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Published on: 28/08/2019
Physical and Chemical Changes
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Questions + Answers key
Take MCQ Science Test
1.
Stretching of rubber band is not a physical change.
2.
Ships suffer a lot of damage though they are painted.
3.
Anaerobic bacteria digest animal wastes and produce biogas.
4.
When a candle burns, both physical and chemical changes take place.
5.
Condensation of steam is not a chemical change.
6.
Which one is a chemical change?
Burning of paper
Germination of seed
Formation of coal from wood
All of these
7.
What is the formula of rust?
Fe3O4
Fe2O3
FeO
None of these
8.
Galvanisation is a process used to prevent the rusting of which of the following?
Iron
Zinc
Aluminium
Copper
9.
A chemical change may involve
change in colour only
change in temperature only
evolution of gas only
All of the above
10.
Which of the following is a physical change?
Rusting of iron
Combustion of magnesium ribbon
Burning of candle
Melting of wax
11.
A reversible change is a__________ change
12.
Oxygen and _____________are must for rusting
13.
Iron benches kept in lawns and gardens get __________ It is a _______change because a new ________ is formed.
14.
Grinding of wheat grain changes its size. It is a __________ change
15.
A physical change is generally _________
16.
Chemical change
17.
Water to steam
18.
Lime stone
19.
Dissolving common salt in water
20.
Iron oxide
21.
Give two examples of physical change
22.
If you cut off a paper into various pieces, is there any change in the property of the paper?
23.
What are the two main kinds of changes?
24.
Did you recover chalk from the dust?
25.
Obviously, you cannot join the pieces back to make the original piece, but is there a change in the property of the paper?
1.
(b)
2.
(a)
3.
(a)
4.
(a)
5.
(a)
6.
(d)
All of these
7.
(b)
Fe2O3
8.
(a)
Iron
9.
(d)
All of the above
10.
(d)
Melting of wax
11.
( )
physical
12.
( )
water (Moisture)
13.
( )
rusted, chemical, substance
14.
( )
physical
15.
( )
reversible
16.
( )
Spoilage of food
17.
( )
Endothermic Change
18.
( )
CaCO3
19.
( )
Physical change
20.
( )
Rust
21.
( )
(i) Melting of ice (ii) Boiling of water
22.
( )
No, there is no change in the chemical property of paper.
23.
( )
There are two kinds of changes:
(i) Physical changes,
(ii) Chemical changes
24.
( )
No
25.
( )
No, no change takes place in the property of the paper
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CBSE 7th Standard CBSE Subjects
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