# Which of the Following is Irrational? - Mathematics

MCQ

Which of the following is irrational?

#### Options

• $\sqrt{\frac{4}{9}}$

• $\sqrt{\frac{4}{5}}$

• $\sqrt{7}$

• $\sqrt{81}$

#### Solution

Given that

sqrt4/9 = 2/3

4/5 = 0.8

sqrt81  9

And 7 is not a perfect square.

Concept: Concept of Irrational Numbers
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#### APPEARS IN

RD Sharma Mathematics for Class 9
Chapter 1 Number Systems
Exercise 1.7 | Q 5 | Page 40

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