Physical and Chemical Changes Test

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Physical and Chemical Changes Test - 5

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Weekly Quiz Competition

Question 1
1 / -0

When water is boiled in a container, which of the following changes takes place?

A
Change in state

B
Change in colour

C
Change in taste

D
All the above
Question 2
1 / -0

By which of the following processes is salt obtained from seawater?

A
Evaporation

B
Crystallisation

C
Galvanization

D
Sedimentation
Question 3
1 / -0

Besides Zinc, which other metal is often deposited on iron to prevent its rusting?

a. Manganese
b. Chromium
c. Nickel
d. Copper

A
a only

B
a and b

C
a and c

D
b and c
Question 4
1 / -0

Which of the following may involve a physical change?

A
Change in shape only

B
Change in size only

C
Change in colour only

D
All the above
Question 5
1 / -0

LPG cylinders (used in kitchens) contain fuel in liquid state in the cylinder. It becomes gas when it comes out of the cylinder (Change A) and then burns (change B). Which of the following sentences is correct about changes A and B?

A
Both A and B are chemical changes.

B
Change A is a chemical change whereas change B is a physical change.

C
Change A is a physical change whereas change B is a chemical change.

D
Both A and B are physical changes
Question 6
1 / -0

Brown deposit of- is formed on iron blade when is reacted with iron.

Which of the following options best replaces a and b respectively?

A
Copper, Copper sulphate

B
Copper sulphate, copper

C
Copper, Iron sulphate

D
Iron sulphate, copper sulphate
Question 7
1 / -0

Which of the following metals is not mixed with iron and carbon during the formation of steel?

A
Chromium

B
Zinc

C
Copper

D
Nickel
Question 8
1 / -0

Burning of a ribbon of magnesium with a candle flame produces

A
brilliant white light

B
brilliant blue light

C
brilliant orange light

D
brilliant red light
Question 9
1 / -0

Khushi has two colourless solutions A and B and she wants to identify acid from base. She dips red litmus paper in both the solutions. Red litmus turns blue in solution A and remains wet in solution B. What are her interpretations?

A
A is an acid and B is a base

B
A is a base and B is an acid

C
Both A and B are acids

D
Both A and B are bases
Question 10
1 / -0

Under which of the following conditions would property of paper change?

A
When paper is burnt

B
When paper is cut

C
When paper is made wet

D
When paper is folded
Question 11
1 / -0

The physical change which occurs during burning of a candle is

A
production of light

B
flame production

C
melting of wax

D
production of heat
Question 12
1 / -0

Which of the following is an example of reversibility of state?

A
Rolling chalk dust into chalk

B
Cutting and joining of papers

C
Heating and cooling of hacksaw blade

D
Melting and freezing of water
Question 13
1 / -0

The ash formed on burning a ribbon of magnesium consists of

A
magnesium hydride

B
magnesium

C
magnesium hydroxide

D
magnesium oxide
Question 14
1 / -0

Which of the following is responsible for turning lime water milky when CO₂ is passed through it?

A
Carbon dioxide

B
Sodium hydrogen carbonate

C
Calcium hydroxide

D
Calcium carbonate
Question 15
1 / -0

Ozone breaks down ultraviolet radiations and protects us from its harmful effects. Into which form does it break the absorbed radiations?

A
O₃

B
Oxygen molecule (O₂)

C
Oxygen atom (O)

D
Carbon-dioxide

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Physical and Chemical Changes Test - 5

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Physical and Chemical Changes Test - 5

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SHARING IS CARING

Question 1

Change in state

Change in colour

Change in taste

All the above

Question 2

Evaporation

Crystallisation

Galvanization

Sedimentation

Question 3

a only

a and b

a and c

b and c

Question 4

Change in shape only

Change in size only

Change in colour only

All the above

Question 5

Both A and B are chemical changes.

Change A is a chemical change whereas change B is a physical change.

Change A is a physical change whereas change B is a chemical change.

Both A and B are physical changes

Question 6

Copper, Copper sulphate

Copper sulphate, copper

Copper, Iron sulphate

Iron sulphate, copper sulphate

Question 7

Chromium

Zinc

Copper

Nickel

Question 8

brilliant white light

brilliant blue light

brilliant orange light

brilliant red light

Question 9

A is an acid and B is a base

A is a base and B is an acid

Both A and B are acids

Both A and B are bases

Question 10

When paper is burnt

When paper is cut

When paper is made wet

When paper is folded

Question 11

production of light

flame production

melting of wax

production of heat

Question 12

Rolling chalk dust into chalk

Cutting and joining of papers

Heating and cooling of hacksaw blade

Melting and freezing of water

Question 13

magnesium hydride

magnesium

magnesium hydroxide

magnesium oxide

Question 14

Carbon dioxide

Sodium hydrogen carbonate

Calcium hydroxide

Calcium carbonate

Question 15

O3

O₃

Oxygen molecule (O₂)