# MCQ IN COMPUTER SCIENCE & ENGINEERING

## COMPUTER SCIENCE AND ENGINEERING

### COMPUTER ARCHITECTURE

 Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
Half Adder is an combinational circuit that performs the arithematic addition of ____ number of bits
 A 3 B 2 C 1 D Any
Explanation:

Detailed explanation-1: -Half adder is a combinational logic circuit with two inputs and two outputs. The half adder circuit is designed to add two single bit binary number A and B. It is the basic building block for addition of two single bit numbers. This circuit has two outputs carry and sum.

Detailed explanation-2: -4.1. A full adder circuit is central to most digital circuits that perform addition or subtraction. It is so called because it adds together two binary digits, plus a carry-in digit to produce a sum and carry-out digit. It therefore has three inputs and two outputs.

Detailed explanation-3: -A half adder just adds two bits together and gives a two-bit output. A full adder adds two inputs and a carried input from another adder, and also gives a two-bit output.

Detailed explanation-4: -The half adder determines the least significant bit of the sum as the XOR of the least significant bits of the inputs. The carry output of the half adder becomes the carry input of the full adder. The full adder computes the sum of the inputs A1 and A2 and the carry bit. Example: A=3 (11) and B=1 (01): S0=0.

Detailed explanation-5: -A logic circuit that can perform addition of 2-bits is the HALF ADDER. It is used to add 2-bits using using one EXOR gate where as carry operation can be performed using AND gate. Analysis: Let the two inputs are A and B .

There is 1 question to complete.