Class 11 Computer Science Chapter 7 Functions – Stepwise NCERT Answers

NCERT Solutions for Computer Science Chapter 7 Functions – Exercises (2025-26)

1. Multiple choice questions.

1. Which of the following is the correct way to define a function in Python?

• (a) function myfunc():
• (b) def myfunc[]:
• (c) def myfunc():
• (d) function myfunc[]:

Answer: (c) def myfunc():

2. Which statement is used to return a value from a function?

• (a) send
• (b) output
• (c) return
• (d) exit

Answer: (c) return

3. The variables declared inside a function are called:

• (a) Global variables
• (b) Permanent variables
• (c) Local variables
• (d) Static variables

Answer: (c) Local variables

4. Which module should be imported to use mathematical functions like sqrt and factorial?

• (a) random
• (b) math
• (c) statistics
• (d) string

Answer: (b) math

2. Answer the following questions in about 30 words.

1. What is a function in Python? Give any two advantages of using functions.

Answer: A function in Python is a named group of instructions that execute a specific task when called. Two advantages of using functions are: (1) They increase program readability and organization, and (2) They promote code reusability, reducing repetition in programs.

2. What is the difference between a parameter and an argument?

Answer: A parameter is a variable used in the function definition to accept a value; an argument is the actual value passed to the function when it is called. Parameters receive arguments.

3. Define local and global variables with examples.

Answer: Local variables are defined within a function and accessible only inside it; for example, ‘x’ inside a function. Global variables are defined outside all functions and can be accessed throughout the program; for example, ‘num’ declared before all functions.

3. Answer the following questions in about 150 words.

1. Explain different types of function arguments in Python with examples.

Answer: In Python, function arguments can be positional (assigned by position), keyword (assigned by name), default (having a pre-assigned value), and variable-length arguments (accepting multiple values via *args or **kwargs). For example, in def add(a, b=5): here, b has a default value—calling add(2) uses the default; add(2,7) overrides it. Variable-length arguments allow passing any number of values.

2. Differentiate between built-in functions and user-defined functions in Python.

Answer: Built-in functions are provided by Python, like print() and len(); they can be used directly. User-defined functions are created by programmers using the def keyword to perform specific tasks according to requirements. User-defined functions enhance modularity, reusability, and program structure.

4. Match the following.

Mastering Functions in Python: Key Points and Exam Tips

Chapter 7 of NCERT Computer Science (2025-26) focuses on Python functions, a cornerstone of writing clean, modular code. Understanding these concepts helps students improve both code reusability and exam readiness.

Practicing with NCERT Solutions Computer Science Chapter 7 Functions will help you quickly identify the important function concepts, argument types, and the distinctions between local and global variables for improved understanding.

Regular review of exercise-based solutions ensures you are confident with Python’s standard library modules and practical programming skills—key for scoring top marks in your Computer Science exam!