NCERT Solutions for Class 11 Computer Science Chapter 10: Tuples and Dictionaries

Exercise

1. Consider the following tuples, tuple1 and tuple2:
   

   tuple1 = (23,1,45,67,45,9,55,45)
   tuple2 = (100,200)
       

   Find the output of the following statements:
   1. print(tuple1.index(45))
      Answer: 2
   2. print(tuple1.count(45))
      Answer: 3
   3. print(tuple1 + tuple2)
      Answer: (23, 1, 45, 67, 45, 9, 55, 45, 100, 200)
   4. print(len(tuple2))
      Answer: 2
   5. print(max(tuple1))
      Answer: 67
   6. print(min(tuple1))
      Answer: 1
   7. print(sum(tuple2))
      Answer: 300
   8. print(sorted(tuple1))
      Answer: [1, 9, 23, 45, 45, 45, 55, 67]
   9. print(tuple1)
      Answer: (23, 1, 45, 67, 45, 9, 55, 45)
2. Consider the following dictionary stateCapital:

   stateCapital = {"AndhraPradesh":"Hyderabad",
   "Bihar":"Patna","Maharashtra":"Mumbai",
   "Rajasthan":"Jaipur"}
       

   Find the output of the following statements:
   1. print(stateCapital.get("Bihar"))
      Answer: Patna
   2. print(stateCapital.keys())
      Answer: dict_keys(['AndhraPradesh', 'Bihar', 'Maharashtra', 'Rajasthan'])
   3. print(stateCapital.values())
      Answer: dict_values(['Hyderabad', 'Patna', 'Mumbai', 'Jaipur'])
   4. print(stateCapital.items())
      Answer: dict_items([('AndhraPradesh', 'Hyderabad'), ('Bihar', 'Patna'), ('Maharashtra', 'Mumbai'), ('Rajasthan', 'Jaipur')])
   5. print(len(stateCapital))
      Answer: 4
   6. print("Maharashtra" in stateCapital)
      Answer: True
   7. print(stateCapital.get("Assam"))
      Answer: None
   8. del stateCapital["Rajasthan"]
      print(stateCapital)
      Answer: {'AndhraPradesh': 'Hyderabad', 'Bihar': 'Patna', 'Maharashtra': 'Mumbai'}
3. “Lists and Tuples are ordered”. Explain.
   Answer: In both lists and tuples, the elements are stored in a specific sequence. Each element has a fixed position, which is known as its index. This means we can access elements by their position, making lists and tuples ordered collections.
4. With the help of an example show how can you return more than one value from a function.
   Answer: In Python, a function can return multiple values by using a tuple. For example:

   def operation(a, b):
       sum = a + b
       product = a * b
       return sum, product
   
   x, y = operation(5, 3)
   print(x)   # Output: 8
   print(y)   # Output: 15
   

   In this example, the function returns both sum and product.
5. What advantages do tuples have over lists?
   Answer:
   • Tuples are immutable, so their elements cannot be changed by mistake.
   • Tuples are faster to process than lists.
   • Tuples can be used as keys in dictionaries, but lists cannot.
6. When to use tuple or dictionary in Python. Give some examples of programming situations mentioning their usefulness.
   Answer:
   • Use tuples when you need an ordered collection whose items should not change, like storing months of the year or RGB color codes.
   • Use dictionaries when you need to store data as key-value pairs, such as storing names and phone numbers or mapping student names to marks.
7. Prove with the help of an example that the variable is rebuilt in case of immutable data types.
   Answer:

   tuple1 = (1, 2, 3, 4, 5)
   tuple1[2] = 10  # This gives an error as tuples are immutable.
   # To change a value, rebuild the tuple:
   tuple1 = (1, 2, 10, 4, 5)  # The variable tuple1 is now rebuilt.
   

8. TypeError occurs while statement 2 is running. Give reason. How can it be corrected?

   >>> tuple1 = (5) #statement 1
   >>> len(tuple1) #statement 2
       

   Answer: In statement 1, tuple1 = (5) creates an integer, not a tuple. To create a single-element tuple, a comma is required: tuple1 = (5,). Now len(tuple1) will return 1.

Mastering Tuples and Dictionaries in Python

NCERT Solutions Computer Science Chapter 10 Tuples And Dictionaries (2025-26) help you understand how tuples and dictionaries work in Python. These structures are essential for storing data efficiently and tackling higher-level programming tasks at school and beyond.

By practicing with NCERT exercises, you'll discover the key differences between mutable and immutable types. Recognizing real-world uses for these Python concepts gives you an edge in solving computer science questions with speed and accuracy.

Consistent revision of chapter-wise NCERT solutions strengthens your foundational knowledge. Revise important examples, focus on practical applications, and you'll be well-prepared to score better in the exam!