SLC 2072 COMPUTER SCIENCE SOLVED PAPER
Group - A
(Computer fundamentals)
1. Answer
the following questions.
a) Define
LAN topology. Draw star topology.
Ans: The arrangement or connection pattern of nodes or computers
and other devices of the network is called LAN topology.
b) Give
any two symptoms of virus attacks.
Ans: The symptoms of virus attacks are:
i) Program
takes more time to load, fail to load or hang frequently.
ii) Unexpected
messages or images appear suddenly on the screen.
c) Write
one advantage and one disadvantage of multimedia.
Ans: The advantage of multimedia is:
i) One
can present ideas, information to others in effective ways.
The disadvantage of multimedia is:
i) The cost of developing a multimedia
product is high.
d) Write
any two ways of protecting computer software.
Ans: The two ways of protecting computer software are:
i)Antivirus Software
ii)Backup System
e) Write
any two services of internet.
Ans: The two services of internet are:
i) WWW (World Wide Web)
ii)E-mail
2. a)Convert
as indicated:
i)(208)10 into Binary
Converting decimal to binary,
2
|
208
|
|
2
|
104
|
0
|
2
|
52
|
0
|
2
|
26
|
0
|
2
|
13
|
0
|
2
|
6
|
1
|
2
|
3
|
0
|
|
1
|
1
|
(208)10=(11010000)2
ii)(104)8 into decimal
Converting octal to decimal,
=1*82+0*81+4*80
=1*64+0*8+4*1
=64+0+4
=68
(104)8=(68)10
b) Perform the binary calculations:
i)1011+1101
1011
+ 1101
11000
1011+1101=11000
ii)110*11
110
*11
110
+ 110x
10010
110*11=10010
3. Match
the following:
Answers:
a) Microwave
: Unguided media
b) UTP
: Guided media
c) UPS
: Power protection
device
d) SMTP
: Protocol
4. State
whether the following statements are true or false:
a) Walky-talky
is an example of full duplex mode.
Ans: False
b) Data
transfer rate is higher in optical fiber cable than in co-axial cable.
Ans: True
c) The
computer security refers to hardware security only.
Ans: False
d) Sound
Card is one of the components of multimedia.
Ans: True
5. Write
the appropriate technical terms of the following:
a) A
program that can disinfect a file from virus.
Ans: Antivirus software
b) A
person who steals or destroys other’s data, information, files and program.
Ans: Hacker
c) A
company which provides the internet facilities.
Ans: ISP (Internet Service Provider)
d) A
computer which provides services to other computers in a network.
Ans: Server Computer
6. Write
the full forms of:
i)URL
: Uniform Resource Locator
ii)HTTP
: HyperText Transfer Protocol
iii)LAN
:Local Area Network
iv)MODEM :Modulator-Demodulator
Group – B
(Database)
7. Answer
the following questions:
a) Write
any four data types used in Ms-ACCESS.
Ans: Four data types used in Ms-ACCESS are:
i) Text ii) Number iii) Currency iv) Date/Time
b) Define
database with example.
Ans: The systematic collection of organized and related
information that can be used for different purposes is called database. For
example: dictionary and telephone directory.
c) What
is query?
Ans: A query is one of the objects of MS-Access that allows us
to retrieve the desired information from a table or multiple linked tables.
8. State
whether the following statements are true or false:
a) A
query is used to select fields and records from only one table.
Ans: False
b) MS-ACCESS
is DBMS software.
Ans: True
c) Index
decreases the speed of query and sort operations.
Ans: False
d) Data
in primary key has to be unique and not null.
Ans: True
9. Match
the following:
a) OLE
: Data type
b) Validation
Rule
:
Limits the value
c) Form
: Data Entry
d) Indexing
: Easy to search
Group - C
( Programming)
10. a) What is
procedure?
Ans: The separate block of statements used by the module level
code and called by any number of times is called procedure.
b) Write any two data types used in ‘c’ language.
Ans: The two data types used in the ‘c” language are:
i) int ii) float
c) Write down the functions of the following statements:
i) OPEN: It opens a sequential file for one of the three
possible operations i.e. reading, writing or appending.
ii) MKDIR: It makes or creates a new directory on the specified
disk.
11. Re-write
the following program after correcting the bugs:
FUNCTION SUM(m,n)
Rem to print sum of two numbers
a=6
b=7
DISPLAY SUM(a,b)
END
FUNCTION SUM(m,n)
S=m+n
S=SUM
END SUM
Debugged program:
DECLARE FUNCTION SUM(m,n)
Rem to print sum of two numbers
a=6
b=7
PRINT SUM(a,b)
END
FUNCTION SUM(m,n)
S=m+n
SUM=S
END FUNCTION
12. Write the
output of the following program:
DECLARE FUNCTION Interest(p,t,r)
CLS
LET p=100
LET t=2
LET r=5
LET d=Interest(p,t,r)
PRINT “The simple interest=”;d
END
[possible missing code………]
FUNCTION Interest (p,t,r)
Interest=(p*t*r)/100
End FUNCTION
OUTPUT
If the sub module is missing then error message will be
displayed.
Otherwise : The Output will be:
The simple interest = 10
13. Study the
following program and answer the following questions:
DECLARE FUNCTION Prod(N)
INPUT “Any number”;N
X=Prod(N)
PRINT X
END
FUNCTION Prod(N)
F=1
FOR K=1 TO N
F=F*K
NEXT K
Prod=F
END FUNCTION
a) Write
the name of the user defined function used in the above program.
Ans: The name of the user defined function used in
the above program is Prod.
b) Name
the loop in the above program.
Ans: The loop in the above program is FOR…NEXT.
14. a) Write a
program using SUB…..END SUB to display reverse of input-string.
DECLARE SUB REV(A$)
CLS
INPUT “ENTER ANY STRING”;A$
CALL REV(A$)
END
SUB REV(A$)
FOR I= 1 TO LEN(A$)
B$=MID$(A$,I,1)
W$=B$+W$
NEXT I
PRINT “REVERSED STRING=”W$
END SUB
b) Write a program using FUNCTION…END FUNCTION to find area of
the triangle.
DECLARE FUNCTION AREA(B,H)
CLS
INPUT “ENTER BASE”;B
INPUT “ENTER HEIGHT”;H
PRINT “AREA OF TRIANGLE”;AREA(B,H)
END
FUNCTION AREA(B,H)
AREA=0.5*B*H
END FUNCTION
c) A
sequential data file called “Marks.dat” contains NAME, AGE, CITY, and TELEPHONE
fields. Write a program to display all the contents of the data file.
OPEN “Marks.dat” FOR INPUT AS #1
CLS
DO WHILE NOT EOF(1)
INPUT #1, N$, A, C$, T#
PRINT N$, A, C$, T#
LOOP
CLOSE #1
END
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