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Syllabus

NEC Computer · Practice

Chapters & sets

1. Basic Electrical and Electronics

Basic Electrical

Set 1106

Basic Electronics

Set 171 Set 233

2. Digital Logic and Microprocessor

Digital Logic

Set 150 Set 250 Set 350 Set 450 Set 550 Set 650 Set 749 Set 851 Set 950 Set 1050 Set 1150 Set 1232

Microprocessor

Set 150 Set 250 Set 350 Set 445 Set 550 Set 650 Set 720 Set 850 Set 969

3. Programming Language and Its Applications

Mixed chapter MCQs

Set 150 Set 249 Set 349 Set 451 Set 540

4. Computer Organization and Embedded System

Mixed chapter MCQs

Set 150 Set 249 Set 350 Set 450 Set 550 Set 650 Set 750 Set 849 Set 950 Set 1050 Set 1150

5. Concept of Computer Network and Network Security System

Basic Networking

Set 150 Set 253

Advanced Networking

Set 150 Set 250 Set 350 Set 450 Set 550 Set 655

6. Theory of Computation and Computer Graphics

Theory of Computation

Set 150 Set 250 Set 360

Computer Graphics

Set 150 Set 251 Set 350 Set 450 Set 550

7. Data Structures and Algorithm, Database System and Operating System

8. Software Engineering and Object-Oriented Analysis & Design

Mixed chapter MCQs

Set 150 Set 250 Set 350 Set 450 Set 550 Set 650 Set 750 Set 926

9. Artificial Intelligence and Neural Networks

Mixed chapter MCQs

Set 150 Set 317 Set 450 Set 550 Set 650 Set 750 Set 850 Set 932

10. Project Planning, Design and Implementation

Engineering Drawing

Set 150 Set 267

Engineering Economics

Set 168

Project Planning & Scheduling

Set 188

Project Mangement

Set 150

Engineering Professional Practice

Set 120

Engineering Regulatory Body

Set 130

Digital Logic Set 10

50 questions

Question 1

( 2 \times 10^1 + 8 \times 10^0 )

50

equal to

A.
10
B.
2.8
C.
280
D.
28

Question 2

The binary number 1101 is equal to the decimal number

A.
13
B.
11
C.
49
D.
3

Question 3

The binary number 11011101 is equal to the decimal number

A.
121
B.
441
C.
221
D.
256

Question 4

The decimal number 17 is equal to the binary number

A.
10010
B.
10001
C.
11000
D.
01001

Question 5

The decimal number 175 is equal to the binary number

A.
11001111
B.
10101111
C.
10101110
D.
11101111

Question 6

The sum of 11010 + 01111 equals

A.
101001
B.
110101
C.
101010
D.
101000

Question 7

The difference of 110 - 010 equals

A.
001
B.
101
C.
010
D.
100

Question 8

The 1's complement of 10111001 is

A.
01000111
B.
11000110
C.
01000110
D.
10101010

Question 9

The 2's complement of 11001000 is

A.
00110111
B.
01001000
C.
00110001
D.
00111000

Question 10

The decimal number -34 is expressed in the 2's complement form as

A.
01011110
B.
11011110
C.
10100010
D.
01011101

Question 11

The decimal number +122 is expressed in the 2's complement form as

A.
01111010
B.
01000101
C.
11111010
D.
10000101

Question 12

A single-precision floating-point binary number has a total of

A.
8 bits
B.
24 bits
C.
16 bits
D.
32 bits

Question 13

In the 2's complement form, the binary number 10010011 is equal to the decimal number

A.
-19
B.
+91
C.
+109
D.
-109

Question 14

The binary number 101100111001010100001 can be written in hexadecimal as

A.
5471238
B.
2634521s
C.
5471241s
D.
23162501s

Question 15

The binary number 10001101010001101111 can be written in hexadecimal as

A.
$AD467(_{16})$
B.
$8D46F(_{16})$
C.
$8C46F(_{16})$
D.
$AE46F(_{16})$

Question 16

The binary number for

F7A9(_{16})

is

A.
1111011110101001
B.
1111111010110001
C.
1110111110101001
D.
1111011010101001

Question 17

The BCD number for decimal 473 is

A.
111011010
B.
010001110011
C.
110001110011
D.
010011110011

Question 18

Refer to Table 2-7. The word STOP in ASCII is

A.
1010011101010010011111010000
B.
1001010110110110011101010001
C.
1010010100110010011101010000
D.
1010011101010010011101100100

Question 19

The number of parity bits to be added o an 8-bit word for constructing Hamming code for detection

A.
1
B.
3
C.
2
D.
4

Question 20

A 7-bit Hamming code (even parity) 001001 for a BCD digit is known to have single error the encoded BCD digit is

A.
9
B.
3
C.
5
D.
0

Question 21

When the input to an inverter is HIGH (I), the output is

A.
HIGH or 1
B.
HIGH or 0
C.
LOW or 1
D.
LOW or 0

Question 22

An inverter performs an operation known as

A.
Complementation
B.
Inversion
C.
Assertion
D.
Both answers (A) and (B)

Question 23

The output of an AND gate with inputs A, B, and C is a 1 (HIGH) when

A.
A = 1, B = 1, C = 1
B.
A = 0, B = 0, C = 0
C.
A = 1, B = 0, C = 1
D.
Only answers (A) and (C)

Question 24

A pulse is applied to each input of a 2-input NAND gate. One pulse goes HIGH at t = 0 and goes back LOW at t = 1ms. The other pulse goes HIGH at t = 0.8 ms and goes back LOW at t = 3ms. The output pulse can be described as follows:

A.
It goes LOW at t = 0 and back HIGH at t = 3ms
B.
It goes LOW at t = 0.8 ms and back HIGH at t = 3 ms
C.
It goes LOW at t = 0.8 ms and back HIGH at t = 1 ms
D.
It goes LOW at t = 0.8 ms and back LOW at t = 1 ms

Question 25

A pulse is applied to each input of a 2-input NOR gate, one pulse goes HIGH at t = 0 and goes back LOW at t = 1ms. The other pulse goes HIGH at t = 0.8 ms and goes back LOW at t = 3 ms. The output pulse can be described as follows:

A.
It goes LOW at t = 0 and back HIGH at t = 3 ms.
B.
It goes LOW at t = 0.8 ms and back HIGH at t = 3ms
C.
It goes LOW at t = 0.8 ms and back HIGH at t = 1 ms
D.
It goes HIGH at t = 0.8 ms and back LOW at t = 1 ms

Question 26

A pulse is applied to each input of an exclusive-OR gate. One pulse goes HIGH at t = 0 and goes back LOW at t = 1 ms. The other pulse goes HIGH at t = 0.8 ms and goes back LOW at t = 3 ms. The output pulse can be described as follows:

A.
It goes HIGH at t = 0 and back LOW at t = 3 ms
B.
It goes HIGH at t = 0 and back LOW at t = 0.8ms
C.
It goes HIGH at t = .1 ms and back LOW at t = 3ms
D.
Both answers (B) and (C)

Question 27

For and AND gate

A.
All LOW input produce a HIGH output
B.
Output is HIGH if and only if all inputs are HIGH
C.
Output is LOW if and only if all inputs are HIGH
D.
Output is LOW if and only if all inputs are LOW

Question 28

The output of a gate is LOW when atleast one of its inputs is HIGH. This is true for

A.
AND
B.
OR
C.
NAND
D.
NOR

Question 29

The output of a gate is LOW when atleast one of its inputs is LOW. It is true for

A.
AND
B.
NAND
C.
OR
D.
NOR

Question 30

The output of a gate is HIGH when atleast one of its inputs is LOW. It is true for

A.
XOR
B.
NOR
C.
NAND
D.
OR

Question 31

The output of a gate is HIGH when atleast one of its inputs is HIGH. It is true for

A.
NAND
B.
OR
C.
AND
D.
XOR

Question 32

The output of a gate is HIGH if and only if all its inputs are HIGH. It is true for

A.
XOR
B.
OR
C.
AND
D.
NAND

Question 33

The output of a gate is LOW if and only if all its inputs are HIGH. It is true for

A.
AND
B.
NOR
C.
XNOR
D.
NAND

Question 34

The output of a gate is HIGH if and only if all its inputs are LOW. It is true for

A.
NOR
B.
NAND
C.
XOR
D.
XNOR

Question 35

The output of a gate is LOW if and only if all its inputs are LOW. It is true for

A.
XOR
B.
OR
C.
AND
D.
NOR

Question 36

The output of a 2-input gates is 1 if and only if its inputs are unequal. It is true for

A.
OR
B.
XNOR
C.
XOR
D.
NOR

Question 37

The output of a 2-input gates is 0 if and only if its inputs are unequal. It is true for

A.
XNOR
B.
NOR
C.
AND
D.
NAND

Question 38

The output of a 2-input gates is 1 if and only if its inputs are equal. It is true for

A.
AND
B.
OR
C.
XOR
D.
XNOR

Question 39

The output of a 2-input gates is 0 if and only if its inputs are unequal. It is true for

A.
AND
B.
OR
C.
XOR
D.
NOR

Question 40

The most suitable gate for comparing two bits is

A.
AND
B.
NAND
C.
OR
D.
XOR

Question 41

Which of the following gates can be used as an inverter?

A.
AND
B.
XOR
C.
OR
D.
None of the above

Question 42

Which of the following gates cannot be used as an inverter?

A.
NAND
B.
NOR
C.
AND
D.
XNOR

Question 43

The maximum number of 3-inputs gates in a 16-pin IC will be

A.
2
B.
4
C.
3
D.
5

Question 44

A quality having continuous values is

A.
A digital quantity
B.
A binary quantity
C.
An analog quantity
D.
A natural quantity

Question 45

The term bit means

A.
A small amount of data
B.
Binary digit
C.
A 1 or a 0
D.
Both answers (B) and (C)

Question 46

The time interval on the leading edge of a pulse between 10% and 90% of the amplitude is the

A.
Rise time
B.
Pulse width
C.
Fall time
D.
Period

Question 47

A pulse in a certain waveform occurs every 10 ms. The frequency is

A.
1 kHz
B.
100Hz
C.
1 Hz
D.
10 Hz

Question 48

In a certain digital waveform, the period is twice the pulse width. The duty cycle is

A.
100%
B.
50%
C.
200%
D.
150%

Question 49

An inverter

A.
Performs the NOT operation
B.
Changes a LOW to a HIGH
C.
Changes a HIGH to a LOW
D.
Does all of the above

Question 50

The output of an AND gate is HIGH when

A.
Any input is HIGH
B.
No inputs are HIGH
C.
All inputs are HIGH
D.
Both answers (A) and (C)

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