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Which option contains a pair consisting of one rational and one irrational real number?

Answer and explanation

Correct answer: \(5\) and \(\sqrt{2}\)

\(5\) is rational because it can be written as \(\frac{5}{1}\). \(\sqrt{2}\) is irrational because 2 is not a perfect square, so its decimal expansion is non-terminating and non-repeating. Therefore, option A contains one rational and one irrational real number. In option C, both numbers are irrational, while both numbers in options B and D are rational. Exam tip: The square root of a perfect square is rational; the square root of a non-perfect square is irrational.

Related tags

Real NumbersRational NumbersIrrational NumbersNumber SystemsClass 9MathematicsClass 9 Mcq

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