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Number systems and logic gates

6 Class 11 Computer Science questions with answers and explanations.

Printable worksheet with answer key

All questions with answers

  1. What is the binary form of the decimal number 13?

    • 1 1011
    • 2 1110
    • 3 1001
    • 4 1101
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    Correct answer: 1101

    13 = 8 + 4 + 1, which is 1101.

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  2. What is the decimal value of binary 1010?

    • 1 12
    • 2 8
    • 3 10
    • 4 14
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    Correct answer: 10

    8 + 2 = 10.

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  3. What is the hexadecimal digit for decimal 15?

    • 1 10
    • 2 A
    • 3 F
    • 4 E
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    Correct answer: F

    Hexadecimal digits run 0 to 9 then A to F, with F = 15.

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  4. The output of an AND gate is 1 only when:

    • 1 Inputs differ
    • 2 All inputs are 0
    • 3 All inputs are 1
    • 4 Any input is 1
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    Correct answer: All inputs are 1

    AND needs all inputs high.

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  5. The output of NOT 1 is:

    • 1 1
    • 2 Undefined
    • 3 0
    • 4 2
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    Correct answer: 0

    NOT inverts its input.

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  6. In binary, 1 + 1 equals:

    • 1 10
    • 2 2
    • 3 11
    • 4 0
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    Correct answer: 10

    1 + 1 = 10 in binary.

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