Question 1

It is possible to minimize response time by running only interactive jobs and letting batch jobs wait until the interactive load ceases.

Accepted Answer

By prioritizing interactive jobs over batch jobs, response time can be minimized as users will have quicker access to the system for their interactive tasks. Batch jobs can be delayed until the interactive load is low, allowing for efficient use of system resources.

Question 2

Most computer programs alternate between CPU cycles and I/O cycles.

Accepted Answer

This is true because computer programs often have to wait for external inputs or outputs, which involves input/output operations (I/O cycles) that are separate from the main processing of the program (CPU cycles). Programs constantly switch between these cycles to complete their tasks.

Question 3

The shortest remaining time (SRT)algorithm is often used in interactive systems.

Accepted Answer

False

Question 4

A processor is also known as a CPU.

Accepted Answer

True. CPU stands for Central Processing Unit, which is commonly referred to as a processor.

Question 5

A program is an active entity that requires a set of resources,including a processor and special registers,to perform its function.

Accepted Answer

A program is a passive entity consisting of instructions; it becomes a process (an active entity) when loaded into memory and executed by a processor.

Question 6

A job's state moves from HOLD to WAITING when it's ready to run but is waiting for the CPU.

Accepted Answer

A job moves from HOLD to READY state when it's ready to run, not WAITING. WAITING typically refers to a job that is ready to run but waiting for some other resources (not the CPU) or for an event to occur.

Question 7

If one job monopolizes the system,the extent of its overall effect on system performance depends on the scheduling policy and whether the job is CPU-bound or I/O-bound.

Accepted Answer

The scheduling policy and whether the job is CPU-bound or I/O-bound can greatly affect the overall performance of a system when one job monopolizes the system.

Question 8

First-come,first-served (FCFS)is a preemptive scheduling algorithm that handles jobs according to their arrival time.

Accepted Answer

First-come, first-served (FCFS) is a non-preemptive scheduling algorithm, meaning it processes jobs in the order they arrive without interrupting them once they have started.

Question 9

Context switching is required by all preemptive algorithms.

Accepted Answer

Preemptive algorithms interrupt the execution of a process and switch to another process. This switching requires context switching, which involves saving the current state of the process and restoring the saved state of the new process. Therefore, context switching is required by all preemptive algorithms.

Question 10

A single processor can be shared by several jobs,or several processes,but only if the operating system has a scheduling policy,as well as a scheduling algorithm,to determine when to stop working on one job and proceed to another.

Accepted Answer

This statement is true as multiple processes can be scheduled to use a single processor using various scheduling algorithms implemented by the operating system.

Question 11

Web browsers use multithreading routinely.For example,one thread can retrieve images while another sends and retrieves e-mail.

Accepted Answer

Web browsers are designed to utilize multithreading to improve their performance. For example, one thread can handle user input while another sends requests to a server and a third one can render images or videos. This allows for faster and more efficient browsing experience.

Question 12

Dual core or quad core multi-core chips are larger than a single-processor chip but produce less current leakage and heat.

Accepted Answer

Dual core or quad core multi-core chips are indeed larger than a single-processor chip, but they do not inherently produce less current leakage and heat. In fact, increasing the number of cores can potentially lead to higher power consumption and heat generation, although advancements in technology and design techniques aim to mitigate these effects.

Question 13

When using a multiple-level queue strategy,aging is used to ensure that jobs in lower-level queues will eventually complete their execution.

Accepted Answer

Aging is a technique used to prevent starvation in lower-priority processes by gradually increasing their priority levels over time. This ensures that jobs in lower-level queues will eventually receive the necessary resources and complete their execution.

Question 14

Shortest job next (SJN)is a nonpreemptive scheduling algorithm (also known as shortest job first,or SJF)that handles jobs based on the length of their CPU cycle time.

Accepted Answer

SJN is a nonpreemptive scheduling algorithm that schedules the shortest CPU cycle time job first.

Question 15

In Round Robin scheduling,if processing isn't finished when time expires,the job is preempted and put at the end of the READY queue and its information is saved in its Process Control Block.

Accepted Answer

This is the basic concept of Round Robin Scheduling, where each process is given a fixed time slice (time quantum) and if the process execution isn't completed within that time, it is preempted and placed back at the end of the READY queue, and its information is stored in the Process Control Block.

Question 16

As a process moves through the system,its status changes.Possible process statuses include FINISHED,HOLD,READY,RUNNING,and WAITING.

Accepted Answer

This statement is true. As a process moves through the system, its status changes based on its current state in the system. The possible process statuses include FINISHED, HOLD, READY, RUNNING, and WAITING.

Question 17

CPU-bound jobs (such as printing a series of documents)have many brief CPU cycles and long I/O cycles.

Accepted Answer

CPU-bound jobs are characterized by tasks that primarily require significant CPU time for processing rather than waiting on I/O operations. Printing a series of documents would involve more I/O cycles (waiting for the printer) than CPU cycles.

Question 18

The Processor Manager is a composite of at least two submanagers: one in charge of job scheduling and the other in charge of program scheduling.

Accepted Answer

The Processor Manager is typically composed of two submanagers: one in charge of process scheduling and the other in charge of job scheduling. There isn't a submanager specifically for "program scheduling" as described; the correct term is process scheduling.

Question 19

When using priority scheduling,priorities are assigned to jobs by the owner of the job (the user).

Accepted Answer

In priority scheduling, priorities can be assigned either by the system or by the users, depending on the specific implementation of the scheduling system.

Question 20

The control program that handles the interruption sequence of events is called the event scheduler.

Accepted Answer

The control program that handles the interruption sequence of events is called the interrupt handler or interrupt service routine (ISR), not the event scheduler. The event scheduler is typically involved in managing the execution of software tasks based on timing or event priorities.

Quiz 4: Processor Management