Data Structures Quiz

What type of data structure is a stack?

• FIFO (First-In-First-Out)

• LIFO (Last-In-First-Out)

• Random Order Structure

• Priority-based

What operation is used to add an element to a stack?

• Enqueue

• Insert

• Push

• Append

What does the pop() operation do in a stack?

• Inserts an element at the top

• Removes the top element

• Retrieves the bottom element

• Clears all elements

What does the peek() function do in a stack?

• Removes the last element

• Returns the last element without removing it

• Clears the stack

• Checks if the stack is empty

What is an application of a stack in web browsers?

• Managing open tabs

• Storing browsing history (back button)

• Managing internet speed

• Sending HTTP requests

What is an example of a real-world stack?

• A queue in a supermarket

• A pile of plates in a cafeteria

• A waiting list at a hospital

• A playlist in a music player

Which of the following is NOT a valid stack operation?

• Push

• Pop

• Insert at index

• Peek

How do we implement a stack in Java?

• Using the Stack class from java.util package

• Using java.array class

• By creating a stack.txt file

• By calling stack.method() in Python

Which notation places operators between operands?

• Prefix

• Postfix

• Infix

• Reverse Polish

Which of the following is an example of postfix notation?

• +AB

• A+B

• AB+

• +BA