Class 8 Maths Chapter 7 (Cubes and Cube Roots) MCQs are available online for students. These multiple-choice questions are according to the CBSE syllabus and NCERT guidelines. The chapter-wise objective questions are given to make each student learn each concept and lead them to score better marks in exams.

## MCQs on Class 8 Cubes and Cube Roots

Multiple choice questions (MCQs) are given for Class 8 Cubes and Cube Roots chapter. Each problem has four multiple options, in which one is the right answer. Students have to solve each problem and choose the correct answer.

**1. The one’s digit of the cube of 53 is:**

A. 9

B. 3

C. 7

D. 1

Answer: **C**

Explanation: 533 = 53 x 53 x 53

33 = 3x3x3 = 27

Hence, at the 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: D**

Explanation: 64 = 2 x 2 × 2 x 2 x 2 x 2 = 26

**3. Which of the following is not a perfect cube?**

A. 216

B. 1000

C. 243

D. 1331

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: **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:** 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: **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: **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: **B**

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

**9. A perfect cube of a number having 0 at its unit place, ends with _____ zeros.**

A. 1

B. 2

C. 3

D. 4

Answer: **C**

Examples: 103 = 1000

203 = 8000

303 = 27000

**10. Cube root of 15625 is:**

A. 5

B. 15

C. 25

D. 35

Answer: **C**

Explanation: 15625 = 5 x 5 x 5 x 5 x 5 x 5

3√15625 = 5 × 5 = 25