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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 9

50 questions

Question 1

In modern computers bipolar semiconductor chips are often used in the arithmetic logic unit. What material is used for the slower and less expensive primary storage section?

A.
Gallium arsenide (GaAs)
B.
Silicon
C.
Metal oxide semiconductor
D.
Gallium arsenide chips

2

Which type of memory chips are likely to be used in the primary storage of the future generation of computers?

A.
Selenium chips
B.
Bio chips
C.
Optical chips
D.
Gallium arsenide chips

Question 3

How many bits can be stored in the 8K capital?

A.
8000
B.
4000
C.
8192
D.
4096

Question 4

If a computer has a 1024 K memory, then what does the letter K stands for?

A.
Kilometer
B.
1024
C.
Thousand
D.
Core

Question 5

What was the amount of memory required by the earliest operating system called dos 1.0?

A.
4K
B.
16K
C.
8K
D.
32K

Question 6

The storage device which is used to compensate for the difference in rates of flow of data from one device to another is called

A.
Cache
B.
Buffer
C.
Concentrator
D.
I/O device

Question 7

As a secondary storage medium, what is the most important advantage of a video disk?

A.
Laser disk
B.
Durability
C.
Potential capacity
D.
Cost effectiveness

Question 8

What is the size of optical compact disk which is used for recording high quality music?

A.
4.7-inch
B.
5½ inch
C.
3½ inch
D.
8 inch

Question 9

Which part of the diskette never be touched?

A.
Hub
B.
Oval slot
C.
Hole in the center
D.
Corner

Question 10

Memory is

A.
A device that performs a sequence of operations specified by instruction in memory
B.
The device where information in stored
C.
A sequence of instruction
D.
Typically characterized by interactive processing and time-slicing of the CPU's time to allow quick response to each user

Question 11

Virtual memory

A.
Is a method of memory allocation by which the program is subdivided into equal portions, 8 pages and core is subdivided into equal portions
B.
Consists of those addresses that may be generated by a processor during execution of a computation
C.
Is a method of allocating processor time
D.
Allows multiple programs to reside in separate areas of core at a time

Question 12

AROM is used to store the table for multiplication of two 8 -bit unsigned integers. The size of ROM required is

A.
256K x 6
B.
4K x 16
C.
64K x 8
D.
64K x 16

Question 13

The controller uses ______ to help with the transfers when handling network interfaces.

A.
Input Buffer Storage
B.
Bridge circuits
C.
Signal enhancers
D.
All of the above

Question 14

To overcome the conflict over the possession of the BUS we use ______.

A.
Optimizers
B.
Multiple BUS structure
C.
BUS arbitrators
D.
None of the above

Question 15

The seek time of a disk is 30 ms. It rotates at the rate of 30 rotations/second. The capacity of each track is 300 words. The access time is (approximately)

A.
62 ms
B.
50 ms
C.
60 ms
D.
47 ms

Question 16

How many RAM chips of size (256K x 1 bit) are required to build 1 M byte memory?

A.
8
B.
24
C.
10
D.
32

Question 17

If each address space represents one byte of storage space, how many address lines are needed to access RAM chips arranged in a 4 x 6 array, where each chip is 8K x 4 bits?

A.
13
B.
16
C.
15
D.
17

Question 18

In a memory system, four 256 x 8 PROM chips are used to make total memory of size 1024 x 4. What is the number of address bus lines?

A.
4
B.
10
C.
8
D.
16

Question 19

Consider a high speed 40 ns memory cache with a successful hit ratio of 80%. The regular memory has an access time of 100 ns. What is the average effective time for CPU to access memory?

A.
52 ns
B.
70 ns
C.
60 ns
D.
80 ns

Question 20

What is the hit ratio of a cache if a system performs memory access at 30 nano seconds with the cache and 150 nano seconds without it? Assume that the each uses 20 nano sec memory, choose the closest approximate

A.
81%
B.
92%
C.
75%
D.
87%

Question 21

Consider a disk with the following characteristics 1. Track size: 10,000 bytes 2. Rotational latency: 10 ms / revaluation 3. Block size: 1,000 bytes 4. What is the maximum transfer rate per track measured in bits per second as is conventional for this disk unit?

A.
400 Mbps
B.
6,400 Mbps
C.
8 Mbps
D.
4,250 Mbps

Question 22

Increasing the RAM of a computer typically improves the performance because:

A.
Virtual memory increases
B.
Larger RAMs are faster
C.
Fewer page faults occurs
D.
Fewer segmentation faults occur

Question 23

Which of the following requires a device driver?

A.
Register
B.
Cache
C.
Main memory
D.
Disk

Question 24

Which one of the following statements is false?

A.
Virtual memory implements the translation of a programs address space into physical memory address
B.
Virtual memory allows each program to exceed the size of the primary memory
C.
Virtual memory increases the degree of multiprogramming
D.
Virtual memory reduces the context switching overhead

Question 25

The advantage of CMOS technology over a MOS is

A.
Lower power dissipation
B.
Greater speed
C.
Smaller chip size
D.
All of the above

Question 26

The advantage of synchronous circuits over asynchronous one is...

A.
Faster operation
B.
Better noise immunity
C.
Both A and B
D.
Lower hardware equipment

Question 27

Which of the following is not a form of memory?

A.
Instruction cache
B.
Instruction register
C.
Instruction code
D.
Translation lookaside buffer

Question 28

In 2's complement, addition overflow

A.
Is tagged whenever there is a carry for sign bit addition
B.
Cannot occur when a positive value is added to a negative value
C.
Is flagged when the carries from sign bit and previous bit match
D.
None of the above

Question 29

The performance of the pipelined processor suffers if...

A.
The pipeline stage has different delay
B.
Consecutive instructions depend on each other
C.
The pipeline sages share hardware resources
D.
All of the above

Question 30

In absolute addressing mode...

A.
The operand is inside the instruction
B.
The address of the operand is inside the instruction
C.
The register containing the address of the operand is specified in the instruction
D.
Location of the operand is implicit

Question 31

A processor needs software interrupt to

A.
Test the interrupt system of the processor
B.
Implement co routines
C.
Obtain system services which need execution of privileged instructions
D.
Return from subroutine

Question 32

Horizontal microprogramming...

A.
Does not require use of signal decoders
B.
Results in larger sized micro-instructions than vertical micro-programming
C.
Use one bit for each control signal
D.
All of the above

Question 33

The main difference (s) between a CISC and RISC processor is/are that a RISC processor typically has

A.
A fewer instruction
B.
A fewer addressing mode
C.
A more register, an ease to implement using hardwired control logic
D.
All of the above

Question 34

The exponent of a floating-point number is represented in excess -N code so that

A.
The dynamic range is large
B.
The precision is high
C.
The smallest number is represented by all zeros
D.
Overflow is avoided

Question 35

If negative numbers are stored in 2's complement form, the range of numbers that can be stored in 8 bits is......

A.
-128 to +128
B.
-128 to +127
C.
-127 to +128
D.
-127 to +127

Question 36

On receiving an interrupt from an I/O device, the CPU

A.
Halts for a pre-determined time
B.
Hands over control of address bus and data bus to the interrupting device
C.
Branches off to the interrupt service routine immediately
D.
Branches off to the interrupt service routine after completion of the current instruction

Question 37

In serial communication, an extra clock is needed

A.
To synchronize the devices
B.
For programmed baud rate control
C.
To make efficient use of RS-232
D.
None of the above

Question 38

Which of the following rules regarding the addition of 2 given numbers is correct, if negative numbers are represented in 2's complement form?

A.
Add sign bit and discard carry, if any.
B.
Add sign bit and add carry, if any.
C.
Don't add sign bit and discard carry, if any.
D.
Don't add sign bit and add carry, if any.

Question 39

The difference between 80486 and 80386 is/are...

A.
Presence of floating-point co-processor
B.
Speed of operation
C.
Presence of 8 K cache on chip, presence of memory controller
D.
All of the above

Question 40

In virtual memory system, the addresses used by the programmer belongs to

A.
Memory space
B.
Physical addresses
C.
Address space
D.
Main memory address

Question 41

The method for updating the main memory as soon as word is removed from the cache is called

A.
Write-through
B.
Write-back
C.
Protected-write
D.
Cache write

Question 42

Which is true for a typical RISC architecture?

A.
Micro programmed control unit
B.
Instruction takes multiple cycles
C.
Have fewer register in CPU
D.
Emphasis on optimizing instruction pipelines.

Question 43

After reset, CPU begins execution of instruction from memory address

A.
0101H
B.
8000H
C.
0000H
D.
FFFFH

Question 44

In 8085 microprocessors how many I/O devices can be interfaced in I/O mapped I/O technique?

A.
Either 256 input devices or 256 output devices.
B.
256 I/O devices.
C.
256 input devices & 256 output devices.
D.
512 input-output devices.

Question 45

DMA interface unit eliminates the need to use CPU registers to transfer data from

A.
MAR to MBR
B.
I/O units to memory
C.
MBR to MAR
D.
Memory to I/O units

Question 46

How many 128 x 8 RAM chips are needed to provide a memory capacity of 2048 bytes?

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

Question 47

What is the bit storage capacity of a ROM with a 512 x 4-organization?

A.
2049
B.
2048
C.
2047
D.
2046

Question 48

How many different addresses are required by the memories that contain 16K words?

A.
16,380
B.
16,382
C.
16,384
D.
16,386

Question 49

The content of a 4-bit register is initially 1101. The register is shifted 2 times to the right with the serial input being 1011101. What is the content of the register after each shift?

A.
1110,0111
B.
0001,1000
C.
1101,1011
D.
1001,1001

Question 50

ABCD - seven segment decoder / driver in connected to an LED display. Which segments are illuminated for the input code DCBA = 0001?

A.
b,c
B.
c,b
C.
a,b,c
D.
a,b,c,d

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