Digital Circuit and Microprocessor MCQs

Question 1

In Excess-3 code each coded number is that in the BCD code.

Accepted Answer

three larger

Answer

four larger

Answer

three smaller

Answer

much larger

Question 2

In positive logic, logic state 1 corresponds to

Accepted Answer

higher voltage level

Answer

positive voltage

Answer

zero voltage

Answer

lower voltage level

Question 3

In negative logic, the logic state 1 corresponds to 15 ?10 037

Accepted Answer

lower voltage level

Answer

negative voltage

Answer

zero voltage

Answer

more negative voltage

Question 4

The output of a 2-input OR gate is zero only when its

Accepted Answer

both inputs are 0

Answer

either input is 1

Answer

both inputs are 1

Answer

eigher input is 0

Question 5

An XOR gate produces an output only when its two inputs are

Accepted Answer

different

Answer

high

Answer

low

Answer

same

Question 6

For getting an output from an XNOR gate, its both inputs must be

Accepted Answer

at the same logic level

Answer

high

Answer

low

Answer

at the opposite logic level

Question 7

In a certain 2-input logic gate, when A = 0, B = 0, then C= I. It must be gate.

Accepted Answer

NAND

Answer

XOR

Answer

AND

Answer

NOR

Question 8

. Boolean algebra is essentially based on

Accepted Answer

logic

Answer

symbols

Answer

truth

Answer

numbers

Question 9

Different variables used in Boolean algebra canhave values of

Accepted Answer

0 or 1

Answer

low or high

Answer

true or false

Answer

ON or OFF