Class 9 Computer MCQ with Answers Chapter 6

Boolean algebra was formulated in:

1840

1847

1850

1855

Boolean algebra was formulated by george Boole in:

1947

1847

1747

1647

Demorgan’s Law states that

a(b+c) = a.b+a.c

a+(b+c) = (a+b)+c

a̅+̅b̅ = a̅. b̅

None of these

The idempotent law status that for two variables x and y

x + x, y=x + and x. (x+y) = x

x = x

-x.x = x and x + x = x

None of these

The value of logical operator OR will be 1 if:

A = 0 & B = 1

A = 1 & B = 1

A = 1 & B = 1

all of these

Which of following logical operator is denoted by prime sign (/) or bar sign (-) over the variable?

AND

OR

NOT

NOR

A , A̅̅ =

0

1

A

A̅̅

Complement of 1 is:

0

1

2

3

A Boolean variable can only have one of the two values:

3,1

2,1

0,1

4,0

Computer chips are made up of:

Transistors

Vacuum tubes

Processors

All of these