Assignment for Changes Around Us 1questions and Answers Paper (For CBSE, ICSE, IAS, NET, NRA 2022)
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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
| 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 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