WB JECA MCA Operating System Previous Year Questions (PYQs) – Page 1 of 4
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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
Which command changes a file's group owner?
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Solution
Solution: The Unix command to change a file's group is
Answer: (D) chgrp
chgrp (change group).Answer: (D) chgrp
Which of the following is/are not shared by threads?
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Solution
Solution: Threads share code, data, and OS resources, but each thread has its own stack and program counter.
Answer: (C) Both program counter and stack
Answer: (C) Both program counter and stack
Which one of the following is a synchronization tool?
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Solution
Solution: Semaphore is used for process synchronization, unlike pipe/socket/thread.
Answer: (C) Semaphore
Answer: (C) Semaphore
When a process is in a "Blocked" state waiting for some I/O service, once completed it goes to the ____.
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Solution
Solution: A blocked process (waiting for I/O) goes to the Ready state after I/O is completed.
Answer: (D) Ready state
Answer: (D) Ready state
A process is thrashing if ____.
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Solution
Solution: Thrashing occurs when the CPU spends most of its time handling page faults rather than executing instructions.
Answer: (B) it spends more time in paging, rather than in execution
Answer: (B) it spends more time in paging, rather than in execution
Which one of the following is deadlock avoidance algorithm ?
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Solution
Solution: Banker's algorithm checks for safe state to avoid deadlocks.
Answer: (B)
Answer: (B)
Which command is used to set the three permissions for all the three categories of users of a file ?
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Solution
Solution:
Answer: (C) chmod
chmod sets read/write/execute bits for user, group, others (e.g., chmod 744 file).Answer: (C) chmod
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