**Cubes and Cube Roots MCQ Questions Class 8 Maths Chapter 7**

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

**Cubes and Cube Roots MCQ Questions Class 8 Maths Chapter 7**

Cubes and Cube Roots Multiple Choice Questions with Answers Class 8 Maths Chapter 7 PDF is available.

**Question 1:**

**Find the cube root of 729. **

**(a) 9 **

**(b) 10 **

**(c) 11 **

**(d) 7 **

**Ans: **

Prime factorisation of 729 = 3×3×3×3×3

3×3 = 9

(a) 3√729 = 9

** **

**Question 2: **

**Find the cube root of 15625 **

**(a) 35 **

**(b) 45 **

**(c) 25 **

**(d) 15 **

**Ans: **

3√15625 = 5×5×5×5×5×5

= 5×5

3√15625 = 25 (c)

** **

**Question 3: **

**Find the cube root of 2197 **

**(a) 23 **

**(b) 13 **

**(c) 14**

**(d) 15 **

**Ans: **

Prime factorisation of 2197 = 13×13×13

3√2197 = 13 (b)

** **

**Question 4: **

**Find the cube root of 1000 **

**(a) 100 **

**(b) 15 **

**(c) 20 **

**(d) 10 **

**Ans: **

3√1000 = 5×2×5×2×5×2

= 5×2 = 10 (d)

** **

**Question 5: **

**Find 3****√3375 =? **

**(a) 15 **

**(b) 16 **

**(c) 17 **

**(d) 18 **

**Ans: **

3√3375 = 15 (a)

3375 = 5×3×5×3×5×3

= 5×3 = 15

** **

**Question 6: **

**Which of the following no. are not perfect cube? **

**(a) 333 **

**(b) 1128 **

**(c) 1331 **

**(d) 729 **

**Ans: **

(a) 333 = 3×111

The primes 3 and 111 do not appear in groups of three so 333 is not a perfect cube

** **

**Question 7: **

**2744 is the perfect cube? **

**(a) Yes **

**(b) No **

**(c) May be **

**(d) May not be **

**Ans: **

(a) Yes, 2744 = 7×2×7×2×7×2

3√2744 = 14

**In case you have missed:- Previous Chapter MCQ Questions**

**Question 8:**

**Find the smallest no by which 81 must be divided to obtain perfect cube **

**(a) 4 **

**(b) 3 **

**(c) 2 **

**(d) 9 **

**Ans: **

(b) 3, 81/3 = 27 = 3×3×3

√27 = 3

** **

**Question 9: **

**Find the smallest number by which 72 must be multiplied to obtain a perfect cube? **

**(a) 3 **

**(b) 4 **

**(c) 2 **

**(d) 5 **

**Ans: **

(a) 3, 72 × 3 = 216 = 3×2×3×2×3×2

3√216 = 6

** **

**Question 10: **

**Find the 3√125 =? **

**(a) 3 **

**(b) 6 **

**(c) 5 **

**(d) 15 **

**Ans: **

(c) 5 = 125 = 5×5×5

3√125 = 5

** **

**Question 11: **

**Find the cube root of 4913 **

**(a) 15 **

**(b) 17 **

**(c) 13 **

**(d) 14 **

**Ans: **

4916 = 17×17×17

3√4913 =17 (b)

** **

**Question 12: **

**Find the cube of 18 **

**(a) 5831 **

**(b) 6859 **

**(c) 5832 **

**(d) 6831 **

**Ans: **

18×18×18 = 324×18

18^{3} = 5832 (c)

** **

**Question 13: **

**Find the cube of 8 **

**(a) 612 **

**(b) 516 **

**(c) 729 **

**(d) 512 **

**Ans: **

8×8×8 = 512

8^{3} = 512 (a)

** **

**Question 14: **

**Find the cube root of 6859 **

**(a) 17 **

**(b) 13 **

**(c) 16 **

**(d) 19 **

**Ans: **

6859 = 19×19×19

3√6859 = 19 (d)

** **

**Question 15: **

**Which are not perfect cube? **

**(a) 729 **

**(b) 1331 **

**(c) 1728 **

**(d) 2000 **

**Ans: **

(d) 2000 is not perfect cube because

2000 = 2×5×2×5×2×5×2

Prove 2 do not appear in group of three.

**In case you have missed:- Next Chapter MCQ Questions**