Solved 2025 Sample Question Paper CBSE Class 12 Informatics Practices (065)

State whether the following statement is True or False:

Slicing can be used to extract a specific portion from a Pandas Series.

The purpose of WHERE clause in a SQL statement is to:

1. Create a table
2. Filter rows based on a specific condition
3. Specify the columns to be displayed
4. Sort the result based on a column

Identify the networking device responsible for routing data packets based on their destination addresses.

1. Modem
2. Hub
3. Repeater
4. Router

Identify the SQL command used to delete a relation (table) from a relational database.

1. DROP TABLE
2. REMOVE TABLE
3. DELETE TABLE
4. ERASE TABLE

e-waste refers to:

1. Software that has become obsolete
2. Data that has been deleted from a storage device
3. Viruses that infect computers
4. Electronic devices that are no longer in use

Which of the following Python statements can be used to select a column column_name from a DataFrame df ?

1. df.getcolumn('column_name')
2. df['column_name']
3. df.select('column_name')
4. df(column_name)

By default, the plot() function of Matplotlib draws a ............... plot.

1. histogram
2. column
3. bar
4. line

State whether the following statement is True or False:

In SQL, the HAVING clause is used to apply filter on groups formed by the GROUP BY clause.

Which of the following Python statements is used to import data from a CSV file into a Pandas DataFrame (Note: pd is an alias for pandas)?

1. pd.open_csv('filename.csv')
2. pd.read_csv('filename.csv')
3. pd.load_csv('filename.csv')
4. pd.import_csv('filename.csv')

What is plagiarism ?

1. Using copyrighted material without giving proper acknowledgement to the source
2. Downloading illegal software.
3. Spreading misinformation online.
4. Hacking into computer systems.

Fill in the Blank

The COUNT(*) function provides the total number of ............... within a relation (table) in a relational database.

1. Columns
2. Unique values
3. Not-null values
4. Rows

In which of the network topologies do all devices connect to a central point, such as a switch or hub?

1. Star
2. Bus
3. Tree
4. Mesh

In a Pandas DataFrame, if the tail() function is used without specifying the optional argument indicating the number of rows to display, what is the default number of rows displayed, considering the DataFrame has 10 entries ?

1. 0
2. 1
3. 4
4. 5

Identify the type of cybercrime that involves sending fraudulent emails to deceive individuals into revealing sensitive information.

1. Hacking
2. Phishing
3. Cyberbullying
4. Cyberstalking

While creating a Series using a dictionary, the keys of the dictionary become:

1. Values of the Series
2. Indices of the Series
3. Data type of the Series
4. Name of the Series

Match the following SQL functions/clauses with their descriptions:

1. P-2, Q-4, R-3, S-1
2. P-2, Q-4, R-1, S-3
3. P-4, Q-3, R-2, S-1
4. P-4, Q-2, R-1, S-3

Fill in the Blank

Boolean indexing in Pandas DataFrame can be used for ...............

1. Creating a new DataFrame
2. Sorting data based on index labels
3. Joining data using labels
4. Filtering data based on condition

Which Matplotlib plot is best suited to represent changes in data over time?

1. Bar plot
2. Histogram
3. Line plot
4. Histogram & Bar plot

Which type of network covers a small geographical area like a single office, building, or school campus?

1. PAN
2. MAN
3. LAN
4. WAN

Assertion (A): We can add a new column in an existing DataFrame.

Reason (R): DataFrames are size mutable.

1. Both A and R are true, and R is the correct explanation of A.
2. Both A and R are true, and R is not the correct explanation of A.
3. A is true but R is false.
4. A is false but R is true.

Assertion (A): In SQL, INSERT INTO is a Data Definition Language (DDL) Command.

Reason (R): DDL commands are used to create, modify, or remove database structures, such as tables.

1. Both A and R are true, and R is the correct explanation of A.
2. Both A and R are true, and R is not the correct explanation of A.
3. A is true but R is false.
4. A is false but R is true.

What is a Series in Python Pandas? Also, give a suitable example to support your answer.

What does the term 'library' signify in Python? Mention one use for each of the following libraries:

• Pandas
• Matplotlib

What are intellectual property rights (IPR), and why are they important in the digital world?

Consider the string: "Database Management System". Write suitable SQL queries for the following:

I. To extract and display "Manage" from the string.

II. Display the position of the first occurrence of "base" in the given string.

What is Internet and how does it differ from World Wide Web (WWW)?

Explain the concept of browser cookies and mention one advantage of using them.

Define the term Primary Key in a database. Explain how it is different from a Candidate Key.

Mention two health concerns associated with excessive use of Digital Devices.

Sneha is writing a Python program to create a DataFrame using a list of dictionaries. However, her code contains some mistakes. Identify the errors, rewrite the correct code, and underline the corrections made.

import Pandas as pd 
D1 = {'Name': 'Rakshit', 'Age': 25} 
D2 = {'Name': 'Paul', 'Age': 30} 
D3 = {'Name': 'Ayesha", 'Age': 28} 
data = [D1, D2, D3) 
df = pd.Dataframe(data) 
print(df)

Complete the given Python code to get the required output (ignore the dtype attribute) as

Output:

Tamil Nadu       Chennai   
Uttar Pradesh    Lucknow   
Manipur           Imphal   

Code:

import _______ as pd 
data = ['Chennai','_______','Imphal'] 
indx = ['Tamil Nadu','Uttar Pradesh','Manipur'] 
s = pd.Series(_______, indx) 
print(_______) 

Ayesha's family is replacing their old computer with a new one. They decide to throw the old computer in a nearby empty field/plot.

I. Explain any one potential environmental hazard associated with improper e-waste disposal.

II. Suggest one responsible way to Ayesha's family for proper disposal of their old computer.

III. Describe the importance of recycling in e-waste management.

Write a Python program to create the following DataFrame using a list of dictionaries.

import pandas as pd 
d1 = {'Product': 'Laptop', 'Price': 60000} 
d2 = {'Product': 'Desktop', 'Price': 45000} 
d3 = {'Product': 'Monitor', 'Price': 15000} 
d4 = {'Product': 'Tablet', 'Price': 30000} 
data = [d1, d2, d3, d4] 
df = pd.DataFrame(data) 
print(df)

   Product  Price
0   Laptop  60000
1  Desktop  45000
2  Monitor  15000
3   Tablet  30000

Write a Python Program to create a Pandas Series as shown below using a dictionary. Note that the left column indicates the indices and the right column displays the data.

import pandas as pd 
data = {'Russia':'Moscow','Hungary':'Budapest','Switzerland':'Bern'} 
s = pd.Series(data) 
print(s)

Russia           Moscow
Hungary        Budapest
Switzerland        Bern
dtype: object

I. Write an SQL statement to create a table named STUDENTS, with the following specifications:

II. Write SQL Query to insert the following data in the Students Table

1, Supriya, Singh, 2010-08-18, 75.5

Consider the following tables:

Table 1:

EMPLOYEE which stores Employee ID (EMP_ID), Employee Name (EMP_NAME), Employee City (EMP_CITY)

Table 2:

PAYROLL which stores Employee ID (EMP_ID), Department (DEPARTMENT), Designation (DESIGNATION), and Salary (SALARY) for various employees.

Note: Attribute names are written within brackets.

Table: EMPLOYEE

Table: PAYROLL

Write appropriate SQL queries for the following:

I. Display department-wise average Salary.

II. List all designations in the decreasing order of Salary.

III. Display employee name along with their corresponding departments.

Consider the following tables:

Table 1:

ATHLETE, which stores AthleteID, Name, Country. The table displays basic information of the athletes.

Table 2:

MEDALS, which stores AthleteID, Sport, and Medals. The table displays the number of medals won by each athlete in their respective sports.

Table: ATHLETE

Table: MEDALS

Write appropriate SQL queries for the following:

I. Display the sports-wise total number of medals won.

II. Display the names of all the Indian athletes in uppercase.

III. Display the athlete name along with their corresponding sports

During a practical exam, a student Ankita has to fill in the blanks in a Python program that generates a bar chart. This bar chart represents the number of books read by four students in one month.

Help Ankita to complete the code.

import _____ as plt #Statement-1 
students = ['Karan', 'Lina', 'Raj', 'Simran'] 
books_read = [12, 9, 5, 3] 
plt.bar( students, _____, label='Books Read') #Statement-2 
plt.xlabel('Student Name') 
plt._____('Books Read') #Statement-3 
plt.legend() 
plt.title('_____') #Statement-4 
plt.show()

I. Write the suitable code for the import statement in the blank space in the line marked as Statement-1.

II. Refer to the graph shown above and fill in the blank in Statement-2 with suitable Python code.

III. Fill in the blank in Statement-3 with the name of the function to set the label on the y-axis.

IV. Refer the graph shown above and fill the blank in Statement-4 with suitable Chart Title.

Rahul, who works as a database designer, has developed a database for a bookshop. This database includes a table BOOK whose column (attribute) names are mentioned below:

BCODE: Shows the unique code for each book.

TITLE: Indicates the book’s title.

AUTHOR: Specifies the author’s name.

PRICE: Lists the cost of the book.

Table: BOOK

I. Write SQL query to display book titles in lowercase.

II. Write SQL query to display the highest price among the books.

III. Write SQL query to display the number of characters in each book title.

IV. Write SQL query to display the Book Code and Price sorted by Price in descending order.

Dr. Kavita has created a database for a hospital's pharmacy. The database includes a table named MEDICINE whose column (attribute) names are mentioned below:

MID: Shows the unique code for each medicine.

MED_NAME: Specifies the medicine name.

SUPP_CITY: Specifies the city where the supplier is located.

STOCK: Indicates the quantity of medicine available.

DEL_DATE: Specifies the date when the medicine was delivered.

Table: MEDICINE

Write the output of the following SQL Queries.

I. Select LENGTH(MED_NAME) from MEDICINE where STOCK > 100;

II. Select MED_NAME from MEDICINE where month(DEL_DATE) = 4;

III. Select MED_NAME from MEDICINE where STOCK between 120 and 200;

IV. Select max(DEL_DATE) from MEDICINE;

ABC Pvt. Ltd., a multinational technology company, is looking to establish its Indian Head Office in Bengaluru, and a regional office branch in Lucknow. The Bengaluru head office will be organized into four departments: HR, FINANCE, TECHNICAL, AND SUPPORT. As a network engineer, you have to propose solutions for various queries listed from I to V.

The shortest distances between the departments/offices are as follows:

The number of computers in each department/office is as follows:

I. Suggest the most suitable department in the Bengaluru Office Setup, to install the server. Also, give a reason to justify your suggested location.

II. Draw a suitable cable layout of wired network connectivity between the departments in the Bengaluru Office.

III. Which networking device would you suggest the company to purchase to interconnect all the computers within a department in Bengaluru Office?

IV. The company is considering establishing a network connection between its Bengaluru Head Office and Lucknow regional office. Which type of network—LAN, MAN, or WAN—will be created? Justify your answer.

V. The company plans to develop an interactive website that will enable its employees to monitor their performance after login. Would you recommend a static or dynamic website, and why?

Consider the DataFrame df shown below.

Write Python statements for the DataFrame df to:

I. Print the first two rows of the DataFrame df.

II. Display titles of all the movies.

III. Remove the column rating.

IV. Display the data of the 'Title' column from indexes 2 to 4 (both included)

V. Rename the column name 'Title' to 'Name'.

Write suitable SQL query for the following:

I. To display the average score from the test_results column (attribute) in the Exams table.

II. To display the last three characters of the registration_number column (attribute) in the Vehicles table. (Note: The registration numbers are stored in the format DL-01-AV-1234)

III. To display the data from the column (attribute) username in the Users table, after eliminating any leading and trailing spaces.

IV. To display the maximum value in the salary column (attribute) of the Employees table.

V. To determine the count of rows in the Suppliers table.

Write suitable SQL query for the following:

I. Round the value of pi (3.14159) to two decimal places.

II. Calculate the remainder when 125 is divided by 8.

III. Display the number of characters in the word 'NewDelhi'.

IV. Display the first 5 characters from the word 'Informatics Practices'.

V. Display details from 'email' column (attribute), in the 'Students' table, after removing any leading and trailing spaces.