Correct Answers: | |

Wrong Answers: | |

Unattempted: |

### Question 1

What is cube root of 0.000512?

### Question 2

What is the least number that should be subtracted from 0.0449 to make it a perfect square?

### Question 3

If $√5$ = 2.24, then what is the value of ${√5}/2$ − $2/{√5}$ + $√125$?

**A**

11.404.

**B**

1.414.

**C**

22.414.

**D**

0.707

**Soln.**

**Ans: a**

The given expression can be simplified to ${{(√5)^2} - {2 × 2} + {2 × √5 × √{5 × 5^2}}}/{2 × √5}$, which is same as ${5 - 4 + 50}/{2 × √5}$, which is same as ${51/{2 × √5}$. Rationalizing, we get ${51/{2 × √5} × {√5/√5}$ which gives ${51√5}/10$ which = 11.404.

### Question 4

What is the value of $√{(13 - 3√5) × (13 + 3√5)}$?

### Question 5

If x = 0.2054, then what is the value of $8x + √{16x^2 - 8x + 1}$?

### More Chapters | See All...

Surds and Indices | Deductive Reasoning | Problems on Ages | Paper Folding | Missing Numbers | Volume and Surface Areas | Blood Relations | Square and Cube Roots | Ranking Test | abba Series | More...

This Blog Post/Article "Square and Cube Roots Quiz Set 016" 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