WAEC Computer Studies 2025 Objective — Question 9

Question 9 of 50 from the West African Examinations Council (WAEC) Computer Studies 2025 Objective paper, with the correct answer and a full explanation.

Which of the following logic devices is a non-equivalent gate?

A. AND gate
B. EX-NOR gate
C. EX-OR gateCorrect
D. NOR gate

Explanation

A non-equivalent gate produces an output of 1 when its inputs are different. The EX-OR (XOR) gate exhibits this behaviour: output is 1 if inputs are (0,1) or (1,0), but 0 if both inputs are the same.

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