar in hot water. On cooling, crystals of sugar got separated. This indicates a:

A physical change that can be reversed B chemical change that can be reversed C physical change that cannot be reversed D chemical change that cannot be reversed

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