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Identify a logic gate from a description of its outputs

This type of question, asked 6 times: May 2021 S1, 15 May 2023 S1, 25 Apr 2025 S1, 26 Apr 2025 S2, 16 Apr 2026 S2, 19 Apr 2026 S1. All 6 questions below, oldest first.

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  1. Question 1

    May 2021 S1

    22
    In a two-input logic gate, when one input is 1 and the other is 0 the output is 1. But even if both inputs are 0, the output is 1. The logic gate is

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  2. Question 2

    15 May 2023 S1

    6
    Two different logic gates giving output '1' for the inputs (1,0) and then for (0,1) are

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  3. Question 3

    25 Apr 2025 S1

    31
    The logic gate for which the output goes 'HIGH' or ' 1 ' only when an odd number of 'HIGH' or ' 1 ' are at its input, is

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  4. Question 4

    26 Apr 2025 S2

    26
    In a certain 2 -inputs logic gate, when inputs A=0A = 0 and B=0B = 0, then output C=1C = 1. And also when inputs =0, B=1= 0,\text{ }B = 1, then again output C=1C = 1. The gate must be

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  5. Question 5

    16 Apr 2026 S2

    150
    In which of the logic gate the following statement is true? "The output is high when either of the inputs is high but not if both inputs are high"

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  6. Question 6

    19 Apr 2026 S1

    149
    For a two input logic gate, when the inputs are 'zero' and 'zero' the output is 'one'. When the inputs are 'one' and 'zero' the output is 'zero'. The type of logic gate is

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