Group A:
Multiple Choice Questions (9 x 1=9)
Tick the best alternative.
1. Which one of the following is an input device?
a) speaker
b) printer
c) monitor
d) mouse
2. Which of the following is NOT a bus type?
a) Address bus
b) Data bus
c) Memory bus
d) Control bus
3. How to represent Boolean F(x,y)=x.y in logic gate?
Ans Option A
4. Which scheduling algorithm allocates the CPU first to the process
that requests the CPU first?
a) first-come, first-served
scheduling
b) priority scheduling
c) shortest job scheduling
d) Round robin scheduling
5. Which operator is used to start for enter the formula in in Excel
cell?
a) $
b) @
c) =
d) +
6. Which looping process checks the test condition at the end of the
loop?
a) for
b) while
c) do-while
d) Nested loop
7. How to insert an image in web page using HTML tag?
a) <img=...>
b) <img source=...>
c) <img src=...>
d) <img href=..>
8. Which image format is best used for photographs and offers a small
file size?
a) PNG
b) GIF
c) BMP
d) JPEG
9. Which of following is monitors user activity on internet and
transmit that information in the background to someone else?
a) Malware
b) Spyware
c) Adware
d) Virus
Recommended: Class 11 Computer Notes Based on New Syllabus
Group 'B'
Give short answer to the following questions. (5 x 5=25)
1. Explain different types of secondary memory
of computer system.
Answer:
A secondary storage media is the physical material on
which data and programs are stored on a long term basis or for future
reference.
The different types of secondary memory are:
a.
Hard Disk
or Magnetic Disk:
Hard disk is a
most commonly used storage device in personal computers and laptops most
application programs and operating systems require hard disk for installation
and operation. It contains one or more metal platters mounted on a central
spindle, like a stack of rigid diskettes. A hard disk is actually a stack of
platters. Each platter is coated on both sides with magnetic material. Both
surfaces of each disk or platter are used to store information except for the
top and bottom platters. The hard disk and drive is a single unit.
b.
Floppy
Disk:
A floppy disk
is a magnetic storage media. The floppy disk is a thin and flexible plastic disk
made of up Mylar coated on both side with magnetic recording material (ferrous
or iron oxide). It is also called a diskette. It is packed in a stiff protected
jacket made of plastic. IBM invented the floppy disk in 1972 the size of the
first floppy disk was 8-inch and had flexible plastic cover. It is slower than
hard disk.
c.
Magnetic
Tape:
Magnetic tape
is the most popular and oldest storage medium used to store large amount of
data and instructions permanently. The magnetic tape is a plastic ribbon with
width 0.25 inch to 1 inch and one side coated with magnetic recording material
(ferrous-oxide or iron-oxide), which can be magnetized. Data is stored on the
tape in the form of magnetic field, i.e. magnetized and non-magnetized spots. Representing
1's and 0's respectively. Like magnetic disk, magnetic tape should also be
formatted to store data on it.
d.
Zip Disk:
Zip disk is a
type of portable magnetic media. its storage capacity is about 100mb to 800mb. It
is used to back up important data. Zip disk is similar to floppy disk but its
storage capacity is about 100 times greater than floppy disk. it is also more
reliable storage medium than floppy disk. Like floppy disk, the data can be
easily transferred from one computer to another by using zip disk.
e.
Optical
Drive:
But in the case
of optical storage, the read write process uses optical properties like laser
beams. Today somehow used and reliable storage devices. These devices use laser
technology i.e. laser light to write and read data to and from the optical disk
such as CDs (compact disks) the most popular optical storage devices are CD-ROMs
DVD-ROMs cd-recordable, and CD- rewritable etc.
OR
Describe the decimal to binary number conversion process with example.
Answer:
Decimal number is converted into
equivalent binary number by using successive division by 2 where remainders
noted during successive division are written in bottom-up approach to get the
equivalent binary values.
Ex: (125)10 = (? )2
Fraction part of any decimal number is converted into binary number by successive multiplication to the given number with the respective base 2. The process is terminated when we get 0 in the fraction part of product. When we fail to get 0, then we may terminate the process after 5th round. The integer values that come from each successive multiplication are written in top-down approach.
Ex: (125.52)10 = ( ? )2
2. What are the functions of operating system?
Describe.
Answer:
The function of an operating
system is described below:
a) IO Management
Input/output (IO) is an essential
element for the operation of any computer. It allows the computer to interact
with peripheral devices such as a keyboard, mouse, terminals (like modem, TV
card, and NIC card), disks or tapes (CD, DVD, and Floppy disk), printer etc.
b) Command interpreter
The command interpreter reads the
commands that a user types at a terminal, interprets them, and translate them
into a detailed set of instructions that the computer hardware can understand.
It varies from one OS to another. Every OS must provide command interpreter of
its operation.
c) Data Management
Data management allows organizing
their data into logical groupings called files. Earlier, only a few of OS
provide data management, containing limited flexibility and usefulness. At
present, most of the OS provides this feature.
d) Memory Management
Memory management is the function
responsible for managing the computer's primary memory. Memory is a large array
of words or bytes, each with its own address. When the user requests to the CPU
for read/write operation, OS determines the amount of memory required for the
program instructions and data. Then, OS allocates required memory to load the
program and data into RAM. When a program terminates, its memory space is free
and the same memory area can be allocated to another program.
e) Deadlock prevention:
During the processing, a
situation can arise in which a resource (hardware or software) shared by two or
more processes cannot continue because the resource required by a process is
held by another. This situation is known as deadlock.
For example: if process 1 is
allocated to resource A and later it requests resources B, and process 2 is
allocated to resource B and later it requests to resource A. in this situation,
neither process 1 nor process 2 will be executed. Such a situation is known as
deadlock. Such condition is avoided by OS.
3. Define different types of CSS.
Answer:
There are four ways to embed CSS
in HTML document:
1. Inline
Style:
Inline style is very simple
method of style web page. In this method style for HTML elements is specified
using its style attribute.
<body>
<h1 style=”font-size:100pt; color:green; text-decoration:underline;
font-family:arial”>Galaxy Secondary School</h1>
</body>
2. Embedded Style
Embedded style sheet is created
by using tag <style> inside <head> element of HTML document.
<html>
<head>
<style> p {
font-size:
20
pt; color:purple; background-color:red; border-style:solid;
border-color:yellow;
}
</style>
</head>
<body>
<p>Galaxy Secondary School</p>
</body>
</html>
3. Class Style
Class style is more flexible
method of defining style sheet. A dot (.) operator is used to define a class.
Its attributes are defined within curly braces. You can use this class style as
an external style sheet or as an embedded style sheet. It is accessible inside
class using the following syntax: <tag class=”class_name”> …………….
</tag>
<html>
<head>
<title> Class Style
</title>
<style>
.x1{font-size:50pt; color:green;
font-family:arial;}
.x2{font-size:100pt; color:red;
text-transform:uppercase;}
</style>
</head>
<body>
<p class=”x1”>Galaxy
Secondary School</p>
<h1 class=”x2”>Dhangadhi 5
Hasanpur</h1>
</body>
</html>
4. External Style
An external style sheet is a
separate HTML document file with extension .css, the css file contains css
rules which are linked to the HTML file by using the following code in
<head> section. <link rel=”stylesheet” href=”file_name.css”>
OR
Explain the different components of multimedia.
Answer:
Text: characters that are used to create words,
sentences, and paragraphs.
Graphics: A digital representation of non-text information,
such as a drawing, chart, or photograph.
Animation: Flipping through a series of still images. It is
a series of graphics that create an illusion of motion.
Video: Photographic images that are played back at speeds of
15 to 30 frames a second and provide the appearance of full motion.
Audio: Music, speech, or any other sound.
4. Differentiate between the do and while
loop.
Answer:
|
while |
do while |
|
It is entry controlled loop or pre-tested loop. |
It is exit controlled loop or post tested loop. |
|
It checks the condition first then executes the
loop body. |
It executes the loop body first then checks the
condition. |
|
It uses keyword while. |
It uses keyword do and while. |
|
It is not terminated by semicolon. |
It is terminated by semicolon. |
|
Syntax: while (condition) { statements; } |
Syntax: do { statements } while (expression); |
5. Suggest the prevention methods of
cybercrime.
Answer:
I.
Use
Strong Passwords
Use different user ID / password
combinations for different accounts and avoid writing them down. Make the
passwords more complicated by combining letters, numbers, special characters
(minimum 10 characters in total) and change them on a regular basis.
II.
Secure
your computer
Activate your firewall –
Firewalls are the first line of cyber defense; they block connections to
unknown or bogus sites and will keep out some types of viruses and hackers.
Use anti-virus/malware software
Prevent viruses from infecting your computer by installing and regularly
updating anti-virus software.
III.
Block
spyware attacks
Prevent spyware from infiltrating
your computer by installing and updating anti-spyware software.
IV.
Be
Social-Media Savvy
Make sure your social networking
profiles (e.g. Facebook, Twitter, YouTube, MSN, etc.) are set to private.
V.
Check
your security settings.
Be careful what information you
post online. Once it is on the Internet, it is there forever!
VI.
Secure
your Mobile Devices
Be aware that your mobile device
is vulnerable to viruses and hackers.
VII.
Protect
your Data
Use encryption for your most
sensitive files such as tax returns or financial records
Make regular back-ups of all your
important data and store it in another location.
Group 'C'
Give long answer to the following question (2 x 8=16)
1. Explain computer architecture with block
diagram and functions of its components.
Input Unit
Input unit is a device that is
used to get the data and instruction into the computer. The input can be entered
either by typing on keyboard or by using point and click devices. It includes mouse,
keyboard, joystick, microphone, webcam etc.
·
Accept the data and instruction from the outside
world.
·
Convert it to a form that the computer can understand.
·
Supply the converted data to the computer system
for further processing.
Central Processing Unit:
CPU is the major component of any
computer system. It acts as a heart and brain of a computer and performs all
the processing related activities. Therefore it is called as the processing
unit and popularly known as central processing unit (CPU).
·
It performs all calculation.
·
It takes all decision.
·
It controls all units of the computer.
It is the combination of three
components ALU, CU and Register Array.
i.
Arithmetic
Logic Unit (ALU):
It contains electronic circuit necessary for
performing all the arithmetic and logical operations. All calculations are
performed in the ALU of the computer. It also does comparison and takes decision.
It perform arithmetic calculation like addition, subtraction, multiplication,
division etc. and logical operation like YES/NO and or complement operations
ii.
Control
Unit:
This unit
instructs the computer where to store the input data after receiving from the
users. It also controls the flow of data and instruction from the storage unit to
ALU. The task of control unit is to carry fetch-execute
cycle.
iii.
Register
Array:
It is a memory of the processor used by the processor at
the time of execution and storing temporarily. CPU contains a number of
register like Accumulator, stack pointer and address register etc.
Memory:
Memory is the location where the
data and program of the user are stored. Memory is the main storage unit of the
computer. Memory is of two types (i) Primary and (ii) Secondary memory, In which
primary is volatile and secondary is non-volatile.
Output Unit:
The unit from which the user can
fetch or gain the processed data is called output unit. It includes the peripheral
devices connected to the computer like Printer, Monitor, speaker etc. it helps
user by providing the desired result.
OR
Write a program to input the elements of 4 x 3 matrixes and prints its
elements properly using array.
include
<stdio.h>
int main()
{
int i, j, m, n;
int matrix[10][20];
printf("Enter
number of rows : ");
scanf("%d",
&m);
printf("Enter
number of columns : ");
scanf("%d",
&n);
for (i = 0; i < m;
i++)
{
for (j = 0; j < n;
j++)
{
printf("Enter
data in [%d][%d]: ", i, j);
scanf("%d",
&matrix[i][j]);
}
}
for (i = 0; i < m;
i++)
{
for (j = 0; j < n;
j++)
{
printf("%d\t",
matrix[i][j]);
}
printf("\n");
}
return 0;
2. Draw
AND, OR, XOR and X-NOR gates with truth table and logic gates.
An operator is a special symbol
that indicates the operation to be carried out between two operands. An
operation is an action to be carried out upon operands. There are 3 basic
Boolean Operations: AND, OR and NOT operations.
i. AND Gate:
It is an electronic circuit used to perform logical manipulation and it is denoted by dot operator (.). it The AND Gate contain two or more than to input values which produce only one output value. AND gate produces 1 output when all inputs are 1, otherwise the output will be 0.
The graphical symbol, algebraic expression, truth table and Veen Diagram of AND gate is shown below:
OR Gate:
It is an electronic circuit used to perform logical addition and for that it uses plus operator (+). The OR Gate contains two or more than two input values which produce only one output value. OR gate produces 1 output, when one of the inputs is 1. If inputs are 0, then the output will be also 0. It can be The graphical symbol, algebraic expression, truth table and Venn Diagram of OR gate is as shown below:
iii.
Exclusive
OR (X-OR) Gate:
It is an electronic circuit used
to perform logical “either/ or” operation. It accepts two or more inputs and generates
only one output. It generates high or 1 output when the number of high or 1
input is in odd otherwise it generates low or 0 output.
The graphical symbol, algebraic
expression and truth table of X-OR gate is given below:
iv.
Exclusive
NOR (X-NOR) Gate:
It is an electronic circuit used
to perform logical complement of Exclusive OR operation. It accepts two or more
inputs and generates only one output. It generates high or 1 output when all
the inputs are either high or low otherwise it generates low or 0 output.
The graphical symbol, algebraic expression and truth table of X-NOR gate is shown below:
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