MCQs

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Overall MCQs for Reference

Which data structure is commonly used to evaluate expressions in postfix notation?
a. Queue
b. Array
c. Stack
d. Linked List
Answer: c. Stackgeeksforgeeks+2
What principle does a stack data structure operate on?
a. FIFO
b. LIFO
c. FILO
d. LILO
Answer: b. LIFOuncodemy+2
Which application utilizes stack for managing recursive function calls?
a. Expression evaluation
b. Memory management
c. Recursion
d. Sorting
Answer: c. Recursioncipherschools+2
How does a stack aid in checking parentheses balancing in code editors?
a. By storing all parentheses
b. By pushing opening and popping closing parentheses
c. By reversing parentheses order
d. By counting parentheses
Answer: b. By pushing opening and popping closing parenthesessimplilearn+2
Which operation is performed to add an element to the stack?
a. Insert
b. Add
c. Push
d. Place
Answer: c. Pushexamveda+2
Which stack operation removes the top element?
a. Insert
b. Add
c. Remove
d. Pop
Answer: d. Popuncodemy+1
Undo functionality in text editors uses which data structure?
a. Queue
b. Stack
c. Heap
d. Set
Answer: b. Stackalmabetter+2
Which algorithm’s implementation makes extensive use of stacks for state storage and backtracking?
a. Merge Sort
b. Quick Sort
c. Backtracking
d. Bubble Sort
Answer: c. Backtrackingsimplilearn+1
In data science, which traversal algorithm for graphs uses stack?
a. Breadth-First Search
b. Depth-First Search
c. A* Search
d. Dijkstra’s Algorithm
Answer: b. Depth-First Searchw3schools+1
What role does a stack play in function call management?
a. Stores function outputs
b. Tracks active functions and return addresses
c. Optimizes function speed
d. Runs functions in parallel
Answer: b. Tracks active functions and return addressesacceldata+1
For which of the following is a stack NOT the preferred data structure?
a. Reversing strings
b. Browser history navigation
c. Evaluating postfix expressions
d. Sorting arrays
Answer: d. Sorting arrayseicta.iitk+2
What is the main advantage of using stack for memory management?
a. Supports random access
b. Enables efficient allocation and deallocation
c. Can handle large datasets
d. Supports multiple data types
Answer: b. Enables efficient allocation and deallocationgeeksforgeeks+1
Which process uses a stack to track visited URLs for back and forward navigation?
a. Text processing
b. Browser history
c. Data mining
d. Encryption
Answer: b. Browser historyenjoyalgorithms+2
What happens when you ‘undo’ an action in a text editor?
a. Action is removed from queue
b. Action is pushed to stack
c. Action is popped from stack
d. Action is overwritten
Answer: c. Action is popped from stackalmabetter+2
Which conversion is efficiently performed using stack?
a. Array to list
b. CSV to JSON
c. Infix to postfix
d. String to binary
Answer: c. Infix to postfixsanfoundry+1
What is the time complexity of push and pop operations in a stack?
a. O(log n)
b. O(n)
c. O(1)
d. O(n^2)
Answer: c. O(1)examveda+1
Which structure does the system use to manage function call stack during recursion?
a. Queue
b. Tree
c. Stack
d. Graph
Answer: c. Stacksanfoundry+1
What stack-based approach is used to validate syntax in code editors?
a. Counting lines
b. Matching paired elements
c. Tracking loops
d. Analyzing tokens
Answer: b. Matching paired elementseicta.iitk+2
Which problem is an example of stack use in competitive programming?
a. Next Greater Element
b. Least Common Ancestor
c. Shortest Path
d. Binary Search
Answer: a. Next Greater Elementgeeksforgeeks
Stacks are commonly used to reverse which data structure?
a. Tree
b. String
c. Graph
d. Heap
Answer: b. Stringsimplilearn+1
Parentheses checking in an expression uses stack by:
a. Pairing numbers
b. Storing operators
c. Matching opening and closing symbols
d. Rotating tokens
Answer: c. Matching opening and closing symbolscipherschools+1
Which stack application helps evaluate complex mathematical expressions in compilers?
a. Hashing
b. Expression parsing
c. Sorting
d. Indexing
Answer: b. Expression parsingacceldata+2
Which data structure aids in maintaining the undo-redo history in applications?
a. Tree
b. Queue
c. Heap
d. Stack
Answer: d. Stackenjoyalgorithms+1
A stack is most efficient for which type of access pattern?
a. Random
b. First-In, First-Out
c. Last-In, First-Out
d. Middle-Out
Answer: c. Last-In, First-Outuncodemy+1
Which application uses multiple stacks for forward and backward navigation?
a. Calculator
b. Browser
c. Interpreter
d. Graph traversal
Answer: b. Browserherovired+2
In which use case does each ‘redo’ operation pop from one stack and push onto another?
a. Syntax checking
b. Undo/Redo in editors
c. Graph traversal
d. Expression evaluation
Answer: b. Undo/Redo in editorsalmabetter+1
The call stack in programming languages mainly stores:
a. Program outputs
b. Variable values
c. Function calls and addresses
d. User input
Answer: c. Function calls and addressesacceldata+2
In Depth-First Search, when does a node get removed from the stack?
a. After visiting all adjacent nodes
b. When it is visited
c. When its value is updated
d. At the beginning
Answer: a. After visiting all adjacent nodesw3schools+1
Where is stack-based expression conversion widely used?
a. Data cleaning
b. Tokenization
c. Expression evaluation in compilers
d. Histogram analysis
Answer: c. Expression evaluation in compilerssanfoundry+2
Which real-life process closely resembles a stack?
a. Library queue
b. Parking garage
c. Restaurant ordering system
d. Search engine indexing
Answer: b. Parking garageupgrad+1
Undo operations in data science analytics platforms are typically managed by:
a. Array
b. Queue
c. Stack
d. Linked List
Answer: c. Stackenjoyalgorithms+2
Stacks support which major algorithm type in AI search trees?
a. Breadth-first traversal
b. Depth-first traversal
c. Uniform cost search
d. Hill climbing
Answer: b. Depth-first traversalreddit+2
How do stacks facilitate parsing of nested structures in code?
a. By tracking variable names
b. By pushing and popping delimiters
c. By counting words
d. By sorting code blocks
Answer: b. By pushing and popping delimiterseicta.iitk+2
What happens if the stack overflows in recursion?
a. Program speeds up
b. Program hangs or crashes
c. Memory is freed
d. Output is multiplied
Answer: b. Program hangs or crashesgeeksforgeeks+1
In data pipelines, temporary state storage between steps is managed by:
a. Data frames
b. Queues
c. Stacks
d. Heaps
Answer: c. Stacksuncodemy+1
Which application of stack is prevalent in undo-redo features in image editors?
a. Heap sorting
b. Stack-based command history
c. Hashing
d. Tree building
Answer: b. Stack-based command historyalmabetter+2
Which memory region is used in most programming languages to implement stacks for function calls?
a. Heap
b. Data section
c. Code segment
d. Stack segment
Answer: d. Stack segmentsimplilearn+2
Which stack operation retrieves the top element without removing it?
a. Insert
b. Peek
c. Pull
d. Remove
Answer: b. Peeksanfoundry+2
What solution do stacks provide in balancing HTML/XML tags during document parsing?
a. Random shuffling
b. Matching open and close tags
c. Removing tags
d. Duplicating tags
Answer: b. Matching open and close tagscipherschools+2
The implementation of recursion relies on:
a. Queue
b. Heap
c. Stack
d. Tree
Answer: c. Stackgeeksforgeeks+1
Which data structure manages function return addresses in modern CPUs?
a. Hash table
b. Stack
c. Queue
d. Array
Answer: b. Stackacceldata+1
Which is NOT a typical stack-based application?
a. Depth-First Search
b. Expression parsing
c. Undo operation
d. Binary Search
Answer: d. Binary Searcheicta.iitk+2
The process of converting infix expressions to prefix expressions is handled by:
a. Graphs
b. Arrays
c. Stacks
d. Trees
Answer: c. Stackssanfoundry+1
Stacks help in which classic computer science problem involving disks?
a. Tower of Hanoi
b. Merge Sort
c. Hash Table
d. Priority Queue
Answer: a. Tower of Hanoisanfoundry
What is a common use for stack in machine learning pipeline orchestration?
a. Feature scaling
b. Steering pipeline state and rollback
c. Hyperparameter tuning
d. Model selection
Answer: b. Steering pipeline state and rollbackuncodemy+1
Which application of stack allows reversing the order of data elements?
a. Queuing
b. Indexing
c. Reversing string
d. Hashing
Answer: c. Reversing stringsimplilearn+1
In which scenario does stack help ensure matching of function entry and exit points?
a. Data normalization
b. Function call management
c. Feature transformation
d. Data augmentation
Answer: b. Function call managementacceldata+2
The N-Queens problem uses stack in which context?
a. Hashing state
b. Marking threats
c. Solution backtracking
d. Visualizing outputs
Answer: c. Solution backtrackingcipherschools+1
What would a stack’s LIFO property best facilitate?
a. Data loading
b. Batch processing
c. Undo operations
d. Output printing
Answer: c. Undo operationsalmabetter+1
Which data structure is used to convert decimal to binary representation?
a. Tree
b. Queue
c. Stack
d. Heap
Answer: c. Stackuncodemy+1

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