Chapter Exam

Chapter 10: Python Classes and Objects — Online MCQ Test

Q: What is the correct syntax to define a class in Python?

Answer: A. class ClassName: — In Python, a class is defined using the keyword `class` followed by the class name and a colon.

Q: Which special method is automatically called when an object is created from a class?

Answer: B. __init__() — The `__init__()` method is the constructor and is called automatically when an object is created.

Q: What will be the output of the following code? class Test: def __init__(self): print('Hello') obj = Test()

Answer: B. Hello — When `obj = Test()` is executed, the constructor `__init__()` runs and prints `Hello`.

Q: What will be the output of the following code? class Box: def __init__(self, x): self.x = x b1 = Box(10) print(b1.x)

Answer: B. 10 — The constructor stores the value `10` in `self.x`, so `b1.x` prints `10`.

COMPUTER SCIENCE · CLASS 12th · Tamil Nadu State Board

Practice Chapter 10: Python Classes and Objects with a free chapter-wise online MCQ test for Tamil Nadu State Board CLASS 12th COMPUTER SCIENCE. This chapter covers: An introduction to object-oriented programming concepts in Python. It covers class definitions object instantiation class constructors destructor methods private and public data me.... AI-generated questions from basic to board-exam level, with instant results and explanations.

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Chapter 10: Python Classes and Objects — Important Questions & Answers (FAQ)

Frequently asked questions from Tamil Nadu State Board CLASS 12th COMPUTER SCIENCE — Chapter 10: Python Classes and Objects, with answers and explanations. These are sample questions; the exam has its own separate question set.

What is the correct syntax to define a class in Python?

A. class ClassName: ✓
B. def ClassName():
C. create ClassName:
D. new ClassName()

Answer: A. class ClassName:
In Python, a class is defined using the keyword `class` followed by the class name and a colon.

Which special method is automatically called when an object is created from a class?

A. __del__()
B. __init__() ✓
C. __str__()
D. __main__()

Answer: B. __init__()
The `__init__()` method is the constructor and is called automatically when an object is created.

What will be the output of the following code? class Test: def __init__(self): print('Hello') obj = Test()

A. Test
B. Hello ✓
C. No output
D. Error

Answer: B. Hello
When `obj = Test()` is executed, the constructor `__init__()` runs and prints `Hello`.

What will be the output of the following code? class Box: def __init__(self, x): self.x = x b1 = Box(10) print(b1.x)

A. x
B. 10 ✓
C. Box(10)
D. Error

Answer: B. 10
The constructor stores the value `10` in `self.x`, so `b1.x` prints `10`.

Which statement about name mangling in Python is most accurate?

A. A variable named `__x` becomes completely inaccessible in all situations
B. A variable named `__x` is internally renamed to help avoid direct access from outside the class ✓
C. A variable named `_x` is treated as a public variable
D. Name mangling is used only for function names, not variables

Answer: B. A variable named `__x` is internally renamed to help avoid direct access from outside the class
Python changes the name of double-underscore attributes internally to reduce accidental access from outside the class.