APSCP Midterm Exam With Accurate Answers (A+)
How many bits in a byte? - ANSWER 8 bits
binary - ANSWER number system with 2 shapes
ex) "1s" and "0s"
sampling - ANSWER process of creating digital representation of analog data by
measuring analog data at regular intervals
bit - ANSWER binary digit
ex) either a "1" or a "0"
overflow error - ANSWER error from attempting to represent a number that is too large
round-off error - ANSWER error from attempting to represent number that is too
precise, value is rounded
analog data - ANSWER data with values that vary continuously or smoothly over time
ex) music, colors of painting or position of sprinter during race
digital data - ANSWER data which varies discretely via a limited set of possible values
lossless compression - ANSWER process for reducing the number of bits needed to
represent something without losing any info, process is reversible
, ex) text
lossy compression - ANSWER process for reducing the number of bits needed to
represent something in which some info is lost or thrown away, not reversible
ex) audio + video
know how to set up that "flippy-do" thingy - ANSWER 2^7 2^6 2^5 2^4 2^3 2^2 2^1 2^0
128 64 32 16 8 4 2 1
00000000
11111111
what three colors are used in color images on computers? - ANSWER RGB
red, green, blue
data - ANSWER symbols that represent people, events, things, and ideas
ex) name, a number, the colors in a photograph, or the notes in a musical composition
data representation - ANSWER the form of data stored, processed, and transmitted
digitalization - ANSWER to convert text, numbers, sound, photos, and videos to data that
can be processed by digital devices
digital file - ANSWER a named collection of data that resides on a storage medium such
as a hard disk, CD, DVD, or flash drive
how many total numbers can be represented with an 8-bit binary system? - ANSWER 256
How many bits in a byte? - ANSWER 8 bits
binary - ANSWER number system with 2 shapes
ex) "1s" and "0s"
sampling - ANSWER process of creating digital representation of analog data by
measuring analog data at regular intervals
bit - ANSWER binary digit
ex) either a "1" or a "0"
overflow error - ANSWER error from attempting to represent a number that is too large
round-off error - ANSWER error from attempting to represent number that is too
precise, value is rounded
analog data - ANSWER data with values that vary continuously or smoothly over time
ex) music, colors of painting or position of sprinter during race
digital data - ANSWER data which varies discretely via a limited set of possible values
lossless compression - ANSWER process for reducing the number of bits needed to
represent something without losing any info, process is reversible
, ex) text
lossy compression - ANSWER process for reducing the number of bits needed to
represent something in which some info is lost or thrown away, not reversible
ex) audio + video
know how to set up that "flippy-do" thingy - ANSWER 2^7 2^6 2^5 2^4 2^3 2^2 2^1 2^0
128 64 32 16 8 4 2 1
00000000
11111111
what three colors are used in color images on computers? - ANSWER RGB
red, green, blue
data - ANSWER symbols that represent people, events, things, and ideas
ex) name, a number, the colors in a photograph, or the notes in a musical composition
data representation - ANSWER the form of data stored, processed, and transmitted
digitalization - ANSWER to convert text, numbers, sound, photos, and videos to data that
can be processed by digital devices
digital file - ANSWER a named collection of data that resides on a storage medium such
as a hard disk, CD, DVD, or flash drive
how many total numbers can be represented with an 8-bit binary system? - ANSWER 256
