Assignment for Changes Around Us 1questions and Answers Paper

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Question1

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 irreversible change

d) Bursting of cracker is fast change.

e) Formation of Petrol is a slow change

f) Baking of dough into bread is a irreversible change

Answer

a) True

b) True

c) False

d) True

e) True

f) False

Question 2

Fill in the Blank

1. Generally on heating metals---------------

2. Paper, petrol, LPG, CNG et. are-----------------substances

3. A change in which new substance if 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:

1) Expands

2) Inflammable

3) Chemical changes

4) Periodic changes

5) Pasteurization

6) Reversible change

7) Reversible change

8) Desirables changes

Question 3

Match the column

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:

Match the column
Column A	Column B
A change in which new substance is formed	Chemical changes
Changes in which Physical prospered 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 change
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

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