MCQ Questions for Class 7 Science: Ch 6 Physical and Chemical Changes

MCQ Questions for Class 7 Science: Ch 6 Physical and Chemical Changes

1. Formation of a compound is
(a) Temporary change
(b) Physical change
(c) Chemical change
(d) Reversible change
► (c) Chemical change

2. When magnesium is burnt, heat and light are produced. The burning of magnesium is a:
(a) reversible change
(b) physical change
(c) chemical and exothermic change
(d) chemical and endothermic change
► (c) chemical and exothermic change

3. Which of the following is an example of physical change?
(a) A bud turning into a flower
(b) Rusting of iron
(c) Boiling of water
(d) Ripening of a tomato
► (c) Boiling of water

4. A change in which the original substance can be obtained back by change of conditions is called:
(a) reversible change 
(b) physical change
(c) chemical change     
(d) Both (a) and (b)
► (d) Both (a) and (b)

5. Which of the following is a chemical change?
(a) Dissolving of common salt into water
(b) Changing of water into ice
(c) Melting of ice
(d) Rusting of iron
► (d) Rusting of iron

6. Hydrochloric acid is added to a beaker containing a piece of zinc. Zinc chloride is formed and hydrogen gas is released. This is an example of:
(a) a chemical reaction    
(b) a physical change
(c) Crystallization 
(d) None of these
► (a) a chemical reaction    

7. Which of the following changes is accompanied by sound?
(a) Photosynthesis
(b) Spoilage of food
(c) Explosion of fire works
(d) None of these
► (c) Explosion of fire works

8. Which of these is the smallest particle?
(a) A molecule
(b) An atom
(c) A speck of dust
(d) A water drop
► (b) An atom

9. Brown color of the apple after cutting is 
(a) Physical change
(b) Chemical change
(c) no change
(d) Biological change
► (b) Chemical change

10. A change is a chemical change when it is accompanied by:
(a) energy change
(b) formation of new substances
(c) change in chemical properties
(d) All of the above
► (d) All of the above

11. The reason for a physical change to be named as such is that the:
(a) change occurs only in physical properties
(b) transfer of energy takes place
(c) is a reversible change
(d) All of the above
► (a) change occurs only in physical properties

12. Which of the following is an example of physical change?
(a) A bud turning into flower
(b) Boiling of water
(c) Ripening of fruit
(d) Rusting of iron
► (b) Boiling of water

13. When ice is heated, it changes to water and water on further heating gets converted to steam. What happens when steam is condensed?
(a) A new substance is formed
(b) No new substance is formed
(c) Gaseous phase changes to liquid phase
(d) Both (b) and (c) are correct
► (d) Both (b) and (c) are correct

14. The product formed by dissolving a substance into another is called
(a) Solution
(b) Compound
(c) Mixture
(d) Solvent
► (a) Solution

15. In chemical change
(a) Change is reversible
(b) Molecules of a substance change
(c) Molecules of the substance do not change
(d) Substance remain same
► (b) Molecules of a substance change

16. Which of the following is a reversible change?
(a) Melting of ice
(b) Germination of seed
(c) Burning of matchstick
(d) Changing of milk into curd
► (a) Melting of ice

17. Rusting of iron is a slow change but burning of petrol is a
(a) Momentary change
(b) Physical change
(c) Fast change
(d) Periodic change
► (c) Fast change

18. Chemical change that is accompanied by evolution of heat energy is:
(a) physical chemical change
(b) exothermic chemical change
(c) endothermic chemical change
(d) None of these
► (b) exothermic chemical change

19. The shipping industry has to bear huge financial loss because of rusting of ships. The rusting of ships occur because:
(a) the body of ship is always in contact with water.
(b) the air around the ship is humid.
(c) presence of salts in sea water speed up the process of rusting.
(d) All of the above
► (d) All of the above

20. The chemical name of Baking soda is
(a) Sodium hydrogen carbonates
(b) Sodium carbonate
(c) Calcium hydrogen carbonate
(d) Calcium carbonate
► (a) Sodium hydrogen carbonates

21. Which of the following is a reversible change?
(a) Melting of ice
(b) Germination of seed
(c) Changing of milk into curd
(d) Burning of match stick
► (a) Melting of ice

22. Which of the following statements is correct?
(a) Cutting of wood into pieces is a chemical change.
(b) Conversion of manure from leaves is a physical change.
(c) Iron pipes coated with zinc do not rust easily.
(d) All of the above
► (c) Iron pipes coated with zinc do not rust easily.

23. Which is the best method to prevent rusting?
(a) Painting                      
(b) Greasing
(c) Galvanization    
(d) Precipitation
► (c) Galvanization    

24. What property stays the same during physical and chemical changes?
(a) Density
(b) Shape
(c) Mass
(d) Arrangement of particle
► (c) Mass
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