WB JECA MCA Operating System Previous Year Questions (PYQs) – Page 1 of 5
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Showing 45 questions
Which one is not a part of Process Control Block (PCB)?
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Solution
PCB stores process state, PC, registers but not source code.
In the process lifecycle, the queue where processes wait for CPU allocation is called the ______ queue.
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Solution
Ready queue holds processes waiting for CPU.
In an operating system, a thread is best described as
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Solution
Thread is the smallest schedulable unit.
Which of the following scheduling algorithms can work in both preemptive and non-preemptive modes?
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Solution
Priority scheduling can be both preemptive and non-preemptive.
Which of the following is a deadlock avoidance algorithm?
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Solution
Banker’s algorithm is used for deadlock avoidance.
Which type of fragmentation occurs inside allocated memory blocks?
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Solution
Internal fragmentation occurs within allocated blocks.
Which of the following statements is true about paging and fragmentation?
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Solution
Paging removes external fragmentation but may have internal fragmentation.
Each stage in pipelining should be completed within _________cycles.
(A) 1
(b) 2
(C) 3
(D) 4
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Solution
- In pipelining, the CPU instruction is divided into stages (Fetch, Decode, Execute, etc.).
- To maximize throughput, each stage must complete within 1 clock cycle.
- This ensures that new instructions can enter the pipeline without delay.
Correct Answer: (A) 1
A computer with a 32 bit wide data bus uses 4k × 8 static RAM memory chips. The smallest memory this computer is
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Solution
Each RAM chip = $4k \times 8 = 32k$ bits = 4 KB.
Bus width = 32 bits, each chip = 8 bits → need 4 chips in parallel.
Total memory = $4 \times 4$ KB = 16 KB.
Answer = (B) 16 kb
Bus width = 32 bits, each chip = 8 bits → need 4 chips in parallel.
Total memory = $4 \times 4$ KB = 16 KB.
Answer = (B) 16 kb
The permission -rwx r-- r-- represented in octal expression will be
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Solution
Solution: Owner rwx = 7, group r-- = 4, others r-- = 4 ⇒ 744.
Answer: (B) 744
Answer: (B) 744
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