digital images

Question 1

what are the two forms of images

Answer 1

vector and bitmap

Question 2

what is colour depth

Answer 2

how many possible colours in a pixel

Question 3

what is resolution

Answer 3

how many pixels in an inch of an image

Question 4

what is a moving image file

Answer 4

an image that includes a moving/animated graphic

Question 5

what are bitmap images commonly used for

Answer 5

photographs

Question 6

what are vector images commonly used for

Answer 6

logos

Question 7

what is lossy compression

Answer 7

It reconstructs all the original data but this means data is lost during the compression process
Once data is removed, it’s permanent and cannot be restored. It’s irreversible
This can impact the overall quality of the graphic
It does significantly reduce the overall size of the file
JPG is a common file format that uses lossy compression

Question 8

what is lossless compression

Answer 8

Data is reconstructed and doesn’t remove any data.​
Because data is retained, it’s reversible so changes can continue to be made.​
The overall quality of the graphic is retained.​
The size of these files tend to be large.​
PNG/PSD are common file formats that use lossless compression.​

Question 9

what is the most popular form of audio file

Answer 9

MP3

Question 10

what is the most popular form of image file

Answer 10

JPG

Question 11

what is the most popular form of video file

Answer 11

MP4

Question 12

what is the most popular form of moving image file

Answer 12

GIF

Question 13

what is sampling

Answer 13

When sound is recorded, samples are taken at regular intervals as you can see in the diagram on the right. The sample rate is measured in Hz (Hertz)

Question 14

what is bit depth

Answer 14

Bit depth is the number of bits available for each sample . If the bit depth increases it can increase the dynamic range of volume (this affects how loud the sound will be). This will also contribute to the quality of the sound file improving.​

Question 15

how many pixels in a nibble

Answer 15

4

Question 16

how many pixels in a byte

Answer 16

8

Question 17

how many bytes in a kilobyte

Answer 17

1000

Question 18

how do you find out sound file size

Answer 18

sound file size = sample rate x duration (s) x bit depth​

Question 19

how do you find out image file size

Answer 19

image file size = colour depth x image height (px) x image width (px)

Question 20

how do you find out text file size

Answer 20

text file size = bits per character x number of characters

Question 21

what is secondary storage

Answer 21

Secondary storage has the ability to store files even when the computer is switched off. it’s a non-volatile form of storage.

Question 22

what is a SSD

Answer 22

A solid-state drive (SSD) is a solid-state storage device that uses integrated circuit to store data persistently, typically using flash memory. Examples include Solid-State Drive, USB Flash Drive and SD Card.

Question 23

what is optical storage

Answer 23

Optical storage is any storage type in which data is written and read with a laser. Common examples of optical storage include: CD, DVD, and Blu-ray.

Question 24

what is cloud storage

Answer 24

Cloud storage allows you to save data and files in an off-site location that you access either through the public internet or a dedicated private network connection.

Question 25

what is magnetic storage

Answer 25

The most common example of magnetic storage is a Hard Drive. The hard drive contains a number of moving mechanical parts such as a spinning platter with a thin magnetic coating. A “head” moves over the platter, writing 0’s and 1’s on the platter.

Question 26

What are the tiny squares on an image referred to as?
a Squares
b Lines
c Curves
d Pixels

Answer 26

d

Question 27

Images that contain pixels are known as what type of image
a Bitmap
b Vector

Answer 27

a

Question 28

The number of bits that can be stored per pixel will determine what about the image?
a Resolution
b Metadata
c Colour depth
d Pixilatio

Answer 28

a

Question 29

A decrease in colour depth will lead to….
a More bits stored per pixel
b Less bits stored per pixel

Answer 29

b

Question 30

What term is used to refer to the number of pixels that can be stored per inch?
a Resolution
b Metadata
c Colour depth
d Sampling

Answer 30

a

Question 31

How many bits in a nibble?
a 1
b 2
c 3
d 4

Answer 31

d

Question 32

How many nibbles in a byte?
a 1
b 2
c 3
d 4

Answer 32

b

Question 33

How do you convert GB to TB?
a Add 1000
b Divide by 1000
c Multiply by 1000
d Subtract 1000

Answer 33

b

Question 34

How do you convert GB to MB?
a Add 1000
b Divide by 1000
c Multiply by 1000
d Subtract 1000

Answer 34

c

Question 35

10. Which of these is not a type of a compression method?
    a Lossy
    b Defragmentation
    c Lossless

Answer 35

b