Question

Which one of the following is an irrational number ? Choose the correct alternative answer for the question given below.
(A) √16/25
(B) √5
(C) 3/9
(D) √196

Answer 1

B. √5 is an irrational no.

Answer 2

Option ( B ) is correct .

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The number which cannot be

expressed as terminating or

non - terminating recurring

decimal is called an irrational

number .

The number which is in the

form of p/q , p,q are integers

And q ≠ 0 is called rational

number .

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Here ,

i ) √16/√25 = 4/5 ( p/q form )

Rational number

ii ) √5 an irrational number

iii ) 3/9 = 1/3 ( p/q form )

Rational number

iv ) √196 = 13/1 ( p/q form )

Rational number.

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