NCERT Class VI Science Solutions: Chapter 6-Changes Around us Part 1

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Question 1:

To walk through a waterlogged area, you usually shorten the length of your dress by folding it. Can this change be reversed?

Answer:

Yes, by unfolding the dress this change can be reversed.

Question 2:

You accidentally dropped your favorite toy and broke it. This is a change you did not want. Can this change be reversed?

Answer:

No, it cannot be reversed, so it is an irreversible change.

Question 3:

Some changes are listed in the following table. For each change, write in the blank column, whether the change can be reversed or not.

Reversible and Non-Reversible Changes
Reversible and non-reversible changes

Sr.No

Change

Can be reversed (Yes/No)

1

The Sawing of a piece of wood

2

The melting of ice candy

3

Dissolving sugar in water

4

The cooking of food

5

The ripening of a mango

6

Souring of milk

Answer:

Reversible and Non-Reversible Changes (Ans)
Reversible and non-reversible changes (Ans)

Sr.No

Change

Can be reversed (Yes/No)

1

The Sawing of a piece of wood

NO

2

The melting of ice candy

Yes

3

Dissolving sugar in water

Yes

4

The cooking of food

No

5

The ripening of a mango

No

6

Souring of milk

No

Question 4:

A drawing sheet changes when you draw a picture on it. Can you reverse this change?

Answer:

It is all depends on situations:

By erasing the drawing we can undo the change. For example, if we draw with the help of pencil, we can erase the drawing by using an eraser. Then, it is a reversible change.

Image result for if we draw with the help of pencil, we can erase the drawing by using an eraser

Erase the Drawing by Using an Eraser

Image result for if we draw with the help of pencil, we can erase the drawing by using an eraser

If we draw using a pen, we cannot erase the drawing. Then this change cannot be reversed, so it is irreversible change.

As showing in images is a result for pan drawings

Result of the Pan Drawings

As showing in images is a result for pan drawings