Rational and Irrational Numbers MCQs
Practice Rational and Irrational Numbers multiple-choice questions from Number Systems (Class 9 Maths) - tap an answer for instant feedback and a step-by-step solution. Practice the full set free on the RankByte app.
Rational and Irrational NumbersQuiz - Solve & Score
Q1. A surfer rides a wave measured at 0.6 metres of face; rational or irrational?
- A.Irrational
- B.Neither rational nor irrational
- C.Undeterminable
- D.Rational
Answer: D. Rational
0.6: 0.6 is a terminating decimal equal to a fraction. Hence the number is rational.
Q2. A pharmacist dilutes a drug to a concentration of cbrt(30) mol/L; does that strength sit among the rationals or the irrationals?
- A.Undeterminable
- B.Neither rational nor irrational
- C.Irrational
- D.Rational
Answer: C. Irrational
cbrt(30): 30 is not a perfect cube, so cbrt(30) is irrational. Hence the number is irrational.
Q3. An optician grinds a lens to a power of cbrt(3); rational or irrational?
- A.Rational
- B.Neither rational nor irrational
- C.Undeterminable
- D.Irrational
Answer: D. Irrational
cbrt(3): 3 is not a perfect cube, so cbrt(3) is irrational. Hence the number is irrational.
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