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

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

• A A
• n A B
• 0 C
• 1 D

The output will be one in case any input is one in the case of.

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

According to Idempotent law , x + y = __________

• 1 A
• 0 B
• x C
• x . x 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

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

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

• x A
• y B
• 1+x C
• 1+y D

According to aborption law x+x.y=

• x A
• y B
• 1 + x C
• 1 + y D

The number of inputs to full adder are

• 1 A
• 2 B
• 3 C
• 4 D

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

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

• 5A A
• A B
• A⁵ C
• 1 D

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

• 0 A
• 1 B
• 3 C
• indeterminate D

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

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

In Boolean algebra A.0 is

• 0 A
• 1 B
• A+0 C
• A+1 D

Logical addition refers to operation of

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