operating system

What is an operating system?

• interface between the hardware and application programs

• collection of programs that manages hardware resources

• system service provider to the application programs

• 
  all of the mentioned

To access the services of the operating system, the interface is provided by the ___________

• Library

• System calls

• Assembly instructions

• API

Where is the operating system placed in the memory?

• either low or high memory (depending on the location of interrupt vector)

• in the low memory

• in the high memory

• none of the mentioned

Gantt chart of SJF cpu scheduling is

• 
• 
• 
• 

Which one of the following is not a real time operating system?

• RTLinux

• Palm OS

• QNX

• VxWorks