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

Logical addition refers to operation of

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

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

Odd parity of a word can be conveniently tested by.

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

• 0 A
• 1 B
• x C
• 
  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

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

• x A
• y B
• 1+x C
• 1+y 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 Boolean algebra x + 1 = ______________

• 0 A
• 1 B
• x 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

• x . y A
• x + y B
• x . y C
• 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

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

In Boolean algebra A.A.A.A.A

• 5A A
• A B
• A⁵ C
• 1 D