Practice Worksheet for Class 6 Science Chapter 6 Changes Around Us -1
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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.
Answer
True
True
False
True
True
False
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 _________.
Answer
expands
Inflammable
Chemical changes
Periodic changes
pasteurization
Reversible change
Reversible change
Desirables changes
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
Answer
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
Question 4 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
Question 5 FILL IN THE BLANKS.
i. kneading of dough with flour is a __________ change.
ii. No new substance is formed in__________ change
iii. stretching of rubber band is __________ change.
iv. A/An __________ Change is a permanent change that cannot be undone.
v. The changes which are controlled by man are called __________
vi. conversion of a liquid to vapour by heating is called __________
vii. changes that occur after regular interval is called __________ .
viii. On heating, the metal rim of a wheel __________
Answer
i. physical
ii. physical
iii. reversible
iv. irreversible
v. man made
vi. evaporation
vii. periodic change
viii. expands
Question 6 TRUE OR FALSE
Ripening of mango is a reversible change.
Formation of curd is a chemical change.
Growth of animals is irreversible but for plants its reversible
Freezing of water is a temporary change.
Change of season is a natural change.
Melting of candle into wax is an irreversible change.
Burning of candle is chemical change.
Answer
i. false
ii. true
iii. false
iv. true
v. true
vi. false
vii. true
Question 7 MATCH THE COLUMN
Answer
a-iii
b-i
c-iv
d-ii
Question 8 CHOOSE THE ODD ONE OUT
i. curding of milk, 20th may 2010, freezing of water, digestion of food.
ii. melting of butter, burning of paper, boiling of water, cutting of aluminium foil in half.
iii. change of day and night, dissolving salt in water in lab, change of season, dissolved salt in sea water.
iv. cooking of food, rusting of iron, crushing of can, addition vinegar to baking soda.
Answer
i. freezing of water (all others are irreversible)
ii. burning of paper (all others are physical change)
iii. dissolving salt in water in lab (all others are natural changes)
iv. crushing of can (all others are chemical change)
