Unit 2

Question 1

Why do designers need to consider the size of the resolution for the images they are using?

Answer 1

Quality of Images (pixels or megapixels) – Quality will be needed to be high in a photography. The cost of producting images (usally) increases as the quality of the picture (the megapixel). The brightness and sharpness increases as there is more mexapixels. The storage is another issue with the pictures. A cookery magazine/website wouldn’t need a high quality image. This means that the lower quality camera would the better suited as less storage is needed.

Question 2

What is the effect of compression on image data?

Answer 2

Compression is used to reduce the size of a file.

Compression can be lossless or lossy.

Question 3

What are the types of compressed image files? Explain them.

Answer 3

PNG is a lossless compression type. It is often used where the graphic might be changed by another person,
JPEG is often used for digital camera images because it has a fairly small file size for the quality that it displays. JPEG is a lossy format,
GIF compresses images to a maximum 8-bit colour depth, making it unsuitable for high-quality photographs. GIF is often used where transparency is needed on the graphic. GIF can also be used to store simple animated images.

Question 4

What is lossy?

Answer 4

Lossy compression permanently removes the original quality.

Question 5

What is lossiness?

Answer 5

Lossless compression means that as the file size is compressed, the picture quality remains the same - it does not get worse and can be returned to origional quality.

Question 6

What are Multi-Functional Devices?

Answer 6

Multi-Functional Devices: Devices that perform multiple function devices.

Question 7

What are Mobile Devices?

Answer 7

Mobile Devices: A device that can perform several things such as a smartphone. It has camera and can use apps on it.

Question 8

What are servers?

Answer 8

Servers: Computer devices that run to a network that work for other devices.

Question 9

What is RJ45?

Answer 9

RJ45: This is the standard for network ethernet cable plugs and the sockets or ports that the cable uses to connect network devices together to the internet.

Question 10

What is input? Give the definition and 3 examples.

Answer 10

Input means what is put in.

Examples are: Keyboard, Microphone and Camera .

Question 11

What is Output? Give the definition and 3 examples.

Answer 11

Output means the result.

Examples are: Screens, Projectors and Motors.

Question 12

What is storage? Give the definition and 3 examples.

Answer 12

Storage means memory.

Examples are: USB Flash Drives, Magnetic Tape Drive and Hard Drives

Question 13

What are Modular smartphones?

Answer 13

A smartphone that contains different components and features that can be changed by the user to change the functionality of the device (e.g. LG G5, Project Ara).

Question 14

What is wearable computers?

Answer 14

portable technology systems worn by the user.

Question 15

What are Single board computers?

Answer 15

This is a small, inexpensive computers designed for development projects and use in education.

Question 16

What is software?

Answer 16

Software is the set of instructions and associated data that direct the computer to do a task. Without it, computers can’t function (work).

Question 17

What are System software?

Answer 17

This helps the computer to carry out its basic operating tasks.

Question 18

What is Application software?

Answer 18

This helps the user carry out a variety of tasks.

Question 19

What is an operating system?

Answer 19

Operating System: This is collection of computer programs that control the interaction of the user and the computer hardware.
It Controls basic input and output, allocates system resources, manages storage space, maintains security, and detects equipment failure.

Question 20

What is Real- Time Operating Systems?

Answer 20

The are used in every interactive computer system. They have the ability to process data in(current) real time.

Question 21

What are Single- user Operating Systems?

Answer 21

They are design for computers used by a single person at a time. These are usually multi-tasking so that the user can run several software applications at the same time. However, some are single task systems which can run only one application at a time.

Question 22

What are Multi-user Operating Systems?

Answer 22

Designed for large computers used by many people at the same time for jobs requiring a lot of processing power, such as weather forecasting. It enables several