SEE Examination 2068
Computer Science
 
Group “A”
Computer Fundamental [22 marks]
 
1. Answer the following questions. (2x5=10)
    a. Define LAN topology and write any two types of LAN topology.
Ans: The arrangement or connection pattern of computers or nodes and other devices of the network is known as LAN topology.
Any two types of LAN topology are
·   Bus topology
·   Star topology
b. Write any four services of Internet.
Ans: The four services of internet are
·   E-mail (Electronic mail)
·   FTP (File Transfer Protocol)
·   IRC (internet Relay Chat)
·   E-commerce
c. Write any two advantages of multimedia in education field.
Ans: The two ad advantages of multimedia in education field are listed below:
·   It makes teaching/learning easier in classroom.
·   It helps to make attractive presentation on any topic.
d. Write any two software security measures.
Ans: The two software security measures are:
·   Backup
·   Password
e. Write any four symptoms that show, computer is infected by computer virus.
Ans: The four symptoms that show, computer is infected by computer virus are listed below:
·   Program takes long time to load.
·   Computer becomes slow and hang.
·   Increased use of disk space and growth in file size.
·   Irritating messages will pop up.
 
2. a. Convert as indicated. (1x2=2)
     i. (108)₁₀ into binary
Soln:

2	108	Rem
2	54	0
2	27	0
2	13	1
2	6	1
2	3	0
2	1	1
2	0	1

      
 
           
 
 
Therefore: (108)₁₀ = (1101100)₂
 
 
ii. (173)₈ into binary
Soln:
     Octal            1          7         3
     Binary         001      111      011
Therefore: (173)₈ = (1111011)₂
 
b. Binary calculation. (1x2=2)
i. 111 x11
    Soln:
     1      1          1
     x      1          1
     1      1          1
+ 1       1   1     x
1     0    1     0     1
 
:. 111x11=10101
 
ii.1010-10+11
Soln:
       1 0 1 0
-               1 0
1 0 0  0
+     1  1
 1 0 1 1
 
:. 1010-10+11=1011
    
3. Match the following. (0.5x4=2)
Group A                    Group B
a. Microwave          Multimedia
b. Volt guard           Protocol
c. Sound card          Unguided media
d. TCP/IP                 Power protection devices
                                Guided media
Answers
Group A                      Group B
a. Microwave          Unguided media
b. Volt guard           Power protection devices
c. Sound card          Multimedia
d. TCP/IP                 Protocol       
                                        
4. Select the best answers. (0.5x4=2)
    a. Which of the following is not a protocol?
         i. POP     ii. TCP/IP         iii. NOS                       iv. FTP
 
   b. Which device protects hardware?
         i. UPS     ii. MODEM      iii. Gateway     iv. All of the above
 
    c. In which communication media data transfer high?
         i. Twisted pair     ii. Co-axial cable         iii. Fiber optics     iv. Microwave
 
    d. Which computer virus damages the master boot record?
         i. Macro virus     ii. File virus     iii. New folder virus           iv. Boot sector virus
 
 
5. Write the appropriate technical terms. (0.5x4=2)
a.   The device used to connect PC with telephone line. MODEM
b.   The rules that make the network communication possible. Protocol
c.    A program that effect the normal functioning of computer. Computer Virus
d.   A main computer in the computer network. Server




1.   Match the following. (0.5x4=2)
a.   Bps              bits per second
b.   MAN           Metropolitan Area Network
c.    FTP              File Transfer Protocol
d.   URL              Uniform Resource Locator
 
Group B-Database (10 marks)
 
7. Answer the following questions. (2x3=6)
a. What is database?
Ans: The organized collection of related data in a systemic manner is called a database.
b. What is data sorting?
Ans: Data sorting means grouping all the records in a table either in ascending or descending order based on a key field of the record.
c. What is a form?
Ans: Form is an object of MS-Access which provides a user friendly interface to enter, edit, update and delete data in a table or multiple linked tables.
 
 
8. Select the best answers.  (0.5x4=2)
     a. ………………. Is not a data type of MS-Access.
       i. Number             ii. Text             iii. Memo         iv. Form
 
    b. Primary key does not accept ……….
        i. Text                  ii. Number       iii. Null value   iv. None of the above
 
     c. ……………….. object of access is used to print formatted data.
        i. Query               ii. Form             iii. Report        iv. Table
 
     d. In MS-Access data are stored in ………………
        i. Form                 ii. Query          iii. Table          iv. All of the above
 
9. Match the following. (0.5x4=2)
Group A                     Group B
a.   Indexing                Limits the value
b.   Report                   Data type
c.    Validation Rule     Error message
d.   Hyper link              Final output
Search fast
 
Answers
Group A                     Group B
a.   Indexing                  Search fast   
b.   Report                     Final output
c.    Validation rule      Limits the value
d.   Hyper link              Data type            

Group C- Programming (18 marks)
10. Answer the following questions. (2x5=10)
a. What is loop?
Ans: Loop means executing a statement or group of statements a certain number of times depending upon the condition.
b. List any two data types supported by ‘C’ language.
Ans:Any two data types supported by ‘C’ language are:
·            char
·            int
c. State the function of the following statement:
           i. EOF    It checks whether the record in the file has end or not.
ii. MKDIR: It creates a sub directory which is used to manage files.
 
11. Re-write the given program after correcting the bugs. (0.5x4=2)
CREATE FUNCTION Square(A)
Rem to print square of a number
CLS
Get “a number”; A
CALL square(A)
END
FUNCTION square(A)
Ans=A^2
Square=Ans
END Square(A)

Debugged Program
DECLARE  FUNCTION Square(A)
Rem to print square of a number
CLS
INPUT “Enter a number”; A
PRINT square(A)
END
FUNCTION square(A)
Ans = A^2
Square = Ans
END FUNCTION

 
12. Write the output of the given program. (2)
DECLARE SUB Series ()
CALL Series
END
SUB Series ()
A=2
B=2
FOR ctr = 1 TO 2
PRINT A; B;
A=A+B
B=A+B
NEXT ctr
END SUB
OUTPUT: 2            2          4          6
 
13. Analyze the program given below and answer the questions. (1x2=2)
DECLARE FUNCTION count(N$)
INPUT “Enter a word”; N$
C= Count(N$)
PRINT C
END
FUNCTION count(N$)
FOR k=1 TO LEN(n$)
X$=MID$(N$,K,1)
IF UCASE$(X$)=”A” THEN
X=X+1
END IF
NEXT K
Count = X
END FUNCTION
a. List any two library functions used in the above program.
Ans: The two library functions used in the above program are
·   UCASE$( )
·   MID$( )
 
b. Write the use of variable ‘C’ inline 3 [i.e. C=Count(R$)] given in the above program.
Ans: The use of variable ‘C’ inline 3 [i.e. C=Count(R$)] given in the above program is to call the function and store the value returned by the function count.
 

14. a. Write a program to calculate the area of four walls using SUB…END SUB.  (3)

            DECLARE SUB AREA (L, B, H)

            CLS

            INPUT “ENTER LENGTH”; L

            INPUT “ENTER BREADTH”; B

            INPUT “ENTER HEIGHT”; H

            CALL AREA (L, B, H)

            END

            SUB AREA (L, B, H)

            A = 2 * H * (L + B)

            PRINT “AREA OF FOUR WALLS =”; A

            END SUB

 
b. Write a program using FUNCTION…...END FUNCTION to get a word from the user and print it in reverse order. (3)
DECLARE FUNCTION REVERSE$ (S$)
CLS
INPUT "ENTER ANY WORD"; S$
PRINT "REVERSED WORD IS "; REVERSE$(S$)
END
FUNCTION REVERSE$ (S$)
FOR I = LEN(S$) TO 1 STEP -1
B$ = MID$(S$, I, 1)
W$ = W$ + B$
NEXT I
REVERSE$ = W$
END FUNCTION
c. A sequential data file called “student.dat” contains some records under the field’s name, English, Nepali and Computer. Write a program to add some more records in the same sequential data file. (3)
OPEN “student.dat” FOR APPEND AS #1
DO
CLS
INPUT “ENTER NAME”; N$
INPUT “ENTER MARKS IN ENGLISH”; E
INPUT “ENTER MARKS IN NEPALI”; N
INPUT “ENTER MARKS IN COMPUTER”; C
WRITE #1, N$, E, N, C
INPUT “DO YOU WANT TO CONTINUE? (Y/N)”; CH$
LOOP WHILE UCASE$(CH$) = “Y”
CLOSE #1
END