CBSE Class 8 Maths A Square and A Cube (Class 8 NCERT New) Quiz 3

1. What is the sum of first 6 odd numbers?

A 30 B 36 C 40 D 42

2. Given = 23104, what is the value of ? (Hint )

A 23104 + 153 B 23104 + 306 + 1 C 23104 + 305 D 23104 + 307 5 23104 + 150

3. A natural number is not a perfect square if it cannot be expressed as a sum of successive odd natural numbers starting from 1.

A True B False

4. The square roots of 64 are +8 and -8.

A True B False

5. Akhil cannot cut a handkerchief of side 15 cm from the given cloth because:

A the side of the original square cloth is less than 15 cm. B the cloth is not square in shape. C the cloth is too thick to cut. D the cloth is already cut into pieces.

6. Find the side length of the original square cloth.

A Side length = √125 ≈ 11.18 cm B Side length = √100 ≈ 10 cm C Side length = √144 ≈ 12 cm D Side length = √81 ≈ 9 cm

7. What is the largest possible square handkerchief (with integer side length) that Akhil can cut from the cloth?

A 11 cm. B 8 cm. C 9 cm. D 10 cm.

8. How much cloth area will remain unused after cutting the largest possible square handkerchief?

A Unused area = 125 - 121 = 4 cm^2 B Unused area = 125 - 100 = 25 cm^2 C Unused area = 125 - 81 = 44 cm^2 D Unused area = 125 - 64 = 61 cm^2

9. Perfect squares help in solving real-life problems by:

A determining the maximum possible size of square objects that can be cut from a given area, optimizing material usage. B finding the total number of objects in a group. C measuring the perimeter of circular objects. D calculating the volume of irregular shapes.

10. If a number contains 4 zeros at the end, how many zeros will its square have at the end?

A 8 zeros B 4 zeros C 2 zeros D 6 zeros