Chapter 1

Question 1

What is computer system layered architecture

Answer 1

1st layer hardware
2nd layer OS
3rd layer software

Question 2

Anything done by the OS is really done by kernel. True/False

Answer 2

True

Question 3

What is purpose of computer system

Answer 3

To run programs

Question 4

What is virtual memory

Answer 4

Virtual memory is a memory management capability of an OS that uses hardware and software to allow a computer to compensate for physical memory shortages by temporarily transferring data from random access memory (RAM) to disk storage. Example of lunch, if we have small plat and we want to eat more. What we will do. We will take some food in plate, eat it and then take more. In same way, virtual memory works.

Question 5

What is process

Answer 5

Program execution

Question 6

How we access system services

Answer 6

Through APIs

Question 7

What are 2 ways to use APIs

Answer 7

1. System calls

2. Library functions

Question 8

What is thread

Answer 8

In computer science, a thread of execution is the smallest sequence of programmed instructions that can be managed independently by a scheduler, which is typically a part of the operating system.

Question 9

What is an OS

Answer 9

A program that acts as an intermediary between user of a computer and the computer hardware. Provides a user simpler machine to work with.