NCERT Solutions for Class 4 Maths - Chapter 8 - Carts And Wheels

Page No 82:

Ques 1: A bangle can be used to trace a circle. What are the other things around you that you can use to trace a circle? ________ _________ _________ _________ ________ _________ _________ _________
Ans: Other things that can be used to trace a circle are coin, bottle cap, pen cap, plate, etc.

Ques 2: Trace a circle with the help of some of these in your notebook or on the ground. Which thing makes the smallest circle? Which thing makes the biggest circle?
Ans: The smallest circle can be made with the help of a pen cap. The biggest circle can be made with the help of a round plate in which we eat.

Page No 83:

Ques 1: Think of some other games you play by making circles.
Ans: Dog in the bone and truth and dare are two games that we play by making circles.

Page No 84:

Ques 1:

Is any of these a good drawing of a circle? Discuss.
• Can you draw a circle on the floor with a chalk? Try.
• Also draw a circle in your notebook using a pencil.
• Look at the circles drawn by your friends. Who has drawn the best circle?
Ans:

• Yes, the circle drawn by Chippu is good.
• Yes, we can draw a circle on the floor with a chalk.

Page No 86:

Ques 1: Draw the radius of this bangle using a ruler. Measure the length of the radius.

Ans: The radius of the bangle is 2 cm.

Ques 2: Draw the radius of these circles. Guess which circle has the longer radius. 

Measure the radius of both the circles using a ruler. Write the length of their radius. 
• Radius of the green circle __________ 
• Radius of the blue circle __________
Ans: 

The blue circle has a larger radius as compared to the green circle.
• Radius of the green circle 1 cm
• Radius of the blue circle 1.5 cm

Ques 3: Find out 
• Measure the radius of the wheels of a bicycle or a bullock-cart. You can use a thread or a measuring tape. Are all the wheels of a bicycle or a bullock cart of the same radius? _________ 
• Have you seen a tractor or a road roller? 
• Which is the biggest wheel you have ever seen? 
• Are all wheels of a tractor or road roller of the same radius? • Lali and Kali are tied to a pole with ropes. Kali has a longer rope. Who can look for more grass to eat? _________
Ans: 

• All the wheels of a bicycle or a bullock cart are not of the same radius. They have different radius depending upon the size of the bicycle or the bullock cart.
• Kali will get more grass to eat as Kali is tied to a longer rope.

Page No 89:

Ques 1:

Guess 
• Why did Naina get such a drawing? Discuss. 
• Can a circle have more than one centre?
Ans: 
• Naina got such a drawing because she had changed the centre of the circle.
• No, a circle cannot have more than one centre.

Page No 91:

Ques 1: We can also make the design on page 88 like this. How did you do it?

Ans: 

Page No 93:

Ques 1:

Guess
• Whose top will not spin at all? ________
• Whose top will spin a little? ________
• Whose top will spin the best? _______
• In whose top is the stick nearest to the centre? ________
Ans:

• Zakir’s and Naina’s tops will not spin at all.
• Guddo’s top will spin a little.
• Appu’s top will spin the best.
• In Appu’s top, the stick is nearest to the centre.

Ques 2: To make the top spin well, where will you make the hole?
Ans: To make the top spin well, we will make the hole in its centre.