Process Control Block & Scheduling Queues

September 4, 2017
Mubashir

This page contains the 18 most important Multiple Choice Questions and Answers about Process Control Block (PCB) & Scheduling Queues from subject of operating system and domain of computer science.

1) A Process Control Block(PCB) does not contain which of the following :
a) Code
b) Stack
c) Heap
d) Data
e) Program Counter
f) Process State
g) I/O status information
h) bootstrap program

2) The number of processes completed per unit time is known as __________.
a) Output
b) Throughput
c) Efficiency
d) Capacity

3) The state of a process is defined by :
a) the final activity of the process
b) the activity just executed by the process
c) the activity to next be executed by the process
d) the current activity of the process

4) Which of the following is not the state of a process ?
a) New
b) Old
c) Waiting
d) Running
e) Ready
f) Terminated

5) The Process Conrol Block is :
a) Process type variable
b) Data Structure
c) a secondary storage section
d) a Block in memory

6) The entry of all the PCBs of the current processes is in :
a) Process Register
b) Program Counter
c) Process Table
d) Process Unit

7) The degree of multi-programming is :
a) the number of processes executed per unit time
b) the number of processes in the ready queue
c) the number of processes in the I/O queue
d) the number of processes in memory

8) A single thread of control allows the process to perform :
a) only one task at a time
b) multiple tasks at a time
c) All of these

9) The objective of multi-programming is to : (choose two)
a) Have some process running at all times
b) Have multiple programs waiting in a queue ready to run
c) To minimize CPU utilization
d) To maximize CPU utilization

10) Which of the following do not belong to queues for processes ?
a) Job Queue
b) PCB queue
c) Device Queue
d) Ready Queue

11) When the process issues an I/O request :
a) It is placed in an I/O queue
b) It is placed in a waiting queue
c) It is placed in the ready queue
d) It is placed in the Job queue

12) When a process terminates : (Choose Two)
a) It is removed from all queues
b) It is removed from all, but the job queue
c) Its process control block is de-allocated
d) Its process control block is never de-allocated

13) What is a long-term scheduler ?
a) It selects which process has to be brought into the ready queue
b) It selects which process has to be executed next and allocates CPU
c) It selects which process to remove from memory by swapping
d) None of these

14) If all processes I/O bound, the ready queue will almost always be ______, and the Short term Scheduler will have a ______ to do.
a) full,little
b) full,lot
c) empty,little
d) empty,lot

15) What is a medium-term scheduler ?
a) It selects which process has to be brought into the ready queue
b) It selects which process has to be executed next and allocates CPU
c) It selects which process to remove from memory by swapping
d) None of these

16) What is a short-term scheduler ?
a) It selects which process has to be brought into the ready queue
b) It selects which process has to be executed next and allocates CPU
c) It selects which process to remove from memory by swapping
d) None of these

17) The primary distinction between the short term scheduler and the long term scheduler is :
a) The length of their queues
b) The type of processes they schedule
c) The frequency of their execution
d) None of these

18) The only state transition that is initiated by the user process itself is :
a) block
b) wakeup
c) dispatch
d) None of these

19) In a time-sharing operating system, when the time slot given to a process is completed, the process goes from the running state to the :
a) Blocked state
b) Ready state
c) Suspended state
d) Terminated state

20) In a multi-programming environment :
a) the processor executes more than one process at a time
b) the programs are developed by more than one person
c) more than one process resides in the memory
d) a single user can execute many programs at the same time

21) Suppose that a process is in “Blocked” state waiting for some I/O service. When the service is completed, it goes to the :
a) Running state
b) Ready state
c) Suspended state
d) Terminated state

22) The context of a process in the PCB of a process does not contain :
a) the value of the CPU registers
b) the process state
c) memory-management information
d) context switch time

23) Which of the following need not necessarily be saved on a context switch between processes ? (GATE CS 2000)
a) General purpose registers
b) Translation look-aside buffer
c) Program counter
d) All of these

24) Which of the following does not interrupt a running process ? (GATE CS 2001)
a) A device
b) Timer
c) Scheduler process
d) Power failure

25) Several processes access and manipulate the same data concurrently and the outcome of the execution depends on the particular order in which the access takes place, is called a(n) ____.
a) Shared Memory Segments
b) Entry Section
c) Race condition
d) Process Synchronization

26) Which of the following state transitions is not possible ?
a) blocked to running
b) ready to running
c) blocked to ready
d) running to blocked

Previous ——————— Next

Must Read – Process Control Block (PCB) & Scheduling Queues

No comments

Leave a Reply