Practice Worksheet for Class 6 Science Chapter 6 Changes Around Us -1

Question 1
State True or False
(a) Evaporation of water is a reversible change.
(b) Burning of the candle is an irreversible change.
(c) Rusting of iron is a reversible change.
(d) Bursting of cracker is fast change.
(e) Formation of Petrol is a slow change.
(f) Baking of dough into bread is a reversible change.
Question 2
Fill in the Blank
1. Generally on heating metals ______ .
2. Paper, petrol, LPG, CNG etc. are _________ substances.
3. A change in which new substance is formed is called __________.
4. A change that occurs during a definite time interval is known as _________.
5. ______ is the process Heating of milk for boiling to kill microbes.
6. Dissolving sugar in water is a ____________.
7. water changes into ice on cooling is an example of _______.
8. Those changes which are desired to occur that is we want them to take place are known _________.
Question 3
Match the column

Column A	Column B
A change in which new substance is formed	Non-periodic change
Changes in which physical properties like shape, size and state changes without formation of new substance	Slow change
Those changes which take place in a long period of time	Undesirable changes
Those changes which we do not want to take place	Chemical changes
A change that does not repeat again and again after a regular interval of time	Physical changes
Burning of fuel is a	Irreversible change

Crossword
Solve the below crossword

Across
6. Changing of water vapour into water
7. Changing of water into gas on heating
Down
1. The burning of fuel on heating
2. Changing of ice into water on heating
3. drying of clothes is a
4. change of substance from liquid to solid state
5. Bursting of balloon is
6. cooking of food is a


Answer 1

1. True
2. True
3. False
4. True
5. True
6. False

Answer 2

1. expands
2. Inflammable
3. Chemical changes
4. Periodic changes
5. pasteurization
6. Reversible change
7. Reversible change
8. Desirables changes

Answer 3

Column A	Column B
A change in which new substance is formed	Chemical changes
Changes in which physical properties like shape, size and state changes without formation of new substance	Physical changes
Those changes which take place in a long period of time	Slow changes
Those changes which we do not want to take place	Undesirable changes
A change that does not repeat again and again after a regular interval of time	Non-periodic change
Burning of fuel is a	Irreversible change

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