physical & chemical changes / changes around us

physical & chemical changes / changes around us

1. Which of the follwing is reversible change ?

1) Falling leaves
2) Spoiling of milk
3) Melting of wax
4) Burning of paper

2. Which is periodic change ?

1) Sunrise
2) Tsunami
3) Train Accident
4) Earthquake

3. Which change heat released ?

1) Reversible change
2) Exothermic change
3) Endothermic change
4) All

4. Sublimation of camphor is ________ change

1) None
2) Exothermic
3) Chemical
4) Endothermic

5. Spoiling of milk is _________

1) Useful change
2) Harmful change
3) Periodic change
4) Reversible change

6. An iron wire heated which of the following statement about it is correct ?

1) no change
2) Wire contract
3) Wire expand
4) Weight of wire increased

7. Which of the following irreversible change ?

1) Folding iron wire
2) Blowing of a balloon
3) Drying cloth
4) Burning of newspaper

8. The burstimg of balloon is ________ change

1) Slow
2) Reversible
3) Irreversible
4) Useful

9. Melting of ice is which type of change ?

1) Fast
2) None
3) Reversible
4) Harmful

10. Changes vapour into water is which type of change ?

1) Harmful
2) Periodic
3) None
4) Reversible

11. Which is periodic change ?

1) Earthquakes
2) Drying cloth
3) Movement of swing
4) Cyclone

12. Which is correct statement ?

1) Volcanic eruption is non-periodic change
2) Heartbeat is example of periodic change
3) Bursting of crackers is irreversible change
4) All of these

13. Which is not physical change ?

1) freezing
2) Melting
3) burning combustion
4) condensation

14. Which is odd change in given group ?

1) Growth of plants
2) Making curd from milk
3) Rusting of iron
4) Expantion of metal rod

15. Which are examples of chemical change ?

1) a, c, d,
2) all
3) a, c, d, e
4) a, b, c, e

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