Question

The square root of a natural number is irrational
always
sometimes
never

Answer 1

The square root of a natural number is irrational **sometimes**. Specifically, the square root of a natural number is irrational if that number is not a perfect square. For example, the square root of 2 is irrational, while the square root of 4 is rational (since it equals 2). Thus, it depends on whether the natural number is a perfect square or not.