Operating System

note!Answer: C) Unix
Unix was developed at AT&T Bell Labs in the early 1970s.

note!Answer: A) Red hat? Linux
Red Hat is a well-known vendor of Linux distributions.

note!Answer: B) ROM
The BIOS is stored in ROM (usually flash ROM) on the motherboard.

note!Answer: B) Bootstrap program
The bootstrap program (bootloader) loads the operating system into RAM at startup.

note!Answer: C) CMOS
The hardware configuration is stored in CMOS memory, and POST compares the device tests against it.

note!Answer: A) Operating system
An operating system runs directly on hardware and provides the platform for other software.

note!Answer: B) Operating system
The operating system sits between the hardware and user application programs.

note!Answer: B) Software
Software acts as a layer that converts one interface into another. Data and programs are not interface converters.

note!Answer: C) Execute more jobs in the same time period
Multiprogramming keeps several jobs in memory so the CPU executes more jobs in the same period. It does not speed up each individual job.

note!Answer: A) Operating system
The operating system is the software that controls hardware, so it shows characteristics of both.

note!Answer: B) Virtual computer
An operating system creates virtual machines/virtual computers from one physical computer, giving each user the illusion of their own machine.

note!Answer: C) Operating
The operating system is the software layer built directly on the hardware, and application software runs on top of it.

note!Answer: D) MS DOS
MS-DOS is single-tasking and cannot run multiple tasks truly at once. Windows 98, NT and XP support multitasking.

note!Answer: C) Bootstrap loader
The bootstrap loader is the special absolute loader that runs when the computer is first powered on or restarted. It loads the OS.

note!Answer: D) Any of the above
Poor response time can result from a busy process, high I/O rates or high paging rates. So any of these may cause it.

note!Answer: D) All of the above
An operating system manages memory, processes, and disks and I/O devices. All three are core OS responsibilities.

note!Answer: D) Kernel
The kernel is the part of the OS that stays resident in main memory at all times. It manages core system functions.

note!Answer: C) Both a and b
System tools are utilities that maintain the computer, such as Backup and Disk Defragmenter.

note!Answer: D) Controlling the fuel injection system of an automobile engine
Real-time operating systems are used in embedded control systems, such as an automobile's fuel injection, where responses must occur within strict time limits.

note!Answer: C) Command driven interface, single tasking operating system
MS DOS uses a command-line interface and runs one task at a time.