## Cubes and Cube Roots – Chapter 7/MCQ

**CBSE CLASS 8 MATHEMATICS**

**CUBES AND CUBE ROOTS – Chapter 7 /MCQ**

**Multiple Choice Questions**

**Choose the correct answers from the brackets:**

**1. Numbers obtained when a number is multiplied by itself three times are known as ——————**

A. Square numbers

B. Cube numbers

C. Perfect numbers

**2. If in the prime factorisation of any number each factor appears three times, then the number is a ————-**

A. Perfect cube

B. Perfect square

C. Perfect number

**3. Numbers like 1729, 4104, 13832 are known as ———– Numbers**

A. Hardy – Ramanujan

B. Archimedes

C. Eratosthenes

**4. Which of the following is not a perfect cube?**

A. 1000

B. 1728

C. 100

**5. There are ———- perfect cubes from 1 to 1000**.

A. 5

B. 10

C. 15

**6. Cube of any odd number is ———-**

A. Even

B. Odd

C. Prime

**7. The cube root of 8000 is ————–**

A. 20

B. 40

C. 80

**8. Which of the following is the cube of an even natural number?**

A. 2197

B. 4096

C. 6859

**9. The one’s digit of the cube of 21 is ————–**

A. 1

B. 2

C. 3

**10. The smallest natural number by which 392 must be multiplied so that the product is a perfect cube———**

A. 2

B. 3

C. 7

**11. Cube root of 64 is ———–**

A. 4

B. 8

C. 12

**12. By which smallest number should 53240 be divided so that the quotient is a perfect cube?**

A. 5

B.3

C.11

**13. Cube root of an even number is always an ——— number**

A. Odd

B. Even

C. Prime

**14. Figures which have 3- dimensions are known as ————**

A. Solid figures

B Geometric figures

C. Simple figures

**15. Each prime factor appears ————– times in its cubes.**

A. 1

B. 2

C. 3

**ANSWERS:**

1. Cube numbers

2. Perfect cube

3. Hardy- Ramanujan

4. 100

5. 10

6. Odd

7. 20

8. 4096

9. 1

10. 7

11. 4

12. 5

13. Even

14. Solid figures

15. 3

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