28 June 2020

Cubes and Cube Roots – Chapter 7/MCQ

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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