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

• 0 A
• 1 B
• x C
• 
  D

• 0 A
• 1 B
• x C
• 
  D

In Boolean algebra A.0 is

• 0 A
• 1 B
• A+0 C
• A+1 D

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

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

• 0 A
• 1 B
• 3 C
• indeterminate D

The heart of analog to digital converter (ADC) is

• comparator A
• pulse generator B
• voltage source C
• current source D

Pick up wrong logical expression

• 
  A
• 
  B
• 
  C
• 
  D

According to Idempotent law , x + y = __________

• 1 A
• 0 B
• x C
• x . x D

The circuit that is used for parallel to serial conversion is

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

The number of inputs to full adder are

• 1 A
• 2 B
• 3 C
• 4 D

Odd parity of a word can be conveniently tested by.

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

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

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