Correct Answers: | |

Wrong Answers: | |

Unattempted: |

### Question 1

If $√2$ = 1.41, then what is the value of ${√2}/5$ − $13/{√2}$ + $√8$?

**A**

-6.081.

**B**

+6.081.

**C**

-6.009.

**D**

+6.009.

**Soln.**

**Ans: a**

The given expression can be simplified to ${{(√2)^2} - {5 × 13} + {5 × √2 × √{2 × 2^2}}}/{5 × √2}$, which is same as ${2 - 65 + 20}/{5 × √2}$, which is same as ${-43/{5 × √2}$. Rationalizing, we get ${-43/{5 × √2} × {√2/√2}$ which gives ${-43√2}/10$ which = -6.081.

### Question 2

What is √0.0064?

### Question 3

What is √(9720) × √(30)?

### Question 4

What is cube root of 0.000343?

### Question 5

If x = 0.8547, then what is the value of $4x + √{16x^2 - 8x + 1}$?

### More Chapters | See All...

Paper Cutting | Cubes and Dice | Permutations and Combinations | Compound Interest | Alphabet Number Series | abba Series | HCF and LCM | Problems on Trains | Averages | Areas | More...

This Blog Post/Article "Square and Cube Roots Quiz Set 005" 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