While lighting a candle, Paheli observed the following changes. Wax was melting Candle was burning Size of the candle was reducing Melted wax was getting solidified. of the above, the changes that can be reversed are

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While lighting a candle, Paheli observed the following changes. - Science

Question

While lighting a candle, Paheli observed the following changes.

Wax was melting
Candle was burning
Size of the candle was reducing
Melted wax was getting solidified. of the above, the changes that can be reversed are

Options

(i) and (ii)
(ii) and (iii)
(iii) and (iv)
(i) and (iv)

MCQ

Solution

(i) and (iv)

Explanation -

Molten wax solidifies and the solid wax can be again melted. Hence melting of wax and its solidification are reversible changes.

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Classification of Change: Reversible and Irreversible Changes

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Q 4.Q 3.Q 5.

Chapter 6: Changes Around Us - Multiple Choice Questions [Page 32]

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NCERT Exemplar Science [English] Class 6

Chapter 6 Changes Around Us
Multiple Choice Questions | Q 4. | Page 32

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Very Short Answer Type Question:
Some common changes are given in the below Table. Which of these changes do you think can be reversed?

Change	Can be reversed
(i) Raw egg to boiled egg	Yes/No
(ii) Batter to idli
(iii) Wet clothes to dirty clothes
(iv) Woollen yarn to knitted sweater
(v) Grain to its flour
(vi) Cold milk to hot milk
(vii) straight string to a cold string
(viii) Bud to flower
(ix) Milk to paneer
(x) Cow dung to biogas
(xi) stretched rubber band to its normal size
(xii) Melting of ice-cream

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Can we reverse the following change? If yes, suggest the name of the method.

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Give one example of change which occurs on heating but can be reversed.

Give one example of change which occurs on heating but cannot be reversed.

Give one example of change which occurs on cooling but can be reversed.

lt 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:

Simba blew balloons and put them on the wall.
Some of the balloons got burst.
Paheli cut colourful strips of paper and put them on the wall with the help of tape.
She also made some flowers by origami (paper folding) to decorate the house.
Her father made dough balls.
Mother rolled the dough balls to make puries.
Mother heated oil in a pan.
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.

Choose the odd one out. Give reason for your choice.