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Published on: 28/08/2019
Changes Around Us
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Questions + Answers key
Take MCQ Science Test
1.
Salt can be separated from its solution (salt dissolved in water), because:
Mixing of salt in water is a change that can be reversed by heating and melting of salt
Mixing of salt in water is a change that can not be reversed
Mixing of salt in water is a permanent change
Mixing of salt in water is a change that can be reversed by evaporation
2.
An iron ring is heated. Which of the following statements about it is incorrect?
The ring expands
The ring almost comes to the same size on cooling
The change in this case is reversed
The ring changes its shape and the change can not be reversed
3.
Which of the following changes can not be reversed?
Hardening of cement
Freezing of ice cream
Opening a door
Melting of chocolate
4.
Pick the change that can be reversed from the following:
Cutting of trees
Melting of ghee
Burning of candle
Blooming of flower
5.
Which is a way to make a change happen?
Heating of substance
Mixing of substance with another substance
Cooling of substance
All of the above
6.
Which one of the steps while burning a candle is not reversible?
Melting of solid wax
Wax vapour burn into flame
Liquid wax changes into vapours
All of the above
7.
Salt can be separated from its solution (salt dissolved in water) because
mixing of salt in water is a change that can be reversed by heating and melting of salt
mixing of salt in water is a change that cannot be reversed
mixing of salt-in water is a permanent change
mixing of salt in water is a change that can be reversed by evaporation
8.
An iron ring is heated. Which of the following statements about it is incorrect?
The ring expands
The ring almost comes to the same size on cooling
The change in this case is reversed
The ring changes its shape and the change cannot be reversed
9.
Which of the following changes cannot be reversed?
Hardening of cement
Freezing of ice cream
Opening a door
Melting of chocolate
10.
Pick the change that can be reversed from the following.
Cutting of trees
Melting of ghee
Burning of candle
Blooming of flower
11.
Need heating
12.
Chemical change
13.
A new substance is formed
14.
Physical change
15.
No new substance is formed
16.
Salt can be obtained from sea water by the process of evaporation
17.
Souring of milk is a reversible change.
18.
A potato remains a potato even after it is cooked. Hence, cooking is a physical change.
19.
A balloon increases in size when filled with air.
20.
Reversible change is a permanent change.
21.
Freezing of water is an example of _______
22.
________ of iron is an irreversible change.
23.
In chemical change, constituents lead to the formation of new ____
24.
Growth of a plant is ___________change.
25.
Dry grass or scrap of paper burns____________ than a log of wood.
26.
Melting of wax is an irreversible change. Is it correct?
27.
How can you say that pickling of lemon is a desirable change?
28.
Name two changes in yourself that you face every day.
29.
Is boiling of an egg a physical or a chemical change?
30.
A cement bag left open gets hard after some time, what type of change it is ?
1.
(d)
Mixing of salt in water is a change that can be reversed by evaporation
2.
(d)
The ring changes its shape and the change can not be reversed
3.
4.
(b)
Melting of ghee
5.
(d)
All of the above
6.
(b)
Wax vapour burn into flame
7.
(d)
mixing of salt in water is a change that can be reversed by evaporation
8.
(d)
The ring changes its shape and the change cannot be reversed
9.
(a)
Hardening of cement
10.
(b)
Melting of ghee
11.
( )
Melting of ice cream
12.
( )
Ripening of mango(fruits)
13.
( )
Irreversible change
14.
( )
Sawing of piece of wood
15.
( )
Reversible change
16.
(a)
17.
(b)
18.
(b)
19.
(a)
20.
(b)
21.
( )
reversible change
22.
( )
Rusting
23.
( )
product
24.
( )
irreversible
25.
( )
faster
26.
( )
No, it is not correct because melting wax becomes solid again on cooling.
27.
( )
Pickle adds taste to our food. Hence, pickling of lemon is a desirable change.
28.
( )
(a) Daily hair growth.
(b) Daily nail growth
29.
( )
30.
( )
Chemical change.
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