Digital Circuit and Microprocessor MCQs

Question 1

The octal number 1170, 76051 when converted to decimal number will be

Accepted Answer

632.97

Answer

622.67

Answer

632.37

Answer

632.17

Question 2

The hexadecimal number AB6 is equal to decimal number

Accepted Answer

2742

Answer

2274

Answer

2427

Answer

2247

Question 3

Indigital computer the numbere 127 is stored as

Accepted Answer

1111111

Answer

10001

Answer

11000111

Answer

100100111

Question 4

Which logic gate is similar to the function of two series switches?

Accepted Answer

AND

Answer

OR

Answer

NAND

Answer

All of the above

Question 5

Which logic function has the output low only when both inputs are high?

Accepted Answer

NAND

Answer

OR

Answer

NOR

Answer

AND

Question 6

Which of the following relation is invalid according to Boolean algebra?

Accepted Answer

X+X= 0

Answer

0 +X=X

Answer

1+X=1

Answer

X+X=X

Question 7

According to Boolean algebra which of the follciwing relation is not valid?

Accepted Answer

X . X = 1

Answer

X + = 1

Answer

0 . X = 0

Answer

1 . X = 1

Question 8

According to Boolean algebra which of the following relation is not valid?

Accepted Answer

X =1

Answer

X+Y=Y+X

Answer

X.Y=Y.X

Answer

X + (Y+Z)= (X +Y)+Z

Question 9

According to Boolean algebra which of the following relation is not valid?

Accepted Answer

XY+ YZ + YZ=XYZ

Answer

X (X + Y)= X

Answer

(X + Y) (X + Z) = X + YZ

Answer

X+XY=X+Y