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

The output will be one in case any input is one in the case of.

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

In Boolean algebra A.0 is

• 0 A
• 1 B
• A+0 C
• A+1 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

According to Boolean algebra x + 1 = ______________

• 0 A
• 1 B
• x C
• 
  D

According to Boolean algebra A+A+......+A is

• A A
• n A B
• 0 C
• 1 D

• A + B + C + D A
• 
  B
• A BC D C
• A + B + C + D D

• 0 A
• 1 B
• x C
• 
  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

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 aborption law x+x.y=

• x A
• y B
• 1 + x C
• 1 + y D

According to Idempotent law , x + y = __________

• 1 A
• 0 B
• x C
• x . x D

The half adder circuit has

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

Pick up wrong logical expression

• 
  A
• 
  B
• 
  C
• 
  D

Boolean expression for NOR gate with two inputs x and y can be written as.

• x + y__ A
• x. y B
• x + y C
• 
  D