From figure the output
M = PQ·(P + Q) ⊕ R
or M = ( P + Q)·(P + Q) ⊕ R
or M = ( PP + PQ + QP + QQ) ⊕ R
or M = (0 + PQ + QP + 0) ⊕ R
or M = P ⊕ Q ⊕ R
or M = (P XOR Q) XOR R

Correct Option: D

From figure the output
M = PQ·(P + Q) ⊕ R
or M = ( P + Q)·(P + Q) ⊕ R
or M = ( PP + PQ + QP + QQ) ⊕ R
or M = (0 + PQ + QP + 0) ⊕ R
or M = P ⊕ Q ⊕ R
or M = (P XOR Q) XOR R

Given expression Y = A B C D + ABCD + AB CD + ABC D
or Y = B CD( A + A) + ABCD + ABC D
or Y = ABCD + B CD + ABC D

Correct Option: D

Given expression Y = A B C D + ABCD + AB CD + ABC D
or Y = B CD( A + A) + ABCD + ABC D
or Y = ABCD + B CD + ABC D

From figure we conclude that LED will emits light when the output of NAND gate is zero. In order to make the output of NAND gate 0, the output of AND gate and EX-NOR gate must be 1. Applying hit and trail method. Finally we conclude that alternative (D) is the correct choice.

Correct Option: D

From figure we conclude that LED will emits light when the output of NAND gate is zero. In order to make the output of NAND gate 0, the output of AND gate and EX-NOR gate must be 1. Applying hit and trail method. Finally we conclude that alternative (D) is the correct choice.

When a binary adder is used as BCD adder, the sum is correct when it is > 9.

Correct Option: A

When a binary adder is used as BCD adder, the sum is correct when it is > 9.

When signed numbers are used in binary arithmetic, then 2’S complement notation would have unique representation for zero.

Correct Option: C

When signed numbers are used in binary arithmetic, then 2’S complement notation would have unique representation for zero.