2. State whether this change can be reversed or not.
(g) Burning of a candle.

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Solution

A change that can be reversed or can get back to its original state is called a reversible change.
During burning a candle, the thread of the candle burns.
The burnt thread cannot be obtained back.
Hence, this is an irreversible change and cannot be reversed.

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Question 4

While lighting a candle, Paheli observed the following changes:
(1) Wax was melting.
(2) Candle was burning.
(3) Size of the candle was reducing
(4) Melted wax was getting solidified.

Of the above, the changes that can be reversed are

Question 1

Pick the change that can be reversed from the following
(a) Cutting of trees
(b) Melting of ghee
(c) Burning of candle
(d) Blooming of flower

2. State whether this change can be reversed or not.

(d) Baking cake in an oven.

2. State whether this change can be reversed or not.

(f) Making biogas from cow dung.

2. State whether this change can be reversed or not.

(b) Folding a paper to make a toy aeroplane.

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2. State whether this change can be reversed or not.(g) Burning of a candle.

A change that can be reversed or can get back to its original state is called a reversible change.During burning a candle, the thread of the candle burns.The burnt thread cannot be obtained back.Hence, this is an irreversible change and cannot be reversed.

2. State whether this change can be reversed or not.
(g) Burning of a candle.

A change that can be reversed or can get back to its original state is called a reversible change.
During burning a candle, the thread of the candle burns.
The burnt thread cannot be obtained back.
Hence, this is an irreversible change and cannot be reversed.