Refer to CBSE Class 8 Mathematics Cubes and Cube Roots MCQs provided below. CBSE Class 8 Mathematics MCQs with answers available in Pdf for free download. The MCQ Questions for Class 8 Mathematics with answers have been prepared as per the latest syllabus, CBSE books and examination pattern suggested in Class 8 by CBSE, NCERT and KVS. Multiple Choice Questions for Chapter 7 Cubes and Cube Roots are an important part of exams for Class 8 Mathematics and if practiced properly can help you to get higher marks. Refer to more Chapter-wise MCQs for CBSE Class 8 Mathematics and also download more latest study material for all subjects
MCQ for Class 8 Mathematics Chapter 7 Cubes and Cube Roots
Class 8 Mathematics students should refer to the following multiple-choice questions with answers for Chapter 7 Cubes and Cube Roots in Class 8. These MCQ questions with answers for Class 8 Mathematics will come in exams and help you to score good marks
Chapter 7 Cubes and Cube Roots MCQ Questions Class 8 Mathematics with Answers
Question: The value of 3√343 X 3√−64 is
a) –28
b) –18
c) 28
d) 18
Answer: –28
Question: The length of each side of the cubical box is 2.4 m. Its volume is
a) 13.824 cu m
b) 13.824 cu cm
c) 13.824 cm2
d) None of these
Answer: 13.824 cu m
Question: The cube of a number is 8 times the cube of another number. If the sum of the cubes of numbers is 243, the difference of the numbers is
a) 3
b) 6
c) 4
d) none
Answer: 3
Question: The square of a natural number subtracted from its cube is 48. The number is
a) 4
b) 6
c) 5
d) 8
Answer: 4
Question: Which of the following numbers are perfect cubes?
a) 343
b) 5324
c) 108
d) 243
Answer: 343
Question: Which of the following are the cubes of even natural numbers?
a) 13824
b) 3375
c) 729
d) 1331
Answer: 13824
Question: Which of the following are the cubes of odd natural numbers?
a) 6859
b) 32768
c) 4096
d) 1728
Answer: 6859
Question: The cube root of 0.001728 is
a) 0.12
b) 12
c) 1.2
d) none
Answer: 0.12
Question: Choose the correct statement
a) All the above
b) Cubes of even natural numbers are even
c) Cubes of negative integers are negative
d) Cubes of odd natural numbers are odd
Answer: All the above
Question: If 72K is a perfect cube, then the value of K is
a) 3
b) 1
c) 2
d) 4
Answer: 3
Question: The cube root of 272 is
a) 9
b) 27
c) 3
d) none
Answer: 9
Question: The cube of 0.9 is
a) 0.729
b) none
c) 72.9
d) 7.29
Answer: 0.729
Question: The number which is not a perfect cube among the following is
a) 243
b) 1331
c) 216
d) 512
Answer: 243
Question: The smallest number by which 2560 must be multiplied so that the product is a perfect cube is
a) 25
b) 15
c) 5
d) 10
Answer: 25
Question: The smallest number by which 8788 must be divided so that the quotient is a perfect cube is
a) 4
b) 16
c) 12
d) 32
Answer: 4
Question: The cube root of 1.331 is
a) 1.1
b) 0.011
c) 0.11
d) 11
Answer: 1.1
Question: Two cubes have volume in the ratio 1 : 27. The ratio of the area of the face of one to that of the other is
a) 1 : 9
b) 1 : 3
c) 1 : 6
d) 1 : 18
Answer: 1 : 9
Question: By what least number must 21600 be multiplied to make it a perfect cube?
a) 10
b) 60
c) 6
d) 30
Answer: 10
Question: The smallest number by which 392 must be multiplied so that the product is a perfect cube is
a) 7
b) 3
c) 9
d) 5
Answer: 7
Question: How many small cubes with edges of 10 cm can be just accommodated in a cubical box of 1 m edge?
a) 1000
b) 10
c) 100
d) 10000
Answer: 1000
CHAPTER –7. CUBES & CUBE ROOTS.
Put a tick mark(√) on the correct answer :
Q1.Which of the following numbers must be subtracted from 345 to get a perfect cube ?
(i) 121
(ii) 131
(iii) 2
(iv) 24
Q2.Which of the following numbers is a perfect cube ?
(i) 343
(ii) 443
(iii) 543
(iv) 643
Q3.Which of the following numbers must be multiplied to 392 to get a perfect cube ?
(i) 2
(ii) 3
(iii) 4
(iv) 7
Q4. By which of the following numbers 10648 must be divided to get a perfect cube ?
(i) 2
(ii) 4
(iii) 5
(iv) 7
Q5.What is the volume of a cube whose each side is 4cm ?
(i) 24cm3
(ii) 48 cm3
(iii) 64 cm3
(iv) 125 cm3
Cubes and Cube Roots
1. The cube of a number is that number raised to the power 3.
2. A natural number is said to be a perfect cube if it is the cube of some natural number
3. Cubes of all even natural numbers are even
4. Cubes of all odd natural numbers are odd
5. Cubes of negative integers are negative
6. The cube root of a number x is that number whose cube gives x. It is denoted by 3√x
7. For any positive integer x, we have 3√-x = -3√x
8. For any integers a and b, we have
(i) -3√ab = 3√a X 3√x
1. The value of 3√343 x 3√-64 is
(A) 28
(B) –28
(C) 18
(D) –18
Answer : B
2. The length of each side of the cubical box is 2.4 m. Its volume is
(A) 13.824 cu m
(B) 13.824 cu cm
(C) 13.824 m2
(D) 13.824 cm2
Answer : A
3. The cube of a number is 8 times the cube of another number. If the sum of the cubes of numbers is 243, the difference of the numbers is
(A) 3
(B) 4
(C) 6
(D) none
Answer : A
4. The square of a natural number subtracted from its cube is 48. The number is
(A) 6
(B) 5
(C) 4
(D) 8
Answer : C
5. Which of the following numbers are perfect cubes?
(A) 108
(B) 343
(C) 243
(D) 5324
Answer : B
6. Which of the following are the cubes of even natural numbers?
(A) 729
(B) 3375
(C) 1331
(D) 13824
Answer : D
7. Which of the following are the cubes of odd natural numbers?
(A) 32768
(B) 4096
(C) 6859
(D) 1728
Answer : C
8. The cube root of 0.001728 is
(A) 0.12
(B) 1.2
(C) 12
(D) none
Answer : A
9. √2744 ÷ 3√0.008 =________
(A) 70
(B) 1.2
(C) 12.
(D) None
Answer : B
10. Choose the correct statement
(A) Cubes of odd natural numbers are odd
(B) Cubes of even natural numbers are even
(C) Cubes of negative integers are negative
(D) All the above
Answer : D
11. If 72K is a perfect cube, then the value of K is
(A) 1
(B) 2
(C) 3
(D) 4
Answer : C
12. The cube root of 272 is
(A) 27
(B) 9
(C) 3
(D) none
Answer : B
13. If a3 = b3 + c3 + d3, the least value of ‘a’ is
(A) 6
(B) 9
(C) 3
(D) none
Answer : A
14. The cube of 0.9 is
(A) 72.9
(B) 0.729
(C) 7.29
(D) none
Answer : B
15. The number which is not a perfect cube among the following is
(A) 1331
(B) 216
(C) 243
(D) 512
Answer : C
16. The smallest number by which 2560 must be multiplied so that the product is a perfect cube is
(A) 5
(B) 25
(C) 10
(D) 15
Answer : B
17. The smallest number by which 8788 must be divided so that the quotient is a perfect cube is
(A) 4
(B) 12
(C) 16
(D) 32
Answer : A
18. The cube root of 1.331 is
(A) 0.11
(B) 0.011
(C) 11
(D) 1.1
Answer : D
19. The close root of -512/729 is
(A) 4/7
(B) 8/9
(C) -8/9
(D) none
Answer : C
20. Two cubes have volume in the ratio 1 : 27. The ratio of the area of the face of one to that of the other is
(A) 1 : 3
(B) 1 : 6
(C) 1 : 9
(D) 1 : 18
Answer : C
21. By what least number must 21600 be multiplied to make it a perfect cube?
(A) 6
(B) 10
(C) 30
(D) 60
Answer : B
22. The volume of a cube whose surface area is 150 m2 is
(A) 25 m3
(B) 75 m3
(C) 125 m3
(D) 27 m3
Answer : C
23. The value of (4096)(1/√3)(√2)2 is
(A) 8
(B) 16
(C) 24
(D) 32
Answer : B
24. The smallest number by which 392 must be multiplied so that the product is a perfect cube is
(A) 3
(B) 5
(C) 7
(D) 9
Answer : C
25. How many small cubes with edges of 10 cm can be just accommodated in a cubical box of 1 m edge?
(A) 10
(B) 100
(C) 1000
(D) 10000
Answer : C
26. What is the smallest number by which 3600 can be divided to make it a perfect cube?
(A) 9
(B) 50
(C) 300
(D) 450
Answer : D
27. The volume of cubical box is 216 m3. The length of the longest rod that can be placed in the box is
(A) 6 m
(B) 6√2 m
(C) 6√3 m
(D) 12 m
Answer : C
28. Three numbers are in the ratio 1 : 2 : 3. The sum of their cubes is 98784. The greatest number is
(A) 28
(B) 14
(C) 42
(D) 7
Answer : C
29. The value of
(A) 1/4
(B) 1/8
(C) 1/2
(D) 1/16
Answer : C
30. The volume of a cubical box is 32.768 cubic meters. The length of one side of the box is
(A) 3.1 m
(B) 3.2 m
(C) 3.3 m
(D) 3.4 m
Answer : B
31. 3√√0.000064 equals
(A) 0.02
(B) 0.2
(C) 2.0
(D) 3.0
Answer : B
32. The value of 453 – 653 – 203 is
(A) 175500
(B) – 175500
(C) 170000
(D) – 170000
Answer : B
33. If 3√2744 ÷ 3√0.008 = x , then the value of x
(A) 70
(B) – 70
(C) 14
(D) – 14
Answer : B
34. The cube root of
(A) 4/3
(B) -(4/3)
(C) 2/3
(D) -(3/2)
Answer : D
35. The cube of a two-digit number may not have
(A) Four digits
(B) Five digits
(C) Six digits
(D) Seven digits
Answer : D
36. The value of
(A) 4.5
(B) 5.5
(C) 6.5
(D) 7.5
Answer : D
37. The cube root of (36)24/(24)/36 is
(A) (3/32)
(B) (3/32)2
(C) (3/32)3
(D) (3/32)4
Answer : D
38. The value of 3√81 + 3√192 + 3√375 / 3√24 is
(A) 0
(B) 1
(C) 2
(D) 3
Answer : C
39. The cube of an odd natural number, is
(A) Even
(B) Odd
(C) Even or odd
(D) Can’t say
Answer : B
40. Which of the following numbers is not a perfect cube?
(A) 46656
(B) 13825
(C) 3375
(D) 74088
Answer : B
41. If 36a4 = a6, then a3 is equal to
(A) (1/6)a6
(B) 6a4
(C) (1/6)a2
(D) 6a2
Answer : D
42. The value of
(A) 3
(B) 10/3
(C) 2/3
(D) 11/3
Answer : B
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