Correct Answers: | |

Wrong Answers: | |

Unattempted: |

### Question 1

One-third of the cube-root of which number is 0.6?

### Question 2

What is cube root of 0.000008?

### Question 3

If $2√3 + √27 = 8.66$, then what is the value of $√27 + 4√3$?

**A**

12.12.

**B**

12.24.

**C**

12.00.

**D**

12.36.

**Soln.**

**Ans: a**

The given expression can be rearranged like this: $2√3 + √{3^{2} × 3}$, which is same as $2√3 + 3√3$ which is same as $5√3 = 8.66$, from which we get $√3 = 1.73$. Next we can see that $√27 + 4√3$ is same as $√{3^{2} × 3} + 4√3$, which is same as $7√3$, which gives $7 × 1.73$ = 12.12.

### Question 4

What is the value of ${√17}/6$ − $5/{√17}$?

**A**

${-13√17}/102$.

**B**

${+13√17}/102$.

**C**

${-5√17}/102$.

**D**

${+5√17}/102$.

**Soln.**

**Ans: a**

The given expression can be simplified to ${{(√17)^2} - 6 × 5}/{6 × √17}$, which is same as ${17 - 30}/{6 × √17}$, which is same as ${-13/{6 × √17}$. Rationalizing, we get ${-13/{6 × √17} × {√17/√17}$ which gives ${-13√17}/102$

### Question 5

If $4√5 + √80 = 17.89$, then what is the value of $√125 + 6√5$?

**A**

24.60.

**B**

12.25.

**C**

25.

**D**

12.96.

**Soln.**

**Ans: a**

The given expression can be rearranged like this: $4√5 + √{4^{2} × 5}$, which is same as $4√5 + 4√5$ which is same as $8√5 = 17.89$, from which we get $√5 = 2.24$. Next we can see that $√125 + 6√5$ is same as $√{5^{2} × 5} + 6√5$, which is same as $11√5$, which gives $11 × 2.24$ = 24.60.

### More Chapters | See All...

Probability | Alligations and Mixtures | Ranking Test | Clocks and Calendars | abba Series | Areas | Missing Numbers | Simple Interest | Bricks and Blocks | Problems on Numbers | More...

This Blog Post/Article "Square and Cube Roots Quiz Set 001" by Parveen (Hoven) is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International License.

Updated on 2017-06-24.