Python MCQs

Question 1

What is the difference between a list and a tuple in Python?

Accepted Answer

A list is mutable and can be changed after creation, while a tuple is immutable

Answer

A tuple is mutable, while a list is immutable

Answer

Both are immutable and behave identically

Answer

A list can only store numbers, while a tuple can store any type

Question 2

What does the *args syntax allow a Python function to accept?

Accepted Answer

A variable number of positional arguments, collected into a tuple

Answer

A variable number of keyword arguments, collected into a dictionary

Answer

Exactly one optional argument

Answer

A fixed number of arguments defined at import time

Question 3

What is a Python decorator?

Accepted Answer

A function that wraps another function to modify or extend its behavior without changing its actual code

Answer

A special type of comment used for documentation

Answer

A built-in data type for storing key-value pairs

Answer

A tool used only for formatting code style

Question 4

What is the purpose of the __init__ method in a Python class?

Accepted Answer

It acts as the constructor, initializing a new object's attributes when it is created

Answer

It deletes an object from memory when called

Answer

It defines a static method for the class

Answer

It converts an object into a string representation

Question 5

What is the difference between '==' and 'is' in Python?

Accepted Answer

'==' compares the values of two objects, while 'is' checks whether they are the same object in memory

Answer

'is' compares values, while '==' checks memory location

Answer

Both operators behave identically in all cases

Answer

'is' can only be used with numbers, not other data types

Question 6

What is a list comprehension in Python?

Accepted Answer

A concise way to create a list by applying an expression to each item in an iterable, optionally with a condition

Answer

A method for sorting a list in place

Answer

A built-in function for converting a list to a tuple

Answer

A way to permanently lock a list so it cannot be modified

Question 7

What does the Python 'self' parameter refer to inside a class method?

Accepted Answer

The current instance of the class on which the method is being called

Answer

The parent class of the current class

Answer

A global variable shared across all instances

Answer

The name of the class itself

Question 8

What is the purpose of Python's 'with' statement when working with files?

Accepted Answer

It ensures the file is automatically closed once the block of code finishes, even if an error occurs

Answer

It opens a file in a special read-only mode permanently

Answer

It creates a backup copy of the file automatically

Answer

It converts the file's contents into a Python list

Question 9

What is the output of the following expression in Python: type(5 / 2)?

Accepted Answer

float

Answer

int

Answer

str

Answer

bool

Question 10

What is a Python generator?

Accepted Answer

A function that uses 'yield' to produce a sequence of values lazily, one at a time, instead of returning them all at once

Answer

A tool for generating random numbers only

Answer

A built-in class used for creating new Python modules

Answer

A function that always runs faster than a normal function

Question 11

What is the difference between a shallow copy and a deep copy in Python?

Accepted Answer

A shallow copy duplicates the outer object but still references the same nested objects, while a deep copy duplicates everything recursively

Answer

A deep copy only works with strings, while a shallow copy works with any type

Answer

Both copy types behave identically in every case

Answer

A shallow copy is always faster but produces an entirely independent object

Question 12

What does the Python 'pass' statement do?

Accepted Answer

It acts as a placeholder that does nothing, allowing code to run without implementing logic yet

Answer

It permanently skips the rest of the current loop iteration

Answer

It exits the current function immediately

Answer

It raises an exception intentionally

Question 13

What is the purpose of Python's try-except block?

Accepted Answer

To catch and handle exceptions that occur during the execution of code, preventing the program from crashing

Answer

To permanently prevent any error from occurring in the code

Answer

To repeat a block of code a fixed number of times

Answer

To define a new function inside another function

Question 14

What does the Python built-in function 'zip()' do?

Accepted Answer

Combines multiple iterables element-wise into tuples

Answer

Compresses a file into a smaller size

Answer

Sorts a list in ascending order

Answer

Removes duplicate values from a list

Question 15

What is the key difference between a Python set and a list?

Accepted Answer

A set stores only unique, unordered elements, while a list can store duplicates in a defined order

Answer

A set can store duplicate values, while a list cannot

Answer

A list is always faster to search than a set

Answer

Both behave identically in terms of ordering and uniqueness

Question 16

What does the Python keyword 'global' do inside a function?

Accepted Answer

It allows the function to modify a variable defined outside its local scope, at the module level

Answer

It creates a new variable that is only accessible inside that function

Answer

It permanently deletes a variable from memory

Answer

It converts a local variable into a constant

Question 17

What is the result of evaluating '3' + '4' in Python?

Accepted Answer

'34'

Answer

7

Answer

'7'

Answer

Error, since strings cannot be added

Question 18

What is the purpose of the Python 'enumerate()' function?

Accepted Answer

It returns both the index and the value of each item while looping over an iterable

Answer

It converts a list into a dictionary

Answer

It removes duplicate values from an iterable

Answer

It reverses the order of elements in an iterable

Question 19

What does Python's Global Interpreter Lock (GIL) do?

Accepted Answer

It ensures that only one thread executes Python bytecode at a time within a single process

Answer

It permanently prevents Python programs from using more than one variable at a time

Answer

It locks a file so other programs cannot access it

Answer

It restricts Python programs to running only on a single operating system

Question 20

What is the difference between append() and extend() when used on a Python list?

Accepted Answer

append() adds a single item to the end of the list, while extend() adds all items from an iterable individually

Answer

extend() adds a single item, while append() adds multiple items

Answer

Both methods behave identically in every case

Answer

append() can only be used with numbers, while extend() works with any type

Question 21

What is the output of bool(0) in Python?

Accepted Answer

False

Answer

True

Answer

0

Answer

Error

Question 22

What is a lambda expression in Java used for?

Accepted Answer

It provides a concise way to represent an instance of a functional interface, often for short pieces of behavior

Answer

It defines a new class hierarchy

Answer

It permanently deletes a method from a class

Answer

It converts primitive types into objects

Question 23

What is the purpose of Python's '__str__' method in a class?

Accepted Answer

It defines how an object should be represented as a readable string, mainly for end users

Answer

It defines how an object is stored in memory

Answer

It permanently deletes an object

Answer

It converts an object into a list

Question 24

What does Python's 'is not' operator check for?

Accepted Answer

Whether two variables do not refer to the same object in memory

Answer

Whether two values are not equal in content

Answer

Whether a variable is not a string

Answer

Whether a list is not empty

Question 25

What is the purpose of Python's 'assert' statement?

Accepted Answer

It checks that a condition is true and raises an AssertionError if it is not, often used for debugging

Answer

It permanently stops the program regardless of any condition

Answer

It creates a new variable

Answer

It imports a module into the current script

Question 26

What does the Python 'range()' function return?

Accepted Answer

An immutable sequence of numbers that can be iterated over, generated lazily

Answer

A list of all even numbers up to a limit

Answer

A dictionary of key value pairs

Answer

A copy of an existing list

Question 27

What is the difference between a Python module and a package?

Accepted Answer

A module is a single Python file, while a package is a directory containing multiple modules along with an init file

Answer

A module can only contain functions, while a package can only contain classes

Answer

There is no real difference between the two terms

Answer

A package can only be used for built-in Python features

Question 28

What is the purpose of Python's 'super()' function?

Accepted Answer

It allows a subclass to call methods defined in its parent class, often used inside an overridden method

Answer

It permanently deletes the parent class

Answer

It converts a class into a function

Answer

It creates a copy of the current object

Question 29

What does Python's 'in' keyword check when used with a list, such as 'x in my_list'?

Accepted Answer

Whether the value x exists as an element somewhere within the list

Answer

Whether x is the first element of the list

Answer

Whether the list is completely empty

Answer

Whether x is a valid variable name

Question 30

What is a Python namedtuple used for?

Accepted Answer

It creates a lightweight, immutable object with named fields, combining the simplicity of a tuple with readable attribute access

Answer

It creates a mutable dictionary with default values

Answer

It permanently renames an existing tuple

Answer

It converts a list into a set automatically

Question 31

What is the purpose of the Python '__len__' method in a custom class?

Accepted Answer

It defines what the built-in len() function should return when called on an instance of that class

Answer

It defines how many methods a class has

Answer

It permanently limits the size of an object

Answer

It automatically deletes extra elements from a list

Question 32

What does the Python 'any()' function do when applied to an iterable?

Accepted Answer

It returns True if at least one element in the iterable is truthy

Answer

It returns True only if every element in the iterable is truthy

Answer

It returns the count of truthy elements

Answer

It converts every element to a boolean and prints them

Question 33

What is the purpose of Python's 'map()' function?

Accepted Answer

It applies a given function to every item in an iterable and returns an iterator of the results

Answer

It filters out items from an iterable that do not meet a condition

Answer

It sorts the items of an iterable in ascending order

Answer

It permanently changes the original iterable in place

Question 34

What is the difference between Python's 'append()' and 'insert()' methods for lists?

Accepted Answer

append() adds an item to the end of the list, while insert() adds an item at a specified index

Answer

append() adds an item at a specified index, while insert() always adds to the end

Answer

Both methods only work with strings, not with general list elements

Answer

append() removes an item while insert() adds one

Question 35

What is the purpose of Python's context manager protocol, implemented with '__enter__' and '__exit__'?

Accepted Answer

It allows an object to manage setup and cleanup automatically when used with the 'with' statement

Answer

It allows a class to inherit from multiple base classes

Answer

It converts a class into a decorator

Answer

It is used only for reading command line arguments

Question 36

What does the Python expression 'list(range(5))' produce?

Accepted Answer

[0, 1, 2, 3, 4]

Answer

[1, 2, 3, 4, 5]

Answer

[0, 1, 2, 3, 4, 5]

Answer

[5, 4, 3, 2, 1, 0]

Question 37

What is the purpose of Python's 'sorted()' function compared to the list's own 'sort()' method?

Accepted Answer

sorted() returns a new sorted list without changing the original, while sort() sorts a list in place

Answer

sorted() only works on numbers, while sort() works on any data type

Answer

sort() always creates a new list, while sorted() changes the list in place

Answer

There is no difference between the two

Question 38

What is a Python f-string used for?

Accepted Answer

It provides a convenient way to embed expressions directly inside string literals for formatting

Answer

It converts a string into a floating point number

Answer

It permanently freezes a string so it cannot be changed

Answer

It is used only for reading files

Question 39

What does the Python 'del' statement do when used on a list element, such as 'del my_list[0]'?

Accepted Answer

It removes the element at that index from the list

Answer

It sets the element at that index to None without removing it

Answer

It deletes the entire list, not just one element

Answer

It only works on dictionaries, not lists

Question 40

What is the output of the expression '2 ** 3' in Python?

Accepted Answer

8

Answer

6

Answer

9

Answer

5

Question 41

What is the purpose of Python's '*args' and '**kwargs' when combined in a single function definition?

Accepted Answer

They allow a function to accept any number of positional arguments and any number of keyword arguments respectively

Answer

They only allow exactly two arguments to be passed to a function

Answer

They are used to permanently restrict a function to zero arguments

Answer

They convert a function into a class

Question 42

What is the purpose of Python's 'isinstance()' function?

Accepted Answer

It checks whether an object belongs to a specified class or type, including subclasses

Answer

It converts an object into a different type

Answer

It permanently changes the type of a variable

Answer

It checks whether two objects occupy the same memory address

Question 43

What does Python's 'dict.get()' method do differently compared to using square brackets to access a dictionary key?

Accepted Answer

get() returns a default value, such as None, instead of raising an error when the key does not exist

Answer

get() always raises an error if the key is missing, unlike square brackets

Answer

get() can only be used with numeric keys

Answer

get() permanently removes the key after reading its value

Question 44

What is the purpose of a Python virtual environment?

Accepted Answer

It creates an isolated space with its own installed packages, separate from the system-wide Python installation

Answer

It speeds up the execution of Python code automatically

Answer

It converts Python code into another programming language

Answer

It compiles Python scripts into standalone executables

Question 45

What does the Python 'continue' statement do inside a loop?

Accepted Answer

It skips the rest of the current iteration and moves on to the next one

Answer

It stops the loop entirely

Answer

It restarts the loop from the very beginning

Answer

It pauses the program until user input is given

Question 46

What is the purpose of Python's 'itertools' module?

Accepted Answer

It provides efficient tools for creating and working with iterators, such as combinations and infinite counters

Answer

It handles file input and output operations

Answer

It is used exclusively for handling exceptions

Answer

It manages network socket connections

Question 47

What is the output of 'type([])' in Python?

Accepted Answer

Answer

Answer

Answer

Question 48

Which of the following data types in Python is IMMUTABLE?

Accepted Answer

Tuple

Answer

List

Answer

Dictionary

Answer

Set

Question 49

Which of the following built-in data types in Python is immutable?

Accepted Answer

tuple

Answer

list

Answer

dict

Answer

set

Question 50

What is the result of list(set([1, 2, 2, 3, 4, 4])) in Python?

Accepted Answer

[1, 2, 3, 4]

Answer

[1, 2, 2, 3, 4, 4]

Answer

{1, 2, 3, 4}

Answer

TypeError

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