SEE Class 10 Computer Model Questions Answer 2081 (10 Sets)

SEE – Class 10 – Computer Science Model Questions with Solution (SET 2)

SEE Class 10 Computer Science Model Question for the Academic year 2081.

Subject: Opt. II (Computer Science) SET 1

Full Marks: 50 Time: 2:00 hrs
Candidates are required to give their answers according to the instructions.

Attempt all the questions.

Group ‘A’ (10 Marks)

1. Answer the following questions in one sentence: [6×1=6]

a) What is data communication?

Ans: Data communication is the process of transferring data between two or more devices using a transmission medium such as wire or wireless.

b) What is a computer virus?

Ans: A computer virus is malicious software that replicates and infects computers, causing harm.

c) Name two types of data files in Qbasic.

Ans: Twp data files in Qbasic are: i) Sequential data file ii) Random access file

d) What is the primary key?

Ans: A primary key is a unique identifier for each record in a database table.

e) What is a field?

Ans: A field is an individual piece of data or attribute in a database or record, like a name or phone number.

f) What is ‘C’ Language?

Ans: C language is a high-level programming language developed in the early 1970s and widely used for system and application development.

2. Write appropriate technical terms for the following. 2×1=2

a) A network limited to terms of a room or building.

Ans: LAN

b) Commercial transactions through mobile devices.

Ans: M-Commerce

3. Write the full form of the following: 2×1=2

a. UPS: Uninterruptible Power Supply

b. WWW: World Wide Web

4. Answer the following questions: 9×2=18

a. What is transmission media? Write its types.

Ans: Transmission media refers to the physical pathways that enable device communication. Following are the different types of transmission media.

i) Guided communication media. (Twisted pair cable, coaxial cable, fiber optic cable)

ii) Un-guided communication media. (radio waves, microwaves, Bluetooth, etc.)

b. What is IoT? Write any two importance of it.

Ans: IoT, or Internet of Things, is a network of interconnected devices that collect and share data over the Internet.

The following are the two importance of IoT:

i. Enhances everyday life with smart homes, healthcare monitoring, and personalized services, contributing to convenience and well-being.
ii. Enables real-time monitoring and control of devices and systems from remote locations, improving convenience and safety.

c. Write any four opportunities and threats in social media.

Ans: Opportunities of social media:

i. Build relationships, connect with like-minded people, and foster a sense of belonging.
ii. Reach a large audience, promote your business or ideas, and engage with customers.
iii. Share your creativity, learn new things, and discover diverse perspectives.
iv. Mobilize people for a cause, raise awareness, and effect positive change.

Threats of social media:

i. Encountering false information that can be misleading or harmful.
ii. Sharing personal information online can lead to privacy breaches or stalking.
iii. Excessive use can lead to social isolation, anxiety, and depression.
iv. Facing online abuse or negativity that can impact mental well-being.

d. What is E-commerce? Write its types.

Ans: E-commerce refers to buying and selling goods or services using the Internet.

Types of e-commerce include:

i) B2C (Business-to-Consumer)
ii) B2B (Business-to-Business)
iii) C2C (Consumer-to-Consumer)
iv) C2B (Consumer-to-Business)

e. What is information security? Write any two ways to protect data.

Ans: Information security is the practice of protecting electronic data from unauthorized access, use, disclosure, disruption, modification, or destruction.

Two ways to protect data include:

i) Use complex passwords and update them regularly.
ii) Keep software and systems updated to protect against vulnerabilities.

f. What is a database? Write any two examples.

Ans: A database is a well-organized collection of data that is easy to access and manage.

Following are the four examples of DBMS:

i. MS-Access

ii. Oracal

g. What is a table? Write the basic components of the table.

Ans: The table is the object of the database that stores data in rows and columns.

The following are the basic components of a table:

i) Field
ii) Records
iii) Data types
iv) Primary key

h) What is an action query? Write its type.

Ans: An action query in a database is a type of query designed to perform operations that modify or manipulate the data in the database.

Following are the types of action queries:

i) Delete query
ii) Append query
iii) Update query
iv) Make-table query

i) Define input mask and validation rule.

Ans: Input mask: An input mask is a template that specifies the format in which data must be entered into a database field.

Validation rule: A validation rule is a criterion that limits the type or range of data that can be entered into a database table’s fields.

5. Write the output of the given program. Show with a dry run in the table. 2

DECLARE SUB series ()

CLS

CALL series

END

SUB series

a=4

b=5

PRINT a

PRINT b

FOR i= 1 to 5

c=a+b

PRINT c

a=b

b=c

NEXT i

END SUB

Class

Var. a	Var b	Print a,b	Loop check?	Var c	Print c
4	5	4 5	1 to 5? Yes	C=4+5=9	9
5	9		2 to 5? Yes	C=5+9=14	14
9	14		3 to 5? Yes	C=9+14=23	23
14	23		4 to 5? Yes	C=14+23=37	37
23	37		5 to 5? yes	C=23+37=60	60
37	60		6 to 5? No Exit from loop

The final output:

4
5
9
14
23
37
60
Answer

6. Re-write the given program after correcting the bug: 2

REM add some more records on a sequential data file "emp.dat"

CLS

OPEN "emp.dat" for INPUT AS #1

UP:

INPUT "Enter name";n$

INPUT "Enter Department";d$

INPUT "Enter post";p$

INPUT "Enter salary";sl

WRITE #2, n$,d$,p$,sl

INPUT "Do you want to add more records? (Y/N)"ans

IF UCASE$(ans$)="Y" THEN GOTO UP

CLOSE

END

Ans: Debugged program:

REM adds more records on a sequential data file, “emp.dat.”

CLS

OPEN "emp.dat" for APPEND AS #1

UP:

INPUT "Enter name";n$

INPUT "Enter Department";d$

INPUT "Enter post";p$

INPUT "Enter salary";sl

WRITE #1, n$,d$,p$,sl

INPUT "Do you want to add more records? (Y/N)"ans$

IF UCASE$(ans$)="Y" THEN GOTO UP

CLOSE #1

END

7. Study the following program and answer the given questions: 2×1=2

DECLARE FUNCTION test$ (a$)

CLS

a$="KATHMANDU"

b$=test$(a$)

PRINT b$

END

FUNCTION test$(a$)

FOR i= 1 TO LEN(a$)

d$=MID$(a$,I,1)

IF I MOD 2= 0 HEN

c$=c$+UCASE$(d$)

ELSE

c$=c$+LCASE$(d$)

ENDIF

test$=c$

END FUNCTION

a. What is the name of the function procedure?

Ans: test$

b. List the different library functions used in the program.

Ans: LEN, MID$, LCASE$, UCASE$

8. Convert/Calculate as per the instructions: 4×1=4

i) (511)10 into binary

To convert 511 (decimal) into binary:

Divide by the base 2 to get the digits from the remainder:

Division by 2	Quotient	Remainder(Digit)	Bit #
(511)/2	255	1	0
(255)/2	127	1	1
(127)/2	63	1	2
(63)/2	31	1	3
(31)/2	15	1	4
(15)/2	7	1	5
(7)/2	3	1	6
(3)/2	1	1	7
(1)/2	0	1	8

So, (511)₁₀ = 111111111₂

ii) (756)10 into Hexadecimal number

To convert 756 (decimal) into hexadecimal:
756 ÷ 16 = 47 remainder 4
47 ÷ 16 = 2 remainder 15 (F)
2 ÷ 16 = 0 remainder 2

So, (756)₁₀ = 2F4₁₆

iii) 1001×101-11

Step 1: Binary Multiplication

1001
×  101
------
  1001    (1001 × 1)
 0000     (1001 × 0 shifted left)
1001      (1001 × 1 shifted left twice)
------
1100101

1001 × 101 = 1100101

Step 2: Binary Subtraction
1100101 – 11
Convert 11 into 6 bits = 000011
1100101 – 0000011 = 1100010

So, the result is 1100010₂

iv) 1001001÷11001

Step 1: Convert to Decimal
1001001 = 73
11001 = 25

Step 2: Division
73 ÷ 25 = 2 remainder 23

Step 3: Convert the Result to Binary
2 = 10₂
23 = 10111₂

Final Answer: Division:10, Rem: 10111

9.a) Write a program in Qbasic that asks the radius and height of a cylinder, then calculates its volume and total surface area. Create a user-defined function VLM(r,h) to calculate volume and sub-procedure TOTSA(r,h) to calculate the total surface area of a hemisphere. [Hints: TSA=2πr(r+h), V=πr²h] 4

Ans:

DECLARE FUNCTION vlm (r, h)

DECLARE SUB tosta (r, h)

CLS

INPUT "Enter radius and height"; r, h

PRINT  "Volume: ";vlm(r, h)

CALL tosta(r, h)

END

SUB tosta (r, h)

v = 22 / 7 * r * r * h

PRINT " Surface area of a hemisphere";v

END SUB

FUNCTION vlm (r, h)

tsa = 2 * 22 / 7 * r * (r + h)

vlm = tsa

END FUNCTION

b) A sequential data file called “marks.dat” has stored data under the field heading students name, Eng, Nep, and Math. Write a program to display all the records whose marks is greater than 35 in all subjects. 4

Ans:

CLS

OPEN "marks.dat" FOR INPUT AS #1

DO WHILE NOT EOF(1)

INPUT #1, name$,eng,math,nep

IF eng>=35 AND math>=35 AND nep>=35 THEN PRINT name$,eng,math,nep

LOOP

CLOSE #1

END

10. Write a program in C language to ask to enter a number then find out whether it is odd or even. 4

#include <stdio.h>

int main()

{

    int number;

    printf("Enter a number: ");

    scanf("%d", &number);

     if(number %2==0)

printf("even number");

            else

            printf("odd number");

        return 0;

}

Write a C program to display the sum of the first 20 even numbers. 4

#include<stdio.h>

int main()

{

            int x,a=2;

            for(x=1;x<=20;x++)

            {

                        printf("%d\t",a);

                        a=a+2;

            }

            return 0;

}