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Number System MCQs 2026

45 questions with detailed answers · 19 from past papers · 5 quiz batches available

📚 Maths Mcqs 📄 19 Past-Paper Qs ✓ Free · No Login Needed
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Read each question, think about the answer, then click Show Answer to reveal the correct option and explanation. Load 10 at a time so it stays manageable — perfect for one-topic study sessions on the bus or during a break.

Page 1 of 1 Questions 1–10 of 45
  1. Q1 Past Paper · PPSC/FPSC/NTS easy

    The smallest composite number is

    1. A 2
    2. B 4
    3. C 6
    4. D 1
    💡 Explanation:

    4 is the smallest composite number (its factors are 1, 2 and 4).

  2. Q2 Past Paper · PPSC/FPSC/NTS easy

    How many prime numbers are there between 1 and 10

    1. A 2
    2. B 3
    3. C 5
    4. D 4
    💡 Explanation:

    The primes between 1 and 10 are 2, 3, 5 and 7, giving 4 primes.

  3. Q3 Past Paper · PPSC/FPSC/NTS easy

    The only even prime number is

    1. A 4
    2. B 6
    3. C 2
    4. D 0
    💡 Explanation:

    2 is the only even number that is prime.

  4. Q4 Past Paper · PPSC/FPSC/NTS easy

    The smallest whole number is

    1. A 0
    2. B 1
    3. C 2
    4. D -1
    💡 Explanation:

    Whole numbers start from 0, so the smallest whole number is 0.

  5. Q5 Past Paper · PPSC/FPSC/NTS easy

    The smallest natural number is

    1. A 0
    2. B 2
    3. C -1
    4. D 1
    💡 Explanation:

    Natural numbers start from 1, so the smallest natural number is 1.

  6. Q6 Past Paper · PPSC/FPSC/NTS easy

    The smallest prime number is

    1. A 1
    2. B 2
    3. C 3
    4. D 4
    💡 Explanation:

    2 is the smallest prime number and the only even prime.

  7. Q7 easy

    Which of the following is an odd number

    1. A 24
    2. B 36
    3. C 47
    4. D 50
    💡 Explanation:

    47 is not divisible by 2, so it is an odd number.

  8. Q8 easy

    A number divisible by 2 is called a/an

    1. A Even number
    2. B Odd number
    3. C Prime number
    4. D Composite number
    💡 Explanation:

    Any number exactly divisible by 2 is an even number.

  9. Q9 Past Paper · PPSC/FPSC/NTS easy

    The sum of the first 10 natural numbers is

    1. A 45
    2. B 55
    3. C 50
    4. D 60
    💡 Explanation:

    Sum = n(n+1)/2 = 10×11/2 = 55.

  10. Q10 Past Paper · PPSC/FPSC/NTS easy

    The number 1 is

    1. A Prime
    2. B Composite
    3. C Neither prime nor composite
    4. D An even prime
    💡 Explanation:

    1 is neither prime nor composite by definition.

  11. Q11 Past Paper · PPSC/FPSC/NTS medium

    How many prime numbers are there between 1 and 20

    1. A 8
    2. B 9
    3. C 10
    4. D 7
    💡 Explanation:

    The primes up to 20 are 2,3,5,7,11,13,17,19 — a total of 8.

  12. Q12 easy

    The sum of the first 5 natural numbers is

    1. A 10
    2. B 20
    3. C 25
    4. D 15
    💡 Explanation:

    Sum = 1+2+3+4+5 = 15, or 5×6/2 = 15.

  13. Q13 easy

    The reciprocal of 5 is

    1. A 5
    2. B -5
    3. C 0
    4. D 1/5
    💡 Explanation:

    The reciprocal of a number n is 1/n, so the reciprocal of 5 is 1/5.

  14. Q14 easy

    The number just before 1000 is

    1. A 1001
    2. B 999
    3. C 998
    4. D 1000
    💡 Explanation:

    The number immediately before 1000 is 999.

  15. Q15 easy

    How many even numbers lie between 1 and 10 (exclusive)

    1. A 3
    2. B 5
    3. C 4
    4. D 6
    💡 Explanation:

    The even numbers between 1 and 10 are 2, 4, 6 and 8, giving 4 numbers.

  16. Q16 Past Paper · PPSC/FPSC/NTS easy

    The value of √144 is

    1. A 12
    2. B 14
    3. C 16
    4. D 11
    💡 Explanation:

    √144 = 12 because 12×12 = 144.

  17. Q17 easy

    The square of 12 is

    1. A 24
    2. B 121
    3. C 169
    4. D 144
    💡 Explanation:

    12² = 12×12 = 144.

  18. Q18 easy

    The value of 2 raised to the power 5 (2⁵) is

    1. A 10
    2. B 16
    3. C 32
    4. D 64
    💡 Explanation:

    2⁵ = 2×2×2×2×2 = 32.

  19. Q19 Past Paper · PPSC/FPSC/NTS easy

    The value of 5 cubed (5³) is

    1. A 15
    2. B 125
    3. C 25
    4. D 625
    💡 Explanation:

    5³ = 5×5×5 = 125.

  20. Q20 easy

    Which of the following is a whole number but not a natural number

    1. A 0
    2. B 1
    3. C 2
    4. D 5
    💡 Explanation:

    0 is a whole number but not a natural number.

  21. Q21 Past Paper · PPSC/FPSC/NTS easy

    The product of any number and 0 is

    1. A The number itself
    2. B 1
    3. C Undefined
    4. D 0
    💡 Explanation:

    Multiplying any number by 0 gives 0.

  22. Q22 Past Paper · PPSC/FPSC/NTS medium

    The largest 2-digit prime number is

    1. A 91
    2. B 93
    3. C 97
    4. D 99
    💡 Explanation:

    97 is prime and is the largest prime below 100.

  23. Q23 medium

    Which of the following numbers is divisible by 6

    1. A 112
    2. B 114
    3. C 115
    4. D 119
    💡 Explanation:

    114 is even and 1+1+4 = 6 is divisible by 3, so it is divisible by 6.

  24. Q24 medium

    Which of the following numbers is divisible by 4

    1. A 116
    2. B 114
    3. C 118
    4. D 122
    💡 Explanation:

    A number is divisible by 4 if its last two digits are; 16 is divisible by 4, so 116 is.

  25. Q25 Past Paper · PPSC/FPSC/NTS medium

    The number 0 is

    1. A An odd number
    2. B A prime number
    3. C Neither even nor odd
    4. D An even number
    💡 Explanation:

    0 is divisible by 2, so it is considered an even number.

  26. Q26 easy

    The value of 1 + 3 + 5 + 7 is

    1. A 12
    2. B 15
    3. C 16
    4. D 18
    💡 Explanation:

    1+3+5+7 = 16, which is also 4² (sum of first 4 odd numbers).

  27. Q27 Past Paper · PPSC/FPSC/NTS medium

    The sum of the first n odd numbers is

    1. A 2n
    2. B n squared
    3. C n(n+1)/2
    4. D n
    💡 Explanation:

    The sum of the first n odd numbers equals n², e.g. 1+3+5 = 9 = 3².

  28. Q28 easy

    Which of the following is a prime number

    1. A 23
    2. B 15
    3. C 21
    4. D 33
    💡 Explanation:

    23 has only two factors, 1 and 23, so it is prime.

  29. Q29 easy

    Which of the following is a composite number

    1. A 2
    2. B 3
    3. C 5
    4. D 9
    💡 Explanation:

    9 has factors 1, 3 and 9, so it is composite; the others are prime.

  30. Q30 easy

    The predecessor of 100 is

    1. A 101
    2. B 100
    3. C 99
    4. D 98
    💡 Explanation:

    The predecessor is the previous number, so 100−1 = 99.

  31. Q31 easy

    The successor of 99 is

    1. A 98
    2. B 100
    3. C 99
    4. D 101
    💡 Explanation:

    The successor of a number is the next number, so 99+1 = 100.

  32. Q32 easy

    The smallest 3-digit number is

    1. A 100
    2. B 111
    3. C 99
    4. D 101
    💡 Explanation:

    The smallest three-digit number is 100.

  33. Q33 easy

    The largest 3-digit number is

    1. A 100
    2. B 900
    3. C 998
    4. D 999
    💡 Explanation:

    The largest three-digit number is 999.

  34. Q34 Past Paper · PPSC/FPSC/NTS medium

    The HCF of two co-prime numbers is

    1. A 0
    2. B 2
    3. C 1
    4. D Their product
    💡 Explanation:

    Co-prime numbers share no common factor other than 1, so their HCF is 1.

  35. Q35 Past Paper · PPSC/FPSC/NTS easy

    How many factors does a prime number have

    1. A 2
    2. B 1
    3. C 3
    4. D 0
    💡 Explanation:

    A prime number has exactly two factors: 1 and itself.

  36. Q36 easy

    The face value of 7 in the number 4750 is

    1. A 700
    2. B 70
    3. C 750
    4. D 7
    💡 Explanation:

    The face value of a digit is the digit itself, so it is 7.

  37. Q37 easy

    The place value of 7 in the number 4750 is

    1. A 7
    2. B 700
    3. C 70
    4. D 750
    💡 Explanation:

    7 is in the hundreds place, so its place value is 7×100 = 700.

  38. Q38 easy

    The sum of two even numbers is always

    1. A Odd
    2. B Prime
    3. C Even
    4. D Zero
    💡 Explanation:

    Even + even always gives an even number, e.g. 4+6 = 10.

  39. Q39 easy

    The product of two odd numbers is always

    1. A Odd
    2. B Even
    3. C Zero
    4. D Prime
    💡 Explanation:

    Odd × odd always gives an odd number, e.g. 3×5 = 15.

  40. Q40 Past Paper · PPSC/FPSC/NTS medium

    A number that can be written in the form p/q (q ≠ 0) is called a/an

    1. A Irrational number
    2. B Prime number
    3. C Natural number
    4. D Rational number
    💡 Explanation:

    A rational number can be expressed as a ratio p/q where q ≠ 0.

  41. Q41 Past Paper · PPSC/FPSC/NTS medium

    The number √2 is an example of a/an

    1. A Rational number
    2. B Irrational number
    3. C Natural number
    4. D Whole number
    💡 Explanation:

    √2 cannot be written as a simple fraction, so it is irrational.

  42. Q42 easy

    Which of the following numbers is divisible by 10

    1. A 105
    2. B 315
    3. C 220
    4. D 412
    💡 Explanation:

    A number ending in 0 is divisible by 10, so 220 qualifies.

  43. Q43 medium

    Which of the following numbers is divisible by 9

    1. A 234
    2. B 235
    3. C 236
    4. D 238
    💡 Explanation:

    2+3+4 = 9, which is divisible by 9, so 234 is divisible by 9.

  44. Q44 easy

    Which of the following numbers is divisible by 5

    1. A 52
    2. B 58
    3. C 61
    4. D 55
    💡 Explanation:

    A number ending in 0 or 5 is divisible by 5, so 55 qualifies.

  45. Q45 easy

    Which of the following numbers is divisible by 3

    1. A 121
    2. B 123
    3. C 124
    4. D 125
    💡 Explanation:

    1+2+3 = 6, which is divisible by 3, so 123 is divisible by 3.

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