CBSE Questions for Class 6 Chemistry Changes Around Us Quiz 1 - MCQExams.com

Which of the following changes are irreversible?
  • Milk to paneer
  • Cow dung to biogas
  • Grain to its flour
  • All of the above
Which of the following is true?
  • Melting of ice is reversible change.
  • Burning of magnesium is reversible change.
  • Rusting of iron is reversible change.
  • All of the above.

Which of the following is not a reversible change?
  • Heating of water to steam
  • Cooking of egg to scrambled eggs
  • Heating of wax to molten wax
  • Cooling a cake
Dissolving sugar in water is a:
  • combination reaction
  • reversible change
  • decomposition reaction
  • periodic change
The germination of a seed is:
  • a physical, reversible change in which energy is produced
  • a fast, chemical reaction in which energy is released
  • a slow, irreversible, desirable, chemical change
  • a fast, irreversible, undesirable, chemical change
Our growth is a/an :
  • Physical change
  • Chemical decomposition reaction
  • Irreversible change
  • Fast reaction
Which of the following is not a reversible change ?
  • Heating of water to steam
  • Cooking of eggs to scrambled eggs
  • Heating of wax to molten wax
  • All of these are reversible changes
Making a ring from gold is a/an _____ change and making a statue from wood is a/an _____change.
  • irreversible, reversible
  • reversible, irreversible
  • irreversible, irreversible
  • reversible, reversible
A seed growing into a tree is an example of:
  • Slow physical change
  • Fast periodic change
  • Irreversible change
  • Man-made reversible change
Choose the incorrect statement(s).
  • Chemical reactions are characterized by the change in colour.
  • Chemical reactions are not alone characterized by change in state.
  • Physical changes are characterized by the change in colour of reacting substances.
  • Physical changes are not reversible.

The making of a ring from gold is a __________ change and making a statue from wood is a __________ change.
  • irreversible, reversible
  • reversible, irreversible
  • irreversible, irreversible
  • reversible, reversible
Identify the burning of wood change shown in image.
635094_0297cd7b54a645d486f2a7376175021e.png
  • Physical change
  • Chemical change
  • Both A and B
  • None of the above
Which of the following represents a reversible change?
  • A metal rod on heating expands (its length increases).
  • A metal rod on cooling contracts (its length decreases).
  • Both of the above
  • None of the above
Burnt sparklers and burnt books pages are examples of:
  • Reversible process
  • Irreversible process
  • Rusting
  • None of these
What is a reversible change?
  • A material changes permanently into a new material
  • A material changes its feel or appearance, but it is still the same material
  • A material changes into a new material, but it can be changed back
  • A material stops existing
Which of the following change cannot be reversed?
  • Hardening of cement
  • Freezing of ice cream
  • Opening a door
  • Melting of chocolate
Heating will produce what sort of change?
  • An irreversible change
  • A reversible change
  • Either a reversible or irreversible change
  • Neither a reversible or irreversible change
 Burnt crackers and burnt pages are examples of 
  • reversible change
  • irreversible change
  • no change
  • none of the above
 Iron adopts changes slowly and gradually by process of:
  • rusting
  • galvanisation
  • crystallisation
  • None of these
The change of state of water from one form to another is:
  • chemical change
  • irreversible change
  • reversible change
  • state variation
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