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Physical and Chemical Changes

Covers reversible and irreversible changes, endothermic and exothermic processes, phase changes like sublimation and deposition, and distinguishing between physical and chemical transformations in everyday phenomena.

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Questions

Question 1 Multiple Choice (Single Answer)

Which of the following is an example of periodic change?

  1. Sneezing
  2. Heartbeat
  3. Earthquake
  4. Eruption of volcano
  5. An accident
Question 2 Multiple Choice (Single Answer)

Which of the following statements describes an endothermic change?

  1. Changes in which heat is liberated.
  2. Changes which take place in few seconds.
  3. Changes which take days, months, and years to occur.
  4. Changes in which energy is absorbed.
  5. Changes which occur at fixed interval of time.
Question 3 Multiple Choice (Single Answer)

Which of the following statements does not describe physical change?

  1. Composition of substance remains same.
  2. No new substance is formed.
  3. Chemical properties of a substance change.
  4. Physical changes are reversible.
  5. Expansion of iron on heating is an example of physical change.
Question 4 Multiple Choice (Single Answer)

Digestion of food is a _____________.

  1. a physical change
  2. a temporary change
  3. a reversible change
  4. a chemical change
  5. a spontaneous change
Question 5 Multiple Choice (Single Answer)

Heating of camphor is a process of sublimation. Which of the following changes is not related to camphor sublimation?

  1. Endothermic change
  2. Physical change
  3. Natural change
  4. Fast change
  5. Reversible change
Question 6 Multiple Choice (Single Answer)

The process of converting gas directly into solid is called ___________.

  1. freezing
  2. condensation
  3. sublimation
  4. evaporation
  5. deposition
Question 7 Multiple Choice (Single Answer)

Which of the following is an exothermic change?

  1. Melting of ice cream
  2. Melting of metals
  3. Burning sugar
  4. Baking bread
  5. Evaporation of water
Question 8 Multiple Choice (Single Answer)

Metal _________ on heating.

  1. contracts
  2. changes it shape
  3. remains same
  4. expands
  5. contracts and expands
Question 9 Multiple Choice (Single Answer)

How do molecules react when solid is changed into liquid?

  1. They form a tight bond.
  2. They move apart from each other.
  3. Some have tight bond and some move apart from each other.
  4. They get packed close together.
  5. They move very far from each other.
Question 10 Multiple Choice (Single Answer)

What happens during a chemical change?

  1. There is no change in composition.
  2. A substance combines with other to form a new substance.
  3. There is no change in molecular composition.
  4. Energy is always given out.
  5. There is no change in colour.
Question 11 Multiple Choice (Single Answer)

Souring of milk is an example of __________.

  1. a periodic change
  2. a momentary change
  3. an instant change
  4. a temporary change
  5. an undesirable change
Question 12 Multiple Choice (Single Answer)

Burning of candle is a type of __________.

  1. chemical change
  2. physical change
  3. permanent change
  4. both chemical change and physical change
  5. neither chemical change nor physical change
Question 13 Multiple Choice (Single Answer)

Which of the following changes cannot be reversed?

  1. Production of charcoal
  2. Dissolving salt in water
  3. Boiling of water
  4. Melting of ice
  5. Melting wax
Question 14 Multiple Choice (Single Answer)

Which group of changes include only chemical changes?

  1. Metabolism of food in the body, electroplating a metal and crushing a can
  2. Mixing an acid and a base, baking a cake and breaking a glass
  3. Mixing an acid and a base, baking a cake, and electroplating a metal
  4. Electroplating a metal, baking a cake and crushing a can
  5. Metabolism of food in the body, burning a candle and electroplating a metal
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