NCERT Class 4 Maths Chapter-8 Carts And Wheels

NCERT Solutions for Class 4 Maths Chapter-8

NCERT textbook consists of Chapter 8 Carts And Wheels which consists of lots of questions in exercise as well as inside the textbook, our experts solved all the questions asked in Carts And Wheels as per the CBSE guideline.

What are you going to learn in Chapter 8 Carts And Wheels?

Chapter 8 Carts And Wheels focus on the circle and what is the use of the circle? This chapter gives you an idea and use of carts and wheels and how to make the right dimension of carts and wheels and what are the use of a circle and its dimension while making the cart and wheels. You will know about the difference between radius and diameter. How to draw the right set of circles and what is the use of radius. You will find the answer to the following question

Do the activity in small groups. Each group should take a rope of a different length. See the circles made by different groups.

How long was their rope?

Does longer make a bigger circle?

Why is it so?

Download step by step explanation of NCERT Solutions for Chapter 8 Carts And Wheels

1. Take a wire and make a bangle for yourself. Can your teacher wear this bangle?

Ans: No, my teacher cannot wear my bangle because my bangle is too small for her hand.

2. 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: The other things around me that can be used to trace a circle are finger ring, bowl, glass, coin, etc.

3. 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: Finger ring makes the smallest circle and a plate makes the biggest circle.

4. Think of some other games you play by making circles.

Ans: Games like ringa-ringa roses, etc are played by making a circle.

5. (a) Is any of these a good drawing of a circle? Discuss.

Ans: Yes, the circle drawn is good.

(b) Can you draw a circle on the floor with a chalk? Try.

Ans: Yes, a circle on the floor can be drawn with the help of chalk.

(c) Also draw a circle in your notebook using a pencil.

Ans: The circle is drawn as follows.

(d) Look at the circles drawn by your friends. Who has drawn the best circle?

Ans: All circles are best.

6. Do the activity in small groups. Each group should take a rope of a different length. See the circles made by different groups.

(a) Which group made the smallest circle?________How long was their rope?______

Ans: My group made the biggest circle. The length of the rope was 44 cm.

(b) Does a longer rope make a bigger circle?____________Can you say why?

Ans: Yes, a longer rope makes a bigger circle because longer the rope longer the radius hence bigger the circle.

7. The length of rope used is equal to the length of the radius of the circle.

What was the radius of the smallest circle?__________

Ans: For example: the radius of the circle is 4 cm.

8. Draw the radius of this bangle using a ruler. Measure the length of the radius.

Ans: The radius of the bangle using the ruler is 2 cm.

9. 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.

(a) Radius of the green circle_________

Ans: The radius of the green circle 1 cm.

(b) Radius of the blue circle _______

Ans: Radius of the blue circle 1.5 cm.

The radius of blue circle is longer than the green circle since 1.5 >1

10. Find out:

(a) 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?__________

Ans: No the radius of the wheels of a bicycle or a bullock cart are not of the same radius. It is because the size of the wheels varies from vehicle to vehicle.

(b) Have you seen a tractor or a road roller?

Ans: Yes, I have seen a tractor or a road roller.

(c) Which is the biggest wheel you have ever seen? Are all wheels of a tractor or road roller of the same radius?

Ans: The biggest radius I have seen is of road roller. No they all have different radius.

(d) Lali and Kali are tied to a pole with ropes. Kali has a longer rope. Who can look for more grass to eat?_________

Ans: Kali can look for more grass to eat as she is tied to a longer rope as compared to Lali.

11. Is this circle better than the one you made earlier without a compass? Draw the radius of this circle and measure it. • Now you can make your own designs like Dal jeet had made. How many did you make? Guess how this design has been made. Use a compass to make a similar one in the box.

Ans: The given designs are made by compass.

12. Guess the following:

(a) Why did Naina get such a drawing? Discuss.

Ans: Naina got such a drawing because she did not keep the centre at the same point while drawing.

(b) Can a circle have more than one centre?

Ans: No, a circle has only one centre.

13: Guess the following.

(a) Did anyone of you ever get a shape like Naina’s?

Ans: Yes, have got a shape like Naina’s.

14. Now you trace a circle on a paper using a bangle. Cut it. Then find its centre like Sameena did.

Ans: Draw a circle using a bangle.

Now fold the circle into half then again fold in half and the intersection of two lines is the centre of circle.

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

Ans: Draw a line then draw two smaller circles inside the bigger circle adjacent to each other.

Now remove the upper half of the first circle and the lower half of the second circle.

Hence, the resulting figure is as follows.

16. Guess the following.

Zakir Appu Naina Guddo

(a) Whose top will not spin at all?_______

Ans: Zakir’s and Naina’s tops will not spin at all because the stick is near the edge of the top.

(b) Whose top will spin a little?_______

Ans: Guddo’s top will spin a little because the stick is somewhere in between the centre and edge.

(c) Whose top will spin the best?________

Ans: Appu’s top will spin the best because the stick is right in the centre of the top.

(d) In whose top is the stick nearest to the centre?________

Ans: The stick is nearest to the centre of Appu’s top.

17. To make the top spin well, where will you make the hole?

Ans: We will make the hole in its centre so that the top spins well.