ITM 207 Test Questions and Answers | 2025/26
Update | 100% Correct
Data and computers
are multimedia devices, dealing with a vast array of info categories
store, present, and help us modify
- Numbers
Texts
Video/audio
All stored as binary digits (Bits)
Data compression
Reduction in the amount of space needed to store a piece of data or the bandwidth to transmit it
Compression ratio
Size of compressed data divided by size of original data
lossless
data can be retrieved without any loss of the original information
Lossy Compression
some information is lost permanently in the process
analog data
A continuous representation of data, analogues to actual info it represents
, digital data
A discrete representation, breaking the information up into separate elements
Binary representation of data
a type of data that is represented or displayed in the binary numeral system; the only category of
data that can be directly understood and executed by a computer; numerically represented by a
combination of zeros and ones
Signed-magnitude number representation
The sign represents the ordering, and the digits represent the magnitude of the number
Let 0 through 49 represent 0 - 49
Let 50 through 99 represent -50 through -1
Tens complement representation
formula to compute the representation of a negative number
Negative(I)= 10k - I, where K is the number of digits
Ex. -3 is negative(3), so using two digits, its representation is
Negative(3)- 100-3=97 97
ASCII (American Standard Code for Information Interchange)
used 7 bits to represent each character, allowing 128 unique characters
Unicode character set
16 bits per character, supporting 65,536 unique characters
Update | 100% Correct
Data and computers
are multimedia devices, dealing with a vast array of info categories
store, present, and help us modify
- Numbers
Texts
Video/audio
All stored as binary digits (Bits)
Data compression
Reduction in the amount of space needed to store a piece of data or the bandwidth to transmit it
Compression ratio
Size of compressed data divided by size of original data
lossless
data can be retrieved without any loss of the original information
Lossy Compression
some information is lost permanently in the process
analog data
A continuous representation of data, analogues to actual info it represents
, digital data
A discrete representation, breaking the information up into separate elements
Binary representation of data
a type of data that is represented or displayed in the binary numeral system; the only category of
data that can be directly understood and executed by a computer; numerically represented by a
combination of zeros and ones
Signed-magnitude number representation
The sign represents the ordering, and the digits represent the magnitude of the number
Let 0 through 49 represent 0 - 49
Let 50 through 99 represent -50 through -1
Tens complement representation
formula to compute the representation of a negative number
Negative(I)= 10k - I, where K is the number of digits
Ex. -3 is negative(3), so using two digits, its representation is
Negative(3)- 100-3=97 97
ASCII (American Standard Code for Information Interchange)
used 7 bits to represent each character, allowing 128 unique characters
Unicode character set
16 bits per character, supporting 65,536 unique characters
