Physical and Chemical Changes Test

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Physical and Chemical Changes Test - 1

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Question 1
1 / -0

Souring of milk is a

A
Desirable change

B
Undesirable change

C
Periodic change

D
Physical change

Solution

Explanation:

Souring of milk causes chemical changes in the milk making it unfit for consumption
Question 2
1 / -0

Which of the following is an example of physical change?

A
Rusting of iron

B
Ripening of a tomato

C
A bud turning into a flower

D
Boiling of water

Solution

Explanation:

Boiling of water is a physical change as water vapour can be changed into water again by cooling.
Question 3
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When water freezes it undergoes a

A
Chemical change

B
Vaporisation

C
Physical change

D
Sublimation

Solution

Explanation:

When water freezes it undergoes a physical change and no new substance is formed.
Question 4
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Which of the following is an example of physical change?

A
A bud turning into a flower

B
Boiling of water

C
Rusting of iron

D
Ripening of a tomato

Solution

Explanation:

Boiling water does not involve the formation of a new substance with new properties but a bud turning into a flower, rusting of iron and ripening of a tomatoes forms a new substance.
Question 5
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In a chemical change

A
Molecule of substance do not change

B
Change is reversible

C
Molecule of substance change

D
Substance remain the same

Solution

Explanation:

The molecules of a substance changes during a chemical reaction as the arragement of atoms of the reacting substances changes.
Question 6
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Which of the following is an example of chemical change?

A
Melting of wax

B
Heating of iron rod

C
Woollen yarn to knitted sweater

D
Burning of candle wick

Solution

Explanation:

Burning of a candle wick produces a new substance and it is irreversible. therefore it is a chemical change.
Question 7
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Which of the following is a reversible change?

A
Melting of ice.

B
Germination of seed

C
Changing of milk into curd

D
Burning of match stick

Solution

Explanation:

Melting of ice does not involve formation of a new substance with different properties, while burning of a matchstick, turning of milk into curds and germination of a seed involves formation of a new substance.
Question 8
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Sea water is a

A
Compound

B
Molecule

C
Element

D
Mixture

Solution

Explanation:

Sea water is a mixture because sea water contain a number of salts dissolved in it.
Question 9
1 / -0

Which of the following is an example of physical change?

A
Rusting of iron

B
Ripening of fruit

C
A bud turning into flower

D
Boiling of water

Solution

Explanation:

Boiling of water is an example of physical change but bud turning into flower, rusting of iron and ripening of fruit is chemical change.
Question 10
1 / -0

In chemical change

A
Molecules of the substance do not change

B
Molecules of a substance change

C
Change is reversible

D
Substance remain same

Solution

Explanation:

In chemical changes, molecules of substance rearrange to form a new substance with different property.

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Physical and Chemical Changes Test - 1

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Physical and Chemical Changes Test - 1

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SHARING IS CARING

Question 1

Desirable change

Undesirable change

Periodic change

Physical change

Solution

Question 2

Rusting of iron

Ripening of a tomato

A bud turning into a flower

Boiling of water

Solution

Question 3

Chemical change

Vaporisation

Physical change

Sublimation

Solution

Question 4

A bud turning into a flower

Boiling of water

Rusting of iron

Ripening of a tomato

Solution

Question 5

Molecule of substance do not change

Change is reversible

Molecule of substance change

Substance remain the same

Solution

Question 6

Melting of wax

Heating of iron rod

Woollen yarn to knitted sweater

Burning of candle wick

Solution

Question 7

Melting of ice.

Germination of seed

Changing of milk into curd

Burning of match stick

Solution

Question 8

Compound

Molecule

Element

Mixture

Solution

Question 9

Rusting of iron

Ripening of fruit

A bud turning into flower

Boiling of water

Solution

Question 10

Molecules of the substance do not change

Molecules of a substance change

Change is reversible

Substance remain same

Solution

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