Number System Questions and answers

Topics

  1. Aptitude
    1. Compound interest
    2. Boat and Stream
    3. Trains
    4. Percentage
    5. Discount
    6. Mixture and Allegation
    7. Unitary Method
    8. Work and Wages
    9. Pipes and Cisterns
    10. Linear Equations
    11. Approximation
    12. Word problems
    13. Number System
    14. Time and Distance
    15. Average
    16. Ratio and Proportions
    17. Profit and Loss
    18. Partnership
    19. Permutation and combination
    20. Probability
    21. Problem on ages
    22. Time and work
    23. Simple and compound interest
    24. Mensuration
    25. Number series
111). Product of \( \Large \left(-25\right) \times \left(-6\right) \times 2 \times -5 \) is
A). 1500
B). -150
C). -1500
D). 150
112). 225 + 440 - 225 is
A). 10
B). -10
C). -100
D). 100
113). The two consecutive prime numbers with difference 2 are called
A). co-prime
B). composite
C). Twin Prime
D). even
114). Which of the following statement is false?
A). If a number is divisible by 8, it must be divisible by 4.
B). If a number is divisible by both 9 and 10, it must be divisible by 90.
C). The sum two consecutive odd of numbers is always divisible by 4.
D). The number divisible by 3 is always divisible by 9.
115). By Goldbach's conjecture, every even number greater than 4 can be expressed as a sum of
A). two even numbers
B). two odd prime numbers
C). two composite numbers
D). two co-prime numbers


116). Which of the following statement is true?
A). 1 is the smallest even number.
B). Every prime number is an odd number.
C). Sum of two prime number is always a prime number.
D). Product of two numbers is always composite
117). When a number is divided by seven, it has a remainder of 2. When it is divided by 6, it has a remainder of 3. What is the number?
A). 16
B). 44
C). 38
D). 51
118). Number of prime numbers from 1 to 50 are
A). 18
B). 15
C). 12
D). 20
119). The reciprocal of smallest prime number is
A). 0
B). 1
C). \( \Large \frac{1}{2} \)
D). 2
120). Which of the following number is a perfect number
A). 6
B). 28
C). Both (a) and (b)
D). None of these
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