Operating System

26. The term "FAT" stands for ……
'FAT' का पूर्ण रूप क्या है?
(Bihar STET C.S. 12.09.2023 (Shift-I))
A. File Allocation Tree
B. File Allocation Table
C. File Allocation Graph
D. All of the above

Correct Answer: B

Explanation (EN): FAT stands for File Allocation Table. It is used to track the location of files on storage devices.

Explanation (HI): FAT का full form File Allocation Table है। यह storage में files की location track करने के लिए उपयोग होता है.

27. In which addressing mode, the operand is given explicitly in the instruction (example instruction : ADD R4, #3)?
किस addressing mode में operand instruction में सीधे दिया जाता है (जैसे ADD R4, #3)?
(KVS PGT C.S. 2017)
A. Based Indexed mode
B. Absolute mode
C. Immediate mode
D. Register indirect mode

Correct Answer: C

Explanation (EN): In immediate addressing mode, the operand is directly specified in the instruction using # symbol.

Explanation (HI): Immediate addressing mode में operand सीधे instruction में दिया जाता है (# symbol के साथ)।

28. Select the correct order of events after power is initialized on a system.
System start होने के बाद सही sequence क्या है?
(UGC NET C.S. December-2022)
A. B, C, A
B. C, A, B
C. A, B, C
D. A, C, B

Correct Answer: B

Explanation (EN): Correct sequence: Firmware ROM loads boot block → Bootstrap loader loads → Kernel loads into memory.

Explanation (HI): सही क्रम: Firmware ROM boot block load करता है → Bootstrap loader load होता है → Kernel memory में load होता है।

29. An Operating System (OS) crashes on the average once in 30 days... availability is approximately:
OS 30 दिन में एक बार crash होता है और 10 मिनट में recover होता है, availability क्या होगी?
(UGC NET C.S. August-2016 (Paper-III))
A. 96.97%
B. 97.97%
C. 99.01%
D. 99.97%

Correct Answer: D

Explanation (EN): Availability = 100 – downtime = 100 – (10/(30×24×60)) ≈ 99.97%

Explanation (HI): Availability = 100 – downtime = 99.97%

30. System calls are usually invoked by using :
System calls को invoke करने के लिए क्या उपयोग होता है?
(UGC NET C.S. December-2015 (Paper-II))
A. A privileged instruction
B. An indirect jump
C. A software interrupt
D. Polling

Correct Answer: C

Explanation (EN): System calls are invoked using software interrupts.

Explanation (HI): System calls software interrupt के माध्यम से invoke किए जाते हैं।

31. Which of the following command is used in the communication system call of an operating system?
Communication system call में कौन-सा command उपयोग होता है?
(DSSSB TGT C.S. 07.02.2024 (Shift-II))
A. Request device, release device
B. Attach or detach remote devices
C. Allocate and free memory
D. Read, write, reposition

Correct Answer: B

Explanation (EN): Communication system calls manage IPC and network communication such as attaching/detaching remote devices.

Explanation (HI): Communication system calls IPC और network communication manage करते हैं जैसे remote devices attach/detach करना।

32. An operating system is system software that works as an interface between the computer and an user, it does the following works?
Operating system user और computer के बीच interface है, यह क्या कार्य करता है?
(Bihar STET C.S. 18.09.2020 (Shift-I))
A. Controls input & output
B. Control program execution
C. Manages use of main memory
D. All of the above

Correct Answer: D

Explanation (EN): OS controls I/O, program execution and memory management.

Explanation (HI): OS input-output, program execution और memory management सभी करता है।

33. Which of the following statements is FALSE?
निम्न में से कौन-सा कथन गलत है?
(DSSSB PGT C.S. (Male) 27.07.2018 (Shift-II))
A. A trap is a hardware-generated interrupt
B. An operating system is interrupt-driven
C. A bootstrap program is loaded at power-up or reboot
D. The program running at all times on a computer is the kernel

Correct Answer: A

Explanation (EN): Trap is a software-generated interrupt, not hardware.

Explanation (HI): Trap software-generated interrupt होता है, hardware नहीं।

34. Match the following: I Long-term scheduler II Medium-term scheduler III Short-term scheduler
Match कीजिए: Long-term, Medium-term, Short-term scheduler
(DSSSB PGT C.S. (Male) 27.07.2018 (Shift-II))
A. I-C, II-A, III-B
B. I-A, II-B, III-C
C. I-B, II-A, III-C
D. I-A, II-C, III-B

Correct Answer: C

Explanation (EN): Long-term → Job scheduling, Medium-term → Swapping, Short-term → CPU scheduling.

Explanation (HI): Long-term → Job scheduling, Medium-term → Swapping, Short-term → CPU scheduling.

35. Match the following: Disk scheduling, CPU scheduling, Page replacement, Deadlock
Match कीजिए: Disk scheduling, CPU scheduling, Page replacement, Deadlock
(DSSSB PGT C.S. M/F 11.07.2021)
A. 1-iii,2-i,3-iv,4-ii
B. 1-i,2-iv,3-ii,4-iii
C. 1-iii,2-iv,3-i,4-ii
D. 1-iv,2-i,3-ii,4-iii

Correct Answer: A

Explanation (EN): Disk→SSTF, CPU→SJF, Page→LRU, Deadlock→Banker’s Algorithm.

Explanation (HI): Disk→SSTF, CPU→SJF, Page→LRU, Deadlock→Banker’s Algorithm.

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