NCERT Solutions for Class 4th The World Around Us Chapter 7 Colouring the spinner — In-text Questions
Book page 109 Updated on2026-09-19
Q1.
What other changes can you make in your spinner? Can you colour it? How many different ways can you colour it?
Answer
Yes, you can colour it — and you can colour it in very many ways. The book shows four of them.
Four ways of colouring a round spinner, as shown in the book.
Other changes you can make:
Make the card bigger or smaller.
Use a longer or a shorter toothpick below the card.
Cut the card in a new shape.
Stick a small paper flag on the top.
Paint the spinner in a new pattern — rings, dots, stripes or slices.
Sample answer: I coloured one spinner with two colours turn by turn, one with four colours, one with all seven colours of a rainbow, and one with only dots. So there is no fixed number — you can colour a spinner in as many ways as you can think of.
Why it happens: Colour does not change how the spinner turns. It only changes what we see while it is turning.
Q2.
Colour the spinners in different ways, spin them and observe what happens. What happens to the colours on the spinner when it is painted with different colours and then spun?
Answer
The separate colours are no longer seen. They mix together and the spinner looks like one single colour.
Four ways of colouring a round spinner, as shown in the book.
Spinner
When it is still
When it is spinning fast
Purple and blue slices
Eight separate slices
One soft blue-purple colour all over
Yellow and red slices
Eight separate slices
One orange-ish colour all over
Many colours together
Eight different colours
One pale, dull colour, close to grey or white
Why it happens: The spinner turns so fast that our eyes cannot follow each colour one by one. We see all the colours together, so they look mixed into one.
Try this: Spin it slowly at first and then faster. The colours stay separate while it is slow and mix only when it turns fast.
Q3.
Many things around us spin, such as ceiling fans and potter’s wheels. What other things have you observed spinning?
Answer
Many things around us spin. Here are ones you can see every day.