Operating System Basics Questions and Answers

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Q421
The S-SCAN, in disk scheduling states
  • A The arm movement is uni directional
  • B The arm movement is bdirectional
  • C The are is to be state fixed
  • D None of these
Answer: Option C
Q422
RAID-O does not support the following characterstics: A: RAID is a set of physical disk drives viewed by the operating system as a single logical drive. B: Data distributed across the physical drives of an array. C: Re-demdant disk capacity is used to store parity information, which gurantees data recoverability in case of a disk failure.
  • A A and B
  • B A only
  • C B only
  • D C only
Answer: Option D
Q423
The UNIX scheduling gives
  • A Highest preference to real time processes
  • B Highest preference to kernel mode processes
  • C Highest preference to user mode processes
  • D Highest preference to shared processes
Answer: Option A
Q424
In disk scheduling when SCAN (Look) policy is applied and when last track reached in one direction
  • A The service direction is reversed and scan proceeds in opposite direction.
  • B The Arm returns to the opposite end of the disk and scan begins again.
  • C A and B both true.
  • D None of these
Answer: Option A
Q425
In RAID (Redundant Array of independent Disks) scheme, which of the following RAID level does not include redundancy to improve performance ?
  • A RAID level 0
  • B RAID level 2
  • C RAID level 1
  • D RAID level 4
Answer: Option A
Q426
In which of the following RAID schemd, redundancy is achieved by the simple expedient of duplicating all the data ?
  • A RAID level 0
  • B RAID level 1
  • C RAID level 2
  • D RAID level 3
Answer: Option B
Q427
In shortest service time first policy, applied on disk scheduling, the disk request is  selected
  • A That requires the least movement of disk arm from its current position.
  • B That requires the maximum movement of disk arm from its current position.
  • C That is recently received.
  • D On random.
Answer: Option A
Q428
The RAID (Redundant Array of independent disks)level one requires
  • A Same disk space of the logical disk that it support
  • B Twice disk space of the logical disk that it support
  • C Thrice disk space of the logical disk that it support.
  • D Half disk space of the logical disk that it support.
Answer: Option B
Q429
Match the following in RAID scheme : A-Parallel access array, B-Independent access array, 1- All member disks participate in the execution of every I/O  request. 2- Each member disk participates separately in the execution of every I/O request. 3- Here spinles of the individual drives are synchronized so that each disk head is in the same position on each disk at any given time.
  • A A - 1, 3 and B - 2
  • B A - 1, and B -2, 3
  • C A - 2, and B- 1, 3
  • D A - 1, 2 and B - 3
Answer: Option A
Q430
The following RAID level employer parallel access technique and single redundant disk
  • A RAID level 0
  • B RAID level 1
  • C RAID level 2
  • D RAID level 3
Answer: Option D

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