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

Pick up wrong logical expression

• 
  A
• 
  B
• 
  C
• 
  D

• x + y A
• 
  B
• 
  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 Idempotent law , x + y = __________

• 1 A
• 0 B
• x C
• x . x D

Boolean algebra is.

• used for arithmetical operation is ALU A
• an aid for binary conversion B
• useful for error detection and error correction C
• used to describe the behavior and structure of logic networks and as an aid in the design of logic system D

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

• 5A A
• A B
• A⁵ C
• 1 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

According to aborption law x+x.y=

• x A
• y B
• 1 + x C
• 1 + y D

• x . y A
• x + y B
• x . y C
• x . 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

The number of inputs to full adder are

• 1 A
• 2 B
• 3 C
• 4 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

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

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

• 0 A
• 1 B
• x C
• 
  D