Which of the following is a chemical change?
- AEvaporation of water
- ✓Burning of fuels
- CMoving of a wheel
- DBreaking of a brick
Answer: B.
View full solution →Question types
Changes Around Us question types
72 questions across 8 question groups — pick any mix to generate a Science paper with step-by-step answer keys.
72
Questions
8
Question groups
5
Question types
01
[1 Marks Each] M.C.Q.
10 Q→02[1 Marks Each] Blanks
12 Q→03True Or False.[1 Marks Each]
10 Q→04[1 Marks Each] QUE - ANS
19 Q→05Answer The Following Questions In Short.[2 Marks Each]
7 Q→06[3 Marks Each] QUE-ANS
9 Q→07Match The Following.[4 Marks Each]
1 Q→08[5 Marks Each] QUE-ANS
4 Q→Sample Questions
Changes Around Us questions
One sample from each question group in this chapter. Select any group above to see the full set with answer keys.
Which of the following is not a man$-$made change?
- ✓Change of day and night
- BBurning of fuels
- CDrying of clothes
- DTearing of paper
Answer: A.
View full solution →Conversion of a solid to liquid by heating is called
- Aevaporation
- ✓melting
- Ccondensation
- Dfreezing
Answer: B.
View full solution →Rusting of iron is an example of
- ✓slow change
- Bfast change
- Creversible change
- Dphysical change
Answer: A.
View full solution →Which is a way to make a change happen?
- AHeating a substance
- BCooling a substance
- CMixing a substance with another substance
- ✓All of these
Answer: D.
View full solution →With repeated use of an eraser, what changes do occur in it?
Out of heating of iron and rusting of iron which one is an irreversible change?
To fit a wooden handle in the iron ring of a tool to dig soil, the ring is heated. What will be the change in volume of the ring?
Out of cooling of milk and curdling of milk which one is a reversible change?
Is the burning of a matchstick a reversible or an irreversible change?
True or False: The burning of wood is an irreversible change.
True or False: The development of a seed into a sapling is a reversible change.
True or False: The knitting of a woolen sweater is a reversible change.
True or False: The developing of a bud into a flower is an irreversible change.
True or False: The boiling of an egg is a reversible change.
List four changes that take place in our body.
List four changes that takes place when an object is heated.
Give an example of a change that takes place when some other substance is mixed with the given substance.
Give an example of a reversible change that takes place when an object is heated.
Why is the curdling of milk known as an irreversible change?
Classify the following changes into reversible and irreversible:
Ripening of a mango, compressing a spring, burning of wood, souring of milk, melting of ice cream, blowing a balloon, glowing of a bulb, burning of coal, growing old, heating of tar, cooking dal from pigeon pea g rains dissolving alum in water.
How is curd prepared from milk?
State all the changes that occur in wheat starting from its grain to becoming a chapati. Also categorise them into reversible and irreversible changes.
How is a slightly smaller metal rim fitted on a wooden wheel of a bullock cart?
What do you mean by an irreversible change? Give two examples.
Look at which shows three situation:
Which of these shows a reversible change and why?
- A burning candle.
- An extinguished candle.
- Melting wax.
Which of these shows a reversible change and why?
Which of the following changes cannot be reversed?
- Blowing of a balloon.
- Folding a paper to make a toy aeroplane.
- Rolling a ball of dough to make roti.
- Baking cake in an oven.
- Drying a wet cloth.
- Making biogas from cow dung.
- Burning of a candle.
What are the differences between reversible changes and irreversible changes?
Boojho’s sister broke a white dove, a symbol of peace, made of Plaster of Paris $(POP)$. Boojho tried to reconstruct the toy by making a powder of the broken pieces and then making a paste by mixing water. Will he be successful in his effort? Justify your answer.
View full solution →A potter working on his wheel shaped a lump of clay into a pot. He then baked the pot in an oven. Do these two acts lead to the same kind of changes or different? Give your opinion and justify your answer.
Match the items given in Column $‘A’$ with those in Column $‘B’:$
View full solution →| $1$ | Wheat flour | $(a)$ Irreversible change |
| $2$ | Potter | $(b)$ Dough |
| $3$ | Rusting of iron | $(c)$ Reversible change |
| $4$ | Heating of iron | $(d)$ Potter wheel |
To show that the burning of a candle is an irreversible change.
To show that the process of rolling roti from wheat dough is a reversible change.
Show that making of a toy aeroplane by folding paper Is a reversible change.
Show that blowing of a balloon is a reversible change.
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