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Number systems

Written by Usman Tariq (Computer Science)

5 Class 9 Computer Science questions with answers and explanations.

Printable worksheet with answer key

All questions with answers

  1. The base of the binary number system is:

    • 1 8
    • 2 16
    • 3 2
    • 4 10
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    Correct answer: 2

    Binary uses only 0 and 1.

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  2. What is the decimal value of the binary number 101?

    • 1 6
    • 2 7
    • 3 3
    • 4 5
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    Correct answer: 5

    1x4 + 0x2 + 1x1 = 5.

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  3. What is the binary form of the decimal number 6?

    • 1 101
    • 2 110
    • 3 111
    • 4 100
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    Correct answer: 110

    6 = 4 + 2, which is 110.

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  4. Which digit is not used in the binary system?

    • 1 1
    • 2 0
    • 3 All are used
    • 4 2
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    Correct answer: 2

    Binary uses only 0 and 1.

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  5. The base of the hexadecimal system is:

    • 1 8
    • 2 16
    • 3 2
    • 4 10
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    Correct answer: 16

    Hexadecimal is base 16.

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More Computer Science topics
Introduction to computers
Computer hardware
Software
Networks and the internet