Computer Science Exam revision

What is an operating system?

• the high-level structure that supports a computer's basic CPU, such as scheduling time and controlling peripherals.

• the low-level software that supports a computer's basic functions, such as scheduling tasks and controlling peripherals.

• Computer operating systems perform basic tasks, such as recognizing output from the keyboard, sending input to the display screen,

Which are functions of the operating system?

• controls the backing store and peripheralssuch as scanners and printers

• Cant deal with errors and user instructions

• deals with the transfer of programs in and out of memory

• Doesnt allow Ram to save

what is a scheduler?

• main objective is to increase system performance in accordance with the chosen set of criteria

• main objective is to increase speed performance in accordance with the chosen set of criteria

• main objective is to increase powered performance in accordance with the chosen set of criteria

• main objective is to increase static performance in accordance with the chosen set of criteria

What is not a type of scheduler ?

• long term

• middle term

• short term

• set term

What is disk thrashing?

• thrashing occurs when a computer's RAM subsystem is in a constant state of paging, rapidly exchanging data in memory for data on disk, to the exclusion of most application-level processing.

• thrashing occurs when a computer's ROM subsystem is in a constant state of paging, rapidly exchanging data in memory for data on disk, to the exclusion of most application-level processing.

• thrashing occurs when a computer's virtual memory subsystem is in a constant state of stalling, lagging to the exclusion of most application-level processing.

• thrashing occurs when a computer's virtual memory subsystem is in a constant state of paging, rapidly exchanging data in memory for data on disk, to the exclusion of most application-level processing.

What happens because of Disk Thrashing?

• This causes the performance of the computer to lose all its memory.

• This causes the performance of the computer to degrade or collapse

• This causes the performance of the computer to upgrade its CPU

• This causes the computer to reboot

What is an interrupt in a computer?

• In system programming, an interrupt is a signal to the processor emitted by hardware or software indicating an event that needs immediate attention

• In system programming, an interrupt is a signal to the processor emitted by hardware or software indicating an event that has happened

• In system programming, an interrupt is a piece of memory emitted by hardware or software indicating an event that needs immediate attention

• In system programming, an interrupt is a signal to the RAM emitted by hardware or software indicating an event that needs immediate attention

When does Interrupts occur?

• Reset button pressed

• RAM upgrades

• ROM upgrades

• Ram is turned on

What is ISR?

• Interrupt Service RAM

• Interrupt Service Routine

• Interrupt Software Routine

• Interrupt Service Router

What does the CPU call the Interrupt in the fetch, decode, execute cycle?

• Interrupt register

• Interrupt regime

• Interrupt Ram

• Interrupt ROM