Chapter Exam

Chapter 7: Python Functions — Online MCQ Test

Q: What is the main advantage of using functions in Python?

Answer: A. They make programs more modular and reusable — Functions help break a program into smaller, reusable parts, making the code easier to read and maintain.

Q: Which keyword is used to define a function in Python?

Answer: C. def — In Python, the keyword `def` is used to create a user-defined function.

Q: What will the following function return? ```python def square(n): return n * n ``` If `square(5)` is called, what is the output?

Answer: B. 25 — The function multiplies the number by itself, so `5 * 5 = 25`.

Q: What is the output of the following code? ```python x = 10 def test(): x = 20 print(x) test() print(x) ```

Answer: C. 20 10 — Inside `test()`, `x` is a local variable with value 20. Outside the function, the global `x` remains 10.

Q: What is the output of the following code? ```python def demo(a, b=5): return a + b print(demo(3)) ```

Answer: A. 8 — `b` has a default value of 5, so `demo(3)` becomes `3 + 5 = 8`.

COMPUTER SCIENCE · CLASS 12th · Tamil Nadu State Board

Practice Chapter 7: Python Functions with a free chapter-wise online MCQ test for Tamil Nadu State Board CLASS 12th COMPUTER SCIENCE. This chapter covers: Focusing on modular programming this chapter details defining and calling user functions in Python. It explains function arguments return statements variable scope recursive functi.... AI-generated questions from basic to board-exam level, with instant results and explanations.

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Chapter 7: Python Functions — Important Questions & Answers (FAQ)

Frequently asked questions from Tamil Nadu State Board CLASS 12th COMPUTER SCIENCE — Chapter 7: Python Functions, with answers and explanations. These are sample questions; the exam has its own separate question set.

What is the main advantage of using functions in Python?

A. They make programs more modular and reusable ✓
B. They remove the need for variables
C. They always run faster than normal code
D. They can only be used in built-in libraries

Answer: A. They make programs more modular and reusable
Functions help break a program into smaller, reusable parts, making the code easier to read and maintain.

Which keyword is used to define a function in Python?

A. func
B. define
C. def ✓
D. function

Answer: C. def
In Python, the keyword `def` is used to create a user-defined function.

What will the following function return? ```python def square(n): return n * n ``` If `square(5)` is called, what is the output?

A. 10
B. 25 ✓
C. 55
D. Error

Answer: B. 25
The function multiplies the number by itself, so `5 * 5 = 25`.

What is the output of the following code? ```python x = 10 def test(): x = 20 print(x) test() print(x) ```

A. 20 20
B. 10 20
C. 20 10 ✓
D. 10 10

Answer: C. 20 10
Inside `test()`, `x` is a local variable with value 20. Outside the function, the global `x` remains 10.

What is the output of the following code? ```python def demo(a, b=5): return a + b print(demo(3)) ```

A. 8 ✓
B. 15
C. 3
D. Error because `b` is not passed

Answer: A. 8
`b` has a default value of 5, so `demo(3)` becomes `3 + 5 = 8`.

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