Which of the following statements are true ? I. A circuit that adds two bits,…
2013
Which of the following statements are true ?
I. A circuit that adds two bits, producing a sum bit and a carry bit is called half adder.
II. A circuit that adds two bits, producing a sum bit and a carry bit is called full adder.
III. A circuit that adds two bits and a carry bit producing a sum bit and a carry bit is called full adder.
IV. A device that accepts the value of a Boolean variable as input and produces its complement is called an inverter.
- A.
I & II
- B.
II & III
- C.
I, II, III
- D.
I, III & IV
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Correct answer: D
Answer: Statements I, III and IV are true.
Statement I: A half adder adds two bits and produces a sum bit and a carry bit. This is true.
Statement II: Says a circuit that adds two bits producing sum and carry is called a full adder. This is false because that description fits a half adder; a full adder includes an additional input carry.
Statement III: A circuit that adds two bits and a carry input, producing a sum and a carry output, is called a full adder. This is true.
Statement IV: A device that takes a Boolean variable and outputs its complement is an inverter (NOT gate). This is true.
Therefore the correct set of true statements is I, III and IV.