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Published on: 05/09/2019
Changes Around Us
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Questions + Answers key
Take MCQ Science Test
1.
Which is a way to make a change happen?
Heating of substance
Mixing of substance with another substance
Cooling of substance
All of the above
2.
Which one of the steps while burning a candle is not reversible?
Melting of solid wax
Wax vapour burn into flame
Liquid wax changes into vapours
All of the above
3.
Rolling of chapati and baking of chapati are the changes that
can be reversed
cannot be reversed
can be reversed and cannot be reversed respectively
cannot be reversed and can be reversed respectively
4.
Salt can be separated from its solution (salt dissolved in water) because
mixing of salt in water is a change that can be reversed by heating and melting of salt
mixing of salt in water is a change that cannot be reversed
mixing of salt-in water is a permanent change
mixing of salt in water is a change that can be reversed by evaporation
5.
Pick the change that can be reversed from the following.
Cutting of trees
Melting of ghee
Burning of candle
Blooming of flower
6.
Need heating
7.
Chemical change
8.
A new substance is formed
9.
Physical change
10.
No new substance is formed
11.
The boiling of rice is a physical change.
12.
Formation of curd from the milk is a physical change.
13.
Bursting of crackers are reversible change.
14.
Paper burning into ash is a irreversible change.
15.
When ice melts to form water, then a change occurs in its state.
16.
Change in weather takes place due to____________ of the sun.
17.
Heating and cooling any object is a ____________change
18.
Burning of paper is a ________change.
19.
Formation of curd from milk is a ________________change.
20.
Formation of rust on iron nail is a____________ change.
21.
When the ice melts? Is it reversible?
22.
Glowing of an electric bulb is a reversible change. Isn't it?
23.
An object expands on heating. Write one use of it
24.
Write the changes which cannot be reversed.
25.
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.
26.
Melting of wax can be reversed whereas burning of wax cannot be reversed. Explain.
27.
Tearing of paper is said to be a change that cannot be reversed. What about paper recycling?
28.
Can we reverse the following changes? If yes, suggest the name of the method.
(a) Water into water vapour
(b) Water vapour into water
(c) Ice into water
(d) Curd into milk
29.
It was Paheli's birthday, her brother Simba was helping her to decorate the house for the birthday party and their parents were also busy making other arrangements. Following were the activities going on at Paheli's home:
(a) Simba blew balloons and put them on the wall.
(b) Some of the balloons got burst.
(c) Paheli cut colourful strips of paper and put them on the wall with the help of tape.
(d) She also made some flowers by origami (paper folding) to decorate the house.
(e) Her father made dough balls.
(f) Mother rolled the dough balls to make puries.
(g) Mother heated oil in a pan.
(h) Father fried the puries in hot oil.
Identify the activities at Paheli's home, as those that can be reversed and those, which cannot be reversed.
30.
Conversion of ice into water and water into ice is an example of change which can be reversed. Give four more examples where you can say that the changes can be reversed.
1.
(d)
All of the above
2.
(b)
Wax vapour burn into flame
3.
(c)
can be reversed and cannot be reversed respectively
4.
(d)
mixing of salt in water is a change that can be reversed by evaporation
5.
(b)
Melting of ghee
6.
( )
Melting of ice cream
7.
( )
Ripening of mango(fruits)
8.
( )
Irreversible change
9.
( )
Sawing of piece of wood
10.
( )
Reversible change
11.
(b)
12.
(b)
13.
(b)
14.
(a)
15.
(a)
16.
( )
heat
17.
( )
reversible
18.
( )
chemical
19.
( )
chemical
20.
( )
chemical
21.
Ice melts when it is heated. Yes, it is reversible
22.
Yes, glowing of an electric bulb is a reversible change.
23.
The expansion of an object on heating is used for fixing of iron rim to the wooden wheel of a cart.
24.
The two changes which cannot be reverse are
(i) Change of milk into curd.
(ii) Rusting of iron
25.
Boojho will not be successful because making of toy from Plaster of Paris (POP) is a Change that cannot be reversed.
26.
Melting of wax is a reversible change because solid wax melts on heating and melted wax becomes solid on cooling. Melting of wax is a change which can be reversed, whereas burning of wax is an irreversible change we cannot combine all the products of burning of wax to get back the original candle. Therefore, burning of wax is a Change which cannot be reversed.
27.
We can get the paper on paper recycling but it is not the same original paper that we get. The colour and texture of the paper change.
28.
(a) Yes, the name of method is condensation.
(b) Yes, the name of method is evaporation.
(c) Yes, the name of method is freezing.
(d) Not possible.
29.
Reversed changes are as follows:
(a) Simba blew balloons and put them on the wall.
(d) Making of some flowers by origami (paper folding) to decorate the house.
(e) Her father made dough balls.
(f) Mother rolled the dough balls to make puries.
(g) Mother heated oil in a pan.
Changes that cannot be reversed are as follows:
(b) Some of the balloons got burst.
(c) Paheli cut colourful strips of paper and put them on the wall with the help of tape.
(h) Father fried the puries in hot oil
30.
Changes that can be reversed are called reversible changes.
Some examples are as follows:
(i) Melting of wax
(ii) Folding of a paper
(iii) Knitting of a sweater
(iv) Inflating of a tyre
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