Class XII – Informatics Practices Practice Paper – 1 – Answers

Subject: Informatics Practices

Class XII

Time: 3 hours

Max. Marks: 70

General Instructions:

1. This question paper contains five sections, Section A to E.

2. All questions are compulsory.

3. Section A have 18 questions carrying 01 mark each.

4. Section B has 07 Very Short Answer type questions carrying 02 marks each.

5. Section C has 05 Short Answer type questions carrying 03 marks each.

6. Section D has 03 Long Answer type questions carrying 05 marks each.

7. Section E has 02 questions carrying 04 marks each. One internal choice is given in Q35 against part c only.

8. All programming questions are to be answered using Python Language only.

PART – A

1. Television cable network is an example of:

i. LAN

 ii. WAN

iii. MAN

iv. Internet

2. Which of the following is not a type of cyber-crime?

i. Data theft

ii. Installing antivirus for protection

iii. Forgery

iv. Cyber bullying

3. What is an example of e-waste?

i. A ripened mango

ii. Unused old shoes

iii. Unused old computers

iv. Empty cola cans

4. Which type of values will not be considered by SQL while executing the following statement?

SELECT COUNT(column name) FROM inventory;

i. Numeric value

ii. text value

iii. Null value

iv. Date value

5. If column “Fees” contains the data set (5000,8000,7500,5000,8000), what will be the output after the execution of the given query?

SELECT SUM (DISTINCT Fees) FROM student;

i. 20500

ii. 10000

iii. 20000

iv. 33500             

6. ‘O’ in FOSS stands for:

i. Outsource

ii. Open

iii. Original

iv. Outstanding

7. Which SQL statement do we use to find out the total number of records present in the table ORDERS?

i. SELECT * FROM ORDERS;

ii. SELECT COUNT (*) FROM ORDERS;

iii. SELECT FIND (*) FROM ORDERS;

iv. SELECT SUM () FROM ORDERS;

8. Which one of the following is not an aggregate function?

i. ROUND()

ii. SUM()

iii. COUNT()

iv. AVG()

9. Which one of the following functions is used to find the largest value from the given data in MySQL?

i. MAX( )

ii. MAXIMUM( )

iii. BIG( )

iv. LARGE( )

10. To display last five rows of a series object ‘S’, you may write:

i. S.Head()

ii. S.Tail(5)

iii. S.Head(5)

iv. S.tail()

11. Which of the following statement will import pandas library?

i. Import pandas as pd

ii. import Pandas as py

iii. import pandas as pd

iv. import panda as pd

12. Which of the following can be used to specify the data while creating a DataFrame?

i. Series

ii. List of Dictionaries

iii. Structured ndarray

iv. All of these

13. Which amongst the following is not an example of a browser?

i. Chrome

ii. Firefox

iii. Avast

iv. Edge

14. In SQL, which function is used to display current date and time?

i. Date ()

ii. Time ()

iii. Current ()

iv. Now ()

15. Legal term to describe the rights of a creator of original creative or artistic work is:

i. Copyright

ii. Copyleft

iii. GPL

iv. FOSS

16. __________is the trail of data we leave behind when we visit any website (or use any online application or portal) to fill-in data or perform any transaction.

i. Offline phishing

ii. Offline footprint

iii. Digital footprint

iv. Digital phishing

17. Assertion (A): – Internet cookies are text files that contain small pieces of data, like a username, password and user’s preferences while surfing the internet.

Reason (R): – To make browsing the Internet faster & easier, its required to store certain information on the server’s computer.

i. Both A and R are true and R is the correct explanation for A

ii. Both A and R are true and R is not the correct explanation for A

iii. A is True but R is False

iv. A is false but R is True

18. Assertion (A): – DataFrame has both a row and column index.

Reason (R): – A DataFrame is a two-dimensional labelled data structure like a table of MySQL.

i. Both A and R are true and R is the correct explanation for A

ii. Both A and R are true and R is not the correct explanation for A

iii. A is True but R is False

iv. A is false but R is True

PART B

19. Explain the terms Web page and Home Page.

Ans. Web Page: A Web Page is a part of a website and is commonly written in HTML. It can be accessed through a web browser.

Home Page: It is the first web page you see when you visit a website.

OR

Mention any four networking goals.

Ans. Four networking goals are:

i. Resource sharing

ii. Reliability

iii. Cost effective

iv. Fast data sharing

20. Rashmi, a database administrator needs to display house wise total number of records of ‘Red’ and ‘Yellow’ house. She is encountering an error while executing the following query:

SELECT HOUSE, COUNT (*) FROM STUDENT GROUP BY HOUSE WHERE HOUSE=’RED’ OR HOUSE= ‘YELLOW’;

Help her in identifying the reason of the error and write the correct query by suggesting the possible correction (s).

Ans. The problem with the given SQL query is that WHERE clause should not be used with Group By clause.

To correct the error, HAVING clause should be used instead of WHERE.

Corrected Query:

SELECT HOUSE, COUNT(*) FROM STUDENT GROUP BY HOUSE HAVING HOUSE= ‘RED’ OR HOUSE=’YELLOW’;

21. What is the purpose of Order By clause in SQL? Explain with the help of suitable example.

Ans. Order By clause:

The ORDER BY command is used to sort the result set in ascending or descending order.

The following SQL statement displays all the customer’s names in alphabetical order:

SELECT Cname FROM Customers ORDER BY Cname;

22. Write a program to create a series object using a dictionary that stores the number of students in each house of class 12D of your school.

Note: Assume four house names are Beas, Chenab, Ravi and Satluj having 18, 2, 20, 18 students respectively and pandas library has been imported as pd.

Ans. St={‘Beas’ :18, ‘Chenab’ :20 , ‘ Ravi’ :20, ‘ Satluj’ :18}

S1=pd.Series(St)

23. List any four benefits of e-waste management.

Ans. The e-waste management

i. Saves the environment and natural resources

ii. Allows for recovery of precious metals

iii. Protects public health and water quality

iv. Saves landfill space

OR

Mention any four net etiquettes.

Ans. i. No copyright violation

ii. Share the expertise with others on the internet

iii. Avoid cyber bullying

iv. Respect other’s privacy and diversity

24. What will be the output of the following code:

>>>import pandas as pd

>>>A=pd.Series(data=[35,45,55,40])

>>>print(A>45)

Ans.

25. Carefully observe the following code:

import pandas as pd

Year1={‘Q1′:5000,’Q2′:8000,’Q3′:12000,’Q4’: 18000}

Year2={‘A’ :13000,’B’:14000,’C’:12000}

totSales={1:Year1,2:Year2}

df=pd.DataFrame(totSales)

print(df)

Answer the following:

i. List the index of the DataFrame df

ii. List the column names of DataFrame df.

Ans. i. The index labels of df will include Q1, Q2, Q3, Q4, A, B, C

ii. The column names of df will be: 1, 2

SECTION C

26. Write outputs for SQL queries (i) to (iii) which are based on the given table PURCHASE:

i. SELECT LENGTH(CNAME) FROM PURCHASE WHERE QUANTITY>100;

Ans. 8

ii. SELECT CNAME FROM PURCHASE WHERE MONTH(DOP)=3;

Ans. No output

iii. SELECT MOD (QUANTITY, DAY(DOP)) FROM PURCHASE WHERE CITY= ‘CHANDIGARH’;

Ans. 0

15

27. Write a Python code to create a DataFrame with appropriate column headings from the list given below:

[[101,’Gurman’,98],[102,’Rajveer’,95],[103,’Samar’ ,96],[104,’Yuvraj’,88]]

Ans. import pandas as pd

data=[[101,’Gurman’,98],[102,’Rajveer’,95],[103,’Samar’ ,96], [104,’Yuvraj’,88]]

df=pd.DataFrame(data,columns=[‘Rno’,’Name’, ‘Marks’])

28. Consider the given DataFrame ‘Stock’:

Write suitable Python statements for the following:

i. Add a column called Special_Price with the following data: [135,150,200,440].

Ans. Stock[‘Special_Price’]=[135,150,200,400]

ii. Add a new book named ‘The Secret’ having price 800.

Ans. Stock.loc[‘4’]=[‘The Secret’,800]

iii. Remove the column Special_Price.

Ans. Stock=Stock.drop(‘Special_Price’,axis=1)

29. Nadar has recently shifted to a new city and school. She does not know many people in her new city and school. But all of a sudden, someone is posting negative, demeaning comments on her social networking profile etc.

She is also getting repeated mails from unknown people. Every time she goes online, she finds someone chasing her online.

i. What is this happening to Nadar?

Ans. Nadar has become a victim of cyber bullying and cyber stalking.

ii. What immediate action should she take to handle it?

Ans. She must immediately bring it into the notice of her parents and school authorities. And she must report this cyber crime to local police with the help of her parents.

iii. Is there any law in India to handle such issues? Discuss briefly.

Ans. Yes. The Information Technology Act, 2000 (also known as ITA-2000, or the IT Act) is the primary law in India dealing with cybercrime and electronic commerce.

OR

What do you understand by plagiarism? Why is it a punishable offence? Mention any two ways to avoid plagiarism.

Ans. Ans. Plagiarism is the act of using or stealing someone else’s intellectual work, ideas etc. and passing it as your own work. In other words, plagiarism is a failure in giving credit to its source. Plagiarism is a fraud and violation of Intellectual Property Rights. Since IPR holds a legal entity status, violating its owners right is a legally punishable offence.

Any two ways to avoid plagiarism:

· Be original

· Cite/acknowledge the source

30. Based on table STUDENT given here, write suitable SQL queries for the following:

i. Display gender wise highest marks.

Ans. select max(marks) from student group by gender;

ii. Display city wise lowest marks.

Ans. select min(marks) from student group by city;

iii. Display total number of male and female students.

Ans. select gender, count(gender) from student group by gender;

OR

Discuss the significance of Group by clause in detail with the help of suitable example.

Ans. GROUP BY clause is used in a SELECT statement in combination with aggregate functions to group the result based on distinct values in a column.

For example:

To display total number of male and female students from the table STUDENT, we need to first group records based on the gender then we should count records with the help of count() function.

Considering the following table STUDENT:

SQL query for the above-mentioned task is as follows:

select gender, count(gender) from student group by gender;

SECTION D

31. Write suitable SQL query for the following:

i. Display 7 characters extracted from 7 th left character onwards from the string ‘INDIA SHINING’.

Ans. select mid(‘INDIA SHINING’,7,7);

ii. Display the position of occurrence of string ‘COME’ in the string ‘WELCOME WORLD’.

Ans. select INSTR(‘WELCOME WORLD’,’COME’);

iii. Round off the value 23.78 to one decimal place.

Ans. select round(23.78,1);

iv. Display the remainder of 100 divided by 9.

Ans. select mod(100,9);

v. Remove all the expected leading and trailing spaces from a column userid of the table ‘USERS’.

Ans. select trim(userid) from users;

OR

Explain the following SQL functions using suitable examples.

i. UCASE()

Ans. It converts the string into upper case.

 Example: SELECT UCASE(‘welcome world’);

Output:

WELCOME WORLD

ii. TRIM()

Ans. It removes the leading and trailing spaces from the given string.

Example: SELECT TRIM(‘        Welcome world         ‘ );

Output:

Welcome world

iii. MID()

Ans.  It extracts the specified number of characters from given string.

Example: SELECT MID(‘ Welcome world,4,,4);

Output:

Come

iv. DAYNAME()

Ans.  It returns the weekday name for a given date

Example: SELECT DAYNAME(‘2022-07-22’);

Output:

Friday

v. POWER()

Ans. It returns the value of a number raised to the power of another number.

Example: SELECT POW(6,2);

Output:

36

32. Prime Computer services Ltd. is an international educational organization. It is planning to set up its India campus at Mumbai with its head office in Delhi. The Mumbai office campus has four main buildings-ADMIN, ACCOUNTS, EXAMINATION and RESULT.

You as a network expert have to suggest the best network related solutions for their problems raised in (i) to (v), keeping in mind the distances between the buildings and other given parameters.

(i) Suggest the most appropriate location of the server inside the MUMBAI campus (out of the four buildings) to get the best connectivity for maximum number of computers. Justify your answer.

Ans. Server should be installed in Admin department as it has maximum number of computers.

(ii) Suggest and draw cable layout to efficiently connect various buildings within the MUMBAI campus for a wired connectivity.

Ans.

(iii) Which networking device will you suggest to be procured by the company to interconnect all the computers of various buildings of MUMBAI campus?

Ans. Hub/Switch

(iv) Company is planning to get its website designed which will allow students to see their results after registering themselves on its server. Out of the static or dynamic, which type of website will you suggest?

Ans. Dynamic

(v) Which of the following will you suggest to establish the online face to face communication between the people in the ADMIN office of Mumbai campus and Delhi head office?

Ans. Video conferencing

a) Cable TV

b) Email

c) Video conferencing

d) Text chat

33. Write Python code to plot a bar chart for India’s medal tally as shown below:

Also give suitable python statement to save this chart.

Ans. import matplotlib.pyplot as plt

Category=[‘Gold’,’Silver’,’Bronze’]

Medal=[20,15,18]

plt.bar(Category,Medal)

plt.ylabel(‘Medal’)

plt.xlabel(‘Medal Type’)

plt.title(‘Indian Medal tally in Olympics’)

plt.show()

Python statement to save the chart:

plt.savefig(“aa.jpg”)

OR

Write a python program to plot a line chart based on the given data to depict the changing weekly average temperature in Delhi for four weeks.

Week=[1,2,3,4] Avg_week_temp=[40,42,38,44]

Ans. import matplotlib.pyplot as plt

Week=[1,2,3,4]

Avg_week_temp=[40,42,38,44]

plt.plot(Week,Avg_week_temp)

plt.show()

SECTION E

34. Shreya, a database administrator has designed a database for a clothing shop. Help her by writing answers of the following questions based on the given table:

TABLE: CLOTH

i. Write a query to display cloth names in lower case.

Ans. SELECT LOWER(CNAME) FROM CLOTH;

ii. Write a query to display the lowest price of the cloths.

Ans. SELECT MIN(PRICE) FROM CLOTH;

iii. Write a query to count total number of cloths purchased of medium size.

Ans. SELECT COUNT(*) FROM CLOTH GROUP BY SIZE HAVING SIZE=’M’;

OR (Option for part iii only)

Write a query to count year wise total number of cloths purchased.

Ans. SELECT YEAR(DOP),COUNT(*) FROM CLOTH GROUP BY YEAR(DOP);

35. Mr. Som, a data analyst has designed the DataFrame df that contains data about Computer Olympiad with ‘CO1’, ‘CO2’, ‘CO3’, ‘CO4’, ‘CO5’ as indexes shown below. Answer the following questions:

A. Predict the output of the following python statement:

i. df.shape

Ans. (5,4)

ii. df[2:4]

Ans.

B. Write Python statement to display the data of Topper column of indexes CO2 to CO4.

Ans. print(df.loc[‘CO2’: ‘CO4’, ‘Topper’])

OR (Option for part iii only)

Write Python statement to compute and display the difference of data of Tot_students column and First_Runnerup column of the above given DataFrame.

Ans. print(df.Tot_students-df.First_Runnerup)