Changes around Us Test

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Changes around Us Test - 1

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Weekly Quiz Competition

Question 1
1 / -0

Which of these is the smallest particle?

A
A speck of dust

B
A water drop

C
A molecule

D
An atom

Solution

Explanation:

An atom is the smallest particle of an element which cannot be seen with naked eyes.
Question 2
1 / -0

Melting of ice is a

A
Both physical and chemical change

B
Chemical change

C
Periodic change

D
Physical change

Solution

Explanation:

Melting of ice into water is a physical change as no new substance is formed in it.
Question 3
1 / -0

In chemical changes

A
No change in colour

B
Rearrangement of molecules takes place

C
Rearrangement of atoms takes place

D
No change in arrangement of atoms

Solution

Explanation:

In a chemical change rearrangement of atoms takes place to form new substance with new properties which can not be reverted.
Question 4
1 / -0

In physical changes

A
Release of light energy takes place

B
Evolution of heat energy takes place

C
No new substance is formed

D
New substance is formed

Solution

Explanation:

In physical changes no new substance is formed but there are physical changes in it that can be returned back.
Question 5
1 / -0

Pulling of rubber band to increase its shape is a

A
Permanent change

B
Periodic change

C
Chemical change

D
Physical change

Solution

Explanation:

Pulling of rubber band to increase its shape is a physical change as it returns back to original position when force is removed.
Question 6
1 / -0

Growth of plant is a

A
Temporary change

B
Non-periodic change

C
Permanent change

D
Periodic change

Solution

Explanation:

Growth of plant is a permanent change and cannot be reversed back.
Question 7
1 / -0

In exothermic reaction

A
Heat is absorbed

B
All of these

C
Heat is evolved

D
No change in temperature

Solution

Explanation:

The chemical reaction in which heat is evolved is called as exothermic reaction.
Question 8
1 / -0

Sublimation is the changing of

A
Solid into liquid

B
Solids directly into gases

C
Gases into liquid

D
Liquid into gases

Solution

Explanation:

Sublimation is the changing of solids directly into gases without changing into liquids.
Question 9
1 / -0

Eruption of volcano is a

A
Temporary change

B
Undesirable change

C
Desirable change

D
Periodic change

Solution

Explanation:

Eruption of volcano is a undesirable change as volcano is not unpredictable and can emerge periodically or non periodically.
Question 10
1 / -0

Rotation of fan blade is a

A
Permanent change

B
Non- periodic change

C
Undesirable change

D
Periodic change

Solution

Explanation:

Rotation of fan blade is a periodic change as it is repeated at fixed interval of time.

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Changes around Us Test - 1

Result

Changes around Us Test - 1

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SHARING IS CARING

Question 1

A speck of dust

A water drop

A molecule

An atom

Solution

Question 2

Both physical and chemical change

Chemical change

Periodic change

Physical change

Solution

Question 3

No change in colour

Rearrangement of molecules takes place

Rearrangement of atoms takes place

No change in arrangement of atoms

Solution

Question 4

Release of light energy takes place

Evolution of heat energy takes place

No new substance is formed

New substance is formed

Solution

Question 5

Permanent change

Periodic change

Chemical change

Physical change

Solution

Question 6

Temporary change

Non-periodic change

Permanent change

Periodic change

Solution

Question 7

Heat is absorbed

All of these

Heat is evolved

No change in temperature

Solution

Question 8

Solid into liquid

Solids directly into gases

Gases into liquid

Liquid into gases

Solution

Question 9

Temporary change

Undesirable change

Desirable change

Periodic change

Solution

Question 10

Permanent change

Non- periodic change

Undesirable change

Periodic change

Solution

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