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Syllabus

NEC Electronics · Practice

Chapters & sets

1. Basic Electrical and Electronics Engineering

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 Systems

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. Computer Networks and Network Security

Basic Networking

Set 150 Set 253

Advanced Networking

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

10. Project Planning, Design and Implementation

Mixed chapter MCQs Set 5

50 questions

Question 1

Property of locality of reference may fail if a program has

A.
Many conditional jumps
B.
Many operands
C.
Many unconditional jumps
D.
All of the above

Question 2

In Reverse Polish notation, expression A*B+C*D is written as

A.
AB\*CD++
B.
AB*CD+*
C.
A\*BCD++
D.
A*B*CD+

Question 3

SIMD represents an organization that______.

A.
Refers to a computer system capable of processing several programs at the same time.
B.
Represents organization of single computer containing a control unit, processor unit and a memory unit.
C.
Includes many processing units under the supervision of a common control unit
D.
None of the above

Question 4

Floating point representation is used to store

A.
Boolean values
B.
Real integers
C.
Whole numbers
D.
Integers

Question 5

Suppose that a bus has 16 data lines and required 4 cycles of 250 nano seconds each to transfer data. The bandwidth of this bus would be 2 Megabytes/sec. If the cycle time of the bus was reduced to 125 nsecs and the number of cycles required for transfer stayed the same what would the bandwidth of the bus?

A.
1 Megabyte/sec
B.
8 Megabytes/sec
C.
4 Megabytes/sec
D.
2 Megabytes/sec

Question 6

Assembly language

A.
Uses alphabetic codes in place of binary numbers used in machine language
B.
Is the easiest language to write programs
C.
Need not be translated into machine language
D.
None of the above

Question 7

In computers, subtraction is generally carried out by

A.
9's complement
B.
1's complement
C.
10's complement
D.
2's complement

Question 8

The amount of time required to read a block of data from a disk into memory is composed of seek time, rotational latency, and transfer time. Rotational latency refers to

A.
The time it takes for the platter to make a full rotation
B.
The time it takes for the read-write head to move into position over the appropriate track
C.
The time it takes for the platter to rotate the correct sector under the head
D.
None of the above

Question 9

What characteristic of RAM memory makes it not suitable for permanent storage?

A.
Too slow
B.
It is volatile
C.
Unreliable
D.
Too bulky

Question 10

Computers use addressing mode techniques for:

A.
Giving programming versatility to the user by providing facilities as pointers to memory counters for loop control
B.
To reduce no. of bits in the field of instruction
C.
Specifying rules for modifying or interpreting address field of the instruction
D.
All the above

Question 11

The circuit used to store one bit of data is known as

A.
Register
B.
Decoder
C.
Encoder
D.
Flip-flop

Question 12

(2FAOC)16 is equivalent to:

A.
(195 084)10
B.
Both A and B
C.
(001011111010 0000 1100)
D.
None of these

Question 13

The average time required to reach a storage location in memory and obtain its contents is called the:

A.
Seek time
B.
Turnaround time
C.
Access time
D.
Transfer time

Question 14

Which of the following is not a weighted code?

A.
Decimal number system
B.
Binary Number System
C.
Excess-3 code
D.
None of the above

Question 15

______ register keeps track of the instructions stored in program stored in memory.

A.
AR (Address Register)
B.
PC (Program Counter)
C.
XR (Index Register)
D.
AC (Accumulator)

Question 16

The addressing mode used in an instruction of the form ADD X Y, is

A.
Absolute
B.
Index
C.
Indirect
D.
None of the above

Question 17

In a memory-mapped I/O system, which of the following will not be there?

A.
LDA
B.
ADD
C.
IN
D.
OUT

Question 18

In a vectored interrupt:

A.
The branch address is assigned to a fixed location in memory
B.
The interrupting source supplies the branch information to the processor through an interrupt vector
C.
The branch address is obtained from a register in the processor
D.
None of the above

Question 19

Cache memory acts between

A.
CPU and RAM
B.
CPU and HARDSIK
C.
RAM and ROM
D.
None of the above

Question 20

Write Through technique is used in which memory for updating the data:

A.
Virtual memory
B.
Auxiliary memory
C.
Main memory
D.
Cache memory

Question 21

Generally Dynamic RAM is used as main memory in a computer system as it

A.
Consumes less power
B.
Has lower cell density
C.
Has higher speed
D.
Needs refreshing circuitry

Question 22

In signed-magnitude binary division, if the dividend is (11100)₂ and divisor is (10011)₂ then the result is

A.
(00100)₂
B.
(11001)₂
C.
(10100)₂
D.
(01100)₂

Question 23

Virtual memory consists up:

A.
Static RAM
B.
Magnetic memory
C.
Dynamic RAM
D.
None of the above

Question 24

In a program using subroutine call instruction, it is necessary

A.
Initialize program counter
B.
Reset the microprocessor
C.
Clear the accumulator
D.
Clear the instruction register

Question 25

When CPU is executing a Program that is part of the Operating System, it is said to be in

A.
Interrupt mode
B.
Half mode
C.
System mode
D.
Simplex mode

Question 26

A-Flip Flop can be converted into T-Flip Flop by using additional logic circuit

A.
D = T . Qn
B.
D = T . Qn
C.
D = T
D.
D = TAQn

Question 27

Logic X-OR operation of (4ACO) H& (B53F) H results

A.
AACB
B.
FFFF
C.
0000
D.
ABCD

Question 28

An n-bit microprocessor has

A.
n-bit program counter
B.
n-bit ALU
C.
n-bit address register
D.
n-bit instruction register

Question 29

Cache memory works on the principle of:

A.
Locality of data
B.
Locality of reference
C.
Locality of memory
D.
Locality of reference and memory

Question 30

The main memory in a Personal Computer (PC) is made of:

A.
Cache memory
B.
Dynamic RAM
C.
Static RAM
D.
Both 2 and 3

Question 31

The circuit converting binary data into decimal is

A.
Encoder
B.
Decoder
C.
Multiplexer
D.
Code converter

Question 32

PSW is saved in stack when there is a

A.
Interrupt recognized
B.
Execution of CALL instruction
C.
Execution of RST instruction
D.
All of these

Question 33

A combinational logic circuit which sends data coming from a single source to two or more separate destinations is:

A.
Decoder
B.
Multiplexer
C.
Encoder
D.
Demultiplexer

Question 34

In which addressing mode the operand is given explicitly in the instruction:

A.
Absolute
B.
Indirect
C.
Immediate
D.
Direct

Question 35

The gray code equivalent of (1011)₂ is

A.
1101
B.
1110
C.
1010
D.
1111

Question 36

A system program that translates and executes an instruction simultaneously is:

A.
Compiler
B.
Assembler
C.
Interpreter
D.
Operating system

Question 37

When necessary, the results are transferred from the CPU to main memory by

A.
I/O devices
B.
Shift registers
C.
CPU
D.
None of the above

Question 38

A successive A/D converter is:

A.
A medium speed converter
B.
A low speed converter
C.
A high-speed converter
D.
None of these

Question 39

The memory unit that communicates directly with the CPU is called the

A.
Main memory
B.
Shared memory
C.
Secondary memory
D.
Auxiliary memory

Question 40

The average time required to reach a storage location in memory and obtains its content is called:

A.
Latency time
B.
Turnaround time
C.
Access time
D.
Response time

Question 41

A k-bit field can specify:

A.
3(^k) register
B.
K(^2) register
C.
2(^k) register
D.
K(^3) register

Question 42

The time interval between the adjacent bits is called:

A.
Word-time
B.
Turnaround time
C.
Bit-time
D.
Slice time

Question 43

A group of bits that tell the computer to perform a specific operation is known as:

A.
Instruction code
B.
Accumulator
C.
Micro–operation
D.
Register

Question 44

The load instruction is mostly used to designate a transfer from memory to a processor register known as:

A.
Accumulator
B.
Program counter
C.
Instruction register
D.
Memory address register

Question 45

The communication between the components in a microcomputer takes place via:

A.
I/O bus
B.
Address bus
C.
Data bus
D.
Control lines

Question 46

An instruction pipeline can be implemented by means of:

A.
LIFO buffer
B.
Stack
C.
FIFO buffer
D.
None of above

Question 47

Data input command is a just the opposite of a:

A.
Test command
B.
Data output
C.
Control command
D.
Data channel

Question 48

The operation executed on data stored in registers is called:

A.
Macro–operation
B.
Bit-operation
C.
Micro–operation
D.
Byte-operation

Question 49

MRI indicates:

A.
Memory Reference Information
B.
Memory Register Instruction
C.
Memory Reference Instruction
D.
Memory Register Information

Question 50

Self-contained sequence of instructions that performs a given computational task is:

A.
Function
B.
Subroutine
C.
Procedure
D.
Routine

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