SET 3

Question 1

Describe advantages of proprietary

Answer 1

• Guaranteed support if software fails
• Software is well tested and bug/virus free
• software is easy to install
• Free updates are often provided to the user

Question 2

Describe disadvantages of proprietary

Answer 2

• Software requires a single or multiple licence to be bought
• user has no say over the facilities within the language
• newer version may need to be purchased after OS updates

Question 3

Give benefits of open Source software

Answer 3

• The Source Code is freely available on the Internet
• anyone can modify the software
• software is usually free
• software is being updated and improved continually
• it evolved in response to the needs of the community using the software

Question 4

Give disadvantages of open source

Answer 4

• User interface is often poorer and lessuser-friendly
• more open to abuse such as virus infection
• hidden costs such as external support
• less official support provided as support is provided by the developers/ users

Question 5

What do operating systems now have so they can work in smartphones and tablets

Answer 5

• low hardware requirements (RAM and processor speed)

- OS designed for touch input -OS uses less power as tablets are Battery powered

Question 6

Where is the operating system stored

Answer 6

• In ROM or

- a disc based OS which is loaded into RAM each time

Question 7

Describe how the os allows restrictions to be set up

Answer 7

• Different groups/profiles

- Different rights/ permissions -Set up a public folder

Question 8

How can you use software that is only available for an older OS

Answer 8

Use an emulator which imitates the older OS

Question 9

What effect does updating the os have

Answer 9

Apps are written to work on specific OS

- so updating the OS may mean the app won’t work without an update to suit the new version of OS

Question 10

State two jobs of the os

Answer 10

Memory management

file management

Question 11

Describe file management

Answer 11

• Allocates HD to programmes/ files

- Allocates access rights and permissions

Question 12

Describe memory management

Answer 12

Allocates RAM to programs/ files

Question 13

Give two advantages of a mobile friendly website rather than a separate mobile app

Answer 13

• Websites can be updated easily and updates accessible by all users
• only need to maintain 1 item rather than different apps for different platforms

Question 14

How Can companies ensure there apps can be used by everyone

Answer 14

• Create a web based app rather than a native app
• this can then be viewed on any browser regardless of the operating system
• so there is no need to install an app on an OS

Question 15

Why does an app need different translation for each type of smartphone

Answer 15

-Each process/OS Type will have a difference machine
language
-so will require a translated machine code program for each smartphone

Question 16

Give an advantage of multi platform apps

Answer 16

Give sellers competitive economic advantage as lot more potential buyers

Question 17

Give 3 reasons why the software/ app will not work on a device or is not compatible with a device

Answer 17

• The memory is full and the app/ software cannot be installed /run
• incompatible version of the operating system
• unsuitable interface

Question 18

Describe portability

Answer 18

Program/ software runs on different types of computers and/ or different operating systems

Question 19

Describe two hardware considerations for an emulator program running

Answer 19

• Ensure games instructions processed at same speed as original Hardware
• Compensate for differences in colour depth of the monitor
• compensate for differences in resolution from original to high resolution monitor
• Allow for use of modern input devices such as mouse etc

Question 20

What is the purpose of an emulator

Answer 20

• A program/ software that allows a version of an other devices operating system to run within a PC
• offers stimulation of the original features

Question 21

Reasons for using an emulator

Answer 21

• Software can be developed more easily on the PC that The Originals device
• offers stimulation of the original features
• limitations of the original device

Question 22

What is virtual reality

Answer 22

An advanced form of stimulation that can create the illusion that the user is part of the computer’s world

Question 23

Why would you use virtual reality rather than a real computer system

Answer 23

• Access virus infected data without causing damage to computer
• to allow snapshot of computer States and restore them when required

Question 24

How to calculate the range of numbers that can be stored

Answer 24

2 to the power of bits - 1

Question 25

How to calculate graphics size

Answer 25

Pixel *Pixel * DPI *DPI * No of bits for colors = Answer in bits

Question 26

How is video stored

Answer 26

As sequence of bitmap images

Question 27

How to calculate video file size

Answer 27

Pixel * Pixel * No of bits for colors(byte) * Time * Frame rate per second