Discrete Mathematics Questions and Answers – Number Theory – Prime Numbers

This set of Discrete Mathematics Multiple Choice Questions & Answers (MCQs) focuses on “Number Theory – Prime Numbers”.

1. The number of factors of prime numbers are ___________
a) 2
b) 3
c) Depends on the prime number
d) None of the mentioned
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2. What is the number ‘ 1’?
a) Prime number
b) Composite number
c) Neither Prime nor Composite
d) None of the mentioned
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3. All prime numbers are odd.
a) True
b) False
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4. 3 is the smallest prime number possible.
a) True
b) False
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5. How many prime numbers are there between 1 to 20?
a) 5
b) 6
c) 7
d) None of the mentioned
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6. There are finite number of prime numbers.
a) True
b) False
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7. Sum of two different prime number is a ____________
a) Prime number
b) Composite number
c) Either Prime or Composite
d) None of the mentioned
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8. Difference of two distinct prime numbers is?
a) Odd and prime
b) Even and composite
c) None of the mentioned
d) All of the mentioned
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9. If a, b, c, d are distinct prime numbers with an as smallest prime then a * b * c * d is a ___________
a) Odd number
b) Even number
c) Prime number
d) None of the mentioned
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10. If a, b are two distinct prime number than a highest common factor of a, b is ___________
a) 2
b) 0
c) 1
d) ab
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Sanfoundry Global Education & Learning Series – Discrete Mathematics.

To practice all areas of Discrete Mathematics, here is complete set of 1000+ Multiple Choice Questions and Answers.

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