Question 1

Question 19Which of the following can add only one value to a list?add( )append( )extend( )none of these

Accepted Answer

Answer: append( )

Source: This question is from List Manipulation, Computer Science &mdash; Class 11, CBSE Board.
Key Concepts CoveredThis question tests your understanding of the following concepts from the chapter List Manipulation: Question, Add, Value, Append, Extend, None. 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 MCQsMultiple choice questions test your ability to quickly recall facts and apply concepts. Read all options carefully before selecting your answer. Use the process of elimination to rule out clearly incorrect options first. If two options seem similar, look for the subtle difference that makes one more accurate. For numerical MCQs, verify your answer by substituting it back into the problem.
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 List ManipulationQ1: Question 1 Write a program to increment the elements of a list with a number. Solution lst = eval (...
Q10: Question 10 What are list slices? What for can you use them?
Q11: Question 11 Predict the output of following two parts. Are the outputs same? Are the outputs...
Q12: Question 10 Write a program that reads the n to display nth term of Fibonacci series. The Fibonacci...
Q13: Question 13 What do you understand by true copy of a list? How is it different from shallow copy?
Practice more questions from List Manipulation &mdash; Computer Science, Class 11 CBSE

Question 2

Question 23Which of the following can delete an element from a list, if its value is given?pop( )remove( )delall of these

Accepted Answer

Answer: remove( )

Source: This question is from List Manipulation, Computer Science &mdash; Class 11, CBSE Board.
Key Concepts CoveredThis question tests your understanding of the following concepts from the chapter List Manipulation: Question, Delete, Element, Value, Pop, Remove. 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 MCQsMultiple choice questions test your ability to quickly recall facts and apply concepts. Read all options carefully before selecting your answer. Use the process of elimination to rule out clearly incorrect options first. If two options seem similar, look for the subtle difference that makes one more accurate. For numerical MCQs, verify your answer by substituting it back into the problem.
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 List ManipulationQ1: Question 1 Write a program to increment the elements of a list with a number. Solution lst = eval (...
Q10: Question 10 What are list slices? What for can you use them?
Q11: Question 11 Predict the output of following two parts. Are the outputs same? Are the outputs...
Q12: Question 10 Write a program that reads the n to display nth term of Fibonacci series. The Fibonacci...
Q13: Question 13 What do you understand by true copy of a list? How is it different from shallow copy?
Practice more questions from List Manipulation &mdash; Computer Science, Class 11 CBSE

Question 3

Question 24Which of the following searches for an element in a list and returns its index?search( )find( )index( )lsearch( )

Accepted Answer

Answer: index( )

Source: This question is from List Manipulation, Computer Science &mdash; Class 11, CBSE Board.
Key Concepts CoveredThis question tests your understanding of the following concepts from the chapter List Manipulation: Question, Searches, Element, Returns, Index, Search. 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 MCQsMultiple choice questions test your ability to quickly recall facts and apply concepts. Read all options carefully before selecting your answer. Use the process of elimination to rule out clearly incorrect options first. If two options seem similar, look for the subtle difference that makes one more accurate. For numerical MCQs, verify your answer by substituting it back into the problem.
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 List ManipulationQ1: Question 1 Write a program to increment the elements of a list with a number. Solution lst = eval (...
Q10: Question 10 What are list slices? What for can you use them?
Q11: Question 11 Predict the output of following two parts. Are the outputs same? Are the outputs...
Q12: Question 10 Write a program that reads the n to display nth term of Fibonacci series. The Fibonacci...
Q13: Question 13 What do you understand by true copy of a list? How is it different from shallow copy?
Practice more questions from List Manipulation &mdash; Computer Science, Class 11 CBSE

Question 4

Question 25Which of the following can copy a list to another list?list( )new( )copy( )= operator

Accepted Answer

Answer: list( ), copy( )

Source: This question is from List Manipulation, Computer Science &mdash; Class 11, CBSE Board.
Key Concepts CoveredThis question tests your understanding of the following concepts from the chapter List Manipulation: Question, Copy, Another, New, Operator, List Manipulation. 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 MCQsMultiple choice questions test your ability to quickly recall facts and apply concepts. Read all options carefully before selecting your answer. Use the process of elimination to rule out clearly incorrect options first. If two options seem similar, look for the subtle difference that makes one more accurate. For numerical MCQs, verify your answer by substituting it back into the problem.
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 List ManipulationQ1: Question 1 Write a program to increment the elements of a list with a number. Solution lst = eval (...
Q10: Question 10 What are list slices? What for can you use them?
Q11: Question 11 Predict the output of following two parts. Are the outputs same? Are the outputs...
Q12: Question 10 Write a program that reads the n to display nth term of Fibonacci series. The Fibonacci...
Q13: Question 13 What do you understand by true copy of a list? How is it different from shallow copy?
Practice more questions from List Manipulation &mdash; Computer Science, Class 11 CBSE

Question 5

Question 2What do you understand by mutability? What does "in place" memory updation mean?

Accepted Answer

Mutability means that the value of an object can be updated by directly changing the contents of the memory location where the object is stored. There is no need to create another copy of the object in a new memory location with the updated values. This updation of the existing memory location of the object is called as in place memory updation.

Question 6

Question 4If a is [1, 2, 3]what is the difference (if any) between a * 3 and [a, a, a]?is a * 3 equivalent to a + a + a?what is the meaning of a[1:1] = 9?what's the difference between a[1:2] = 4 and a[1:1] = 4?

Accepted Answer

a * 3 ⇒ [1, 2, 3, 1, 2, 3, 1, 2, 3][a, a, a] ⇒ [[1, 2, 3], [1, 2, 3], [1, 2, 3]]So, a * 3 repeats the elements of the list whereas [a, a, a] creates nested list.Yes, both a * 3 and a + a + a will result in [1, 2, 3, 1, 2, 3, 1, 2, 3]a[1:1] = 9 will cause an error because when list is modified using slices, the value being assigned must be a sequence but 9 is an integer not a sequence.Both a[1:2] = 4 and a[1:1] = 4 will cause error because when list is modified using slices, the value being assigned must be a sequence but 4 is an integer not a sequence. Assuming the question was a[1:2] = [4] and a[1:1] = [4], a[1:2] = [4] will change element at index 1 to 4 as a[1:2] gives a slice with a[1] as its only element. Thus, a becomes [1, 4, 3]. Coming to a[1:1] = [4], a[1:1] returns an empty slice so 4 is inserted into the list at index 1. Thus, a becomes [1, 4, 2, 3].

Question 7

Question 8What's the purpose of the del operator and pop method? Try deleting a slice.

Accepted Answer

The del statement is used to remove an individual element or elements identified by a slice. It can also be used to delete all elements of the list along with the list object. For example,lst = [1, 2, 3, 4, 5, 6, 7, 8]
del lst[1]   # delete element at index 1
del lst[2:5] # delete elements from index 2 to 4
del lst # delete complete list pop() method is used to remove a single element from the given position in the list and return it. If no index is specified, pop() removes and returns the last element in the list. For example,lst = [1, 2, 3, 4, 5, 6, 7, 8]

# removes element at  
# index 1 i.e. 2 from 
# the list and stores 
# in variable a
a = pop(1)

# removes the last element 
# i.e. 8 from the list and
# stores in variable b
b = pop()

Question 8

Question 9What does each of the following expressions evaluate to? Suppose that L is the list["These", ["are", "a", "few", "words"], "that", "we", "will", "use"].L[1][0::2]"a" in L[1][0]L[:1] + L[1]L[2::2]L[2][2] in L[1]

Accepted Answer

['are', 'few']True['These', 'are', 'a', 'few', 'words']['that', 'will']TrueExplanationL[1] returns ["are", "a", "few", "words"]. L[1][0::2] returns a slice of ["are", "a", "few", "words"] starting at index 0 covering every alternate element till the end of the list. So, final output is ['are', 'few'].L[1][0] is "are". As "a" is present in "are" so output is True.L[:1] return L[0] i.e. ["These"]. L[1] returns ["are", "a", "few", "words"]. + operator adds the two in a single list to give the final output as ['These', 'are', 'a', 'few', 'words'].L[2::2] returns a slice of L starting at index 2 covering every alternate element till the end of the list. So, final output is ['that', 'will'].L[1] is ["are", "a", "few", "words"]. L[2][2] is "a". As "a" is present in L[1] so output is True.

Question 9

Question 10What are list slices? What for can you use them?

Accepted Answer

List slice is an extracted part of the list containing the requested elements. The list slice is a list in itself. All list operations can be performed on a list slice. List slices are used to copy the required elements to a new list and to modify the required parts of the list. For example,lst = [1, 2, 3, 4, 5]
lst2 = lst[1:4] #lst2 is [2, 3, 4]

#Using Slices for list modification
lst[0:2] = [10, 20] #lst becomes [10, 20, 3, 4, 5]

Question 10

Question 13What do you understand by true copy of a list? How is it different from shallow copy?

Accepted Answer

True copy of a list means that the elements of the original list are copied to new memory locations and the new list contains references to these new memory locations for each element of the list. Hence, in case of true copy changes made to the original list will not reflect in the copied list and vice versa.Incase of shallow copy of a list, the elements of the original list are not copied to new memory locations. Both the new list and the original list refer to the same memory locations for the elements of the list. Hence, changes made to one of the list reflect in the other list as well.

Question 11

Question 17What is the difference between sort( ) and sorted( )?

Accepted Answer

sort( )sorted( )It modifies the list it is called on. That is, the sorted list is stored in the same list; a new list is not created.It creates a new list containing a sorted version of the list passed to it as argument. It does not modify the list passed as a parameter.It works on a list and modifies it.It can take any iterable sequence type, such as a list or a tuple etc, and it always returns a sorted list irrespective of the type of sequence passed to it.It does not return anything (no return value). It modifies the list in place.It returns a newly created sorted list. It does not change the passed sequence.

Question 12

Question 7Predict the output:my_list= [ 'p', 'r', 'o', 'b', 'l' , 'e', 'm']
my_list[2:3] = []
print(my_list)
my_list[2:5] = []
print(my_list)

Accepted Answer

Output['p', 'r', 'b', 'l', 'e', 'm']
['p', 'r', 'm']
Explanationmy_list[2:3] = [] removes element at index 2 of my_list so it becomes ['p', 'r', 'b', 'l', 'e', 'm']. my_list[2:5] removes elements at indexes 2, 3, and 4 so now my_list becomes ['p', 'r', 'm'].

Question 13

Question 11Predict the output of following two parts. Are the outputs same? Are the outputs different? Why?(a)L1, L2 = [2, 4] , [2, 4]
L3 = L2                 
L2[1] = 5               
print(L3)               (b)L1, L2 = [2, 4] , [2, 4]
L3 = list(L2)
L2[1] = 5
print(L3)

Accepted Answer

Output of part (a) is:[2, 5]Output of part (b) is:[2, 4]As we can see, outputs of the two parts are different. The reason is that in part (a), the statement L3 = L2 creates a shallow copy of L2 in L3 i.e. both the variables L2 and L3 point to the same list. Hence, when element at index 1 of L2 is changed to 5, that change is visible in L3 also. On the other hand in part (b), the statement L3 = list(L2) creates a true copy (also called deep copy) of L2 so L3 points to a different list in memory which has the same elements as L2. Now when element at index 1 of L2 is changed to 5, that change is not visible in L3.

Question 14

Question 18Consider the following code and predict the result of the following statements.bieber = ['om', 'nom', 'nom']
counts = [1, 2, 3]
nums = counts
nums.append(4)counts is numscounts is add([1, 2], [3, 4])

Accepted Answer

Output is True as both nums and counts refer to the same list.This will cause an error as add function is not defined in the above code.

Source: This question is from List Manipulation, Computer Science &mdash; Class 11, CBSE Board.
Key Concepts CoveredThis question tests your understanding of the following concepts from the chapter List Manipulation: Question, Consider, Code, Predict, Result, Statements. 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 List ManipulationQ1: Question 1 Write a program to increment the elements of a list with a number. Solution lst = eval (...
Q10: Question 10 What are list slices? What for can you use them?
Q11: Question 11 Predict the output of following two parts. Are the outputs same? Are the outputs...
Q12: Question 10 Write a program that reads the n to display nth term of Fibonacci series. The Fibonacci...
Q13: Question 13 What do you understand by true copy of a list? How is it different from shallow copy?
Practice more questions from List Manipulation &mdash; Computer Science, Class 11 CBSE

Question 15

Question 19What is the output of the following code?numbers = list(range(0, 51, 4))
results = []
for number in numbers:
    if not number % 3:
        results.append(number)
print(results)

Accepted Answer

Output[0, 12, 24, 36, 48]
Explanationlist(range(0, 51, 4)) will create a list from 0 to 48 with a step of 4 so numbers will be [0, 4, 8, 12, 16, 20, 24, 28, 32, 36, 40, 44, 48]. For loop will traverse the list one number at a time. if not number % 3 means if number % 3 is equal to 0 i.e. number is divisible by 3. The numbers divisible by 3 are added to the results list and after the loop results list is printed.

Question 16

Question 20Following code prints the given list in ascending order. Modify the code so that the elements are printed in the reverse order of the result produced by the given code.numbers = list(range(0, 51, 4))
i = 0
while i < len(numbers):
    print(numbers[i] , end = " ")
    i += 3
# gives output as : 0 12 24 36 48

Accepted Answer

numbers = list(range(0, 51, 4))
i = len(numbers) - 1
while i >= 0:
    print(numbers[i] , end = " ")
    i -= 3Output48 36 24 12 0

Question 17

Question 1Write a program to increment the elements of a list with a number.Solutionlst = eval(input("Enter a list: "))
print("Existing list is:", lst)

n = int(input("Enter a number: "))

for i in range(len(lst)):
    lst[i] += n

print("List after increment:", lst)OutputEnter a list: [1, 2, 3, 4, 5]
Existing list is: [1, 2, 3, 4, 5]
Enter a number: 10
List after increment: [11, 12, 13, 14, 15]

Accepted Answer

lst=eval(input("Enter a list: "))print("Existing list is:",lst)n=int(input("Enter a number: "))foriinrange(len(lst)):lst[i]+=nprint("List after increment:",lst)OutputEnter a list: [1, 2, 3, 4, 5]Existing list is: [1, 2, 3, 4, 5]Enter a number: 10List after increment: [11, 12, 13, 14, 15]

Question 18

Question 3Write a program that inputs two lists and creates a third, that contains all elements of the first followed by all elements of the second.Solutionl1 = eval(input("Enter first list: "))
l2 = eval(input("Enter second list: "))
l3 = l1 + l2
print("Joined List:", l3)OutputEnter first list: [1, 2, 3, 4, 5]
Enter second list: [11, 12, 13, 14, 15] 
Joined List: [1, 2, 3, 4, 5, 11, 12, 13, 14, 15]

Accepted Answer

l1=eval(input("Enter first list: "))l2=eval(input("Enter second list: "))l3=l1+l2print("Joined List:",l3)OutputEnter first list: [1, 2, 3, 4, 5]Enter second list: [11, 12, 13, 14, 15] Joined List: [1, 2, 3, 4, 5, 11, 12, 13, 14, 15]

Question 19

Question 5Ask the user to enter a list of strings. Create a new list that consists of those strings with their first characters removed.Solutionl1 = eval(input("Enter a list of strings: "))
l2 = []

for i in range(len(l1)):
    l2.append(l1[i][1:])

print("List after removing first characters:")
print(l2)OutputEnter a list of strings: ["red", "green", "blue", "pink", "cyan"]
List after removing first characters:
['ed', 'reen', 'lue', 'ink', 'yan']

Accepted Answer

l1=eval(input("Enter a list of strings: "))l2=[]foriinrange(len(l1)):l2.append(l1[i][1:])print("List after removing first characters:")print(l2)OutputEnter a list of strings: ["red", "green", "blue", "pink", "cyan"]List after removing first characters:['ed', 'reen', 'lue', 'ink', 'yan']

Question 20

Question 6Write a program to check if a number is present in the list or not. If the number is present, print the position of the number. Print an appropriate message if the number is not present in the list.Solutionl = eval(input("Enter list: "))
n = int(input("Enter number to search: "))

if n in l:
    print(n, "found at index", l.index(n))
else :
    print(n, "not found in list")OutputEnter list: [1, 3, 15, 8, 20]
Enter number to search: 15
15 found at index 2

=====================================

Enter list: [1, 3, 15, 8, 20]
Enter number to search: 25
25 not found in list

Accepted Answer

l=eval(input("Enter list: "))n=int(input("Enter number to search: "))ifninl:print(n,"found at index",l.index(n))else:print(n,"not found in list")OutputEnter list: [1, 3, 15, 8, 20]Enter number to search: 1515 found at index 2=====================================Enter list: [1, 3, 15, 8, 20]Enter number to search: 2525 not found in list

List Manipulation

Multiple Choice Questions

Type A : Short Answer Questions/Conceptual Questions

Type B: Application Based Questions

Type C: Programming Practice/Knowledge based Questions