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Classes
- Grade 9
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Aptitude Tests

Browse Worksheets
Classes
- Grade 9
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- Grade 11
- Grade 12
Aptitude Tests

ECAT Computer Science Chapter 5

Leave a Comment / By Afshan JAMAL / August 29, 2026

Welcome to your ECAT Computer Science Chapter 5

The heart of analog to digital converter (ADC) is

Choose the correct option.

comparator

pulse generator

voltage source

current source

None

The number of inputs to full adder are

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1

2

3

4

None

An AND gate will function as OR if.

Choose the correct option.

all the inputs to the gates are "I"

all the inputs are "O"

a Not gate is added to it

all the inputs and outputs are complemented.

None

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

Choose the correct option.

Boolean addition

Boolean multiplication

Boolean complementation

All of the above

None

Boolean algebra is also known as.

Choose the correct option.

logical algebra

control algebra

switching algebra

programming algebra

None

Question Image

Choose the correct option.

x.y

x + y

x . y

x. y

None

The logic device that perform Boolean multiplication is.

Choose the correct option.

AND gate

OR gate

Inverter

None of these

None

Logical addition refers to operation of

Choose the correct option.

OR gate

AND gate

NOT gate

invertr gate

None

Boolean expression for NOR gate with two inputs x and y can be written as.

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x + y

x y

x + y

(x + y)'

None

Which of the following gate is two level logic gate.

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OR gate

AND gate

EXCLUSIVE OR gate

NAND gate

None

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

Choose the correct option.

A

n A

0

1

None

The circuit that is used for parallel to serial conversion is

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decoder

encoder

multiplexer

demultiplexer

None

NAND gates are preferred over others because these.

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have lower fabrication area

can be used to make any gate

consume least elctronic power

provide maximum density in a chip

None

The half adder circuit has

Choose the correct option.

one input

two inputs

three inputs

always more than two inputs

None

According to aborption law x+x.y=

Choose the correct option.

x

y

1 + x

1+ y

None

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

Choose the correct option.

6

32

64

128

None

Pick up wrong logical expression

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A + 0 = A

A . 1 = A

A + 1 = A

A . 0 = 0

None

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

Choose the correct option.

x

y

1+x

1+y

None

The 'Boolean Algebra' is based on the premise that

Choose the correct option.

there are two states

differential equations can be solved by analog circuits.

either a statement is true or faise

arithmetic operations can be carried out

None

According to Boolean algebra x+1=

Choose the correct option.

0

1

x

None

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