Real Numbers

Class 10 · Mathematics

91 questions29 easy37 medium25 hard

Sample Questions

Q1.If p and q are two distinct primes, then p x q is:

  • AComposite
  • BPrime
  • CIrrational
  • DNeither prime nor composite

Q2.Which pair of numbers is co-prime?

  • A8 and 15
  • B6 and 9
  • C12 and 18
  • D14 and 21

Q3.The prime factorisation of the number 32760 involves how many distinct prime factors?

  • A5
  • B4
  • C6
  • D3

Q4.For three positive integers p, q, r, the relationship HCF(p,q,r) x LCM(p,q,r) = p x q x r is:

  • ANot always true
  • BAlways true
  • CTrue only for primes
  • DTrue only for co-primes

Q5.The prime factorisation of 7429 is:

  • A17 x 19 x 23
  • B7 x 1061
  • C11 x 675 + 4
  • D13 x 571 + 6

Q6.This is a sample question to preview what you'll get in the full practice test...

  • A. Option one
  • B. Option two
  • C. Option three
  • D. Option four
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Concepts Covered

Co-prime NumbersComposite NumbersEuclid's Division AlgorithmFundamental Theorem of ArithmeticHCF and LCMHCF x LCM = Product of two numbersIrrational NumbersPrime FactorisationProof by ContradictionRational Numbers and Decimal Expansions

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