Rational and Irrational NumbersPractice Questions & MCQs
Practice Rational and Irrational Numbers questions from Number Systems (Class 9 Maths) - important MCQs with answers and step-by-step solutions. Solve the sample questions below, then 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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Where can I practise Rational and Irrational Numbers questions for Class 9 Maths?
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Are these Rational and Irrational Numbers questions important for the exam?
Yes. These Rational and Irrational Numbers important questions follow the Maths exam pattern (CBSE Boards, plus JEE and NEET foundation), so they help with both school and competitive prep.
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