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Study the diagram and answer the question.

Name the basic gate which is represented by the diagram.

Computer Science20200.5 marksShort answer
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Logic diagram: inputs A and B go to an OR-shaped gate with a bubble at its output (NOR); its output is joined to both inputs of a second NOR-shaped gate, whose output is X.

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The diagram is an OR gate. The first gate is a NOR gate; the second NOR gate has both its inputs joined, so it works as a NOT gate. NOR followed by NOT gives OR: $X = \overline{\overline{A+B}} = A + B$.
Computer Hardware

From ISC 2020 Computer Science Paper 1, question 1(e)(i).