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Changes Around Us

Explore different types of changes including physical, chemical, reversible, and irreversible changes. Learn about phase changes like melting, condensation, and evaporation, as well as processes like pasteurization and growth.

15 Questions Published
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Questions

Question 1 Multiple Choice (Single Answer)

Changing of water vapour into water is called

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

A change that occurs during a definite time interval is known as

  1. periodic change
  2. fast change
  3. non-periodic change
  4. slow change
  5. reversible change
Question 3 Multiple Choice (Single Answer)

The process of boiling of milk to kill microbes is known as

  1. contraction
  2. expansion
  3. sublimation
  4. pasteurization
  5. decomposition
Question 4 Multiple Choice (Single Answer)

Which process shows fast changes, i.e. takes less time to complete?

  1. The rusting of iron
  2. Bursting a balloon
  3. The ripening of fruits
  4. Souring of milk
  5. Growth of nail
Question 5 Multiple Choice (Single Answer)

In which of the followig process shape, size and state change without formation of new substance ?

  1. Irreversible changes
  2. Exothermic changes
  3. Physical changes
  4. Reversible changes
  5. Chemical changes
Question 6 Multiple Choice (Single Answer)

Which of the following is an inflammable substance?

  1. Propane
  2. Cotton
  3. Wood
  4. Butane
  5. Petrol
Question 7 Multiple Choice (Single Answer)

Which change occur in the melting of an ice candy ?

  1. reversible
  2. irreversible
  3. Chemical change
  4. Desirable change
  5. Undesirable change
Question 8 Multiple Choice (Single Answer)

_____________ when solid material is heated and it changes to liquid.

  1. Melting points are lower
  2. Solid molecules gain energy
  3. Molecule move near to each other
  4. Sublimation takes place
  5. Molecules lose a lot of energy
Question 9 Multiple Choice (Single Answer)

Which of the following examples belongs to a reversible change?

  1. A blacksmith changes a piece of iron into different tools
  2. Cooking
  3. Cake batter is made from eggs, flour, sugar and butter
  4. When vinegar is mixed with bicarbonate of soda
  5. The burning of wood
Question 10 Multiple Choice (Single Answer)

Which type of change is occurs because of food taken growth is increase?

  1. Growth is a reversible change.
  2. Growth is a periodic change.
  3. Growth is an irreversible change.
  4. Growth is a chemical change.
  5. Growth is a non-periodic change.
Question 11 Multiple Choice (Single Answer)

Which process includes the burning of wax?

  1. Reversible process
  2. Irreversible process
  3. Sublimation process
  4. Expansion process
  5. Decomposition process
Question 12 Multiple Choice (Single Answer)

Which change takes place in making statues out of plaster of Paris ?

  1. irreversible
  2. Physical change
  3. Endothermic change
  4. Exothermic change
  5. Reversible change
Question 13 Multiple Choice (Single Answer)

What is the name of the process of melting of ice to give water?

  1. Condensation process
  2. Expansion process
  3. Reversible process
  4. Periodic process
  5. Non-periodic process
Question 14 Multiple Choice (Single Answer)

Which is the process when milk changes into curd?

  1. Undesirable change
  2. Ireversible change
  3. Pasteurisation
  4. Desirable change
  5. Condensation
Question 15 Multiple Choice (Single Answer)

Why do we keep vegetables or fruits in a refrigerator?

  1. To prevent them from spoilage
  2. To prevent them from pasteurisation
  3. To avoid exothermic changes
  4. To avoid endothermic changes
  5. To avoid sublimation
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