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

The circuit that is used for parallel to serial conversion is

• decoder A
• encoder B
• multiplexer C
• demultiplexer 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

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

The number of inputs to full adder are

• 1 A
• 2 B
• 3 C
• 4 D

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

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

Which of the following gate is two level logic gate.

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

The 'Boolean Algebra' is based on the premise that

• there are two states A
• differential equations can be solved by analog circuits. B
• either a statement is true or false C
• arithmetic operations can be carried out D

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

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

• A A
• n A B
• 0 C
• 1 D

Logical addition refers to operation of

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

The half adder circuit has

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

The heart of analog to digital converter (ADC) is

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