Physical and Chemical Changes MCQs with Answers

Question-1. Magnesium hydroxide, obtained when Magnesium oxide is dissolved in water, is

1. An acid
2. an indicator
3. a dissolving agent
4. a Base

Question-2. When you leave a piece of iron in the open for some time, it acquires a film of brownish substance. The substance is called:

1. base
2. rust
3. none of these
4. acid

Question-3. The process of depositing a layer of zinc over iron is known as

1. galvanisation
2. fertilisation
3. ironing
4. aluminisation

Question-4. When Magnesium ribbon is burnt in candle flame it burns with

1. Brilliant yellow light
2. Brilliant white light
3. Brilliant Green light
4. brilliant red light

Question-5. Few example of chemical changes are:

1. food getting spoiled
2. formation of curd
3. all of these
4. burning of coal

Question-6. How crystal of pure substances are obtained?

1. By chromatography
2. By peptization
3. By all these methods
4. By crystallization

Question-7. In chemical change

1. Molecules of a substance change
2. Molecules of the substance do not change
3. Substance remain same
4. Change is reversible

Question-8. The reason for a physical change to be named as such is that the:

1. transfer of energy takes place
2. is a reversible change
3. All of the above
4. change occurs only in physical properties

Question-9. Which of the following changes can easily be reversed?

1. Physical Change
2. Both physical and chemical changes
3. Neither physical nor chemical change
4. Chemical Change

Question-10. Properties like size, shape, colour, state of a substance are

1. mental properties
2. physical properties
3. physico-chemical properties
4. chemical properties

Question-11. Which characteristic best describes a physical change?

1. Composition stays the same
2. Form stays the same
3. Mass is lost
4. Composition changes

Question-12. The process of obtaining Salt by the evaporation of sea water is called

1. Neutralisation
2. Galvanisation
3. Amalgamation
4. Crystallisation

Question-13. Which among the following is a physical change?

1. Burning of wood
2. Ripening of fruit
3. Cooking of food
4. Cutting a log of wood in small pieces

Question-14. Which property stays the same during physical and chemical changes?

1. Shape
2. Mass
3. Arrangement of particles
4. Density

Question-15. Rusting of iron objects is faster in:

1. coastal areas
2. Both (a) and (b)
3. none of these
4. deserts

Question-16. A chemical change may bring

1. change in colour
2. change in taste
3. all of these
4. evolution of gas

Question-17. The process of depositing a layer of one metal over another metal surface to protect it from rusting is called

1. Crystallisation
2. amalgamating
3. Neutralisation
4. Galvanisation

Question-18. Blue colour of the copper sulphate solution changes to Green colour when an iron nail is dropped into it due to the formation of

1. copper chloride
2. Copper iron sulphate
3. Iron chloride
4. Iron sulphate

Question-19. When Magnesium ribbon is burnt in oxygen, the product obtained is

1. Magnesium sulphate
2. Magnesium oxide
3. Iron chloride
4. Magnesium chloride

Question-20. When carbon dioxide is passed through lime water , then lime water becomes

1. shiney
2. silvery
3. Golden yellow
4. milky

Question-21. For rusting:

1. Only air is required
2. Both air and moistured are required
3. None of these
4. Only moisture is required

Question-22. Rusting occurs when iron is exposed to

1. soil and rain
2. breeze and sunlight
3. salt water and clouds
4. oxygen and water

Question-23. Which is the best method to prevent rusting?

1. Greasing
2. Galvanization
3. Precipitation
4. Painting

Question-24. Which of the following changes is accompanied by sound?

1. Spoilage of food
2. Explosion of fire works
3. None of these
4. Photosynthesis

Question-25. Which of the following is an irreversible change ?

1. Rusting
2. Chemical
3. None of these
4. Physical

Question-26. A change of state from one form to another is a

1. chemical change
2. biological change
3. state variation
4. physical change

Question-27. Neutralisation is a:

1. chemical change
2. Both (a) and (b)
3. none of these
4. physical change

Question-28. When wax vapours burns then smoke and carbon dioxide are formed which are new substances, is a:

1. chemical change
2. Both (a) and (b)
3. none of these
4. physical change

Question-29. Brown colour of the apple after cutting is

1. chemical change
2. no change
3. biological change
4. physical change

Question-30. A change in which the original substance can be obtained back by change of conditions is called:

1. physical change
2. chemical change
3. Both (a) and (b)
4. reversible change

Question-31. Metal that is made by mixing iron with carbon, nickel and manganese is called

1. German silver
2. Nichrome
3. Eureka
4. Stainless steel

Question-32. Formation of a compound is

1. Physical change
2. Chemical change
3. Reversible change
4. Temporary change

Question-33. The shipping industry has to bear huge financial loss because of rusting of ships. The rusting of ships occur because:

1. the air around the ship is humi
2. presence of salts in sea water speed up the process of rusting.
3. All of the above
4. the body of ship is always in contact with water.

Question-34. Ozone layer protects us from harmful

1. Infrared Radiation
2. Visible Radiation
3. Heat radiation
4. Ultraviolet radiation

Question-35. For protecting iron pipes from corrosion, they are coated with

1. Copper
2. Aluminium
3. Silver
4. Zinc