Class 8 Cubes And Cube Roots CBSE Questions & Answers

Class 8 · Cubes And Cube Roots

This is Mathematics Class 8 Cubes and Cube Roots CBSE Questions & Answers. There are 15 questions in this test with each question having around four answer choices.

Questions & Answers

1
The cube root of \({2^3} \times {2^3} \times {2^3} \times {7^3}\) is _______.
  • A
    76
  • B
    16
  • C
    None of these
  • D
    56
    Correct
2
Ones digit of cube of a number depends on the ________ of the number.
  • A
    none of these
  • B
    hundred digit
  • C
    ones digit
    Correct
  • D
    tens digit
3
For a perfect cube number, primes should be in ________.
  • A
    none of these
  • B
    doubles
  • C
    pair of 4
  • D
    triplets
    Correct
4
If any prime is not in triplet, then we have to multiply or divide by this _______ to make complete triplets.
  • A
    composite
  • B
    even
  • C
    odd
  • D
    prime
    Correct
5
If \({{\text{x}}^{\text{3}}} = {\text{ 9261}},{\text{ then x }} = {\text{ }} \ldots \ldots \)
  • A
    0
  • B
    21
    Correct
  • C
    31
  • D
    42
6
If\(\,\,{x^3} = \frac{{729}}{{2197}}\,\,\,{\text{and}}\,\,{y^3} = \frac{{9261}}{{42875}}\), then find \({\text{x }} + {\text{ y}}.\)
  • A
    \(\frac{{84}}{{65}}\)
    Correct
  • B
    65
  • C
    84
  • D
    none of these
7
Find the smallest number by which 243 must be multiplied to obtain a perfect cube.
  • A
    5
  • B
    3
    Correct
  • C
    7
  • D
    none of these
8
Evaluate the following: \(\sqrt[3]{{\frac{{0.027}}{{0.008}}}} \div \sqrt {\frac{{0.09}}{{0.04}}} - 1\)
  • A
    0
    Correct
  • B
    3
  • C
    10
  • D
    1
9
Evaluate the following: \(\sqrt[3]{{0.125}} + \sqrt[3]{{\frac{1}{{0.008}}}} - \sqrt[3]{{0.1 \times 0.1 \times 0.1 \times 1.3 \times 1.3 \times 1.3}}\)
  • A
    4.75
  • B
    5.85
  • C
    6.05
  • D
    5.37
    Correct
10
Find the one’s digit of the cube of 3331.
  • A
    2
  • B
    3
  • C
    1
    Correct
  • D
    0
11
Find the one’s digit of the cube of 8888.
  • A
    2
    Correct
  • B
    None of these
  • C
    1
  • D
    0
12
Find the one’s digit of the cube of 149.
  • A
    8
  • B
    9
    Correct
  • C
    6
  • D
    7
13
Find the one’s digit of the cube of 1225.
  • A
    5
    Correct
  • B
    2
  • C
    4
  • D
    3
14
Find the one’s digit of the cube of 2344.
  • A
    2
  • B
    4
    Correct
  • C
    3
  • D
    1
15
Find the one’s digit of the cube of 337.
  • A
    6
  • B
    5
  • C
    3
    Correct
  • D
    4