Question 1

Question 9Find the output of the following:for i in range(20, 30, 2):
    print (i)1.21  
22  
23  
24  
25
2.21  
23  
25  
27  
29
3. SyntaxError4.20  
22  
24  
26  
28

Accepted Answer

20
22
24
26
28
Reason — The code uses a for loop with range(20, 30, 2), generating numbers from 20 to 28 with a step of 2. It iterates through these values, printing each number (20, 22, 24, 26, 28) on a new line.

Question 2

Question 11Observe the given code and select the appropriate output.Tuple given: tup1 = (10, 20, 30, 40, 50, 60, 70, 80, 90)What will be the output of: print(tup1[3:7:2])(40, 50, 60, 70, 80)(40, 50, 60, 70)(40, 60)Error

Accepted Answer

(40, 60)Reason — The slice tup1[3:7:2] extracts elements starting from index 3 up to index 6, with a step of 2. This means it selects elements at indices 3, 5, resulting in the tuple (40, 60). The print statement outputs these selected elements.

Question 3

Question 12Select the correct output of the following string operators.str1='One'
print(str1[:3] + 'Two' + str1[-3:])OneOneTwoTwoOneOneOneTwoOneError

Accepted Answer

OneTwoOneReason — The code uses str1[:3] to extract the first three characters of str1, which are 'One', and str1[-3:] to extract the last three characters, which are also 'One'. It then concatenates these with 'Two', resulting in 'OneTwoOne', which is printed.

Question 4

Question 13When a list is contained in another list as a member-element, it is called ............... .Nested tupleNested listArrayList

Accepted Answer

Nested listReason — When a list is contained within another list as an element, it is called a nested list.

Source: This question is from Practice Paper, Computer Science &mdash; Class 11, CBSE Board.
Key Concepts CoveredThis question tests your understanding of the following concepts from the chapter Practice Paper: Question, Contained, Another, Member, Element, Nested. These are fundamental topics in Computer Science that students are expected to master as part of the CBSE Class 11 curriculum.A thorough understanding of these concepts will help you answer similar questions confidently in your CBSE examinations. These topics are frequently tested in both objective and subjective sections of Computer Science papers. We recommend revising the relevant section of your textbook alongside practising these solved examples to build a strong foundation.
How to Approach This QuestionRead the question carefully and identify what is being asked. Break down complex questions into smaller parts. Use the terminology and concepts discussed in this chapter. Structure your answer logically — begin with a definition or key statement, then provide supporting details. Review your answer to ensure it addresses all parts of the question completely.
Key Points to RememberWrite programs with proper indentation and comments.
Trace through your code with sample inputs to verify correctness.
Explain the logic behind each step of your solution.
Familiarise yourself with common library functions and methods.
Related Questions from Practice PaperQ1: Question 33(a) Draw the structure of the components of a computer and briefly explain the...
Q10: Question 25(b) Differentiate between copyright and plagiarism.
Q11: Question 11 Observe the given code and select the appropriate output. Tuple given: tup1 = (10, 20,...
Q12: Question 12 Select the correct output of the following string operators. str1 = &#x27;One&#x27; print ( str1...
Q14: Question 14 The ............... method removes the last entered element from the dictionary. pop()...
Practice more questions from Practice Paper &mdash; Computer Science, Class 11 CBSE

Question 5

Question 14The ............... method removes the last entered element from the dictionary.pop()remove()popitem()del

Accepted Answer

popitem()Reason — The popitem() method removes and returns the last entered key-value pair from the dictionary.

Source: This question is from Practice Paper, Computer Science &mdash; Class 11, CBSE Board.
Key Concepts CoveredThis question tests your understanding of the following concepts from the chapter Practice Paper: Question, Method, Removes, Last, Entered, Element. These are fundamental topics in Computer Science that students are expected to master as part of the CBSE Class 11 curriculum.A thorough understanding of these concepts will help you answer similar questions confidently in your CBSE examinations. These topics are frequently tested in both objective and subjective sections of Computer Science papers. We recommend revising the relevant section of your textbook alongside practising these solved examples to build a strong foundation.
How to Approach This QuestionRead the question carefully and identify what is being asked. Break down complex questions into smaller parts. Use the terminology and concepts discussed in this chapter. Structure your answer logically — begin with a definition or key statement, then provide supporting details. Review your answer to ensure it addresses all parts of the question completely.
Key Points to RememberWrite programs with proper indentation and comments.
Trace through your code with sample inputs to verify correctness.
Explain the logic behind each step of your solution.
Familiarise yourself with common library functions and methods.
Related Questions from Practice PaperQ1: Question 33(a) Draw the structure of the components of a computer and briefly explain the...
Q10: Question 25(b) Differentiate between copyright and plagiarism.
Q11: Question 11 Observe the given code and select the appropriate output. Tuple given: tup1 = (10, 20,...
Q12: Question 12 Select the correct output of the following string operators. str1 = &#x27;One&#x27; print ( str1...
Q15: Question 15 Srishti is down with fever, so she decides not to go to school. The next day, she calls...
Practice more questions from Practice Paper &mdash; Computer Science, Class 11 CBSE

Question 6

Question 15Srishti is down with fever, so she decides not to go to school. The next day, she calls up her classmate Shaurya and enquires about the computer class. She also requests him to explain the concept taught in the class. Shaurya quickly downloads a 2-minute video clip from the internet explaining the concept of Tuples in Python. Using video editor, he adds this text in the downloaded video clip: "Prepared by Shaurya". Then, he emails the modified video clip to Srishti. This act of Shaurya is an example of:Fair useHackingCopyright infringementCyber crime

Accepted Answer

Copyright infringementReason — Shaurya downloading, modifying, and emailing a video clip without proper authorization from the original content creator constitutes copyright infringement.

Question 7

Question 16............... are the records and traces individuals leave behind as they use the internet.Digital footprintsCookiesWebsiteURL

Accepted Answer

Digital footprintsReason — Digital footprints are the records and traces individuals leave behind as they use the internet.

Source: This question is from Practice Paper, Computer Science &mdash; Class 11, CBSE Board.
Key Concepts CoveredThis question tests your understanding of the following concepts from the chapter Practice Paper: Question, Records, Traces, Individuals, Leave, Behind. These are fundamental topics in Computer Science that students are expected to master as part of the CBSE Class 11 curriculum.A thorough understanding of these concepts will help you answer similar questions confidently in your CBSE examinations. These topics are frequently tested in both objective and subjective sections of Computer Science papers. We recommend revising the relevant section of your textbook alongside practising these solved examples to build a strong foundation.
How to Approach This QuestionRead the question carefully and identify what is being asked. Break down complex questions into smaller parts. Use the terminology and concepts discussed in this chapter. Structure your answer logically — begin with a definition or key statement, then provide supporting details. Review your answer to ensure it addresses all parts of the question completely.
Key Points to RememberWrite programs with proper indentation and comments.
Trace through your code with sample inputs to verify correctness.
Explain the logic behind each step of your solution.
Familiarise yourself with common library functions and methods.
Related Questions from Practice PaperQ1: Question 33(a) Draw the structure of the components of a computer and briefly explain the...
Q10: Question 25(b) Differentiate between copyright and plagiarism.
Q11: Question 11 Observe the given code and select the appropriate output. Tuple given: tup1 = (10, 20,...
Q12: Question 12 Select the correct output of the following string operators. str1 = &#x27;One&#x27; print ( str1...
Q14: Question 14 The ............... method removes the last entered element from the dictionary. pop()...
Practice more questions from Practice Paper &mdash; Computer Science, Class 11 CBSE

Question 8

Question 17Assertion (A): In Python, a variable can hold values of different types at different times.Reason (R): Once assigned, a variable's data type remains fixed throughout the program.Both A and R are true and R is the correct explanation of A.Both A and R are true but R is not the correct explanation of A.A is true but R is false.A is false but R is true.

Accepted Answer

A is true but R is false.ExplanationIn Python, variables are dynamically typed, so they can hold values of different types at different times. This means that a variable's data type is not fixed once assigned, and Python allows changing the type of a variable during the program's execution.

Question 9

Question 18Assertion (A): Python lists allow modifying their elements by indexes easily.Reason (R): Python lists are mutable.Both A and R are true and R is the correct explanation of A.Both A and R are true but R is not the correct explanation of A.A is true but R is false.A is false but R is true.

Accepted Answer

Both A and R are true and R is the correct explanation of A.ExplanationPython lists allow modifying their elements using indexes. This is possible because Python lists are mutable, meaning their contents can be changed after creation.

Question 10

Question 24(b)What are the ways by which websites track us?

Accepted Answer

The ways by which websites track us online are as follows:IP Address — From our IP address, a website can determine our rough geographical location.Cookies and Tracking Scripts — They can identify and track our browsing activity across a website.HTTP Referrer — When a link to an outside website on a webpage is clicked, then the linked website will get opened and internally our information will be provided to the linked website.Super Cookies — Super Cookies are persistent cookies that come back even after we delete them.User Agent — It tells websites our browser and operating system, providing another piece of data that can be stored and used to target ads.

Question 11

Question 25(b)Differentiate between copyright and plagiarism.

Accepted Answer

CopyrightPlagiarismCopyright is a legal protection for creators of original works like books, music, software, etc. It gives them exclusive rights to use, distribute, and profit from their work.Plagiarism is copying someone else's work and then passing it off as one's own.Copyright infringement occurs when someone uses a copyrighted work without permission, potentially facing legal consequences.Plagiarism can be accidental/unintentional or deliberate/intentional. For work that is in the public domain or not protected by copyright, it can still be plagiarized if proper credit is not given.

Question 12

Question 27(b)Explain the given built-in string functions and provide the syntax and example of each.(a) replace()(b) title()(c) partition()

Accepted Answer

(a) replace() — This function replaces all the occurrences of the old string with the new string. The syntax is str.replace(old, new).For example,str1 = "This is a string example"
print(str1.replace("is", "was"))OutputThwas was a string example
(b) title() — This function returns the string with first letter of every word in the string in uppercase and rest in lowercase. The syntax is str.title().For example,str1 = "hello ITS all about STRINGS!!"
print(str1.title())OutputHello Its All About Strings!!
(c) partition() — The partition() function is used to split the given string using the specified separator and returns a tuple with three parts: substring before the separator, separator itself, a substring after the separator. The syntax is str.partition(separator), where separator argument is required to separate a string. If the separator is not found, it returns the string itself followed by two empty strings within parenthesis as tuple.For example,str3 = "xyz@gmail.com"
result = str3.partition("@")
print(result)Output('xyz', '@', 'gmail.com')

Question 13

Question 29What are the characteristics of Dictionary?

Accepted Answer

The characteristics of dictionary are as follows:Each key maps to a value — The association of a key and a value is called a key-value pair. However, there is no order defined for the pairs, thus, dictionaries are unordered.Each key is separated from its value by a colon (:). The items are separated by commas, and the entire dictionary is enclosed in curly braces {}.Keys are unique and immutable — Keys are unique within a dictionary while values are mutable and can be changed.Indexed by Keys — The elements in a dictionary are indexed by keys and not by their relative positions or indices.The value of a dictionary can be of any type, but the keys must be of an immutable data type such as strings, numbers or tuples.Dictionary is mutable — We can add new items, delete or change the value of existing items.

Question 14

Question 30What are the issues associated with disability while teaching and using computers?

Accepted Answer

Cognitive disabilities include conditions like autism and Down's syndrome. Some less severe conditions are called learning disabilities, such as dyslexia (difficulty with reading) and dyscalculia (difficulty with math). The functional disability perspective looks at what a person can and cannot do instead of focusing on the medical reasons behind their cognitive disabilities.The functional cognitive disabilities may involve difficulties or deficits involving:Problem-solvingMemoryVisual comprehensionLinguistic (speech)AttentionMath comprehensionReadingVerbal comprehension

Question 15

Question 33(a)Draw the structure of the components of a computer and briefly explain the following.(a) Input Unit(b) Output Unit(c) Central Processing Unit(d) Primary Memory(e) Secondary Memory

Accepted Answer

Input Unit — An input unit takes/accepts input and converts it into binary form so that it can be understood by the computer. The computer input constitutes data and instructions.Examples: Keyboard, mouse, scanner, and microphone.Output Unit — Output unit is formed by the output devices attached to the computer. Output devices produce the output generated by the CPU in human readable form.Examples: Monitor, printer, and speakers.Central Processing Unit — CPU is the control centre or brain of a computer. It guides, directs, controls and governs all the processing that takes place inside the computer. The CPU consists of three components — ALU, CU and Registers.Primary Memory — The primary memory, also termed as main memory, is directly accessible to the CPU since all the work is done in the RAM and later on gets stored on the secondary storage. It is volatile, meaning it loses its data when the power is turned off. The types of primary memory are RAM and ROM.Secondary Memory — The secondary memory, also known as auxiliary memory, can be accessed by the CPU through input-output controllers or units. It is used to store a large amount of data permanently. It is non-volatile, meaning it retains data even when the computer is turned off.

Question 16

Question 33(b)Write a menu-driven program to implement a simple calculator for two numbers given by the user.Solutionwhile True:
    print("Simple Calculator")
    print("1. Add")
    print("2. Subtract")
    print("3. Multiply")
    print("4. Divide")
    print("5. Exit")
    choice = input("Enter choice (1/2/3/4/5): ")

if choice in ['1', '2', '3', '4', '5']:
        if choice == '5':
            print("Exiting the calculator.")
            break

num1 = float(input("Enter first number: "))
        num2 = float(input("Enter second number: "))

if choice == '1':
            result = num1 + num2
            print(num1, "+", num2, "=", result)
        elif choice == '2':
            result = num1 - num2
            print(num1, "-", num2, "=", result)
        elif choice == '3':
            result = num1 * num2
            print(num1, "*", num2, "=", result)
        elif choice == '4':
            if num2 != 0:
                result = num1 / num2
                print(num1, "/", num2, "=", result)
            else:
                print("Error! Division by zero.")
    else:
        print("Invalid choice! Please select a valid option.")OutputSimple Calculator
1. Add
2. Subtract
3. Multiply
4. Divide
5. Exit
Enter choice (1/2/3/4/5): 1
Enter first number: 234
Enter second number: 33
234.0 + 33.0 = 267.0
Simple Calculator
1. Add
2. Subtract
3. Multiply
4. Divide
5. Exit
Enter choice (1/2/3/4/5): 2
Enter first number: 34
Enter second number: 9
34.0 - 9.0 = 25.0
Simple Calculator
1. Add
2. Subtract
3. Multiply
4. Divide
5. Exit
Enter choice (1/2/3/4/5): 3
Enter first number: 2
Enter second number: 45
2.0 * 45.0 = 90.0
Simple Calculator
1. Add
2. Subtract
3. Multiply
4. Divide
5. Exit
Enter choice (1/2/3/4/5): 4
Enter first number: 452
Enter second number: 4
452.0 / 4.0 = 113.0
Simple Calculator
1. Add
2. Subtract
3. Multiply
4. Divide
5. Exit
Enter choice (1/2/3/4/5): 5
Exiting the calculator.

Accepted Answer

whileTrue:print("Simple Calculator")print("1. Add")print("2. Subtract")print("3. Multiply")print("4. Divide")print("5. Exit")choice=input("Enter choice (1/2/3/4/5): ")ifchoicein['1','2','3','4','5']:ifchoice=='5':print("Exiting the calculator.")breaknum1=float(input("Enter first number: "))num2=float(input("Enter second number: "))ifchoice=='1':result=num1+num2print(num1,"+",num2,"=",result)elifchoice=='2':result=num1-num2print(num1,"-",num2,"=",result)elifchoice=='3':result=num1*num2print(num1,"*",num2,"=",result)elifchoice=='4':ifnum2!=0:result=num1/num2print(num1,"/",num2,"=",result)else:print("Error! Division by zero.")else:print("Invalid choice! Please select a valid option.")OutputSimple Calculator1. Add2. Subtract3. Multiply4. Divide5. ExitEnter choice (1/2/3/4/5): 1Enter first number: 234Enter second number: 33234.0 + 33.0 = 267.0Simple Calculator1. Add2. Subtract3. Multiply4. Divide5. ExitEnter choice (1/2/3/4/5): 2Enter first number: 34Enter second number: 934.0 - 9.0 = 25.0Simple Calculator1. Add2. Subtract3. Multiply4. Divide5. ExitEnter choice (1/2/3/4/5): 3Enter first number: 2Enter second number: 452.0 * 45.0 = 90.0Simple Calculator1. Add2. Subtract3. Multiply4. Divide5. ExitEnter choice (1/2/3/4/5): 4Enter first number: 452Enter second number: 4452.0 / 4.0 = 113.0Simple Calculator1. Add2. Subtract3. Multiply4. Divide5. ExitEnter choice (1/2/3/4/5): 5Exiting the calculator.

Question 17

Question 34(b)Write a program to create a dictionary with the roll number, name and marks of n students in a class, and display the names of students who have secured marks above 75.Solutionn = int(input("Enter the number of students: "))
student_data = {}

for i in range(n):
    roll_number = int(input("Enter roll number for student: "))
    name = input("Enter name for student: ")
    marks = int(input("Enter marks for student: "))
    student_data[roll_number] = {'name': name, 'marks': marks}
print(student_data)

print("Students who have secured marks above 75:")
for roll_number, details in student_data.items():
    if details['marks'] > 75:
        print(details['name'])OutputEnter the number of students: 4
Enter roll number for student: 5
Enter name for student: Ashish Kumar
Enter marks for student: 67
Enter roll number for student: 4
Enter name for student: Samay
Enter marks for student: 79
Enter roll number for student: 5
Enter name for student: Rohini 
Enter marks for student: 89
Enter roll number for student: 6
Enter name for student: Anusha
Enter marks for student: 73
{5: {'name': 'Rohini', 'marks': 89}, 4: {'name': 'Samay', 'marks': 79}, 6: {'name': 'Anusha', 'marks': 73}}
Students who have secured marks above 75:
Rohini
Samay

Accepted Answer

n=int(input("Enter the number of students: "))student_data={}foriinrange(n):roll_number=int(input("Enter roll number for student: "))name=input("Enter name for student: ")marks=int(input("Enter marks for student: "))student_data[roll_number]={'name':name,'marks':marks}print(student_data)print("Students who have secured marks above 75:")forroll_number,detailsinstudent_data.items():ifdetails['marks']>75:print(details['name'])OutputEnter the number of students: 4Enter roll number for student: 5Enter name for student: Ashish KumarEnter marks for student: 67Enter roll number for student: 4Enter name for student: SamayEnter marks for student: 79Enter roll number for student: 5Enter name for student: Rohini Enter marks for student: 89Enter roll number for student: 6Enter name for student: AnushaEnter marks for student: 73{5: {'name': 'Rohini', 'marks': 89}, 4: {'name': 'Samay', 'marks': 79}, 6: {'name': 'Anusha', 'marks': 73}}Students who have secured marks above 75:RohiniSamay

Question 18

Question 35Explain any five social media etiquettes.

Accepted Answer

The social media etiquettes are as follows:Choose password wisely — News of breach or leakage of user data from social network often attracts headlines. Users should be wary of such possibilities and must know how to safeguard themselves and their accounts. The minimum one can do is to have a strong password and change it frequently, and never share personal credentials like username and password with others.Know who you befriend — Social networking sites usually encourage connecting with users (making friends), sometime even those we don't know or have never met. However, we need to be careful while befriending unknown people as their intentions could possibly be malicious.Beware of fake information — Fake news, messages and posts are common in social networks. As a user, we should be aware of them and be able to figure out whether a news, message or post is genuine or fake. Thus, we should not blindly believe in everything that we come across on such platforms. We should apply our knowledge and experience to validate such news, message or post.Think before uploading — We can upload almost anything on social network. However, remember that once uploaded, it is always there in the remote server even if we delete the files. Hence, we need to be cautious while uploading or sending sensitive or confidential files which have a bearing on our privacy.Privacy matters — Regularly check our privacy settings on social media and always think before posting because it spreads all over the internet.

Practice Paper

Section A 1 Mark Each

Section B 2 Marks Each

Section C 3 Marks Each

Section E 5 Marks Each