CBSE Class 9 Introduction to Python Important Subjective Questions & Answers (2026–27) | Unit 5 Artificial Intelligence

Answer:

Python is one of the most popular programming languages for Artificial Intelligence because it is simple, easy to learn, and easy to read.

It has a large collection of libraries, requires fewer lines of code, supports rapid development, and helps developers focus on solving AI problems instead of writing complex programs.

Answer:

Modularity means dividing a large problem into smaller and manageable parts.

Python supports modular programming by allowing programmers to organize code into functions, modules, and libraries. This makes programs easier to understand, maintain, test, and reuse.

Answer:

Python is widely used in many fields, including:

• Artificial Intelligence and Machine Learning
• Software and Web Application Development
• Game Development and Online Learning Platforms

Answer:

A variable is a named memory location used to store data in a program.

Example:

age = 15
name = "Rohan"

Here, age and name are variables that store different types of values.

Answer:

• Integer (int): Stores whole numbers without decimal points.
  Example: 25
• Float: Stores decimal numbers.
  Example: 98.5
• String (str): Stores text enclosed within single or double quotation marks.
  Example: "Artificial Intelligence"

Answer:

Type Conversion is the process of converting one data type into another.

The input() function always returns data as a string. Therefore, numerical calculations require conversion to int or float.

Example:

age = int(input("Enter your age: "))

This converts the user's input into an integer before performing calculations.

Answer:

Logical operators combine multiple conditions and return either True or False.

The three logical operators are:

• and
• or
• not

Answer:

average = (s1 + s2 + s3) / 3

This expression adds the marks of the three subjects and divides the total by 3 to calculate the average.

Answer:

The if...elif...else statement is used for decision-making in Python.

• if checks the first condition.
• elif checks one or more additional conditions if the previous condition is false.
• else executes when none of the conditions are true.

This allows a program to perform different actions based on different situations.

Answer:

age = int(input("Enter your age: "))

if age >= 18:
    print("Eligible to Vote")
else:
    print("Not Eligible to Vote")

The program checks whether the entered age is 18 or above. If true, the person is eligible to vote; otherwise, they are not eligible.

Answer:

sum = 0

for i in range(1, 11):
    sum = sum + i

print(sum)

The loop adds each number from 1 to 10 and stores the result in the variable sum. The final output is 55.

Answer:

Python uses indentation (spaces at the beginning of a line) to define blocks of code.

It indicates which statements belong to an if statement, loop, or function. Incorrect indentation results in an IndentationError, causing the program to fail.

Answer:

A Python List is an ordered collection of multiple items stored in a single variable.

Lists are created using square brackets [].

Example:

students = ["Arjun", "Sonal", "Isha"]

Answer:

• append() – Adds a new element to the end of the list.
• remove() – Removes a specified element from the list.
• sort() – Arranges the list elements in ascending order.

Answer:

The len() function returns the total number of elements present in a list, string, or other collection.

Example:

names = ["Aman", "Riya", "Neha"]

print(len(names))

Output:

3

Answer:

Since 1 kilometre = 1000 metres, we use the multiplication operator (*).

Python Statement:

meters = 5 * 1000
print(meters)

Output:

5000

Answer:

Output:

30

Explanation:

The variable x is an integer, while y is a string.

The function int(y) converts the string "20" into the integer 20. Therefore, Python performs numerical addition:

10 + 20 = 30

Answer:

participants.append("Jay")

participants.remove("Vikram")

After executing these statements, the list becomes:

["Arjun", "Sonakshi", "Jay"]

Answer:

A while loop is more suitable because the number of attempts is unknown.

The loop continues until the user enters the correct password, whereas a for loop is generally used when the number of iterations is already known.

Therefore, a while loop provides greater flexibility for situations where the stopping condition depends on user input.

Answer:

bill_amount = float(input("Enter Bill Amount: "))

if bill_amount > 2000:
    discount = bill_amount * 0.10
    final_bill = bill_amount - discount
else:
    final_bill = bill_amount

print("Final Bill =", final_bill)

The program calculates a 10% discount only when the bill amount exceeds ₹2000; otherwise, the original bill amount is displayed.