Correct Answers: | |

Wrong Answers: | |

Unattempted: |

### Question 1

If $√5$ = 2.24, then what is the value of ${√5}/2$ − $4/{√5}$?

**A**

-0.671.

**B**

+0.671.

**C**

6.71.

**D**

-6.71.

**Soln.**

**Ans: a**

The given expression can be simplified to ${{(√5)^2} - 2 × 4}/{2 × √5}$, which is same as ${5 - 8}/{2 × √5}$, which is same as ${-3/{2 × √5}$. Rationalizing, we get ${-3/{2 × √5} × {√5/√5}$ which gives ${-3√5}/10$ which = -0.671.

### Question 2

What is the value of ${√16/6}$ × ${5/√4}$ × ${6/√25}$?

### Question 3

One-fifth of the cube-root of which number is 0.3?

### Question 4

What is the value of ${√5}/3$ − $2/{√5}$?

**A**

${-1√5}/15$.

**B**

${+1√5}/15$.

**C**

${-2√5}/15$.

**D**

${+2√5}/15$.

**Soln.**

**Ans: a**

The given expression can be simplified to ${{(√5)^2} - 3 × 2}/{3 × √5}$, which is same as ${5 - 6}/{3 × √5}$, which is same as ${-1/{3 × √5}$. Rationalizing, we get ${-1/{3 × √5} × {√5/√5}$ which gives ${-1√5}/15$

### Question 5

If x = 0.7342, then what is the value of $11x + √{16x^2 - 8x + 1}$?

This Blog Post/Article "Square and Cube Roots Quiz Set 013" by Parveen (Hoven) is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International License.

Updated on 2020-02-07. Published on: 2016-04-20