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- 1. Multiple Choice
Pick the change that can be reversed from the following.
Cutting of trees
Melting of ghee
Burning of candle
Blooming of flower
- 2. Multiple Choice
Which of the following change cannot be reversed?
Hardening of cement
Freezing of ice cream
Opening a door
Melting of chocolate
- 3. Multiple Choice
An iron ring is heated. Which of the following statement about it is incorrect?
The ring changes its shape.
The ring almost comes to the same size on cooling.
The change, in this case, is reversed.
The ring expands and the change cannot be reversed.
- 4. Multiple Choice
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)
- 5. Multiple Choice
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 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.
- 6. Multiple Choice
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.
- 7. Multiple Choice
The iron 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
contracts and fits onto the wooden wheel
expands first, then on cooling contracts and fits onto the wooden wheel.
- 8. Multiple Choice
Which option correctly classifies the changes as reversible and irreversible?
- 9. Multiple Choice
A student learns that the bending of metallic wire is a reversible change. Why is it considered as a reversible change?
Because it can be changed back into its previous shape
Because the change caused to the metallic wire is permanent
Because the change in colour is always considered as a reversible change
Because metallic wire changes its material more easily
- 10. Multiple Choice
A girl is making chapati. She did the following steps:
Step 1: She added water, salt, and flour to make a dough.
Step 2: She used a rolling pin to shape the dough.
Which of these options correctly explains the changes?
Both the steps represent a reversible change
Both the steps represent an irreversible change
Step 1 is a reversible change and step 2 is an irreversible change
Step 2 is a reversible change and step 1 is an irreversible change
- 11. Multiple Choice
Which factor is responsible for the expansion and contraction of a metallic rod?
Change in shape
Change in weight
Change in type of material
change in temperature of the rod.
- 12. Multiple Choice
An ice cube melts into the water and the change is considered a reversible change.
Which factor would reverse the change?
a)Increase in weight of the water
b)Decrease in weight of the water
c)Increase in temperature of the water
d)Decrease in temperature of water
- 13. Multiple Choice
A student placed an iron nail outside in the rain and allowed it remains there for a few days. What will happen to the nail?
The nail gets rusted
The nail gets shrink
The nail remains the same
The nail gets broken into pieces
- 14. Multiple Choice
A student cuts a square piece of paper into 4 small square pieces as shown.
What makes this change irreversible change?
Addition of heat
Change in shape
Reduction of size
Difference in colour
- 15. Multiple Choice
Look at figure 6.1 which shows three situations
(a) a burning candle
(b) an extinguished candle
(c) melting wax.
Which of these shows a reversible change and why?
A
B
C
none of the above
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