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Published on: 19/01/2019
Changes Around Us Revision Exam MCQs
Download CBSE Class 6th Standard CBSE Science question papers, sample papers, important questions, and previous year solved papers in PDF format. Get free study materials, NCERT solutions, and exam preparation resources for Class 6th Standard CBSE Science
Questions + Answers key
Take MCQ Science Test
1.
When a candle is lighted, which one of the following changes is not reversible?
Melting of solid wax
Wax vapour burns into flame
Liquid wax changes into vapours
All of the above
2.
A physical change is
Always reversible
Usually reversible
Always irreversible
None of these
3.
When a chocolate melts, it is:
a reversible change
an irreversible change
a physical change
both (a) and (c)
4.
Rusting of iron is an example of
Slow change
Fast change
Physical change
Reversible change
5.
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
6.
Breaking of toy is a
Reversible change
Periodic change
Irreversible
All of these
7.
What kind of change occurs in the eruption of a volcano
Physical change
Sudden change
Irreversible chang
All of these
8.
What kind of change is the rising of Sun?
Physical change
Reversible change
Periodic change
Sudden change
9.
Grinding of grain is
Physical change
Chemical change
Biological change
All of these
10.
Change that leads to the formation of a new substance is called
Chemical change
Physical change
Biological change
None of these
11.
Rolling of chapati and baking of chapati are the changes that:
Can be reversed
Can not be reversed
Can be reversed and can not be reversed respectively
Can not be reversed and can be reversed respectively.
12.
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 can not 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
13.
An iron ring is heated. Which of the following statements about it is incorrect?
The ring expands
The ring almost comes to the same size on cooling
The change in this case is reversed
The ring changes its shape and the change can not be reversed
14.
Which of the following changes can not be reversed?
Hardening of cement
Freezing of ice cream
Opening a door
Melting of chocolate
15.
Pick the change that can be reversed from the following:
Cutting of trees
Melting of ghee
Burning of candle
Blooming of flower
16.
Rusting of iron is an example of
slow change
fast change
physical change
reversible change
17.
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
18.
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
19.
Iran rim is made slightly smaller than the wooden wheel. The rim is usually heated before fixing into the wooden wheel because on heating the iron rim
expands and fits onto the wooden wheel
contracts and fits onto the wooden wheel
no change in the size takes place
expands first, then on cooling contracts and fits onto the wooden wheel
20.
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
21.
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
22.
While lighting a candle, Paheli observed the following changes.
(i) Wax was melting.
(ii) Candle was burning.
(iii) Size of the candle was reducing.
(iv) Melted wax was getting solidified.
Of the above, the changes that can be reversed are
(i) and (ii)
(ii) and (iii)
(iii) and (iv)
(i) and (iv)
23.
An iron ring is heated. Which of the following statements about it is incorrect?
The ring expands
The ring almost comes to the same size on cooling
The change in this case is reversed
The ring changes its shape and the change cannot be reversed
24.
Which of the following changes cannot be reversed?
Hardening of cement
Freezing of ice cream
Opening a door
Melting of chocolate
25.
Pick the change that can be reversed from the following.
Cutting of trees
Melting of ghee
Burning of candle
Blooming of flower
1.
(b)
Wax vapour burns into flame
2.
(b)
Usually reversible
3.
(d)
both (a) and (c)
4.
5.
(d)
All of the above
6.
(c)
Irreversible
7.
(d)
All of these
8.
(c)
Periodic change
9.
10.
11.
(c)
Can be reversed and can not be reversed respectively
12.
(d)
Mixing of salt in water is a change that can be reversed by evaporation
13.
(d)
The ring changes its shape and the change can not be reversed
14.
15.
(b)
Melting of ghee
16.
(a)
slow change
17.
(d)
All of the above
18.
(b)
Wax vapour burn into flame
19.
(d)
expands first, then on cooling contracts and fits onto the wooden wheel
20.
(c)
can be reversed and cannot be reversed respectively
21.
(d)
mixing of salt in water is a change that can be reversed by evaporation
22.
(d)
(i) and (iv)
23.
(d)
The ring changes its shape and the change cannot be reversed
24.
(a)
Hardening of cement
25.
(b)
Melting of ghee
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