MCQ Questions for Class 8 Maths Chapter 7 Cubes and Cube Roots with Answers

Free PDF Download of CBSE Maths Multiple Choice Questions for Class8 with Answers Chapter 7 Cubes and Cube Roots. Maths MCQs for Class 8 Chapter Wise with Answers PDF Download was Prepared Based on Latest Exam Pattern. Students can solve NCERT Class 8 Maths Cubes and Cube Roots MCQs Pdf with Answers to know their preparation level.

Cubes and Cube Roots Class 8 Maths MCQs Pdf

1. The one’s digit of the cube of 53 is:
a) 9
b) 3
c) 7
d) 1

Answer/Explanation

Answer: (c)
Explanation: 533 = 53 x 53 x 53

33 = 3x3x3 = 27

Hence, at unit place we will get 7.

Recheck: 533 = 53 x 53 x 53 = 148877


2. The prime factorisation of 64 is:
a) 2 x 2 x 2
b) 4 x 4 x 4
c) 8 x 8 x 8
d) None of the above

Answer/Explanation

Answer: (b)
Explanation: 64 = 43 = 4 x 4 x 4


3. Which of the following is not a perfect cube?
a) 216
b) 1000
c) 243
d) 1331

Answer/Explanation

Answer: (c)
Explanation: 243 = 3 × 3 × 3 × 3 × 3 = 33 × 32


4. By what number should 81 be divided to get a perfect cube?
a) 3
b) 6
c) 7
d) 9

Answer/Explanation

Answer: (a)
Explanation: The prime factorisation of 81 will be:

81 = 3 × 3 × 3 × 3

81 = 33 × 3

Hence, we need to divide 81 by 3 to get:

81/3 = 27 = 33


5. By what number should we divide 135 to get a perfect cube?
a) 3
b) 5
c) 7
d) 9

Answer/Explanation

Answer: (b)
Explanation: 135 = 3 x 3 x 3 x 5

We can see, 5 is the extra number which cannot be paired in a group of 3.

Hence, 135/5 = 27


6. Cube root of 512 is:
a) 4
b) 6
c) 8
d) 12

Answer/Explanation

Answer: (c)
Explanation: By prime factorisation we get:

512 = 2 × 2 × 2 × 2 × 2 × 2 × 2 × 2 × 2

3√512 = 2 × 2 × 2 = 8


7. What should be divided by 53240 to make it a perfect cube?
a) 5
b) 10
c) 15
d) 20

Answer/Explanation

Answer: (a)
Explanation: The prime factorisation of 53240

53240 = 2 × 2 × 2 × 11 × 11 × 11 × 5 = 23 × 113 × 5

Hence, we need to divide 53240 by 5

53240/5 = 10648 is a perfect cube.


8. The value of 43√1000 is:
a) 400
b) 40
c) 10
d) 4

Answer/Explanation

Answer: (b)
Explanation: 43√1000 = 43√(10×10×10) = 4 × 10 = 40


9. A perfect cube does not end with _____ zeros.
a) 1
b) 2
c) 3
d) 4

Answer/Explanation

Answer: (b)
Examples: 103 = 1000

203 = 8000

303 = 27000


10. Cube root of 15625 is:
a) 5
b) 15
c) 25
d) 35

Answer/Explanation

Answer: (c)
Explanation: 15625 = 5 x 5 x 5 x 5 x 5 x 5

3√15625 = 5 × 5 = 25


11. Which of the following is not a perfect cube?
(a) 1
(b) 9
(c) 8
(d) 27

Answer

Answer: (b)


12. The cube of 4 is _______________ .
(a) 12
(b) 8
(c) 4
(d) 64

Answer

Answer: (d)


13. The value of 5³ is __________ .
(a) 125
(b) 15
(c) 10
(d) 75

Answer

Answer: (d)


14. The cube of an even number is always ____________ .
(a) odd number
(b) even number
(c) prime number
(d) none of these

Answer

Answer: (b)


15. The cube of an odd number is always __________ .
(a) odd number
(b) even number
(c) prime number
(d) none of these

Answer

Answer: (a)


16. Each prime factor appears _________ times in its cube?
(a) 2
(b) 3
(c) 1
(d) 4

Answer

Answer: (b)


17. Which of the following is Hardy-Ramanujan Number?
(a) 1724
(b)1725
(c) 1727
(d) 1729

Answer

Answer: (d)


18. By which smallest natural number 392 must be multiplied so as to make the product a perfect cube?
(a) 2
(b) 14
(c) 7
(d) 49

Answer

Answer: (c)


19. The smallest natural number by which 243 must be multiplied to make the product a perfect cube is __________ .
(a) 3
(b) 9
(c) 8
(d) 7

Answer

Answer: (a)


20. The smallest natural number by which 704 must be divided to obtain a perfect cube is
(a) 22
(b) 12
(c) 11
(d) 13

Answer

Answer: (c)


21. The smallest natural number by which 135 must be divided to obtain a perfect cube is
(a) 5
(b) 3
(c) 15
(d) 9

Answer

Answer: (a)


22. Which of the following is not a perfect cube?
(a) 216
(b) 343
(c) 125
(d) 108

Answer

Answer: (d)


23. The expansion of a³ is ___________ .
(a) 3 × a
(b) a+a+a
(c) 3 × 3 × 3
(d) a × a × a

Answer

Answer: (d)


24. What will be the unit digit of the cube of a number ending with 2?
(a) 8
(b) 4
(c) 2
(d) 6

Answer

Answer: (a)


25. What will be the unit digit of the cube of a number ending with 4?
(a) 4
(b) 6
(c) 2
(d) 8

Answer

Answer: (a)


26. What will be the unit digit of the cube of a number ending with 6?
(a) 4
(b) 6
(c) 2
(d) 8

Answer

Answer: (b)


27. A cuboid has dimensions 5cm , 2cm, 5cm .How many such cuboid will be needed to form a cube?
(a) 20
(b) 10
(c) 5
(d) 2

Answer

Answer: (a)


28. How many cuboids of dimensions 15cm, 30cm ,15cm will be needed to form a cube?
(a) 15
(b) 4
(c) 30
(d) 5

Answer

Answer: (b)


29. 729 is the value of _______________ .
(a) 8³
(b) 9³
(c) 6³
(d) 4³

Answer

Answer: (b)


30. Which of the following is a perfect cube?
(a) 125
(b) 135
(c) 145
(d) 115

Answer

Answer: (a)


31. What is the volume of a cube whose edge is 2cm?
(a) 8
(b) 6
(c) 10
(d) 4

Answer

Answer: (a)


32. The symbol for cube root is __________ .
MCQ Questions for Class 8 Maths Chapter 7 Cubes and Cube Roots with Answers

Answer

Answer: (b)


33. The cube root of 512 is ________ .
(a) 8
(b) 32
(c) 16
(d) 2

Answer

Answer: (a)


34. The value of \(\sqrt[3]{343}\) is ____ .
(a) 8
(b) 7
(c) 6
(d) 3

Answer

Answer: (b)


35. Which of the following is true for any natural number n?
(a) n²>n³
(b) n³>n²
(c) n²=n³
(d) none of these

Answer

Answer: (b)


36. If the volume of a cube is 125 cm3 then what would be the length of its side?
(a) 25
(b) 5
(c) 4
(d) 15

Answer

Answer: (b)


37. What will be the unit digit of the cube root of a number ends with 8?
(a) 2
(b) 8
(c) 4
(d) 6

Answer

Answer: (a)


38. What will be the unit digit of the cube root of a number ends with 2?
(a) 2
(b) 8
(c) 4
(d) 6

Answer

Answer: (b)


39. What will be the unit digit of the cube root of a number ends with 3?
(a) 3
(b) 7
(c) 5
(d) 2

Answer

Answer: (b)


40. What will be the unit digit of the cube root of a number ends with 7?
(a) 3
(b) 7
(c) 6
(d) 5

Answer

Answer: (a)


41. 9 is the cube root of __________ .
(a) 343
(b) 729
(c) 629
(d) 81

Answer

Answer: (b)


42. The number of digits in the cube root of a 6-digit number is _______ .
(a) 3
(b) 2
(c) 4
(d) 6

Answer

Answer: (b)


43. How many digits will be there in the cube root of 46656?
(a) 2
(b) 1
(c) 3
(d) 4

Answer

Answer: (a)


44. How many digits will be there in the cube root of 512?
(a) 1
(b) 2
(c) 3
(d) 4

Answer

Answer: (a)


45. What will be the unit digit of \(\sqrt[3]{15625}\)?
(a) 5
(b) 0
(c) 3
(d) 4

Answer

Answer: (a)


46. How many zeros will be there in the cube root of 27000?
(a) 3
(b) 0
(c) 1
(d) 2

Answer

Answer: (c)


47. How many zeros will be there in the cube root of 800?
(a) 3
(b) 0
(c) 1
(d) cube root does not exist

Answer

Answer: (d)


48. If 7³=343 , then \(\sqrt[3]{343}\) = _________ .
(a) 3
(b) 7
(c) 13
(d) 9

Answer

Answer: (b)


49. If 8³ = 512 , then \(\sqrt[3]{512}\) = __________ .
(a) 3
(b) 7
(c) 13
(d) 9

Answer

Answer: (a)


50. What will be the unit digit of \(\sqrt[3]{216}\)?
(a) 3
(b) 6
(c) 4
(d) 2

Answer

Answer: (b)


We hope the given Maths MCQs for Class 8 with Answers Chapter 7 Cubes and Cube Roots will help you. If you have any query regarding CBSE Class 8 Maths Cubes and Cube Roots MCQs Pdf, drop a comment below and we will get back to you at the earliest.

Leave a Comment