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A student does the following :
Task 1: Takes a piece of wood and cut it into small various pieces.
Task 2: Takes a one glass of water and keep it into the freezer to freeze it.
Task 3: Takes one glass of water and little sugar. He dissolves the sugar into the water.
Task 4: Takes a piece of wood and burns it.
Which of the above mentioned tasks is / are the example(s) of physical change?

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Task 1, 2, 3 and 4

Task 1, 2 and 4

Task 1, 2 and 3

Task 4 only

answer is C.

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Detailed Solution

Task 1: Only size of wood reduces no new substance is formed.

Task 2: While we keep the water in a freezer temperature of liquid slows down.

$Liquid \to Solid$ .

It is a reversible change.

Task 3: While dissolving sugar in water no new substance are formed. All the above tasks are examples of physical change.

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