ECAT Pre Computer Science MCQ Test For Computer Chapter 5 With Answer

The half adder circuit has

• one input A
• two inputs B
• three inputs C
• always more than two inputs D

Which of the following operations are used by Boolean algebra.?

• Boolean addition A
• Boolean multiplication B
• Boolean complementation C
• All of the above D

The logic device that perform Boolean multiplication is.

• AND gate A
• OR gate B
• Inverter C
• None of these D

Logical multiplication refers to operation of.

• OR gate A
• AND gate B
• NOT gate C
• inverter gater D

The commutative law in Boolean Algebra, where a, b and c are binary number is.

• a+0=a A
• a+1=1 B
• a+b=b+a C
• a. (b+c) = a.b +a.c. D

NAND gates are preferred over others because these.

• have lower fabrication area A
• can be used to make any gate B
• consume least elctronic power C
• provide maximum density in a chip D

In a three input NAND gate, if all the inputs are 1, the output is.

• 0 A
• 1 B
• 3 C
• indeterminate D

Boolean description for the exclusive OR gate for two inputs x and y can be written as.

• x + y __ A
• _x _y B
• x. y + x. y C
• x . y + x .y D

An AND gate will function as OR if.

• all the inputs to the gates are "I" A
• all the inputs are "O" B
• a Not gate is added to it C
• all the inputs and outputs are complemented D

According to absorption law x. (x+y) =

• x A
• y B
• 1+x C
• 1+y D

Odd parity of a word can be conveniently tested by.

• OR gate A
• XOR gate B
• NOR gate C
• NAND gate D

• x + y A
• 
  B
• 
  C
• 
  D

Which of the following statement is true in the case of AND gate with input A and B.

• If A and B are applied, there will not be any output A
• If neither input is applied, there will be an output B
• If one input is applied there will not be any output C
• If one input is applied there will be an output D

According to Idempotent law , x + y = __________

• 1 A
• 0 B
• x C
• x . x D

Which of the following function is referred as the complementary.?

• OR function A
• NOT function B
• NAND function C
• AND function D