TRB - Computer Instructor - Computer Science - Operating Systems

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Question - 1

In time-sharing operating system, when time slot given to a process is completed, the process goes from the running state to the

  • A blocked state
  • B dead state
  • C suspended state
  • D terminated state

Question - 2

Supervisor call

  • A is a call made by the supervisor of the system
  • B is a call with a control functions
  • C are pixilated calls that are used to perform resource management functions which controlled by the operating system
  • D in a call made by someone working in root directory

Question - 3

Some computer system supports dual mode operations, the user mode and the supervisor mode. These refers to the modes

  • A by which user program handle their data
  • B by which operating system executes its program
  • C in which the processor and the associated hardware operate
  • D of memory access

Question - 4

Pre-emptive scheduling in the strategy of temporily suspending a running process

  • A before the CPU time slice expires
  • B to allow starving process to run
  • C when it request I/O
  • D None of the above

Question - 5

In Round-Robin CPU scheduling, as the time quantum is increased, the average turn around time

  • A increases
  • B decreases
  • C remains constant
  • D varies irregularly

Question - 6

Round-Robin scheduling is essentially the primitive version of

  • A FIFO
  • B shortest job first
  • C shortest remaining time first
  • D longest time first

Question - 7

FIFO scheduling is

  • A pre-emptive scheduling
  • B Non-pre-emptive scheduling
  • C deadline scheduling
  • D fare-share scheduling

Question - 8

In real-time operating system, which of the following is the most suitable scheduling algorithm?

  • A Round-Robin
  • B FCFS
  • C Pre-emptive
  • D Random

Question - 9

Which of the following statements is true?
1. Shortest remaining time first scheduling may cause starvation
2. Pre-emptive scheduling may cause starvation
3. Round-Robin is better than FCFS in terms of response time

  • A 1 only
  • B 1 and 3
  • C 2 and 3
  • D 1, 2 and 3

Question - 10

At a particular time, the value of a counting semaphore is 10. It will become 7 after

  • A 3 V operations
  • B 3 P operations
  • C 5 V operations and 2 P operations
  • D 13 P operation and 10 V operation
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