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Changes around us

Total questions: 87

Worksheet time: 1hrs 27mins

Name
Class
Date
1.

In any reversible change

a)

final substance cannot be brought back to its original form

b)

final substance can be brought back to its original form

c)

new substance is formed

2.

Pick the reversible change

a)

Crushing paper

b)

Tearing a piece of cloth

c)

burning paper

3.

Pick the irreversible change

a)

Bursting balloons

b)

Melting ice

c)

Folding clothes

4.

Which one is true about physical changes?

a)

new substance is formed

b)

there is change in chemical composition

c)

no new substance is formed

5.

Pick the physical change

a)

burning paper

b)

bursting balloons

c)

frying potatoes

6.

Which of the following is true about chemical changes?

a)

No new substance is formed

b)

New substance is formed

c)

All chemical changes are reversible

7.

Which of them is not a chemical change?

a)

Baking cake

b)

Rusting of iron

c)

Cutting vegetables

8.
Which of these is NOT a reversible change?
a)
Water to Ice
b)
Juice to Popsicle
c)
Cookie Dough to Cookie
d)
Melting Chocolate
9.
Freezing juice is an example of a(n) ________
a)
physical change
b)
chemical change
10.

Identify the type of change shown here-

a)

PHYSICAL CHANGE

b)

NO CHANGE

c)

REVERSIBLE CHANGE

d)

IRREVERSIBLE CHANGE

11.

a)

PHYSICAL CHANGE

b)

IRRIVERSIBLE CHANGE

c)

NO CHANGE

d)

CHEMICAL CHANGE

12.

Is a burning candle a physical or chemical change?

a)

Physical

b)

Chemical

c)

BOTH

13.

Kajal left her hammer outside. When she found it a few months later, some parts of the metal were covered with flaky, brown rust. Which type of change occurred when rust formed on the hammer?

a)

chemical

b)

electrical

c)

thermal

d)

physical

14.

Grilling of food is a ________ type of change

a)

PHYSICAL CHANGE

b)

CHEMICAL CHANGE

c)

REVERSIBLE CHANGE

d)

NO CHANGE

15.

An irreversible change is one in which---------

a)

The original substances can be obtained

b)

The original substances can sometimes be obtained

c)

The original substance cannot be obtained

d)

No new substance is formed

16.
What happens in ALL chemical changes?
a)
Change in state of matter
b)
A new substance is formed
c)
Bubbles are produced
d)
An explosion
17.
Is burning wood a chemical or physical change?
a)
chemical
b)
physical
18.
Photosynthesis is an example of a
a)
physical change
b)
chemical change
19.

Setting of curd from milk is __________________ change

a)

slow, chemical and irreversible

b)

fast, physical and reversible

c)

slow, physical and reversible

d)

slow, physical and reversible

20.

A teacher wants to show clear difference between physical and chemical changes, which one of the following will be suitable for the same

a)

boiling of milk and freezing it

b)

setting curd and making paneer

c)

melting ice and freezing it

21.

Folding of paper is a ____________ change while burning it is a _____________ change.

a)

physical, physical

b)

fast, physical

c)

physical, chemical

22.

Spreading of Viral infections like COVID-19, is a ______________ change

a)

fast

b)

slow

c)

physical

d)

moderate

23.

A seed grows to form a seedling and further a plant, this is a ________________ change

a)

Fast

b)

Slow

c)

Temporary

d)

Reversible

24.

When cooked food is left outside at room temperature, it gets spoilt. This is an example of __________ change.

a)

Reversible

b)

Physical only

c)

Chemical only

d)

Irreversible

25.

A child was learning origami by folding paper, this involves __________ change

a)

Chemical

b)

Irreversible

c)

Physical

d)

No change

26.

Mrs. Aggarwal accidentally mixed oil in water while working in kitchen. Which method can be used to separate oil and water.

a)

Distillation

b)

Centrifugation

c)

Evaporation

d)

Separating funnel

27.

While making salt from sea water, _________ process is used. It involves _______ change.

a)

condensation, slow

b)

distillation, fast

c)

evaporation, reversible

d)

crystallisation, irreversible

28.

Which among the following is a physical change?

a)

cutting a log

b)

burning a wood

c)

ripening of fruit

d)

cooking of food

29.

Which of the following statements is true?

a)

Setting of milk to form curd is a chemical change and reversible change.

b)

Spoiling of food is a chemical and irreversible change.

c)

Burning of paper is a physical and reversible change.

d)

Boiling of an egg is a physical and reversible change.

30.

Study the venn diagram. What does centre point X represents?

a)

making paper boat

b)

Burning crackers

c)

Blowing a balloon

d)

rusting of a bicycle

31.

Which change represents point 1?

a)

Evaporation of water

b)

chopping of vegetables

c)

Burning of wood

d)

setting of milk

32.

Which change represents point 2?

a)

bursting of balloon

b)

condensation of water

c)

tearing a paper

d)

setting of Plaster of Paris

33.

Which change represents point 3?

a)

tearing of paper

b)

burning of LPG gas

c)

bursting of cracker

d)

melting of wax.

34.

Paheli’s mother made a concentrated sugar syrup by dissolving sugar in hot water. On cooling, crystals of sugar got separated. This indicates a –

a)

a physical change that can be reversed.

b)

the chemical change that can be reversed.

c)

a physical change that cannot be reversed.

d)

the chemical change that cannot be reversed.

35.

Which of the following statement is incorrect for a chemical reaction?

a)

Heat may be given out but never absorbed.

b)

The sound may be produced.

c)

A colour change may take place.

d)

A gas may be evolved.

36.

Iron pillar near the Qutub Minar in Delhi is famous for the following facts. Which of these facts is responsible for its long stability?

a)

It is more than 7 metres high.

b)

It weighs about 6000 kg.

c)

It was built more than 1600 years ago.

d)

It has not rusted after such a long period.

37.

Two drops of dilute sulphuric acid were added to 1 g of copper sulphate powder and a then a small amount of hot water was added to dissolve it (step I). On cooling, beautiful blue coloured crystals got separated (step II). Step I and Step II are:

a)

physical and chemical changes, respectively.

b)

chemical and physical changes, respectively.

c)

both physical change.

d)

both chemical change.

38.

Give an example of physical change

a)

kicking a football

b)

burning a paper

c)

growth of animals and plants

d)

cooking

39.

What is a reversible change?

a)

a change that cannot be reversed

b)

a change that can be reversed

c)

I don't know

d)

a change where a new substance is formed

40.

Melting of a popsicle is a reversible change

a)

true

b)

false

41.
Which of these is NOT a reversible change?
a)
Water to Ice
b)
Juice to Popsicle
c)
Cookie Dough to Cookie
d)
Melting Chocolate
42.
Changing liquid to a gas is called
a)
evaporation
b)
condensation
c)
melting
d)
freezing
43.
What is happening in the statement below?
The ice cube melted.
a)
Matter is changing from a liquid to a solid.
b)
Matter is changing from a liquid to a gas.
c)
Matter is changing from a solid to a liquid.
d)
Matter is changing from a gas to a liquid.
44.

The picture shows an example of a ______________ change.

a)

reversible

b)

freezing

c)

irreversible

d)

all of the above

45.
When heat is added to a solid, it ______________.
a)
freezes
b)
evaporates
c)
melts
d)
condenses
46.

One cup of water is left outside for two days when it was checked there was only half a cup left. What happened?

a)

sublimation

b)

condensation

c)

evaporation

d)

distillation

47.

Freezing juice is an example of a(n) ________

a)

irreversible change

b)

reversible change

48.
a)

Reversible Change

b)

Irreversible Change

c)

Both options are correct

d)

None of the above

49.

A teacher wants to show clear difference between reversible and irreversible changes, which one of the following will be suitable for the same

a)

boiling of milk and freezing it

b)

Boiling milk and making paneer

c)

melting ice and freezing it

50.

Folding of paper is a ____________ change while burning it is a _____________ change.

a)

reversible , reversible

b)

reversible, irreversible

c)

irreversible, reversible

51.

Which one of the following is a beneficial change?

a)

rusting of iron object

b)

spoilage of food

c)

ripening of fruit

d)

souring of milk

52.

The iron blade of a soil digging tool is fixed to a wooden handle by the process of ______________.

a)

melting

b)

contraction

c)

expansion

d)

freezing

53.

All changes takes place due to some______

a)

Cause

b)

Choice

54.

During condensation and evaporation of water, the ________ of water changes.

a)

Appearance

b)

State

c)

Movement

55.

The_______ balloon changes when we blow the air.

a)

Color

b)

Shape

56.

Rolling of chapathi and baking oh chapathi are the changes that,

a)

Can be reversed

b)

Cannot be reversed

c)

Can be reversed and cannot be reversed

d)

Cannot be reversed and can be reversed

57.

Increase in the volume of substances on heating,the substance will show the change in,

a)

Extension

b)

Expansion

c)

Exclusion

58.

Changes that lead to the formation of new substances are called_________.

a)

Physical change

b)

Chemical change

59.

Which of the following changes cannot be reversed?

a)

Milk to paneer

b)

Cold milk to hot milk

c)

Yarn to knitted sweater

d)

Wet clothes to dry clothes

60.

Which of the following can be reversed?

a)

Raw egg to boiled egg

b)

Wet clothes to dry clothes

c)

Bud of a flower

d)

Cow dung to bio-gas

61.

The process where the liquid changing into solid is called

a)

Evaporation

b)

Condensation

c)

Heating

d)

Boiling

62.

The burning of wood

a)

Can be reversed

b)

Cannot be reversed

c)

Can be expanded

d)

Can be melted

63.

Pick the change that can be reversed from the following

a)

Cutting of trees

b)

Melting of butter

c)

Burning of candle

d)

Blooming of flower

64.

What is a reversible change?

a)

a change that cannot be reversed

b)

a change that can be reversed

c)

I don't know

d)

a change where a new substance is formed

65.

The picture shows an example of a ______________ change.

a)

reversible

b)

freezing

c)

irreversible

d)

all of the above

66.

One cup of water is left outside for two days when it was checked there was only half a cup left. What happened?

a)

sublimation

b)

condensation

c)

evaporation

d)

distillation

67.

Folding of paper is a ____________ change while burning it is a _____________ change.

a)

reversible , reversible

b)

reversible, irreversible

c)

irreversible, reversible

68.

The iron blade of a soil digging tool is fixed to a wooden handle by the process of ______________.

a)

melting

b)

contraction

c)

expansion

d)

freezing

69.

Which one of the following is a beneficial change?

a)

rusting of iron object

b)

spoilage of food

c)

ripening of fruit

d)

souring of milk

70.

Which one of the following is a reversible change

a)

Tearing of paper

b)

Blowing air in a balloon

c)

Breaking of stick

d)

Baked chapati

71.

Classify the following as reversible or irreversible changes:

(i) Growth of a plant

(ii) Ploughing a field,

(ii) Melting of wax

(iv) Falling of rain

(v) Pulling of rubber string

(vi) Breaking of a glass rod

(mi) Cooking of food.

a)

Reversible : (ii), (iii), (v)

b)

Irreversible changes : (i), (iv), (vi), (ii)

c)

Reversible : (iii), (ii), (iv)

d)

Irreversible changes : (i), (v), (vi), (vii).

72.

On continuously heating water into a pan -

a)

The quantity of water in the pan decreases

b)

The quantity of water in the pan increases

c)

The quantity of water in the pan remains constant

d)

Can’t say anything in this case

73.

All changes takes place due to some______

a)

Cause

b)

Choice

74.

During condensation and evaporation of water, the ________ of water changes.

a)

Appearance

b)

State

c)

Movement

75.

The_______ balloon changes when we blow the air.

a)

Color

b)

Shape

76.

A chemical change is_______

a)

Permanent

b)

Temporary

c)

None of the avove

d)

Both of these

77.

Melting of ice is an example of_______

a)

Chemical change

b)

Physical change

78.

Rusting of iron is an ________ change.

a)

Physical change

b)

Chemical change

c)

Desirable change

d)

Reversible change

79.

Rolling of chapathi and baking oh chapathi are the changes that,

a)

Can be reversed

b)

Cannot be reversed

c)

Can be reversed and cannot be reversed

d)

Cannot be reversed and can be reversed

80.

Increase in the volume of substances on heating,the substance will show the change in,

a)

Extension

b)

Expansion

c)

Exclusion

81.

Changes that lead to the formation of new substances are called_________.

a)

Physical change

b)

Chemical change

82.

Which of the following changes cannot be reversed?

a)

Milk to paneer

b)

Cold milk to hot milk

c)

Yarn to knitted sweater

d)

Wet clothes to dry clothes

83.

Which of the following can be reversed?

a)

Raw egg to boiled egg

b)

Wet clothes to dry clothes

c)

Bud of a flower

d)

Cow dung to bio-gas

84.

The process where the liquid changing into solid is called

a)

Evaporation

b)

Condensation

c)

Heating

d)

Boiling

85.

A change which is permanent in nature....

a)

Irreversible

b)

Reversible

86.

A bag of cement lying in the open gets wet due to rain during night time. The next day sun shines brightly. Do you think the changes that have occured in the cement can be reversed?

a)

Yes

b)

No

87.

A change temporary in nature is,

a)

Reversible

b)

Irreversible

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