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TMA: TMA1/CIT722

Matric Number: NOU120342066

CIT722 - Computer Networks

Dr Oyebanji Omotayo ([email protected] )

1 What is the technology solution used to connect multiple terminals to a single cable?

duplexing

multiplexing

full duplexing

none of the above

2 A computer network is basically established by the --- layer in the Open Systems Infrastructure model, popularly known asthe OSI model

network

application

session

data link

3 Which of the following is not a reason to use fiber-optic cables for point to point data transmission?

Need to assure data security

Avoidance of ground loops

Elimination of spark hazards

Data-transfer rates too low to use metal cables

4 What is networking?

the concept of sharing resources and services

the concept of sharing only resources

the concept of sharing only services

the concept of getting resources and services

5 All of the user computers connected to a network are called ---

terminals

workstations

ports

pathway

6 The repeater electrically --- the signal it receives and rebroadcasts it

amplifies

increases

decreases

enlarges

7 A --- is a device that allows you to segment a large network into two smaller, more efficient networks

repeater

switch

bridge

hub

8 A --- translates information from one network to another

switch

hub

repeater

router

Quiz Question http://tma.noun.edu.ng/DisplayQuiz.aspx?tmaid=TMA1/CIT722&Matric...

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9 The two major types of network operating systems are: Peer-to-Peer and ---

peer-to-client

Client Server

server-to-client

server-to-peer

10 Client/server network operating systems allow the network to centralize functions and applications in one or more dedicated---

file servers

workstations

PCs

terminals

11 What is network topology?

refers to the way a network is laid out only physically

refers to the way a network is laid out only logically

refers to the way a network is laid out

refers to the way a network is laid out either physically or logically

12 A linear bus topology consists of a main run of cable with a --- at each end

terminator

concentrator

switch

hub

13 Tree topologies are comprised of the multiple star topologies on a ---

star

bus

ring

token

14 Which method allows large number of independent, selectable channels to exist on a single fiber?

Frequency Division Multiplexing

Time Division Multiplexing

Analogue Modulation

Phase Modulation

15 Which of the following statements about interconnection networks is true?

The number of channels on a single fiber that can transmit data simultaneously refers to the degree of simultaneity

Diameter is the number of links in the largest path between any two

Degree is the number of channels on a single fiber

Point-to-point communication connections are called switches

16 What is the key disadvantage of a physically direct-wired LAN?

Fault detection and isolation are very difficult in a large direct-wired LAN

detection and isolation are very difficult in a large direct-wired LAN

Fault detection and isolation are very difficult in a large LAN

Fault detection only is very difficult in a large direct-wired LAN

17 Telephone systems may be classified as

duplex and symmetrical

duplex and etrical

simplex and symmetrical

simplex and asymmetrical

18 A network that provides a constant bandwidth for the complete duration of a message transfer is a

cell switched network

circuit switched network

packet switched network


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frame switched network

19 What does a router do?

forwards a packet to all outgoing links

determines on which outgoing link a packet is to be forwarded

forwards a packet to all outgoing links except the link upon which the packet originated

forwards a packet to the next free outgoing

20 Internet employs --- routing

star

ring

mesh

bus


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TMA: TMA2/CIT722




1 The way a network is laid out either physically or logically is ---

network diagram

network topology

network schema

network state

2 There are --- basic topologies

two

three

four

five

3 One of the advantages of star topology is

Requires more cable length than a linear topology

If the hub or concentrator fails nodes attached are disabled

More expensive than linear bus topologies because of the cost of the concentrators

Easy to install and wire

4 The important part of the network design theory is ---

knowledge

accuracy

topologies

adequacy

5 … is a topology

List

Map

Mesh

Bi-map

6 Network protocol is

a set of semantics that governs the communications between computers on a network

a set of rules that governs the communications between computers on a network

a set of syntax that governs the communications between computers on a network

a set of rules that governs the definitions between computers on a network

7 Syntax ---

refers to the structure or format of the data

refers to the meaning of the data

refers to the semantics of the data

refers to the meaning of the network

8 Semantics of the protocol ---

refers to the format of data

refers to structure of data

refers to layout of data

refers to the meaning of each section of bits

9 The key elements of a protocol are syntax, semantics and


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clock

timing

speed

accuracy

10 Protocol stacks are ---

the combination of the different protocols

the connection of the different protocols

the arrangement of the different protocols

the stacking of the different protocols

11 … computer plays a centralized role in a client/server model

Server

Client

Master

Slave

12 What do we call the computers that don't play centralized role in a client/server model?

Clients

Slaves

Auxilliaries

Tempos

13 In a peer to peer network all computers acts as a

server

client

master

member

14 SMTP ---

is a protocol

is a protocol that is used to send the email messages between the servers

is a protocol that is used to send the email messages

is a protocol that is used to send the between the servers

15 ATM is short for

Asynchronous Transfer Mode

Asynchronous Transfer Mechanism

Asynchronous Tropical Mode

Asynchronous Typical Mode

16 … is the interference between two signals

Jam

Jamming

Collision

Confusion

17 … is a well-known and widely used network technology that employs bus topology

IP

Ethernet

Bus

Token

18 All computers attached to an Ethernet participate in a distributed coordination scheme called

CSAM

CSMA

SAMC

CAMS


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19 SNMP is used for

managing the network attached devices of the complex network

managing the devices

managing the devices of only client/server

all of the options

20 FDDI stands for

Fiber distributed data integration

Fiber distribution data interface

Fiber distributed diagramatic interface

Fiber distributed data interface


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1 There are --- groups in the OSI layers

two

three

four

five

2 What is OSI?

An international model

An abstract model of how network protocols and equipment should communicate and work together

An abstract model of how network protocols

An abstract model of how equipment should communicate and work together

3 There are --- layers in OSI model

four

five

six

seven

4 The --- layer is concerned with controlling the operation of the subnet

session

application

network

data link

5 The layers in the OSI model are ordered ---

from highest to lowest

from lowest to highest

from middle downward

from bottom upward

6 The OSI model was designed to ensure different types of equipment (such as network adapters, hubs, and routers) would allbe compatible even if built by different ---

countries

states

manufacturers

regions

7 Together, the OSI layers comprise the --- stack

OSI

network

session

OIS

8 At each layer of the OSI Model, some information — for example, a format specification or a---—is added to the original data

network address

network format

network model

network design


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9 OSI model ---

simplifies networking

simplifies how network protocols are designed

simplifies how network names are designed

simplifies how network protocols are known

10 Token ring technology was developed by ---

ICL

DELL

COMPAQ

IBM

11 The primary function of protocols at the Network layer ---

is to translate network addresses into their physical counterparts

is to translate network names into their physical counterparts

is to translate network addresses into their counterparts

is to place network addresses into their physical counterparts

12 Protocols in the --- accept data from the Session layer

Transport layer

Presentation layer

Application layer

Network layer

13 Application layer ---

separates into protocol data units (PDUs)

separates into data units (DUs)

separates data into protocol data units (PDUs)

separates activities into protocol data units (PDUs)

14 What is a frame?

structured package for moving data

structured package

package for moving data

structured package for moving activities

15 TCP/IP Reference Model was brought about by the ---

ability to connect networks together

ability to connect multiple networks together in a seamless way

ability to connect multiple networks together anyhow

ability to design multiple networks together in a seamless way

16 The second protocol in Internet layer is ---

UPD

PUD

UDP

UPC

17 what is NNTP?

The protocol used for moving activities around

The protocol used for moving news articles around

The semantics used for moving news articles around

The protocol used for moving news articles in a place

18 Application layer is the --- layer of four layer TCP/IP model

bottommost

topmost

middle

last


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19 TCP/IP model has --- that are defined and described in Request for Comment (RFC) documents

rules

comments

information

standards

20 IP addresses are made hierarchical ---

to reduce the size of routing tables by having routing tables only handle forwarding from network backward

to reduce the size of routing tables by having routing tables only handle forwarding

to reduce the size of routing tables by having tables only handle forwarding from network to network

to reduce the size of routing tables by having routing tables only handle forwarding from network to network


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TMA: TMA4/CIT722




1 X.25 is ---

an analog packet-switched technology designed for long-distance data transmission

a digital packet-switched technology designed for long-distance data transmission

an analog packet-switched technology designed for short-distance data transmission

a digital packet-switched technology designed for short-distance data transmission

2 Frame relay is ---

an updated digital version of X.25

an updated analog version of X.25

an updated digital version

an updated digital version of packet switching

3 Wireless LANs use high frequency radio signals, infrared light beams, or lasers to communicate between the workstations andthe --- or hubs

PCs

signals

mesh

file servers

4 The two most common types of infrared communications used in schools are ---

line-of-sight and scattered broadcast

line-of-sight and broadcast

line-of-point and scattered broadcast

line-of-sight and scattered addressing

5 What is a disadvantage of Wireless LANs?

good security

bad environment

poor environment

poor security

6 … media can be used in LANs

Strong

Available

Wireless

Thick

7 Ethernet Addressing uses ---

PAC address

PAN address

MAC address

PBC address

8 The form of an IP address in IPv4 is ---

aaa.bbb.ccc

aaa.bbb.ccc.mmm

aaa.ccc.mmm

bbb.ccc.mmm


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9 NIC stands for

Network Interface Card

Network Interface Cord

Network Intel Card

Network Intel Cord

10 How many bytes do Ethernet frame has?

6

7

8

9

11 There are two IP addressing schemes: --- and private

secret

general

common

hierarchical

12 An IP address consists of --- bits of information

8

16

24

32

13 Common LAN topologies include ---, tree, star, and ring

bus

circle

hierarchical

cube

14 Key LAN components are computers, ---, NICs, hubs, and cables

PCs

machines

NOS

testers

15 LANs are designed ---

to operate within unlimited geographic area

to operate within a limited geography

to incorporate within a limited geographic area

to operate within a limited geographic area

16 A LAN is owned, operated, and used by a --- organization

different

same

single

non

17 MANs (Metropolitan Area Networks) are --- versions of LANs

smaller

same

larger

different

18 WANs are usually --- networks

peer-to-peer

peer-to-point

point-to-peer

point-to-point


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19 A dial-up connection ---

is one in which a user connects via a modem to a distant network from a computer and stays connected

is one in which a user connects via a modem to a distant network from a computer and stays connected for a finite periodof time

is one in which a user connects via a modem to a distant network from a computer and connected for a finite time

is one in which a user connects via a PC to a distant network from a computer and stays connected for a finite period oftime

20 DQDB is short for

Distributed Queue Dual Bit

Distributed Queue Dual Byte

Distributed Queue Dual Bingo

Distributed Queue Dual Bus


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TMA: TMA1/CIT736


CIT736 - Computer Programming

MR ONWORDI GREGORY ([email protected] )

1 Which of the following errors causes 1/3 to be stored as 0.3 instead of 0.333333333?

Conversion error

Syntax error

Round-off error

Run-time error

2 Errors due to misspelled statements are called which of the following?

Conversion error

Syntax error

Round-off error

Run-time error

3 Division by 0 results in which of the following errors?

Conversion error

Syntax error

Round-off error

Run-time error

4 The decimal 16 in binary is which of the following?

100

1100

10000

10101

5 The use of which of the following can speed up special kinds of calculations?

Lookup tables

Symbol tables

Hash tables

None of the above

6 A subprogram which is placed inside a module procedure is called which of the following?

External procedure

Internal procedure

Module

Submodule

7 In FORTRAN, which of the following is used to define the procedure argument details, and must always be used for externalprocedures?

Subclass

Subprocess

Interface

Interface block

8 Which field descriptor is used to skip fields in the FORMAT statement?

I

A

X

H


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9 Which field descriptor is used to indicate starting columns to read data in the FORMAT statement?

I

T

X

H

10 In FORTRAN, to restart file reading at the beginning, which of the following is used?

SEEK

REWIND

RESTART

LOOKUP

11 Which of the following is NOT a valid FORTRAN CASE expression data type?

INTEGER

LOGICAL

CHARACTER

COMPLEX

12 The first element of an array X in FORTRAN is which of the following?

X(0)

X(1)

X[0]

X[1]

13 Which Pascal keyword is used to define constants?

CONST

CONSTANT

CONSTANTS

None of the above

14 Which Pascal keyword is used to mark the end of a program?

End

End.

Stop

Stop.

15 Which programming method splits programs into areas or modules that perform specific tasks?

System programming

Modular programming

Line programming

None of the above

16 Pascal was developed by whom?

Blaise Pascal

Nicklaus Wirth

Bjarne Stroustrop

Dennis Ritchie

17 Which of the following can return only a single value?

FUNCTION

SUBROUTINE

ARRAY

None of the above

18 In FORTRAN, which of the following is used to mark comments?

?

#

!

*


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19 The second element of an array X in FORTRAN is which of the following?

X(2)

X(1)

X[2]

x(1)

20 Which of the following is not a FORTRAN data type?

ARRAY

REAL

LOGICAL

COMPLEX


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TMA: TMA2/CIT736




1 Checking for correctness of an algorithm using a pen-and-paper walkthrough is called which of the following?

Desk checking

Testing

Simulation

Modelling

2 Which of the following is a terminator and marks the beginning and end of the flow in a flowchart?

Parallelogram

Rectangle

Oval

Square

3 Which of the following is used to represent input and output in a flowchart?

Parallelogram

Rectangle

Oval

Square

4 Which of the following is used to represent processes in a flowchart?

Parallelogram

Rectangle

Oval

Square

5 Which of the following is a step-by-step description of a process written in pseudocode?

Algorithm

Flowchart

Control of flow

None of the above

6 Which of the following is a graphical depiction of a program’s flow?

Algorithm

Flowchart

Control of flow

None of the above

7 The decimal 9 in binary is which of the following?

1000

1001

1010

1011

8 Which of the following errors occurs when the compiler cannot recognize one or more statements that you have written?

Run-time

Syntax

Semantic

None of the above

9 In OOP, Objects communicate with each other by passing which of the following?


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Functions

Methods

Classes

Messages

10 In USE statements, which clause is used to document explicitly all entities which are actually accessed from that module?

CALL

CASE

ONLY

INTERFACE

11 What is the maximum decimal number that can be represented with 5 bits?

15

31

32

63

12 Which of the following is not a valid index for the FORTRAN array defined by the statement: INTEGER, DIMENSION(1:3,1:4):: b

b(3,4)

b(4,3)

b(3,3)

b(2,4)

13 Which of the following is NOT a reserved word in PASCAL?

Textbackground

Clrscr

Halt

None of the above

14 Which of the following is the assignment operator in PASCAL?

=

.=

:=

;=

15 The binary number 1100 is which of the following in decimal?

10

11

12

13

16 Which of the following forces a program to stop anywhere it is set during debugging?

Empty constant

Empty variable

Tracker

Breakpoint

17 Which activity includes stepping into any function or procedure that the code calls and working through it line by line?

Step Over

Step Out

Step Into

None of the above

18 Which activitvity allows you to jump to the end of the procedure or function that you are currently in and to move to theline of code after the line that called the procedure?

Step Over

Step Out

Step Into

None of the above


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19 Which activity allows you to but it enables you to pass straight over the procedures and functions?

Step Over

Step Out

Step Into

None of the above

20 Dividing a number by 0 is an example of which of the following errors?

Run-time

Syntax

Semantic

Design-time


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1 What is the value of the calculation (1/2)*(3.0+5.0)?

4

3

1

0

2 The Higher level language is _________oriented rather than machine oriented

problem

procedure

structural

class

3 The general form of the declaration statement in Fortran 90/95 is

type [ [, attribute ] ... :: ] entity list

type [ [, attribute ] ] entity list

type [ [, attribute ] ... ]

type [ [, attribute entity list ] ]

4 The attribute is one of the following except

PARAMETER

POINTER

ALLOCATABLE

EXTRINSIC

5 The format of the common statement is______

common arrange

common add

Common sub

Common list

6 Procedures may be subroutines or _____________

functions

sub-tasks

arrays

task

7 A major new Fortran 90/95 feature is a new type of program unit called the module

TRUE

FALSE

not sure

none of the options

8 Subprograms fall into two basic categories:___________ and subroutines

Arrays

reads

functions

none of the options

9 The Fortran source codes are translated into machine language during____________


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computation

compilation

writing

execution

10 In the main program, the____________is called using the CALL command

LIBRARY

FUNCTION

SUBROUTINE

ARGUMENTS

11 2**4 is equal to

2

4

8

16

12 Example of a flowcharting tool is_____________

Microsoft Word

Microsoft Visio

Microsoft Excel

Microsoft Powerpoint

13 4**4 is equal to

16

64

128

256

14 The command ** is used to____________

raise to a power

raise to power two

raise to power three

double the power

15 The SUBROUTINE subprogram mirrors the syntax of a main program in having its own ________ statement, and its ownvariable declarations.

IMPLICIT NOTE

EXPLICIT NONE

IMPLICIT NONE

NONE OF THE OPTIONS

16 REAL variables can hold integer values, but not vice versa

TRUE

FALSE

not sure

none of the options

17 The following compilers can be used to compile and execute a Fortran 90/95 programs except

NAGware Fortran 90 compiler

Lathey’s Fortran 90 compiler

90 compiler assembly

Microsoft Developer Studio (MS-DEV) Tool

18 The CALL ___________ is called a "pseudo-random" number generator

RANDOM

RANDOM_NUMBER

RANDOM_STRING

NONE OF THE OPTIONS


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19 The __________ is important for both sharing data and sharing procedures between program units

model

modelling

module

mode

20 ________tables are a simple programming trick to speed a special kind of calculations.

Lookup

makeup

Access

setup


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1 User-defined Function is a complete block of statements usually located after the________statement in a program

Beginning

End

function

main body

2 The Higher level language is _________oriented rather than machine oriented

procedure

problem

structural

class

3 in fortran programming language, Subprograms fall into how many basic categories?

4

3

2

5

4 Example of two dimensional array of numbers is a__________

matrix

patrix

Table

none of the options

5 Pascal is a high-level language developed in the early 1970s by________

Blaise Pascal

thomas eddison

michael faraday

Niklaus Wirth

6 A control structure alters the sequential flow of the logic in a program by using_________instructions

branching

skewing

running

none of the options

7 Fortran permits an array to have up to_______ subscripts, each of which relates to one dimension of the array

5

7

9

11

8 The instructions in, Machine language, are usually represented by___________

decimal

Hexadecimal

binary numbers

octal

9 In the DO loop, the value of i starts at 1 and increases in steps of 1 to a maximum value of n


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TRUE

FALSE

not sure

none of the options

10 the numerical input and output routine in Pascal ________ in external data and prints out data

collects

processes

reads

prints

11 The general form of PRINT syntax is_________

PRINT, output list

PRINT *, output list

PRINT *, output.

PRINT *, input list

12 A Command Language (CL) identifies the user to the system

TRUE

FALSE

not sure

none of the options

13 The following are the field descriptors that are used along with the FORMAT statements except

I

E

A

P

14 Fortran 90/95 allows an extended form of__________ in which all the attributes of a particular entity may be declaredtogether

declaration

Procedure

program

none of the options

15 The syntax for using the field descriptors for Exponential is ________

wEw.d

nEw.

nEw.d

nlw.E

16 A ___________is a special program which translates programs written in high-level language into machine language.

Symbolic codes

Assembler

compiler

High Level Language

17 ____________tables are a simple programming trick to speed a special kind of calculations

Lookup

NSFT

FAT

FAT32

18 An________block is used to define the procedure argument details

Interface

attributes

declaration

replacement


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19 The syntax for using the field descriptors for Integer is__________

nIw.d

nIw

nIwE

nIw.E

20 The IMPLICIT statement has been extended to include the parameter________

2

5

10

none of the options


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CIT752 - Operating System Concepts

MS AFOLORUNSHO RELE ([email protected] )

1 Which of the following is a reason for a parent process to terminate a child process?

The parent is exiting

The child has exceeded its usage of some of the resources that it has been allocated

The task assigned to the child is no longer required

All of the above

2 To indicate its completion, _________ jobs should include Halt instructions

batch

interactive

time-sharing

real-time

3 Which of the following is not a reason for allowing process cooperation?

Computation speedup

Modularity

Convenience

None of the above

4 Which of the following is an issue in Cooperating Processes?

Race condition

Critical regions

Mutual exclusion

All of the above

5 The services offered by the OS are accessed by the users through __________

GUIs

CLIs

APIs

GUIs and CLIs

6 The operating system acts as a host for ___________ on the machine

users

software

application

hardware

7 Some of the oldest models of computers use __________ operating system

network

encompassing

multi-user

embedded

8 System calls provide an interface between a _________ and the operating system

program

code

software

process

9 For I/O, a process involves a _________ call telling the operating system to read from or to write to particular area


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wait

system

signal

none of the above

10 A process is an 'active' entity while a __________ is a 'passive' entity

thread

program

software

data

11 A _______ is an algorithm expressed in some suitable notation

process

thread

rope

program

12 Context Switching can be time-dependent on ________ support

software

humanware

hardware

firmware

13 A child process at the termination point may return a status value to its parent process via the _______ system call

halt()

exit()

wait()

none of the above

14 The services offered by the OS are accessed by the applications through __________

GUIs

CLIs

APIs

GUIs and CLIs

15 On large multi-user systems like Unix, the user interface is generally implemented as an _________ program that runsoutside the operating system

system

application

user

machine

16 Which of the following is an example of Single-user operating systems?

Windows NT

Windows 3.11

Windows 3.1

Windows 2003

17 _________ simplifies the use of the hardware for the user

operating system

application programs

software

firmware

18 The ________ is the heart of the operating system

core

shell

kernel

interface


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19 Graphical User Interface (GUI) is user-friendly desktop ______ interface

semaphore

metaphoric

metaphor

synchronized

20 _______ has “Aqua” GUI interface with UNIX kernel underneath and shells

Mac OS X

Microsoft Windows

MS-DOS

PC-DOS


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1 Which of the following properties is possessed by a communication link in direct communication scheme?

exactly one link exists between each pair of processes

a link is established automatically between every pair of processes that want to communicate

a link is associated with exactly two processes

all of the above

2 The V operation of a semaphore behaves exactly like the signal operation of a monitor

TRUE

False

it depends

none of the above

3 An assembler producing object modules that are consumed by a loader is an example of a ______

monitor

semaphore

critical region

mutual exclusion

4 Which of the following is a non-preemptive scheme?

SJF

Priority scheduling

FCFS

RR

5 The _____ algorithm ensures that short execution requests will finish before long execution requests

SJF

Priority scheduling

FCFS

RR

6 Highest Response Ratio Next (HRRN) scheme is derived from the _____ method

SJF

Priority scheduling

FCFS

RR

7 There are _______ types of scheduling policies

three

four

five

several

8 A ___________ is a single integer variable which can take non negative value and upon which two operations, called waitand signal, are defined

monitor

semaphore

critical region

mutual exclusion


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9 _______ provide a structured concurrent programming primitive, which is used by processes to ensure exclusive access toresources, and for synchronizing and communicating among users

monitors

semaphores

critical regions

mutex

10 The atomic operations on a semaphore are __________

wait & signal

down & up

low & high

none of the above

11 Limited modularity of the resulting process definitions is a disadvantage of ___________ communication

indirect

blocking

direct

synchronous

12 Initializing a semaphore to 1 creates a mutual exclusion (mutex) semaphore

monitor

critical region

mutual exclusion

none of the above

13 There are ____ necessary conditions for deadlock to occur

two

three

four

five

14 How many call to a monitor procedure can be active at a time?

one

two

three

several

15 Initializing a semaphore to __________ can be used for resource allocation and synchronization

0

1

2

other values

16 There are _________ way(s) to achieve mutual exclusion

one

four

six

several

17 The decision to add to the pool of processes to be executed is _______ scheduling

short-term

medium-term

long-term

none of the above

18 Another name for short-term scheduling is _________ scheduling

I/O

low-level

high-level


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basic

19 For a uniprocessor system, there will always be ________ number of running process at any given time

one

two

three

several

20 A CPU-bound process generates I/O requests _________

frequently

infrequently

incessantly

it depends


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1 Termination of a process, terminates _________ thread(s) within the process

one

all

some

all of the above

2 ________ provide a structured concurrent programming primitive, which is used by processes to ensure exclusive access toresources, and for synchronizing and communicating among users

Monitors

VDUs

Screens

All of the above

3 Initializing a semaphore to _________ creates a mutual exclusion (mutex) semaphore

0

1

2

none of the above

4 The file system consists of _________ distinct parts

two

three

four

none of the above

5 Which of the following is an example of Single-user operating systems?

Windows NT

Windows 3.11

Windows 3.1

Windows 2003

6 >__________ simplifies the use of the hardware for the user

operating system

application programs

software

firmware

7 The ________ is the heart of the operating system

core

shell

kernel

interface

8 The CPU makes use of ________internal registers in order to exchange data with memory

two

three

four

none of the above


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9 _______ has “Aqua” GUI interface with UNIX kernel underneath and shells

Mac OS X

Microsoft Windows

MS-DOS

PC-DOS

10 System calls provide an interface between a _________ and the operating system

program

code

software

process

11 For I/O, a process involves a _________ call telling the operating system to read from or to write to particular area

wait

system

execution

none of the above

12 A process is an 'active' entity while a __________ is a 'passive' entity

thread

software

program

data

13 For most users, the __________ system is the most visible aspect of an operating system

process management

data

synchronization

file

14 Context Switching can be time-dependent on ________ support

software

humanware

hardware

firmware

15 A child process at the termination point may return a status value to its parent process via the _______ system call

halt()

exit()

wait()

none of the above

16 Which of the following is a reason for a parent process to terminate a child process?

The child has exceeded its usage of some of the resources that it has been allocated

The task assigned to the child is no longer required

The parent is exiting

All of the above

17 Which of the following statement is false?

A monitor solution is more structured than the one with semaphores

The V operation of a semaphore behaves exactly like the signal operation of a monitor

In monitors data and procedures are encapsulated in a single module

None of the above

18 Which of the following is not a reason for allowing process cooperation?

Computation speedup

Modularity

Convenience

None of the above


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19 _____atomic operations are supported on a semaphore

Two

Three

Four

None of the above

20 The condition variable for a monitor is exactly of the same type as that of a _________

race condition

mutual exclusion

semaphore

none of the above


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1 Which of the following is does the CPU make use of in order to exchange data with memory?

memory buffer register (MBR)

I/O address register (I/OAR)

I/O buffer register (I/OBR)

All of the above

2 Which of the following is capable of taking over control of the system from the CPU?

Direct Memory Access

Register Address Memory

Indirect Memory Access

None of the above

3 The I/O transfer rate being limited by the speed with which the CPU can test and service a device is a drawback of_________

programmed I/O

Interrupt-Driven I/O

All of the above

None of the above

4 There are _______techniques used for I/O operations

two

three

four

none of the above

5 > Which of the following can result in the overall performance of the system dropping to the speed of a lower level in thememory hierarchy?

thrashing

deadlock

livelock

none of the above

6 There are _________ way(s) to achieve mutual exclusion

one

four

six

several

7 The decision to add to the pool of processes to be executed is _______ scheduling

short-term

medium-term

long-term

none of the above

8 Being amenable to full statistical analysis is an advantage of which of the following?

not recently used (NRU

least recently used (LRU)

not frequently used

first come first served (FCFS)


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9 In the context of page replacement for single process, the not recently used (NRU) algorithm divides pages into ________classes depending on the state of the R and M bits

two

four

six

several

10 Which of the following page replacement algorithms cannot be implemented without special hardware

not recently used (NRU

least recently used (LRU)

not frequently used

first come first served (FCFS)

11 A ___________ is a single integer variable which can take non negative value and upon which two operations, called waitand signal, are defined

monitor

critical region

semaphore

mutual exclusion

12 ________ provide a structured concurrent programming primitive, which is used by processes to ensure exclusive access toresources, and for synchronizing and communicating among users

monitor

critical region

semaphore

mutex

13 The atomic operations on a semaphore are __________

wait & signal

down & up

low & high

none of the above

14 Limited modularity of the resulting process definitions is a disadvantage of ___________ communication

direct

indirect

blocking

synchronous

15 Initializing a semaphore to 1 creates a mutual exclusion (mutex) semaphore

monitor

critical region

mutual exclusion

none of the above

16 There are ____ necessary conditions for deadlock to occur

two

four

five

six

17 Initializing a semaphore to __________ can be used for synchronization

one

two

three

several

18 Initializing a semaphore to __________ can be used for synchronization

0

1


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2

other values

19 How many primary cause of thrashing do we have?

one

two

three

several

20 The causes of thrashing can be attributed to which of the following?

Increase in the degree of multi-programming

The program does not exhibit locality of reference

Insufficient memory at a particular point of time

All of the above


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CIT756 - Operations Research

Eng. Oguntala George ([email protected] )

1 What do you understand by Operations Research?

A scientific approach to the analysis and solution of management problem

A scientific approach to the analysis of problems

A scientific solution of management problem

None of the options

2 OR utilizes interdisciplinary mixed-team approach to solving --- problems

scientific

historical

management

real

3 OR is science-based by --- and adapting the scientific approach in analyzing operational decision problems

deed

guess

way

adoption

4 What does problem definition in Operations Research involve?

The development of the problem at hand

The development of a clear and concise statement of the problem at hand

The development of a rough statement of the problem at hand

None of the options

5 … is one of the stages of Operations Research

Writing

Model construction

Previewing

None of the options

6 Which is one of the roles of Operations Research in business?

Improving the day-to-day efficiency of a company’s operation

Improving the day-to-day of a company’s operation

Improving the day-to-day profit of a company’s operation

Improving the day-to-day efficiency of a company

7 One of the business areas where Operations Research is applicable:

payroll

salary

product mix

none of the options

8 In OR, it is often difficult to balance the requirement of reality and those of ---

practicability

experimentation

simplicity

none of the options

9 One of the limitations of Operations Research:


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The quality of data collection may be poor and/or inaccurate

The quality of data collection may be somehow

The quality of collection may be poor and/or inaccurate

None of the options

10 Operations research uses the computer for ---

thinking

problem solving

problem identification

problem definition

11 Interpretation of the Results/Establishment of Controls of OR involves:

determining the implication to the system

determining the solutions to the system

identifying the implication of the solutions to the system

determining the implication of the solutions to the system

12 Developing a solution in OR involves:

manipulation of the model to arrive at the best (optimal) solution to the problem

manipulation of the model to arrive at a solution to the problem

manipulation of the model to arrive at the real solution to the problem

none of the options

13 It was the first --- Revolution which contributed mainly towards the development of OR

Scientific

Mechanized

Industrial

None of the options

14 OR helps to --- new problems as one problem is being solved

execute

design

discover

none of the options

15 The distinctive approach of OR is facts-finding and ---

designing

modelling

grafting

graphing

16 Operations Research is most fundamentally

processing-based

engineering-based

science-based

none of the options

17 Problems in OR may have a --- nature as in linear programming or have a logical structure as in simulation and algorithms

functional

linear

bilinear

none of the options

18 What does data collection involve?

Obtaining quantitative data either from existing records or a new survey

Obtaining qualitative data either from existing records or a new survey

Obtaining quantitative data either from old survey or a new survey

none of the options


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19 Testing the model and its solution involves:

determining the accuracy only of the data used in the model

determining only the completeness of the data used in the model

determining the accuracy or the uniqueness of the data used in the model

determining the accuracy or the completeness of the data used in the model

20 Operations Research helps in determining the --- requirements that enable the best decisions to be made, subject to costconstraints and to formulation of rules or procedures for making these operating decisions

OR

information

system

none of the options


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1 What do you understand by modeling in OR?

A way of representing the behaviour of a situation to enable us deduce what is best to do about the system

A way of representing the behaviour of a situation to enable us locate what is best to do about the system

A way of representing the behaviour of a situation to enable us deduce what it is

None of the options

2 A major merit in modelling is that knowledge gained about a model framework can be used in understanding,communicating, and/or --- about other situation that can be modelled using the same framework

designing

executing

proposing

reasoning

3 Which is the most important type of model?

Simulation

Iconic

Symbolic or Mathematical

None of the options

4 … modeling focuses on creating a mathematical representation of management problems in organizations

Iconic

Simulation

Mathematical

None of the options

5 What do we use simulation models for?

Mathematical problems

For solving such problems that cannot be solved mathematically

Business problems

None of the options

6 The critical path method uses a --- network model in which the durations of the activities are assumed to be known forcertain

deterministic

probabilistic

non deterministic

none of the options

7 The program evaluation and review technique uses a model that incorporates some --- distribution of the durations

realistic

certain

probability

none of the options

8 A mathematical model is normally put in the form of relationships between the --- variables

qualitative

quantitative

real

actual


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9 How do you construct a model?

You need to observe real world problem and make assumptions about influencing factors

You need to discuss real world problem and make assumptions about influencing factors

You need to observe real world problem and make guesses about influencing factors

None of the options

10 What is linear programming?

A mathematical technique designed to help managers in planning and decision making relative to resource allocations

A simulation technique designed to help managers in planning and decision making relative to resource allocations

A good technique designed to help managers in planning and decision making relative to resource allocations

None of the options

11 All linear programming models have --- basic properties in common

two

three

four

five

12 Objectives and constraints in LP model must be expressed in linear equations and ---

equalities

inequalities

quadratic

none of the options

13 One of the assumptions of Linear Programming is ---

negativity

proportionality

equality

none of the options

14 What are linear programming problems?

Optimization problems which are stated verbally or in words

Problems which are stated verbally or in words

Simulation problems which are stated verbally or in words

None of the options

15 To solve a linear programming model using the graphical method, we shall turn each constraints inequality to ---

equality

equation

logic

none of the options

16 Linear programming problems do not always yield a unique --- solution

location

real

actual

optimal

17 What is simplex method?

An algebraic procedure in which a series of repetitive operation are used and we progressively approach the optimalsolution

An algebraic procedure in which a series of repetitive operation are used and we progressively approach the suboptimalsolution

An algebraic procedure in which a series of repetitive operation are used and we decreasingly approach the optimalsolution

None of the options

18 In the simplex method, the process of determining the main variable that can be included or the non basic variable that canbe excluded is known as “change of ---”


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direction

problem

equation

basis

19 In standard linear programming models, for maximization problems. We use the “ less than or equal to sign”, while forminimization problem we use the “greater than or --- to sign”

plus

minus

equal

not equal

20 Model construction is one of the stages of …

OR

simulation

system

none of the options


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1 The two integer programming methods available are: Cutting Plane Method and ---

look method

find method

search method

none of the options

2 The --- order quantity is a basic deterministic model that enables one to determine the optimal order quantity that willminimize the costs of managing the inventory system

Best

Wise

Economic

None of the options

3 What is dynamic programming?

A quantitative technique

A quantitative technique which convert one small problem having two decision variables into a sequence of problem eachwith small number of decisions variables

A quantitative technique which convert one big/large problem having many decision variables into a sequence of problemeach with small number decisions variables

None of the options

4 In dynamic programming, when a large problem is developed into various sub-problems in a sequence, these are the --- ofthe original problem

steps

stages

units

pieces

5 … model is a powerful tool in the management of projects, particularly those consisting of large number of activities relatedin complex ways

Graphical

Network

Quantitative

Qualitative

6 … programming does not involve any mathematical computation like of which are done in Simplex method

Linear

Dynamic

System

None of the options

7 Cutting-Plane Algorithm was developed by RE Gomory for --- integer problems as also for mixed integer problems

applied

real

floating

pure

8 … Integer Linear Programming – if some of the variables are restricted to have only integer values while others could havefractional values as the case may be in real life applications of the problem

Pure

Real


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Mixed

Applied

9 In standard linear programming models, for maximization problems we use the “ --- than or equal to sign”

less

greater

more

none of the options

10 Graphical method can only be use to solve a linear programming model involving two --- variables

mixed

decision

linear

dynamic

11 Additivity means that the --- of all activities equals the sum of each individual activity

difference

total

grand

none of the options

12 All LP models seek to maximize or minimize some ---, usually profit or costs

quality

quantity

entity

none of the options

13 In any mathematical program, we seek a ---

suggestion

reason

solution

none of the options

14 Optimization problems most often are stated verbally. The solution procedure is to --- the problem with a mathematicalprogram

start

design

analyse

model

15 LPP stands for

Linear Programming Practice

Linear Programming Problem

Line Programming Problem

Linear Program Problem

16 … programming is an aspect of operations research that utilizes the construction of a mathematical model to solve allocationproblem

Dynamic

Linear

Simplex

None of the options

17 Determining optimal solution is step --- of formulation and solution of dynamic programming problems

two

three

four

five


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18 The purpose of all inventory models and techniques is to determine rationally how much to order and --- to order

when

how

where

place

19 The CPM is --- whiles PERT is probabilities in terms of time estimate

deterministic

certain

exact

none of the options

20 Inventory control can be done using quantitative techniques or --- method

graphical

qualitative

mathematical

None of the options


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1 A typical transportation problem involves a number of sources of supply (e.g. factory) and a number of --- (e.g. warehouses)

locations

addresses

beginnings

destinations

2 The two main methods that can be used to assign job to work centres are use of gantt chart and --- method

assignment

quantitative

qualitative

none of the options

3 What is the major requirement of transportation?

There must be a cost per unit

There must be a constant transportation cost per unit

There must be a constant transportation

None of the options

4 The general form of a transportation problem for 'm' sources and 'n' destination can be represented as:

linear programming model

line programming model

dynamic programming model

none of the options

5 What is a balanced transportation problem?

When the total supply from all sources exactly equal total demand at all destinations

When souces equal destinations

When the total supply from all sources exactly equal total all destinations

None of the options

6 Replacement decision analysis is a --- technique used to take decision as to when to replace an item that deteriorates or failsto function

graphical

addition

system

mathematical

7 What does the Least Cost Method of an initial feasible solution to transportation problem advocate?

Allocation should be based on maximum cost of transportation rule / criterion

Allocation should be based on minimum cost of transportation rule / criterionn

Allocation should be based on minimum of transportation rule / criterion

None of the options

8 Although, transportation problems are usually minimizing problems, on occasions, problems are framed so that the objectiveis to make the allocations from sources to destinations in a manner which --- contribution or profit

increases

decreases

maximizes

none of the options


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9 North-west Corner Method: The procedure is exactly the same as that of --- problem, because allocation is based ongeographical location

minimization

maximazation

digitalization

none of the options

10 Scheduling, which occurs in every organization, refers to establishing the --- of the use of equipment, facilities and humanactivities in an organisation and so it deal with the timing of operations

timing

best

least

none of the options

11 An important variation of the --- problem is the assignment problem

simulation

linear programming

dynamic programming

transportation

12 Two major replacement --- analysis are replacement of items that wear off gradually and replacement of items that failssuddenly

decision

idea

suggestion

None of the options

13 What is the first step in solving an assignment problem?

Develop an opportunity cost table or matrix associated with it

Only develop an opportunity cost table

Only develop matrix associated with it

None of the options

14 Another name for --- is waiting line

queue

destination

source

none of the options

15 SIRO means --- – in- random – order

sequence

send

system

service

16 … problem can be used to minimize cost when executing N jobs from N sources, assigned to N individuals at N locations

LP

Assignment

Dynamic

None of the options

17 In assignment problem, If we have unequal rows or columns we introduce --- row or column to balance up the problem

entity

relation

dummy

None of the options

18 Generally in assignment table, the rows will contain the objects or people we wish to assign and the columns comprise the--- or things we want them assigned to


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methods

designs

ideas

tasks

19 The solution procedure to assignment problems requires that the number of rows in the table --- the number of columns

greater than

equal

differ

less than

20 The complexity of operation varies under two situations, namely --- shop system and job shop system

drain

leak

flow

none of the options


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