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Practice each question, then open the answer or worked solution.
Question: 21
Are all wheels of a tractor or road roller of the same radius?
Answer: No, the wheels of a tractor or road roller do not have the same radius. Their back wheels are bigger.
Question: 22
Lali and Kali are tied to a pole with ropes. Kali has a longer rope. Who can look for more grass to eat?
Answer: Kali can look for more grass to eat as she has a longer rope.
NCERT book Page No: 88
Question: 23
Why did Naina get such a drawing? Discuss. Can a circle have more than 1 centimetre.
Answer: Yes, I got a circle.
Question: 24
Is this circle better than the one you made earlier without a compass? Draw the radius of this circle and measure it.
Answer: Yes, this circle is better than the earlier circle, which was drawn without using the compass. The radius of the circle is 3 centimetres.
NCERT book Page No: 89
Question: 25
Why did Naina get such a drawing? Discuss. Can a circle have more than one centre?
Answer: Naina got such a drawing, as she had changed the centre of the circle. No, a circle cannot have more than one centre.
Question: 26
Did any one of you ever get a shape like Naina’s?
Answer: Yes, I got the shape like Naina when I drew a circle using more than one centre.
NCERT book Page No: 91
Question: 27
Now you trace a circle on paper using a bangle. Cut it. Then find its centre like Sameena did.
Answer: Trace the circle by using a bangle in a notebook. Now, cut the circle from its outline. Fold the circle in half. Again fold it in half. Now, open the folded circle. Here, the crossing point of the two creased lines is its centre.
NCERT book Page No: 92
Balancing Act
Question: 28
Can you balance a plate on your finger?
Answer: No, I cannot balance a plate on my finger. It is very difficult, as it requires a lot of practice.
Question: 29
You also try to balance a plate or a round lid on your finger. Where does it balance?
Answer: The centre of a plate or a round lid is the place where we balance while trying on our fingers.
NCERT book Page No: 92-93
Now everybody was excited to spin their tops which looked like this.
Question: 30
(a) Whose top will not spin at all?
(b) Whose top will spin a little?
(c) Whose top will spin the best?
(d) In whose top is the stick nearest to the centre?
(a) Zakir’s and Naina’s tops will not spin at all.
(b) The top made by Guddo will spin a little.
(c) The top made by Appu will spin the best.
(d) The top in which the stick is nearest to the centre is Appu’s top.