PERT Practice Test 2026 – Complete Guide for Exam Prep

Question: 1 / 400

Which of the following is an example of an irrational number?

2

√2

An irrational number is a type of real number that cannot be expressed as a fraction of two integers, meaning it cannot be represented exactly as a ratio of whole numbers. The decimal expansion of an irrational number goes on forever without repeating.

The number √2 is a well-known example of an irrational number. Its approximate value is 1.41421356..., and it continues indefinitely without repeating. There is no way to write √2 as a fraction where both the numerator and denominator are integers.

In contrast, the other options represent rational numbers. The number 2 can be expressed as 2/1, making it a ratio of integers. Likewise, 4/2 simplifies to 2, which is rational, and 0.5 can be expressed as 1/2, also a ratio of integers. Thus, √2 stands out as the only option that meets the criteria of an irrational number.

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4/2

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