CS101 Introduction to Computing Solve Paper December 2012-2013

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CS101 Introduction to Computing Solve Paper[SIZE=5] 2012-2013[/SIZE]


1
Short and long quizes
from past papers
CS101 Introduction to Computing
January 19, 2011
MC100401285 MOAZ SIDDIQ
FINALTERM EXAMINATION
Spring 2010
Question No: 27 ( Marks: 2 )
What is the difference between ‘single-line text input field’ and ‘password input field’ ?
ANS:-
A Password Field is good for sensitive information. The only item that is absolutely necessary is the Submit Button. It
is a good idea to include a Reset Button for the convenience of the user.
A text field gathers information using a single line of text. This field is useful for short answers. The default text field is
blank. If you want to specify default text, use the VALUE attribute. .
Question No: 28 ( Marks: 2 )
What is internet?
ANS:-
Internet is also called WAN, which means the interconnection of large number of computer networks and it
consists of millions of private, public, academic, business, and government networks of local to global scope that are
linked by a broad array of electronic and optical networking technologies.
Question No: 29 ( Marks: 2 )
In JavaScript, what is event handling? What are the two types of events?
ANS:-
Event handling means capturing an event and responding to that.
Events e.g. onMouseOver, OnClick, onLoad, Onunload, updating the clock etc. are captured by the Java script &
according to the programs they are responded accordingly
Question No: 32 ( Marks: 3 )
Differentiate between onLoad and onUnload
ANS:-
On load event is used when the page is load in the browser while on the other side onUnload event works when the
page closes down.
Question No: 33 ( Marks: 3 )
Elaborate Rester Graphics with examples.
ANS:-
Raster graphics are digital images created or captured (for example, by scanning in a photo) as a set of samples of a
given space . A raster file is usually larger than a vector graphics image file. A raster file is usually difficult to modify
without loss of information.
Examples of raster image file types are: BMP, TIFF, GIF, and JPEG files.
Question No: 34 ( Marks: 5 )
What is a Relational Database? Give the names of any three RDBMS software. (2+3)
2
ANS:-
Database architecture consists of three levels, external, conceptual and internal. Clearly separating the three levels
was a major feature of the relational database.
NAMES:
Oracle Database software, Linux, and oracle e business database software , and Oracle OLAP.
Question No: 36 ( Marks: 5 )
What do you mean by the term 'Telepresence' in Computing World?
ANS:-
Telepresence
• Being there, without physically being there!
• Two remotely located people, with the help of special equipment, immersed in a
simulated 3-D environment where they interact like they are sitting next to each other
• Chatting, a telephone conversation, or even a videoconference are examples, but in
a degraded sense of the idea
FINALTERM EXAMINATION
Spring 2010
Question No: 27 ( Marks: 2 )
What is a function? Give one example.
ANS:-
Function is a reusable code (group of statement) that is executed when the function is called. It is also known as subprogram.
Function is normally defined in the head section of the code.
Question No: 28 ( Marks: 2 )
What is an intelligent system?
ANS:-
Intelligent systems are the programs developed to perform complicated jobs that reflect human brain and thoughts. If
the algorithms are too much complex or can not be solved instantly then we can use such systems. Therefore the well
intelligent system not only performs well but it has the capability to rectify any errors by himself if it occurs within his
domain.
The examples of intelligent systems are Robotics, Business Intelligence …etc.
Question No: 29 ( Marks: 2 )
What is meant by semantic error ?
ANS:-
It is an error which a developer encounters when a statement is executed but it was not intended by him (the
developer). Such errors are very difficult to locate during testing. Mostly these occur during abnormal circumstances.
It may be referred as the logical error.
Question No: 30 ( Marks: 2 )
What is best algorithm?
ANS:-
Greedy algorithm is the best algorithm as it is n algorithm that always takes the best immediate, or local solution while
finding an answer.
Question No: 32 ( Marks: 3 )
What are the Sub categories of Artificial Intelligence? Briefly explain any two.
ANS:-
1. Robotics
3
These are the machines which are computer programmed and perform work which was previously done by humans.
They can be found in the manufacturing industry, the military, space exploration and medical applications.
2. Expert Systems
These systems are designed to replace an expert. The medical expert system is an example of such system which
can replace a Doctor/medical expert.
Question No: 33 ( Marks: 3 )
What are the steps of working of TCP and IP protocols in internet transmission?
ANS:-
TCP divide messages in to many packets (capsulation) and sent these messages over the internet and IP route these
messages on the internet to the correct destination and upon reaching the messages on its destination the messages
are encapsulated.
Question No: 34 ( Marks: 5 )
What is ARPANET and who developed it?
ANS:-
ARPANET stands for Advanced Research Projects. The initial purpose was to communicate with and share computer
resources among mainly scientific users at the connected institutions. In the beginning it was connected four
universities and enabled scientists to share resources.
It was headed by Dr. J.C.R. Licklider.
Question No: 35 ( Marks: 5 )
Define professional ethics and its benefits with an example?
ANS:-
Professional Ethics
• Professional ethics are a category of ethics, and here we discus the professional
ethics relevant to computing
• Awareness of professional ethics is gaining importance with time as the decisionmaking
process in the work place keeps on increasing in complexity
• The professional ethics provide a way of simplifying that decision making process
Let us now discuss a few situations where I will request you for your ethical opinions
Question No: 36 ( Marks: 5 )
Write JavaScript code for the following:
Make a function compareWithTen(value)
Compare the function argument with ‘10’ and display a message whether the value is less than, equal to or
greater than 10.
FINALTERM EXAMINATION
Spring 2010
Question No: 27 ( Marks: 2 )
What are application softwares? List down the names of three application softwares.
ANS:-
Definition: Application Software are that software then can interact directory with the user for performance of
respective type of work.
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Following are the types of Application Softwares:-
• AutoCAD and Corel Draw
• Business Software
• Productivity SW
• Games Software
Question No: 28 ( Marks: 2 )
Why Local variable is preferred over Global variable ?
ANS:-
Global variable has some advantage with Local variables is preferred due to the following reasons:-
When we declare any global variable in web page then in case of error and logic it’s very difficult to see on which line
this variable is used and what’s his value if we have more than 2000 lines and all the functions in web page using that
Global Variable so Global variables can make the logic of a Web page difficult to understand.
As we know we can use Global variable everywhere so Global variables also make the reuse and maintenance of
your code much more complex.
Question No: 30 ( Marks: 2 )
What is Structured Vector Graphics ?
ANS:-
This is a plug-in that is required to view swf (flash) files in the web browser
Question No: 31 ( Marks: 3 )
What kind of new jobs are created because of computing? And which old professions are being eliminated?
ANS:-
Due to computing where people are getting benefits from automated systems on the other hand the people that are
with KHATA system or Manual system and they don’t know about computers are eliminated due to this reason and
people take place of many people. We can see in the offices where before computer if there are four person required
now only one person is required for example with the help of database we can store more than thousand of
information and only one person is managing the whole data that is DBA. In the old system many people are writing
the data in registers and then its also very difficult to find the specific record.
Now we can see companies are hiring:-
Data Entry Operators
System Engineers
Software Developer
DBA etc.
FINALTERM EXAMINATION
Spring 2010
Question No: 28 ( Marks: 2 )
Write names of the DoS attack’s phases?
ANS:-
DoS (Denail of service): DoS attach has in total 3 phases and below they are listed:
1. Search
2. Arm
3. Attack
Question No: 32 ( Marks: 3 )
5
Briefly mention any three problems in old modes of presentation development
ANS:-
Lack of resolution
Low color configuration
No graphic animation
Question No: 34 ( Marks: 5 )
Why the quality of image in dithering scheme is not good?
ANS:-
In this scheme, pixels of alternating colors are used to simulate a color that is not present
in the platelet
For example, red and green pixels can be alternated to give the impression of bright
yellow
The quality of the displayed image is poorer
FINALTERM EXAMINATION
Spring 2010
Question No: 27 ( Marks: 2 )
Define the term 3D Rendering
ANS:-
The process of converting information about 3-D objects into a bit-map that can be displayed on a 2-D computer
display.
Question No: 29 ( Marks: 2 )
Define testing with respect to programming..
ANS:-
Testing:- The tasks performed to determine the existence of defects.
Programming:- The process of telling the computer what to do.
Question No: 30 ( Marks: 2 )
What is a compiler? Write its one benefit over interpreter.
ANS:-
Compiler translates the program written in a HLL in one go. The translated code is then used by the uP whenever the
program needs to be run. In contrast of interpreter, a compiler translates high-level instructions directly into machine
Language Compiled programs generally run faster than interpreted programs.
Question No: 31 ( Marks: 3 )
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Who is a Computing Professional?
ANS:-
Computing technology has changed our way of life like no other technology. We need to study how it has done it to
highlight the mistakes and success stories of the past. We need to do it so that we can learn from them and select our
future direction
Accordingly.
Question No: 33 ( Marks: 3 )
What is ICMP?
ANS:-
ICMP is the "Internet Control Message Protocol". ICMP packets are small packets used in local networks and on the
Internet, most typically, for network troubleshooting and problem location.
Question No: 35 ( Marks: 5 )
Write down the advantages of Natural Language Processing.
ANS:-
It is able to read what you write, comparing it to a stored database of texts. It then corrects your errors and suggests
alternatives. What advantages can this give you? Here are some:
1. You Don't Have to Worry About Careless Mistakes and Typos
2. Your Grammar and Punctuation Errors are Fixed
3. Allows You To Get More Accomplished
4. Gives You A Better Vocabulary
5. Instantly Upgrades Your Communication Skills
Question No: 36 ( Marks: 5 )
Draw hierarchy of the people in the small project?
FINALTERM EXAMINATION
Spring 2010
Question No: 30 ( Marks: 2 )
What was the obstacle to the construction of analytical engine?
ANS:-
Charles Babbage had huge difficulties raising money to fund his research. As a last resort, he designed a clever
mathematical scheme along with Ada, the Countess of Lovelace. It was designed to increase their odds while
gambling. They bet money on horse races to raise enough money to support their research experiments
Guess what happened at the end? The lost every penny that they had.
.
Question No: 33 ( Marks: 3 )
Give any three applications of computer graphics?
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Question No: 34 ( Marks: 5 )
Mention any five applications of Artificial Intelligent System
ANS:-
1. Games
2. Image recognition
3. Medical diagnosis
4. Robots
5. Business intelligence
Question No: 36 ( Marks: 5 )
Explain function arguments with the help of an example?
ANS:-
A named group of statements that is put together once and then used (by reference)
repeatedly on a Web page
Code becomes easier to read, understand and maintain
FINALTERM EXAMINATION
Spring 2009
Question No: 31 ( Marks: 1 )
What are the elements of website design? Any one
ANS:-
Navigation scheme
Layout of information
Overall look and feel
Question No: 33 ( Marks: 2 )
What is meant by universal access of internet services ?
ANS:-
Universal access of internet services means same functionality to every one.
Question No: 38 ( Marks: 5 )
Differentiate between For and While loop by writing the syntax of both loops.
ANS:-
When the exact number of iterations is known, use the ‘for’ loop
When the number of iterations depend upon a condition being met, use the ‘while’ loop
‘for’ loops become especially useful when used in conjunction with arrays
We’ll find out about arrays today, and we’ll probe their usefulness as part of ‘for’ loop
structures
Question No: 41 ( Marks: 10 )
Is tabular data storage better than flat file data storage? Justify your answer.
ANS:-
1.Similar items of data form a column
2.Fields placed in a particular row – same as a flat-file record – are strongly interrelated
3.One can sort the table w.r.t. any column
4.That makes searching – e.g., for all the books written by a certain author – straight
forward
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5.Similarly, searching for the 10 cheapest/most expensive books can be easily
accomplished through a sort
6.Effort required for adding a new field to all the records of a flat-file is much greater
than adding a new column to the table
CONCLUSION: Tabular storage is better than flat-file storage
FINALTERM EXAMINATION
Spring 2009
Question No: 31 ( Marks: 1 )
In programming, what is a loop?
ANS:-
In computer science a for loop is a programming language statement which allows code to be repeatedly executed. A for
loop is classified as an iteration statement.
Question No: 32 ( Marks: 1 )
What are the other names of function? Any one.
ANS:-
Routine , procedure , sub program
Question No: 33 ( Marks: 2 )
How JavaScript Arrays are heterogeneous?
ANS:-
Arrays are heterogeneous in java script because at the same time simultaneously they can hold
elements of multiple data types
Question No: 34 ( Marks: 2 )
What is the database?
ANS:-
Data base is a collection of organized data in a proper way that computer can quickly search for any
desired data item, its an easy way of allowing of manipulation of data, they are design in such a way
that access to any desired data can be identified and reached quickly and easy, they are generally
consist of collection of interrelated files.
Question No: 35 ( Marks: 3 )
Differentiate between LAN and WAN with one example of each.
ANS:-
LAN is a local area network where as wan is a wide area network
LAN can be used in a specific areas with limited computers where as wan can be used on computers
shared by large distances
For example LAN can be used on pc s or an organization located in one building but wan can be used
on large scales like banks all over or in any Large communication systems
Question No: 36 ( Marks: 3 )
What are Trojan Horses?
ANS:-
Trojan horses are a kind of cyber crime, they are v harmful to computer because they are stand alone
program and the look like what they are not like any thing amusing or not harmless like games..
Question No: 38 ( Marks: 5 )
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What are the important properties, methods and event handlers of image object?
ANS:-
The primary use of the image object is to download an image into the cache before it is needed to
display , image object can be used to create different kinds of animations or to display one of several
images based on the desired requirement , in java script image object can be used to display the
required pre loaded image
Properties of image object is :- height , width ,hspace ,vspace , src , name border etc
Methods :none
Event handlers: on aboart , onload, onerror etc
Question No: 40 ( Marks: 10 )
Write a note on :
Coding guidelines
Guidelines for developing short programs.
ANS:-
Coding guidelines
• Always use semicolons to end statements
• Indent blocks of code (2 to 5 spaces)
• Identifiers
• Use the camel back scheme
• Variables: nouns
• Functions: verbs
• Comment Liberally
• Make them descriptive but concise
Guidelines for developing short programs.
• Read and understand the problem
• Do you have all the required data?
• No: Get it
• Else assume it. State it explicitly
• Do the design
Question No: 41 ( Marks: 10 )
write a note on each of the following:
a. Vector or Object-Oriented Graphics:
b. Bit-Mapped or Raster Graphics:
ANS:-
Vector or Object-Oriented Graphics:
In Vector or object oriented graphic everything drawn is treated as object. objects retain their identity
after they are drawn. These objects can later be moved, stretched, duplicated, deleted,etc. they are
resolution independent and have relatively small file size. the examples are: swf, svg, wmf, ps
brass_ibrahim: Vector graphics is the use of geometrical primitives such as points, lines, curves, and
shapes or polygon(s), which are all based on mathematical equations, to represent images in computer
graphics.
brass_ibrahim: The term "vector graphics" is mainly used today in the context of two-dimensional
computer graphicsVirtually all modern 3D rendering is done using extensions of 2D vector graphics
techniques .Virtually all modern 3D rendering is done using extensions of 2D vector graphics
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techniques
Bit-Mapped or Raster Graphics:
Treats everything that is drawn as a bit-map
If an object is drawn on top of another, it is difficult to move just one of them while
leaving the other untouched
Changing the resolution often requires considerable touch-up work
Relatively large file size
Examples: gif, jpg, bmp
masood.tariq: Bit-Mapped or Raster Graphics:
Treats everything that is drawn as a bit-map
If an object is drawn on top of another, it is difficult to move just one of them while
leaving the other untouched
Changing the resolution often requires considerable touch-up work
Relatively large file size
Examples: gif, jpg, bmp
FINALTERM EXAMINATION
Spring 2009 Final
Question No: 27 (Marks: 1)
What BIOS stands for?
ANS:-
Binary Input Output System
Question No: 28 ( Marks: 1 )
List down the Analytical Engine's components name (any two)
ANS:-
Google & Netscape,
Question No: 29 (Marks: 2)
Why uploading a web page is important? Describe in 2 – 3 lines.
ANS:-
By only uploading webpage we could place our information in order the other can reach up to ready
what we load, upload means make available our data or information for the world web browsers
Question No: 30 ( Marks: 3 )
What is the difference between microprocessors and microcontrollers? Give one example of
both.
ANS:-
The microprocessor is electronic equipment which can perform several function and also processing of
data and information present in a computer, while microcontroller can only perform one function for that
its design
Example
Microprocessors _ Pentium 4
Microcontroller _ can be a switch in side the washing machine
Question No: 31 ( Marks: 5 )
Differentiate uni-Processor OS from Multi-Processor OS.
ANS:-
The Multiprocessors is when more than one processor is under operation it can be several or may
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hundreds of the kind to perform one great operation or calculation, while our PC is a kind of uniprocessor
Question No: 32 ( Marks: 5 )
Why do we call JavaScript an Object-based Language?
ANS:-
Java Script is a language by which we are writing our web-pages, this language is designed to work for
web pages
FINALTERM EXAMINATION
Spring 2009 Final
Question No: 31 ( Marks: 1 )
What is heuristic?
ANS:-
Common sense Lesson drawn from experience
(Artificial) Intelligent Systems
SW programs or SW/HW systems designed to perform complex tasks employing strategies that mimic
some aspect of human thought
or
• a commonsense rule (or set of rules) intended to increase the probability of solving some
problem
• of or relating to or using a general formulation that serves to guide investigation
Question No: 32 ( Marks: 1 )
In programming, what is an object?
ANS:-
A named collection of properties (data, state) & methods (instructions, behavior)
Question No: 33 ( Marks: 2 )
What is spreadsheet? List any two jobs that it can do.
ANS:-
A spreadsheet is a grid that organizes data into columns and rows. Spreadsheets make it easy to
display information, and people can insert formulas to work with the data.
1. Electronic replacement for ledgers Charts
2. financial-forecasting
Question No: 35 ( Marks: 3 )
Explain how many ways businesses monitor their employees?
ANS:-
• Systems are available that monitor almost every key stroke that an employee makes on a computer
• Systems are available that read and censor all incoming and outgoing eMail
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• It is quite straight forward to monitor where you surf, and when
Question No: 36 ( Marks: 3 )
What is difference between Design and System Architecture?
ANS:-
Only the higher level designs are called System Architecture and lower level designs can not be called
system Architecture, and we can also say the every Architecture can be called design but every design
can not be called Architecture. (For Reference Listen Lecture No.24)
Question No: 38 ( Marks: 5 )
How many ways are there to call a function in a program? Explain with example
ANS:-
Functions do not run automatically. When the page loads, each function waits quietly until it is told to
run
C a l l i n g a F u n c t i o n F r om a n E v e n t H a n d l e r
A n e v e n t h a n d l e r i s a c omma n d w h i c h c a l l s a f u n c t i o n w h e n a n e v e n t
h a p p e n s , s u c h a s t h e u s e r c l i c k i n g a b u t t o n .
T h e c omma n d i s w r i t t e n i n t h e f o rma t o n E v e n t , w h e r e E v e n t i s t h e
n ame f o r a s p e c i f i c a c t i o n . H e r e a r e s ome c ommo n e x amp l e s :
C a l l i n g a F u n c t i o n F r om An o t h e r F u n c t i o n
function doSomething() {
doSomethingElse(); // This line calls the next function
}
Question No: 39 ( Marks: 5 )
Elaborate the ‘+ ’ operator and its constraints with the help of examples
The “+” String Operator
The “+” operator can be used to concatenate two strings
title = “bhola” + “continental”
The value of the variable title becomes “bholacontinental”
Question No: 40 ( Marks: 10 )
Write a JavaScript program having two functions sum and mean.
ANS:-
The web page will ask the user to enter five values to be added.
After taking input it will calculate the sum and mean of those values by calling sum and mean
functions.
Question No: 41 ( Marks: 10 )
Define the following terms.
ANS:-
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Object
A named collection of properties(data, state) & methods (instructions, behavior)
Event Handler
A n e v e n t h a n d l e r i s a c omma n d w h i c h c a l l s a f u n c t i o n w h e n a n e v e n t
h a p p e n s , s u c h a s t h e u s e r c l i c k i n g a b u t t o n
Local Variable
Declaring variables (using the var keyword) within a function, makes them local•They are available only
within the function and hold no meaning outside of it
Scope of Variable
Defining the space in which a variable is effective is known as
Defining the scope of a variable. A variable can be either local or global in scope
Array
An indexed list of elements
FINALTERM EXAMINATION
Fall 2009
Question No: 32 ( Marks: 1 )
What does TCP/IP stand for?
ANS:-
TCP stand for Transmission Control Protocol
IP stands for Internet Protocol
Question No: 34 ( Marks: 2 )
What is the use of Default keyword in switch structure?
Question No: 36 ( Marks: 3 )
Where "While" loop is more preferable than "For" loop and vice versa? , explain with the help
of example.
Question No: 37 ( Marks: 3 )
What do you mean by FTP or File Transfer Protocol?
ANS:-
This protocol is used to upload and download the files on remote computers.
Question No: 41 ( Marks: 10 )
Develop a web page that displays six thumbnail images. A main image should change to a
larger version of the thumbnail as soon as the mouse moves over a thumbnail image. Write
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complete HTML and JavaScript code.
FINALTERM EXAMINATION
Fall 2009
Question No: 32 ( Marks: 1 )
Name any software which can be used to make a presentation.
Question No: 38 ( Marks: 5 )
In which situation, we use
i- switch construct
ii- multiple If-else construct
Question No: 39 ( Marks: 5 )
What are the responsibilities and profile of a Team Lead?
ANS:-
Team Lead
• Responsibilities:
– Planning and tracking of the project
– Detailed design
– Professional development of team members
– In case of small teams, development activities
• Profile:
– 5+ years of development experience
– Excellent interpersonal skills
– Good planning skills
– Good design skills
Question No: 40 ( Marks: 10 )
Give any five well-known design heuristics for architectural design.
ANS:-
Given many parts of a system to be designed/built, do the hard part 1st.
All the serious mistakes are made on the very first day.
Simplify, simplify, simplify! Probably the most useful heuristics for increasing reliability while decreasing
cost & time-to-build.
FINALTERM EXAMINATION
Fall 2009
Question No: 31 ( Marks: 1 )
What does NIC stand for?
ANS:-
Network Interface Cards.
15
Question No: 32 ( Marks: 1 )
Why there is a need to use primary key in database ?
ANS:-
Primary Key is a field that uniquely identifies each record stored in a table.
Question No: 37 ( Marks: 3 )
Write JavaScript code to convert the number 236.2363611111556 into currency format and
JavaScript statement to show output.
Question No: 39 ( Marks: 5 )
Write a short note on:
a. Good programming methodology?
b. Correct program
ANS:-
Good programming methodology
A methodology that enables the lowest-cost and on-schedule development of programs that are
correct, easy to maintain & enhance.
Correct program
A program with correct syntax & semantics.
FINALTERM EXAMINATION
Fall 2009
Question No: 32 ( Marks: 1 )
What kind of information can be stored in a database?
ANS:-
It can store numbers, Booleans, sound, video, images etc.
Question No: 33 ( Marks: 2 )
Define the key weakness of the web?
ANS:-
Initially web was designed only for humans to read not for computers to understand it.
Question No: 34 ( Marks: 2 )
How many iterations would this ‘for’ loop run for?
for ( x = 50 ; x < 0 ; x = x - 1 ) {
document.write ( x ) ;
}
Answer:
50 iterations
Question No: 35 ( Marks: 3 )
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How can we define a Pixel?
ANS:-
It is the smallest element of image which is spread with regular array on display and each element
consist of particular color.
Question No: 36 ( Marks: 3 )
Write JavaScript code to convert the number 236.2363611111556 into currency format and
JavaScript statement to show output.
Question No: 37 ( Marks: 3 )
Write code in JavaScript to display the odd numbers between 20 to 100 using FOR statement.
Note: No need to write whole HTML program. Just JavaScript code of require part is require.
Question No: 38 ( Marks: 5 )
How marketing strategies are changed with the progress in computing? How new marketing
strategies are implemented?
ANS:-
Marketing Strategy Changes with the new requirements of the modern era and the applications of the
business. The web has changed marketing strategy from a mass focus to single person focus. We
collected data and analyze accordingly to find out the behavior of the market and end users. In new
marketing more advertising is being done through email and web and get feedback.
Question No: 39 ( Marks: 5 )
<script>
Number = new Array(5);
var abc=4;
for(var i=1; i<=5 ; i=i+1)
{
Number[i]= abc*i;
}
Number.reverse();
for(j=0;j<5;j=j+1)
{
document.write(" "+Number[j]+"<BR>");
}
</script>
A) What should be output of above code?
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B) Explain the highlighted lines of code?
Question No: 40 ( Marks: 10 )
Write a brief note on each of the following.
v FTP
v Telnet
v Instant messaging
v VoIP
ANS:-
FTP: File Transfer Protocol: This protocol is used to upload and download the files on remote
computers.
Telnet: FTP allows file operations only while Telnet can log on to a computer of other users through
TCP/IP network and use like a local user, it help in testing of remote web server.
Instant Messaging: This is the service of messaging provided on the internet like MSN messenger,
Yahoo messenger, through which we interact people randomly whenever required.
VoIP: Voice over IP, It is used to transmit the voice from one IP to another IP, In which voice is first
broken down and then transmitted over a network.
Question No: 41 ( Marks: 10 )
What are Commonsense Guidelines to avoid viruses? Discuss about Antivirus as well.
ANS:-
Commonsense Guidelines to avoid viruses are as follows:
1. Do not open attachment of unwanted emails.
2. Don’t used copied/pirated Softwares
3. Regularly place data somewhere as backup
4. Use Registered and Trusted Softwares only.
5. Install Antivirous in the system
6. Update your Windows and softwares with the passage of time.
7. Scan before using any external device with your system as USB Device.
Antivirus:
This is the software design for preventing your system from harmful effects and maintain the speed of
computer. These softwares are available on the CD’s and DVD’s. These softwares continuously
monitor the systems and aware when any harmful virus is detected and asked for the further
operations. Some automatically remove the viruses from the system.
FINALTERM EXAMINATION
Fall 2009
Question No: 32 (Marks: 1)
What are Local or Function-level Variables?
18
ANS:-
Declaring variables (using the var keyword) within a function, makes them local.
They are available only within the function and hold no meaning outside of it.
Question No: 34 (Marks: 2)
What is the Data Normalization? Also define its goal.
ANS:-
Data normalization is to sort out complex data into simple form. It uses to simplify the complex
information to make it more user-friendly.
Question No: 36 (Marks: 3)
Differentiate Local and Global Variables.
ANS:-
Local variables are the variables have limited scope while global have bigger scope
Local variables are not accessed by others while global is accessible to every one
Local variable used by single user while global variable can be used by different users at time from all
around.
Question No: 38 (Marks: 5)
How DoS attack is a cyber crime? For what cyber crime can be used?
ANS:-
DoS stands for Decline of Service and it is a cyber crime as it jams and in some cases shut down the
targeted computer by sending too much unnecessary data packets to it which ultimately exceeds the
normal processing eventually results the computer or server to stuck and unable to provide services to
others. It can be used to destroy the fame and diminishing of no of users requesting information and
services from that particular server or computer.
FINALTERM EXAMINATION
Fall 2009
Question No: 31 ( Marks: 1 )
SMTP stands for what?
ANS:-
Simple Mail Transfer Protocol
Question No: 33 ( Marks: 2 )
In which situation we should use Inline Event Handling?
ANS:-
Event handler are placed in the BODY portion of a web page as attributes of HTML tags
The event handler attributes consist of 3 parts
a) The equal sign
b) The identifier of event handler
c) A string consisting of java script statements enclosed in double or single string
Multiple JavaScript statements can be placed in that string, but all have to fit in a single line.
No new line characters with in line event handling
Inline event handler can be used normally in a condition when we want to execute the eventd direclty
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and quickly in the same line of code.
Question No: 39 ( Marks: 5 )
What is animated gif? How can we use it? If we animate images in JavaScript then is it better?
ANS:-
It is bit mape image format introduced in 1987by compuserve.It support up to 8 bits per pixel.It also
support animation And allow a separate palette of 256 colors for each frame.
Uses: We can use it in web site they are suitable for sharp edged line art with limited number of
colors. They are good for small animation and low resolution clips.
The size is small and on web site they can uploaded and downloaded easily
Question No: 40 ( Marks: 10 )
What is the problem with Relational Database and what solution you can suggest for it?
ANS:-
when we use to store object oriented data into a Relational database it need to be translated in form
which is suitable for the relational database.
Again when we need to read RDBMs the Data need again back to be translated into object oriented
form to read.
This two process delay associated processing and time spent in writing and maintaining the translation
codes are the key disadvantage with Relational Database .
Solution:
Object oriented database
Object Relational database
The data should be divided and save in multiple table and tabular form ,so that open ,searching
.sorting ,editing and saving of data can be performed quickly.
With tabular form one can sort w.r
Question No: 41 ( Marks: 10 )
How can we neutralize DoS attack? Can we track the attacker?
ANS:-
Denial of service attempt to make a computer resource unavailable to its Intended user . Easiest way
to survive an attack is to have planned for the attack.
Good contact with ISP and some security providers and CERT are essential also having a separate
emergency block of IP address for Critical servers with a separate rout can be effective.
We should use genuine operating system can also be helpful.
By using an extremely stateful packet filter that will inexpensively drop any unwanted packet serviving
DoS attack Becomes much Easier.
We can also use Fierwalls .
Using Antivirus softwear
Using private net work
Using encryption
Network Sniffer
Intrusion detector By using all these techniques we can neutralize DoS Attack
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Investigative process should begin immediately after the DoS Attack begins.By using IP address we
can Track Attacker.
FINALTERM EXAMINATION
Fall 2009
Question No: 31 ( Marks: 1 )
What is bandwidth?
ANS:-
Bandwidth is a capacity of communication channel of carrying data.
Question No: 32 ( Marks: 1 )
What is “My Personal Agent”?
ANS:-
A computer programe that work automatically and have voice interface
Question No: 33 ( Marks: 2 )
For what purposes FTP is used in networks ?
ANS:-
To download or upload files / data to a remote computer
Question No: 34 ( Marks: 2 )
How can you define a readable program?
ANS:-
A program that is easy to read & understand also easy to maintain and enhance.
Question No: 36 ( Marks: 3 )
How can you define a consistent web design? Why is it needed?
ANS:-
A consistent web design is Easy understandable, not with heavy graphics, easy navigation. It is
needed because most of the website views leave the site because of poor navigation and not easy to
understand, text and design is not clear etc.
Question No: 38 ( Marks: 5 )
What are the advantages of multimedia presentations? Write any five.
ANS:-
Multimedia presentation is a great tool for effective communication:
Advantages:
1. Easy to make last minute change
2. More attractive
3. Can include animation, videos etc.
4. Better presentation easy to understandable for participants comparing to manual presentation.
5. Undo feature
Question No: 39 ( Marks: 5 )
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Can a human doctor be replaced by an Expert System? Give reasons to support your answer.
ANS:-
Expert System is a computer system which simulates the knowledge and expertise of a human expert.
Yes, a human doctor can be replaced by an Expert System. Following are the reasons to support my
1. A large database of knowledge can be added to and kept up to date, it can store more knowledge than a person.
2. The Expert System cannot FORGET or get facts wrong.
3. It survives forever. There is no loss of knowledge as there is when a doctor retires.
4. The Expert System can access specialist knowledge that a doctor may not have.
Question No: 40 ( Marks: 10 )
Explain the following issues of Data Management? (3+4+3)
1. Data entry
2. Data updates
3. Data security
ANS:-
DATA ENTRY:
There is new data entered every day.
New customers are added every day.
Some of the data entry requires the manual entry into computer system
New data entry needs to be entered correctly
DATA UPDATES:
Old titles must be removed regularly
Data changes every time
Prices change
Transportation / shipping cost changes
Customer personal data changes
Schemes changing, new offers
Every new entry needs to be entered correctly
DATA SECURITY:
All data in the system is very critical to its operation, the security of the customer’s personal data is
most important. Most of the hackers are always trying for that type of information specially Credit Card
Numbers.
This problem can be managed by using proper security arrangements and mechanisms that provides
access to only authorized entities. System Security can be improved through, encryption, firewalls and
updated Antivirus Softwares
Question No: 41 ( Marks: 10 )
Write a note on the followings
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a. Image Preloading process
b. Animated Gifs
IMAGE PRELOADING PROCESS:
The primary use of image preloading process is to download the image into the cache before it is
actually needed to display.
PROCESS:
1. An example of the image object is shaped using the NEW keyword
2. The src property of this instance is set equal to the filename of the image to be pre-loaded
3. This step starts the down-loading of the image into the cache without actually displaying
4. When a pre-loaded image is required to be displayed, the src property of the displayed
image is set to the src property of pre fetched image
ANIMATE GIFS:
We can save 16 gif images of the previous example in a single file in the form of an animated gif, and
then used it in a regular <IMG> tag to display a moving image. However, JavaScript provide better
control over the sequencing and the gap between the individual images.
FINALTERM EXAMINATION
Fall 2009
Question No: 31 ( Marks: 1 )
What is the out put of the following JavaScript code ?
name=”Ali Akbar”;
document.write(name.charAt(4)) ;
ANS:- A
Question No: 32 ( Marks: 1 )
What does WAN stand for?
23
ANS:-
Wide Area Network – A network in which computers are separated by great distances typically across
cities or even continents.
Question No: 33 ( Marks: 2 )
Why hub is used in networks?
ANS:-
The network traffic controller – components of convential computer networks. Hub is used to connect
the different computers in the network i.e. to the server.
Question No: 34 ( Marks: 2 )
What is output of the following JavaScript code ?
Str=”Virtual University of Pakistan”;
document.write(str.substring(5,str.length)) ;
Question No: 37 ( Marks: 3 )
Elaborate Vector or Object oriented graphics with atleast one example.
ANS:-
Treats everything that is drawn an object. Objects retain their identity after their drawn. These objects
can later be easily moved stretched duplicated deleted etc are resolution independent relatively small
size. e. g. swf, wmf,
Question No: 39 ( Marks: 5 )
Why should we, as computing professionals, be interested in studying the social implications
of our creations?
ANS:-
This is imp. Because of keeping the track of money wise while implementation actually and see the
results. This fits with the organization or no. to check there is any side effects morally or no. we have to
be very careful while creation of any system., error free, data loose recovery. Etc.
Question No: 40 ( Marks: 10 )