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

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

• A A
• n A B
• 0 C
• 1 D

Boolean algebra is also known as.

• logical algebra A
• control algebra B
• switching algebra C
• programming algebra D

Boolean algebra use which of the following to represent arithmetic quantities.

• decimal digits A
• exponents B
• binary bits C
• fractions D

Which of the following gate is two level logic gate.

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

The number of inputs to full adder are

• 1 A
• 2 B
• 3 C
• 4 D

Pick up wrong logical expression

• 
  A
• 
  B
• 
  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

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

• 0 A
• 1 B
• x C
• 
  D

The circuit that is used for parallel to serial conversion is

• decoder A
• encoder B
• multiplexer C
• demultiplexer 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

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

• 0 A
• 1 B
• 3 C
• indeterminate D

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

• x A
• y B
• 1+x C
• 1+y D