√1 (option A)
Step-by-step explanation:
Given numbers: √ 1, √ 2, √ 3, √ 5
Rational numbers are numbers that can be written in the form of fraction.
Let's check out the options:
a) √ 1 = 1
Whole numbers can be written as fraction by making their denominators to be 1. 1 is an whole number
So 1 = 1/1
This is a rational number
Note: Squareroots of non perfect squares are irrational
b) 2, 3 and 5 are non perfect squares.
Hence, the squareroots of the non perfect squares are irrational.
The correct answer is √1 (option A)