Consider the code: x = [10, 20, 30]; y = x; y[0] = 99; print(x[0]). What is the output?

The correct answer is B: 99. y = x creates a reference to the same list, not a copy. Modifying y also modifies x.

What will be the output of the following code? x = [1, 2, 3] x.append([4, 5]) print(len(x))

The correct answer is B: 4. append() adds the entire list [4, 5] as a single element. So x becomes [1, 2, 3, [4, 5]] with length 4.

What is the output of: print(2 ** 3 ** 2)?

The correct answer is A: 512. The ** operator is right-associative. So 2 ** 3 ** 2 = 2 ** (3 ** 2) = 2 ** 9 = 512.

What will be the output of: x = 5; y = x; y = 10; print(x)?

The correct answer is A: 5. x and y are separate variables. Assigning y = 10 doesn't change x, which remains 5.

Which of the following is an immutable data type in Python?

The correct answer is C: tuple. Tuples are immutable, meaning their elements cannot be changed after creation. Lists, dictionaries, and sets are mutable.

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Python Programming

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56 Q 2 Topics Take Mock Test

Difficulty: All Easy Medium Hard 51–56 of 56

Topics in Python Programming

All Basics & Syntax 100 Data Types & Lists 19

Q.51 Medium Basics & Syntax

Which of the following is a mutable data type in Python?

A String

B Integer

C List

D Tuple

Correct Answer: C. List

EXPLANATION

Lists are mutable, meaning their elements can be changed after creation. Strings, integers, and tuples are immutable.

Test

Q.52 Medium Basics & Syntax

What will be the output of: 'Hello' * 2?

A 'HelloHello'

B Error

C 'Hello' concatenated twice

D HelloHello

Correct Answer: A. 'HelloHello'

EXPLANATION

String multiplication repeats the string. 'Hello' * 2 produces 'HelloHello'.

Test

Q.53 Medium Basics & Syntax

Which method is used to add an element to a Python list?

A add()

B append()

C insert()

D Both B and C

Correct Answer: D. Both B and C

EXPLANATION

append() adds an element at the end, while insert() adds at a specific position. Both are valid methods.

Test

Q.54 Medium Basics & Syntax

Which of the following will create an empty dictionary?

A {}

B {:}

C dict()

D Both A and C

Correct Answer: D. Both A and C

EXPLANATION

{} and dict() both create empty dictionaries. {} is more concise while dict() is explicit.

Test

Q.55 Medium Basics & Syntax

Which operator is used for integer division in Python 3?

A /

B //

C %

D **

Correct Answer: B. //

EXPLANATION

The '//' operator performs floor division and returns an integer, while '/' returns a float in Python 3.

Test

Q.56 Medium Basics & Syntax

Which data type is immutable in Python?

A List

B Dictionary

C Tuple

D Set

Correct Answer: C. Tuple

EXPLANATION

Tuples are immutable sequences in Python. Once created, their elements cannot be modified, unlike lists.

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