System Software and Operating System – Previous Year Questions
336 questions from past UGC NET Paper 2 – Computer Science papers, each with the correct answer. Open any question for its explanation.
- Which of the following routing technique(s) is/are used in distributed systems? (A) Fixed Routing (B) Virtual Routing (C) Dynamic Routing
- Match the following WINDOWS system calls with the equivalent UNIX system calls, with reference to process control and file manipulation: Windows: (A) CreateProcess() (B) WaitForSingleObject() (C) CreateFile() (D) CloseH…
- Which statement is not correct about the 'init' process in UNIX?
- Which UNIX command correctly changes the case of only the first three lines of the file "shortlist" from lower case to upper case?
- Match the following basic vi editor commands in UNIX with their functions. List I (Command): (a) dd (b) yy (c) p (d) u List II (Function): (i) Copies (yanks) the current line into the buffer (ii) Undoes the last change…
- Consider the following statements about linker software: (I) A linker combines multiple object (relocatable) modules into a single load module. (II) A linker replaces absolute references in a program with symbolic refer…
- A distributed operating system typically consists of:
- Which of the following statements about UNIX signals is NOT correct?
- A null remote procedure call (RPC) (carrying 0 data bytes) takes 1.0 msec, with an additional 1.5 msec for every 1K of data carried. How long does it take to read 32K from a file server, issued as 32 separate 1K RPCs?
- What is the function of the following UNIX command? wc -l a > b &
- Which of the following statements about the cron daemon in a UNIX operating system is NOT correct?
- In UNIX, which single command creates the directory "PIS" together with its two subdirectories "progs" and "data" (i.e. PIS/progs and PIS/data), all newly created in one invocation?
- Match List - I with List - II. List - I List - II A. Latency I. number of tasks completed in a given time period B. Delay II. causes the current activity to be deferred C. Throughput III. time elapsed before next activi…
- In Rate Monotonic scheduling, if a task has a period of 80 ms and an execution time of 55 ms, then its processor utilization and task rate will be
- Match the LIST-I with LIST-II. LIST-I LIST-II A. Disk Scheduling I. Round Robin B. Batch Processing II. SCAN C. Time Sharing III. LIFO D. Interrupt Processing IV. FIFO Choose the correct answer from the options given be…
- For the reference string: (given that number of frames is 3) 7 0 1 2 0 3 0 4 2 3 0 3 2 1 2 0 1 7 0 1 for the optimal page replacement algorithm, which of the following will represent the hit ratio?
- Which of the following is not an interprocessor communication mechanism in UNIX?
- In disk scheduling example, suppose the disk tracks are numbered from 0 to 49. Head is presently positioned at track 15 and requests for tracks 4, 40, 11, 35, 7 and 14 have arrived (in that order). It takes 1 ms to trav…
- Following is not the feature/characteristic of Linked-List allocation of Files in a File system:
- Match List - I with List - II. List - I List - II A. Macros I. Converts high level code to object (Machine) code B. Assembler II. Used for code Expansion C. Loader III. Used to translate assembly language code to object…
- Once the process is allocated CPU and executing, which of the following events could NOT occur? A. The process could issue an I/O request and then be placed in the Ready Queue B. The process could create new subprocesse…
- What shall be the average waiting time per process if we know that 10 processes (on average) arrive every second and there are normally 20 processes in the queue?
- Which of the following shows the correct hierarchy of a layered file system in an operating system? A. Logical File System B. File Organization Module C. Basic File System D. I/O Control E. Application Programs Choose t…
- Consider the following interrupt protection levels in Linux, and arrange them in the increasing order of their priorities. A. User-Mode Programs (Preemptible) B. Bottom Half Interrupt Handlers C. Top Half Interrupt Hand…
- Match List I with List IIList I List II A. Clustered Page Table I. Generally considered inappropriate for 64 bit architectures. B. Hierarchical Page Table II. Has only one entry for each real page (or frame) of memory.…
- Identify the correct statement(s) from the following with respect to Spinlock Semaphores A. The name refers to busy waiting semaphores. B. They are not useful when the locks are to be held for a short duration of time.…
- What is the total swap time (swap in + swap out) in a system for a 15 MB process with a transfer rate of 30 MBps? Given that there is an average latency of 12 ms, however no head seeks are involved.
- Match List I with List IIList I List II A. RAID Level 2 I. Block interleaved distributed parity B. RAID Level 3 II. Also known as P+Q redundancy scheme C. RAID Level 5 III. Bit interleaved parity D. RAID Level 6 IV. Als…
- Consider the following table about processes, their burst time and arrival time. Which process shall finish second last as per the respective Gantt charts for non-preemptive SJF and Round Robin (time quantum = 10) sched…
- Which of the following statements is correct for Pthreads?