UGC NET Computer Science Operating System Previous Year Questions (PYQs) – Page 1 of 2

UGC NET Computer Science Operating System Previous Year Questions (PYQs) – Page 1 of 2

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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 Handlers
  • D. Kernel System Service Routines (Preemptible)
Choose the correct answer from the options given below:

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Match List I with List II

List I List II
A. Clustered Page Table III. Useful for sparse address spaces.
B. Hierarchical Page Table I. Generally considered inappropriate for 64-bit architectures.
C. Segmentation IV. Supports a user view of the system.
D. Inverted Page Table II. Has only entry for each real page (or frame) of memory.

Choose the correct answer from the options given below:


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Arrange the process of virtualization in cloud environments.

A. Hypervisor installed on physical server
B. Virtual machines created
C. Resources allocated to Virtual machines
D. Virtual machines run isolated workloads

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The write operation in I/O operation does the following -

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List I (RAID Levels) List II (Description)
A. RAID Level 2 IV. Also known as Memory style error correcting code organization
B. RAID Level 3 III. Bit interleaved parity
C. RAID Level 5 I. Block interleaved distribution parity
D. RAID Level 6 II. Also known as P+Q redundancy scheme

Choose the correct answer from the options given below:


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Consider the following table about processes, their burst time and arrival time
ProcessBurst TimeArrival Time
P190
P2300
P340
P482
P5116
Now, which process finishes second last in the Gantt chart for: non-preemptive SJF, and Round Robin (time quantum = 10)?

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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?

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Which of the following statements is correct for Pthreads?

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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 involved.

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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.
C. It may require multiple context switches when a process waits on a lock.
D. They are often employed on Uniprocessor systems.

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