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

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

An OR gate has 6 input. The number of input words in its truth table are.

• 6 A
• 32 B
• 64 C
• 128 D

In Boolean algebra A.0 is

• 0 A
• 1 B
• A+0 C
• A+1 D

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

• 0 A
• 1 B
• x C
• 
  D

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

• A A
• n A B
• 0 C
• 1 D

Which of the following gate is two level logic gate.

• OR gate A
• AND gate B
• EXCLUSIVE OR gate C
• NAND gate D

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

• 0 A
• 1 B
• 3 C
• indeterminate 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

The circuit that is used for parallel to serial conversion is

• decoder A
• encoder B
• multiplexer C
• demultiplexer D

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

• x A
• y B
• 1+x C
• 1+y D

• x + y A
• 
  B
• 
  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

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