1. A full adder has
(A) 3-inputs, 2-outputs
(B) 2-inputs, 3-outputs
(C) 2-inputs, 2-outputs
(D) 3-inputs, 3-outputs
2. A logic circuit which adds only 2-bits is called
(A) Half Adder
(B) Full Adder
(C) Parallel Adder
(D) Both a & b
3. If inputs to a half adder are A = 1 and B = 1, then outputs are
(A) ∑ = 1, Co = 0
(B) ∑ = 1, Co = 1
(C) ∑ = 0, Co = 0
(D) ∑ = 0, Co = 1
4. A full adder consists of
(A) Two half adders and one OR gate
(B) Two XOR gates
(C) Two AND gates
(D) Both a & c
5. A half adder consists of
(A) XOR and AND gate
(B) AND and NOT gate
(C) XOR and OR gate
(D) OR and AND gate
6. If inputs to a full adder are A = 1, B = 1, and Cin = 0, then outputs are
(A) ∑ = 1, Co = 0
(B) ∑ = 1, Co = 1
(C) ∑ = 0, Co = 1
(D) ∑ = 0, Co = 0
7. A half adder has
(A) 3-inputs, 2-outputs
(B) 2-inputs, 3-outputs
(C) 2-inputs, 2-outputs
(D) 3-inputs, 3-outputs
8. A logic circuit which adds 3-bits is called
(A) Half Adder
(B) Parallel Adder
(C) Full Adder
(D) Both a & b
9. In half subtractor, logic gate is used for borrow.
(A) XOR
(B) OR
(C) NAND
(D) AND
10. A logic circuit that accepts the carry input.
(A) Comparator
(B) Half Adder
(C) Subtractor
(D) Full Adder