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

Which of the following operations are used by Boolean algebra.?

• Boolean addition A
• Boolean multiplication B
• Boolean complementation C
• All of the above D

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

• A A
• n A B
• 0 C
• 1 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

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

An OR gate has 6 input. The number of input words in its truth table are.

• 6 A
• 32 B
• 64 C
• 128 D

Odd parity of a word can be conveniently tested by.

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

According to Idempotent law , x + y = __________

• 1 A
• 0 B
• x C
• x . x 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

• 0 A
• 1 B
• x C
• 
  D

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

• 0 A
• 1 B
• x C
• 
  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

Logical addition refers to operation of

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

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

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