Test Index

WAEC Computer Studies 2018 Paper

Question : 40

Total: 51

Solution:

Concept:

An XOR (exclusive-OR) gate gives an output of

1

only when its two inputs are different.

Explanation:

From the truth table in Figure 3, the output

Z

1

for input combinations

01

and

10

For input combinations

00

and

11

, the output

Z

0

This behaviour matches the XOR truth table exactly: output is high only when the inputs differ.

XOR and EX-OR are different names for the same gate.

Answer:

XOR gate, i.e. Option A.

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