Class 11 Computer Science Chapter 8: Strings – NCERT Solutions with PDF

Exercise: NCERT Solutions Computer Science Chapter 8 Strings (2025-26)

1. Consider the following string mySubject:

mySubject = "Computer Science"

What will be the output of the following string operations:

1. print(mySubject[0:len(mySubject)])
   Answer: Computer Science
2. print(mySubject[-7:-1])
   Answer: Scienc
3. print(mySubject[::2])
   Answer: Cmue cec
4. print(mySubject[len(mySubject)-1])
   Answer: e
5. print(2*mySubject)
   Answer: Computer ScienceComputer Science
6. print(mySubject[::-2])
   Answer: eniSrtpo
7. print(mySubject[:3] + mySubject[3:])
   Answer: Computer Science
8. print(mySubject.swapcase())
   Answer: cOMPUTER sCIENCE
9. print(mySubject.startswith('Comp'))
   Answer: True
10. print(mySubject.isalpha())
    Answer: False

2. Consider the following string myAddress:

myAddress = "WZ-1,New Ganga Nagar,New Delhi"

What will be the output of the following string operations:

1. print(myAddress.lower())
   Answer: wz-1,new ganga nagar,new delhi
2. print(myAddress.upper())
   Answer: WZ-1,NEW GANGA NAGAR,NEW DELHI
3. print(myAddress.count('New'))
   Answer: 2
4. print(myAddress.find('New'))
   Answer: 5
5. print(myAddress.rfind('New'))
   Answer: 21
6. print(myAddress.split(','))
   Answer: ['WZ-1', 'New Ganga Nagar', 'New Delhi']
7. print(myAddress.split(' '))
   Answer: ['WZ-1,New', 'Ganga', 'Nagar,New', 'Delhi']
8. print(myAddress.replace('New','Old'))
   Answer: WZ-1,Old Ganga Nagar,Old Delhi
9. print(myAddress.partition(','))
   Answer: ('WZ-1', ',', 'New Ganga Nagar,New Delhi')
10. print(myAddress.index('Agra'))
    Answer: ValueError: substring not found

3. Programming Problems:

• 1. Write a program to input line(s) of text from the user until enter is pressed. Count the total number of characters in the text (including white spaces), total number of alphabets, total number of digits, total number of special symbols and total number of words in the given text. (Assume that each word is separated by one space).
  Answer:

  text = input("Enter text: ")
  char_count = len(text)
  alpha_count = sum(c.isalpha() for c in text)
  digit_count = sum(c.isdigit() for c in text)
  special_count = sum(not c.isalnum() and not c.isspace() for c in text)
  word_count = len(text.split())
  print("Total characters:", char_count)
  print("Total alphabets:", alpha_count)
  print("Total digits:", digit_count)
  print("Total special symbols:", special_count)
  print("Total words:", word_count)
    

• 2. Write a user defined function to convert a string with more than one word into title case string where string is passed as parameter. (Title case means that the first letter of each word is capitalised)
  Answer:

  def toTitleCase(st):
      return st.title()
  text = input("Enter a string: ")
  print("Title Case String:", toTitleCase(text))
    

• 3. Write a function deleteChar() which takes two parameters. One is a string and other is a character. The function should create a new string after deleting all occurrences of the character from the string and return the new string.
  Answer:

  def deleteChar(st, ch):
      return st.replace(ch, '')
  s = input("Enter string: ")
  c = input("Enter character to delete: ")
  print("Result:", deleteChar(s, c))
    

• 4. Input a string having some digits. Write a function to return the sum of digits present in this string.
  Answer:

  def sumDigits(st):
      return sum(int(c) for c in st if c.isdigit())
  s = input("Enter string with digits: ")
  print("Sum of digits:", sumDigits(s))
    

• 5. Write a function that takes a sentence as an input parameter where each word in the sentence is separated by a space. The function should replace each blank with a hyphen and then return the modified sentence.
  Answer:

  def replaceBlanks(st):
      return st.replace(' ', '-')
  s = input("Enter a sentence: ")
  print("Modified sentence:", replaceBlanks(s))
    

Mastering Python Strings with 2025-26 NCERT Solutions

Understanding strings in Python is vital for Computer Science Class 11. Our NCERT Solutions for Chapter 8 help you grasp string indexing, slicing, and methods with easy code examples and clear explanations.

Focus on practicing questions related to string operations like concatenation, repetition, and membership. These concepts often appear in board exams, so clear your basics by revising NCERT exercise problems regularly.

Use real code examples and practice daily to boost your programming confidence. Solid preparation from the 2025-26 NCERT Computer Science textbook ensures higher scores and a deeper understanding of Python strings.