Question

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 numbe
. Cube root of 125000 is ———–
A. 40
B. 55
C. 50

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​

Answer 1

Answer:

1. cube number

2. perfect square

3. 40

4.1728

5.10

6. prime

7.20

8.6859

9. 2

10. 7

Answer 2

Answer:

(1) B. Cube numbers

(2) A. Perfect Cube

(3) C. 50

(4) C. 100

(5) C. 15

(6) B. Odd

(7) A. 20

(8) B. 4096

(9) A. 1

(10) B. 3