Data Structures MCQs with Answers
Practice important Data Structures MCQs with answers and explanations.
Multiple Choice Questions
Q91: Which method should be called before pop to avoid errors in stack?
- A: isEmpty
- B: isFull
- C: top
- D: push
View Answer
A
Q92: How is a stack typically implemented using an array?
- A: Elements are inserted at the start
- B: Elements are inserted at the end
- C: Elements are inserted in the middle
- D: Elements are inserted randomly
View Answer
B
Q93: What happens in a stack when push(5) is called?
- A: The top element is returned
- B: The element is added to the top
- C: The stack is reversed
- D: The bottom element is removed
View Answer
B
Q94: Which data structure is described as LIFO?
- A: Queue
- B: Stack
- C: Array
- D: Linked List
View Answer
B
Q95: What is the result of calling pop() on an empty stack?
- A: It returns the last element
- B: It throws an exception
- C: It returns NULL
- D: It does nothing
View Answer
B
Q96: What does the top() method do in a stack?
- A: Removes the top element
- B: Returns the top element without removing it
- C: Moves to the bottom element
- D: Clears the stack
View Answer
B
Q97: What is the best case scenario for push() and pop() in an array-based stack?
- A: Insertion/removal at the start
- B: Insertion/removal in the middle
- C: Insertion/removal at the end
- D: Insertion/removal randomly
View Answer
C
Q98: What problem arises when implementing a stack using an array?
- A: Overflow if the array is full
- B: Difficulty in accessing elements
- C: Inefficient memory usage
- D: Hard to implement
View Answer
A
Q99: Why is encapsulation important in the context of ADT?
- A: It hides the implementation details
- B: It speeds up the program
- C: It provides direct access to data
- D: It makes the program complex
View Answer
A
Q100: What happens when you try to divide a number by zero in C++?
- A: The program continues
- B: It returns 0
- C: It throws a 'division by zero' exception
- D: It ignores the operation
View Answer
C