Logic Circuit - Half Adder

Total number of inputs in a half adder is __________

• 2

• 3

• 4

• 1

If A and B are the inputs of a half adder, the sum is given by (a)  

• A AND B
• A OR B
• A XOR B
• A EX-NOR B

If A and B are the inputs of a half adder, the carry is given by __________

• A AND B

• A OR B

• A XOR B

• A EX-NOR B

Half-adders have a major limitation in that they cannot __________

• Accept a carry bit from a present stage

• Accept a carry bit from a next stage

• Accept a carry bit from a previous stage

• Accept a carry bit from the following stages

The difference between half adder and full adder is __________

• Half adder has two inputs while full adder has four inputs

• Half adder has one output while full adder has two outputs

• Half adder has two inputs while full adder has three inputs

• All of the Mentioned

If A, B and C are the inputs of a full adder then the sum is given by __________

• A AND B AND C

• A OR B AND C

• A XOR B XOR C

• A OR B OR C

If A, B and C are the inputs of a full adder then the carry is given by __________

• A AND B OR (A XOR B) AND C

• A OR B OR (A AND B) C

• (A AND B) OR (A AND B)C

• A XOR B XOR (A XOR B) AND C

How many AND, OR and XOR gates are required for the configuration of full adder?

• 1, 2, 2

• 2, 1, 2

• 3, 1, 2

• 4, 0, 1