PABSON, Kathmandu
SEE PRE-QUALIFYING EXAMINATION-2080
Subject:
Opt. II Computer Science
Class:
10
Full Marks: 50
Time:
2 hrs.
Candidates
are required to write their answers according to the instructions given.
Attempt
all questions.
(Group 'A' 10×1=10)
1.
Answer the following questions in one sentence: (6x1=6)
a)
Give reason in short that "Computer network reduces the cost of
operation."
Ans: Computer network
reduces the cost of operation by sharing hardware and software.
b)
List some areas where Al can help us.
Ans: Robotics and
Education
c)
Write opportunities and threats in social media.
Ans: Opportunities of
social media is It
creates awareness and innovate the way people live and Threats of social media
is personal data and privacy can be easily hacked and shared on the internet.
d)
What is primary key?
Ans: A
primary key is a field or combination of fields in a table that uniquely
identifies each record, and is used to establish relationships between tables
and enforce data integrity.
e)
What is local and global variable in QBASIC?
Ans: Variables which
are declared inside the procedure and its value is protected from outside
interference is called local variables. Variables which are declared outside
the procedure and its
values can be accessed from any procedure or module.
is called global
variables.
f)
Write any two format specifier used in C language.
Ans: int - %d, and float
- %f
2.
Write appropriate technical term for the following: (2x1=2)
a) Device used to connect
a PC with a telephone line. MODEM
b) Law that governs the
legal issues of cyberspace. Cyber Law
3.
Write the full form of the following: (2x1=2)
a) GPS: Global
Positioning System
b) TCP/IP : Transmission Control Protocol / Internet
Protocol
(Group
'B')
4.
Answer the following questions: (9x2=18)
a)
Write advantages and disadvantages of bus topology.
Advantages
of bus topology
-It
is the easiest network topology for connecting peripherals or computers in a linear
fashion.
-The
length of cable required is less than a star topology
Disadvantages
of bus topology:
-
Troubleshooting individual device issues is very hard.
-If
the main cable is damaged, the whole network fails or splits into two.
b)
What are the elements of digital citizenship?
Ans The elements of
digital citizenship are:
- Digital access
-Digital commerce
- Digital communication
- Digital literacy
- Digital etiquette
- Digital law
-Digital rights and responsibilities
-Digital health and wellness
c)
Differentiate between traditional commerce and e-commerce.
Traditional commerce
refers to the commercial transactions or exchange of information, buying or
selling product/services from person to person without use of internet which is
a older method of business style and comes under traditional business. Now a days
people are not preferring this as it is time taking and needs physical way of
doing business. Example includes physical market/bazaar.
E-commerce refers to the
commercial transactions or exchange of information, buying or selling
product/services electronically with the help of internet which is a newer
concept of business style and comes under e-business. Now a days people are
preferring this as it is less time taking and does not need physical way of
doing business everything can be done with laptop or smartphone and internet.
Example includes online shopping sites.
d)
Define cloud computing? Name any two services of it.
Cloud Computing
refers to storing and accessing data and programs over the internet instead of
storing on secondary storage devices.
Any two servicecs of it are
Infrastructure as a Service (IaaS): Customer can use
processing, storage, networking, and other computing resources from cloud
service providers to run their software system.
Software as a Service (SaaS): Customer
subscribes the software services from a vendor for an annual subscription fee
or sometimes free and use it over Internet.Services like Gmail, Google Drive,
Office 365 are some of the examples of SaaS.
e)
What is power protection device? Write its role in computer security.
Ans: Power protection
device is device that control the voltage fluctuation and supply required
amount of power to the respective device. Its role in computer security is to keep
data and programs safe.
f)
Differentiate between data and information.
Ans: Data are raw facts
that is meaning less whereas information are meaningful and gives us clear
meaning.
g
) What are field properties? Name any four of them.
Ans: Field Properties
sets boundaries on what/how data is entered into table fields. Field size,
caption, input mask, validation rule etc are the examples of field properties.
h)
What are validation text and validation rules?
Ans: A validation rule is
one way to restrict input in a table field or a control (such as a text box) on
a form. Validation text lets you provide a message to help users who input data
that is not valid.
i)
List any two major differences between forms and reports.
Ans: Forms can be used
for both input and output. Reports, on the other hand, are used for output,
i.e., to convey information on a collection of items. Typically, forms contain
data from only one record, or are at least based on one record such as data
about one student, one customer, etc.
5.
Write down the output of the given program. (2)
Show
with dry run in table.
DECLARE SUB SERU ( )
CLS
CALL SERU
END
SUB SERU ()
X=2
C=1
WHILE C<=10
S=X^C
PRINT S;
C-C+1
WEND
END SUB
Dry
Run
|
X |
C |
WHILE C<=10 |
S=X^C |
PRINT S |
|
2 |
1 |
1 |
2^1=2 |
2 |
|
|
2 |
2 |
2^2=4 |
4 |
|
|
3 |
3 |
2^3=4 |
8 |
|
|
4 |
4 |
2^4=4 |
16 |
|
|
5 |
5 |
2^5=4 |
32 |
|
|
6 |
6 |
2^6=4 |
64 |
|
|
7 |
7 |
2^7=4 |
128 |
|
|
8 |
8 |
2^8=4 |
256 |
|
|
9 |
9 |
2^9=4 |
512 |
|
|
10 |
10 |
2^10=4 |
1024 |
Output
of the program is
2 4 8 16 32
64 128 256
512 1024
6.
Re-write the given program after correcting the bugs: (2)
REM to store Name, post
and salary
OPEN EMP.DOC FOR OUT AS #1
INPUT "Enter
name"; N
INPUT "Enter
post"; PS
INPUT "Enter
salary"; S
INPUT #2, NS, P$, S
CLOSE #1
STOP
Debugged
Program
REM to store Name, post
and salary
OPEN "EMP.DOC" FOR OUTPUT
AS #1
INPUT "Enter
name"; N$
INPUT "Enter post
"; P$
INPUT "Enter
salary"; S
WRITE
#1, N$, P$, S
CLOSE #1
END
7.
Study the following program and answer the given questions: (2×1=2)
DECLARE FUNCTION COUNT (NS)
INPUT "Enter a
word"; RS
C=COUNT(RS)
PRINT C
END
FUNCTION COUNT(NS)
FOR K=1 TO LEN(NS)
XS=MIDS(NS,K,1)
IF UCASES(XS)="A"
THEN
X=X+1
END IF
NEXT K
COUNT=X
END FUNCTION
Questions:
a)
List any two library functions used in above program.
Ans: Two library
functions used in above program are UCASE$( ) and MID$( )
b)
Write the use of variable "C" in line 3 [i.e. C=COUNT(RS)] given in
the above program.
Ans: The use of variable
"C" in line 3 [i.e. C=COUNT(RS)] is to store the value returned by
COUNT(RS) function.
(Group 'C’)
8.
Convert/calculate as per the instruction: (4x1=4)
i) (101101 + 1101) - (11011)
ii) (10111 × 11) ¸ (110)
iii) (329) into octal
iv) (DA3)16 into binary
9.
a) Write a program in QBASIC that allow user to enter radius of a circle.
Create user define FUNCTION...END FUNCTION to find area of circle and SUB...END
SUB to find volume of a cylinder. (4)
DECLARE FUNCTION AREA(R)
DECLARE SUB VOLUME(R, H)
CLS
INPUT "Enter the
value of radius"; R
INPUT "Enter the value of height"; H
PRINT “Area of Circle”; AREA(R)
CALL VOULME(R, H)
END
FUNCTION AREA(R)
AREA = 22/7 * R ^ 2
END FUNCTION
SUB VOLUME(R, H)
V = 22/7 * R ^2 * H
Print "Volume of a
cylinder is";V
END SUB
b)
A sequential data file called "record'txt" has stored data under the
field heading Roll No., Name, Gender, English, Nepali, Maths and Computer. WAP
to display all the information of those students whose gender is ‘F’ and obtain
mark in computer is more than 90. (4)
OPEN
"record.txt" FOR INPUT AS #1
WHILE NOT EOF (1)
INPUT #1, roll, N$, G$,
E, N, М, С
IF UCASES(G$) =
"F" and C>90 THEN
PRINT roll, N$, GS, E, N,
M. C
END IF
WEND
CLOSE #1
END
10.
Write a program in 'C' language to check whether the supplied number is
divisible by 5 or not.
#include<stdio.h>
#include<conio.h>
void main( )
{
int a;
printf(“Enter any number”);
scanf("%d",
&a);
if (a % 5 = = 0)
{
printf("It is
Divisible by 5");
}
else
{
printf("It is not
Divisible by 5");
}
getch( );
}
or
Write
a program C } language to display the series with their sum. 2,4,6,8......, up
to 10th terms
#include<stdio.h>
#include<conio.h>
void main()
{
int a=2,i;
for (i=1;i<=10;i++)
{
Printf(“%d \t”, a);
s=s+a;
a=a+2;
}
printf("sum =
%d",s);
getch( );
}
