A Level Computer Science OCR Practice Exam

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Which logic circuit has two inputs and two outputs?

Full Adder
Half Adder
D-Type Flip Flop
Multiplexer

The correct answer is: Half Adder

The correct answer is the Full Adder. A Full Adder is a fundamental digital logic circuit that is designed to perform addition on three input bits: two significant bits and a carry bit from a previous addition. As a result, it produces two outputs: the sum and the carry out. The Half Adder, while it does have two inputs, is only capable of producing two outputs on its own without considering carry bits from previous calculations, which makes it not suitable as the answer. The D-Type Flip Flop is a memory element that has one data input and produces one output, making it also unsuitable for this question. A Multiplexer is designed to select one of several inputs and forward it to a single output, which does not fit the criteria of having two outputs. In summary, a Full Adder specifically caters to the requirements of this question, offering two outputs based on multiple inputs, making it the most accurate choice.