Changes around Us Test

Result

Changes around Us Test - 4

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Weekly Quiz Competition

Question 1
1 / -0

Which of the following changes are irreversible?

A
Milk to paneer

B
Cow dung to biogas

C
Grain to its flour

D
All of the above

Solution

The changes which can be brought back to their original form are known as reversible changes whereas the changes which cannot be brought back to their original form are called irreversible changes.

All of the following changes are irreversible because we can not convert them to their original form.
1) Milk to paneer
2) Cow dung to biogas
3) Grain to its flour
Question 2
1 / -0

Which of the following is true?

A
Melting of ice is reversible change.

B
Burning of magnesium is reversible change.

C
Rusting of iron is reversible change.

D
All of the above.

Solution

Melting of ice is a reversible change as water formed can be frozen back to ice.

The burning of magnesium and rusting of iron are irreversible changes and cannot be reversed.

Hence, option A is true.
Question 3
1 / -0

Which of the following is not a reversible change ?

A
Heating of water to steam

B
Cooking of eggs to scrambled eggs

C
Heating of wax to molten wax

D
All of these are reversible changes

Solution

$$(a)$$ When water is heated to form steam, it can be reversed back on cooling. Hence it is a reversible change.

$$(b)$$ When the egg is cooked, the egg changes from liquid to solid and there is no way to reverse the change and get back to the original form. Therefore it is not a reversible change.

$$(c)$$ Molten wax can be cooled to get solid wax. Hence it's a reversible change.

Option (B) is the correct answer.
Question 4
1 / -0

Making a ring from gold is a/an _____ change and making a statue from wood is a/an _____change.

A
irreversible, reversible

B
reversible, irreversible

C
irreversible, irreversible

D
reversible, reversible

Solution

Making a ring from gold is a reversible change because it can be melt again and making a statue from wood is an irreversible change.

Hence, the correct option is $$B$$.
Question 5
1 / -0

Which of the following statements is correct?

A
Physical changes are always irreversible

B
All chemical changes are reversible

C
New substances are formed during a physical change

D
A chemical change produces a new substance

Solution

Chemical change always produces a new substance but physical change does not produce any new substance. Although some chemical and physical changes are irreversible but not all.
For example:
(i) Breaking glass is an irreversible physical change.
(ii) Cooking food is an irreversible change.

Hence, the correct option is $$(D)$$
Question 6
1 / -0

Which of the following is not a reversible change?

A
Heating of water to steam

B
Cooking of egg to scrambled eggs

C
Heating of wax to molten wax

D
Cooling a cake

Solution

In cooking chemical change occur, hence it is an irreversible change. In this cooking of egg to scrambled egg is an irreversible change.
Question 7
1 / -0

Our growth is a/an :

A
Physical change

B
Chemical decomposition reaction

C
Irreversible change

D
Fast reaction

Solution

Our growth is an irreversible change or reaction, once grown in height or age can not be gained back.
Question 8
1 / -0

Dissolving sugar in water is a:

A
combination reaction

B
reversible change

C
decomposition reaction

D
periodic change

Solution

Dissolving sugar in water is a reversible change. Sugar-water solution can be separated by the method of evaporation where water evaporates leaving sugar behind.
Question 9
1 / -0

The germination of a seed is:

A
a physical, reversible change in which energy is produced

B
a fast, chemical reaction in which energy is released

C
a slow, irreversible, desirable, chemical change

D
a fast, irreversible, undesirable, chemical change

Solution

The germination of a seed is a slow and irreversible process as it takes few days to months to germinate a seedling from a seed, and this is irreversible because the same seedling which grows into a plant cannot revert back in its growth.

The growth of seedlings in a crop is a desirable change i.e the changes which are beneficial to nature or which do not cause any harm to nature.
Question 10
1 / -0

Choose the incorrect statement(s).

A
Chemical reactions are characterized by the change in colour.

B
Chemical reactions are not alone characterized by change in state.

C
Physical changes are characterized by the change in colour of reacting substances.

D
Physical changes are not reversible.

Solution

Physical changes are reversible which involves a change in the state of matter from solid to liquid or liquid to solid or solid to gases which are called vaporization, freezing, condensation, etc.
Hence, option D is correct.

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Re-Attempt Weekly Quiz Competition

Changes around Us Test - 4

Result

Changes around Us Test - 4

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SHARING IS CARING

Question 1

Milk to paneer

Cow dung to biogas

Grain to its flour

All of the above

Solution

Question 2

Melting of ice is reversible change.

Burning of magnesium is reversible change.

Rusting of iron is reversible change.

All of the above.

Solution

Question 3

Heating of water to steam

Cooking of eggs to scrambled eggs

Heating of wax to molten wax

All of these are reversible changes

Solution

Question 4

irreversible, reversible

reversible, irreversible

irreversible, irreversible

reversible, reversible

Solution

Question 5

Physical changes are always irreversible

All chemical changes are reversible

New substances are formed during a physical change

A chemical change produces a new substance

Solution

Question 6

Heating of water to steam

Cooking of egg to scrambled eggs

Heating of wax to molten wax

Cooling a cake

Solution

Question 7

Physical change

Chemical decomposition reaction

Irreversible change

Fast reaction

Solution

Question 8

combination reaction

reversible change

decomposition reaction

periodic change

Solution

Question 9

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

Solution

Question 10

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.

Solution

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