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

According to Idempotent law , x + y = __________

• 1 A
• 0 B
• x C
• x . x D

Logical multiplication refers to operation of.

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

The half adder circuit has

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

• 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 aborption law x+x.y=

• x A
• y B
• 1 + x C
• 1 + y D

Boolean algebra is.

• used for arithmetical operation is ALU A
• an aid for binary conversion B
• useful for error detection and error correction C
• used to describe the behavior and structure of logic networks and as an aid in the design of logic system D

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

• A A
• n A B
• 0 C
• 1 D

The circuit that is used for parallel to serial conversion is

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

In Boolean algebra A.0 is

• 0 A
• 1 B
• A+0 C
• A+1 D

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

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

Logical addition refers to operation of

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

If A and B are two 1-bit numbers, what logic gates will be required to test for A=B?

• NOR gate A
• EXCLUSIVE OR gate B
• EXCLUSIVE NOT gate C
• OR gate D

• x . y A
• x + y B
• x . y C
• x . y D