1. Which of the following is a physical change?
(A) Melting of ice
(B) Rusting of iron
(C) Burning of wood
(D) Cooking an egg
2. Which of these represents a chemical change?
(A) Boiling of water
(B) Tearing of paper
(C) Dissolving sugar in water
(D) Baking a cake
3. What is a key sign of a chemical change?
(A) Change in state
(B) Formation of a new substance
(C) Change in shape
(D) Change in size
4. Which of the following is a chemical change?
(A) Freezing water
(B) Cutting wood
(C) Rusting of a nail
(D) Breaking glass
5. Dissolving salt in water is a:
(A) Physical change
(B) Chemical change
(C) Both physical and chemical change
(D) Irreversible change
6. Which change is usually irreversible?
(A) Melting
(B) Freezing
(C) Burning
(D) Boiling
7. Which of the following is an example of a physical change?
(A) Cooking rice
(B) Ripening of fruit
(C) Burning a candle
(D) Condensation of steam
8. A chemical change involves:
(A) A temporary change
(B) A change in state only
(C) The formation of a new substance with new properties
(D) No change in energy
9. Which of the following is not a chemical change?
(A) Milk turning sour
(B) Ice melting
(C) Iron nail rusting
(D) Paper burning
10. Which statement is true about physical changes?
(A) They always produce a new substance
(B) They are always irreversible
(C) They involve changes in the identity of a substance
(D) They may involve a change in appearance, but not in composition