MCQ

MCQ 11 Mark

______ is not a chemical change.

A
Dissolution of ammonia in water
B
Dissolution of carbon-di-oxide in water
C
Dissolution of oxygen in water
✓
Melting of polar ice caps

Answer

Correct option: D.

Melting of polar ice caps

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MCQ 21 Mark

______ is an example of a periodic change.

✓
Earthquake
B
Formation of rainbow in sky
C
Occurrence of tides in seas
D
Showering of rain

Answer

Correct option: A.

Earthquake

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MCQ 31 Mark

The chemical change is ______.

A
water to clouds
B
growth of a tree
✓
cow dung to bio-gas.
D
ice-cream to molten ice-cream.

Answer

Correct option: C.

cow dung to bio-gas.

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MCQ 41 Mark

______ of the following are endothermic changes.

✓
Condensation and melting
B
Condensation and freezing
C
Evaporation and melting
D
Evaporation and freezing

Answer

Correct option: A.

Condensation and melting

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MCQ 51 Mark

When a woolen yarn is knitted to get a sweater, the change can be classified as ____________.

✓
physical change
B
chemical change
C
endothermic change
D
exothermic change

Answer

Correct option: A.

physical change

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MCQ 61 Mark

The simplest method of preventing rusting of iron is to coat it with oil, grease or paint. The reason being ____________

A
this layer does not allow iron to come in contact with air.
B
this layer does not allow iron to come in contact with water
✓
this layer does not allow iron to come in contact
D
this layer does not allow iron to come in contact with air and water.

Answer

Correct option: C.

this layer does not allow iron to come in contact

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MCQ 71 Mark

Vanaspathi is obtained from vegetable oils by addition of ____________ to the oils.

A
oxygen
✓
hydrogen
C
carbon dioxide
D
nitrogen

Answer

Correct option: B.

hydrogen

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MCQ 81 Mark

Which gas is produced when vinegar reacts with baking soda?

A
Hydrogen
✓
carbondioxide
C
carbon monoxide
D
oxygen

Answer

Correct option: B.

carbondioxide

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MCQ 91 Mark

Cut vegetables turn brown when exposed to air, this is due to ____________

A
evaporation
✓
oxidation
C
neutralization
D
displacement

Answer

Correct option: B.

oxidation

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MCQ 101 Mark

Which of the following is not a physical change?

A
crushing of a paper
✓
Burning of a paper
C
making boat of a paper
D
melting of butter

Answer

Correct option: B.

Burning of a paper

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MCQ 111 Mark

Large crystals of pure substances can be obtained from their solutions by the process of ____________

A
sublimation
B
evaporation
C
melting
✓
crystallization

Answer

Correct option: D.

crystallization

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MCQ 121 Mark

Beating an egg to make a cake is a ____________

A
physical change
B
reversible change
✓
chemical change
D
change in state

Answer

Correct option: C.

chemical change

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MCQ 131 Mark

Keeping a stone in sunlight for few hours is ____________

A
a physical change
B
a chemical change
✓
neither physical nor a chemical change
D
combination of physical and chemical changes

Answer

Correct option: C.

neither physical nor a chemical change

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MCQ 141 Mark

Rusting of iron is ____________

A
an irreversible chemical change
B
a reversible chemical change
✓
an irreversible chemical change
D
a reversible physical change

Answer

Correct option: C.

an irreversible chemical change

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MCQ 151 Mark

The change of state of a substance from solid to liquid and liquid to gas is ____________

✓
physical change
B
a chemical change
C
combination of a physical and chemical changes
D
none

Answer

Correct option: A.

physical change

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