WBJECA 2025 — Computer PYQ

Q: How do I solve WBJECA 2025 Computer questions?

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Q: What is the difficulty level of WBJECA Computer questions?

WBJECA Computer questions range from moderate to advanced difficulty. Consistent practice with official previous year papers and topic-wise drills on Mathem Solvex is the most effective preparation strategy.

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Question

WBJECA 2025 — Computer PYQ

WBJECA | Computer | 2025

Five elements P, Q, R, S, T are pushed onto a stack starting from P. The stack is then popped 4 times, and each popped element is inserted into a queue. Two elements are then deleted from the queue and pushed back onto the stack. Finally, one element is popped from the stack. What will be the popped element?

Choose the correct answer:

Explanation

Initial Push: Elements P, Q, R, S, T are pushed onto the stack.
- Stack (top to bottom): [T,S,R,Q,P]
Pop 4 times and Enqueue:
- Pop 1: T (Queue: [T])
- Pop 2: S (Queue: [T,S])
- Pop 3: R (Queue: [T,S,R])
- Pop 4: Q (Queue: [T,S,R,Q])
- Stack remains: [P]
Delete 2 from Queue and Push to Stack:
- Delete 1 (FIFO): T is removed from the queue and pushed onto the stack.
  - Stack: [T,P]
- Delete 2 (FIFO): S is removed from the queue and pushed onto the stack.
  - Stack: [S,T,P]
Final Pop:
- Popping from the stack (top element): S

Correct Answer: (D) S