Files and Data

Question 1

what is a “property” of a file

Answer 1

the information about the file itself for example the metadata

Question 2

name 5 pieces of metadata for images

Answer 2

file format
dimensions
resolution
colour depth
locations

Question 3

name 3 pieces of metadata for text files

Answer 3

file format
pages
word count
line count
character count

Question 4

name 3 pieces of metadata for audio files

Answer 4

file type
duration
bit rate
sample rate
channels

Question 5

name 4 pieces of metadata for video files

Answer 5

file type
duration
frame rate
bit rate
sample rate
changels

Question 6

what are 3 file types of vidoes

Answer 6

MP4
MOV
AVI

Question 7

what are 3 file types of audios

Answer 7

MP3
FLAC
WAV

Question 8

what is compression

Answer 8

a way of reducing file size

Question 9

what are the 2 types of compression

Answer 9

lossy and lossless

Question 10

how does lossy compression work

Answer 10

will reduce filesize by permanently removing data

Question 11

what is the benefit of lossy compression

Answer 11

significantly lowers filesize

Question 12

what is the con of lossy compression

Answer 12

irreversible

Question 13

what is lossless compression

Answer 13

uses an algorithm to lower the filesize by grouping data

Question 14

what is a pro and a con for lossless compression

Answer 14

doesn’t reduce file size as much
reversible

Question 15

what are the 4 types of data errors

Answer 15

general input error
transcription error
processing error
transmission error

Question 16

what is a general input error

Answer 16

occurs when a customer incorrectly enters data into a form

Question 17

what is a transcription error

Answer 17

when a data entry clerk makes a mistake such as misspelling

Question 18

what is a processing error

Answer 18

a mistake in the program which creates a logic error

Question 19

what is a transmission error

Answer 19

occurs during when data is being transferred

Question 20

what is data validation

Answer 20

checking the data entered is accurate

Question 21

what are 2 traditional data verification methods

Answer 21

manual proofreading
double entry

Question 22

what is manual proofreading and how does it work

Answer 22

when somebody manually checks that the data has been entered correctly

Question 23

what is double entry and how does it work

Answer 23

getting the user to enter in data twice to make sure that there are no errors

Question 24

what are 4 new methods of data verification

Answer 24

enter password twice
CAPTCHA
2FA
memorable information

Question 25

what is CAPTCHA and how does it work

Answer 25

this uses an image that the user must identify, it helps identify whether the data is being entered by a human or a robot

Question 26

what is 2FA

Answer 26

two-factor authentication is when 2 devices are used to check whether it is the real user logging in, for example, a text can be sent to your phone with a code that needs to be entered into your computer

Question 27

what are the 6 data verification checks

Answer 27

format
range
presence
type
lookup table
length check

Question 28

what is format check, and an example

Answer 28

checks that data has been entered in the correct format form example LLN NLL

Question 29

what is a range check

Answer 29

checking that the data entered is between a certain range

Question 30

what is a presence check

Answer 30

checking that a data field has not been left empty

Question 31

what is a type check

Answer 31

checks that data entered is of a certain type

Question 32

what is a lookup table

Answer 32

checks that data is in a table of acceptable values