Choose the correct option with respect to python

Correct Answer : 

B). Tuples are immutable while lists are mutable

 

Preparing for Python exams or certification tests? Multiple choice
questions (MCQs) are a proven way to test your core Python knowledge. Below are
15 essential Python MCQs with detailed explanations to help you master key
concepts and avoid common pitfalls.

Top 15 Python MCQs with
Explanations

1. What
   is the output of print(type(5))?
   a) <class ‘int’>
   b) <class ‘number’>
   c) <class ‘float’>
   d) <class ‘digit’>
    Correct:
   a
   Explanation: 5 is an integer literal. Python’s type() function
   returns <class ‘int’> for integers.
2. Which
   is valid for single line comments?
   a) // Comment
   b) /* Comment */
   c) # Comment
   d) <!   Comment   >
    Correct:
   c
   Explanation: Python uses # for single line
   comments. // is for floor division, not comments.
3. What
   does “hello”[1:4] return?
   a) “hel”
   b) “ell”
   c) “llo”
   d) “lo”
    Correct:
   b
   Explanation: Slicing includes start index (1=’e’) and
   stops before end index (4=’o’), giving ‘ell’.
4. Which
   is immutable?
   a) List
   b) Dictionary
   c) Tuple
   d) Set
    Correct:
   c
   Explanation: Tuples are immutable (can’t modify after
   creation). Lists, dicts, and sets are mutable.
5. What
   is print(3 * ‘ab’)?
   a) ababab
   b) 3ab
   c) ab3
   d) Error
    Correct:
   a
   Explanation: Multiplying a string repeats it: ‘ab’ repeated
   3 times = ‘ababab’.

6. Which
   will cause a SyntaxError?
   a) print(“Hello”)
   b) x = 5
   c) if 5 > 2: print(“Five”)
   d) for = 5
    Correct:
   d
   Explanation: for is a reserved keyword. Using it as a
   variable name triggers SyntaxError.
7. What
   is the output of bool(“0”)?
   a) False
   b) True
   c) 0
   d) Error
    Correct:
   b
   Explanation: Non empty strings are True in
   Python. “0” has length 1 → True.
8. Which
   correctly opens a file for reading?
   a) open(“file.txt”, “r”)
   b) open(“file.txt”, “read”)
   c) open(“file.txt”, “w”)
   d) open(“file.txt”)
    Correct:
   a & d
   Explanation: “r” is the explicit read mode,
   but open() defaults to read mode if omitted.

Tricky Function &
OOP Scenarios

9. What
   does this return?

python

def func(x, y=[]):

    y.append(x)

    return y

print(func(1), func(2))

a) [1] [2]
b) [1] [1,2]
c) [1] [2]
d) [1] [1]
 Correct: b
Explanation: Mutable default arguments (y=[]) persist between calls
→ both modify same list.

10. What
    is method overriding?
    a) Changing method names
    b) Redefining a parent method in child class
    c) Deleting inherited methods
    d) Hiding private methods
     Correct:
    b
    Explanation: Overriding = Child class provides specific
    implementation for inherited method.

Python MCQ Cheat Sheet:

Quick Reference

Concept	Key Rule	Example Trick
Slicing	start:stop:step (stop excluded)	“Python”[1:4] → “yth”
Mutability	Lists/dicts/sets mutable; tuples/strings/frozensets immutable	t = (1,); t[0]=2 → Error
Truthiness	False: 0, “”, None, [], {}	bool([]) → False
Scope	global keyword modifies global vars	Without global, assignment creates local
is vs ==	is checks identity (memory address); == checks value	[] is [] → False

Pro Tips for Python MCQ
Tests

1. Watch
   for off by one errors in loops/slicing (e.g., range(5) =
   0 4)
2. Remember
   operator precedence: ** > % > // > + (use () when
   unsure)
3. Immutable
   objects aren’t copied in function args (changes create new
   objects)
4. print(0.1
   + 0.2 == 0.3) → False (floating point precision quirk)

Final Answer Key for Sample
MCQs:

Q#	Answer	Q#	Answer
1	a	6	d
2	c	7	b
3	b	8	a, d
4	c	9	b
5	a	10	b