ITM 207 MIDTERM EXAM QUESTIONS
AND ANSWERS (VERIFIED AND
UPDATED)
Data and computers - ANS 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 - ANS Reduction in the amount of space needed to store a piece of data or
the bandwidth to transmit it
Compression ratio - ANS Size of compressed data divided by size of original data
lossless - ANS data can be retrieved without any loss of the original information
Lossy Compression - ANS some information is lost permanently in the process
analog data - ANS A continuous representation of data, analogues to actual info it represents
@2026/2027 ALLRIGHTS RESERVED.
, digital data - ANS A discrete representation, breaking the information up into separate
elements
Binary representation of data - ANS 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 - ANS 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 - ANS 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) - ANS used 7 bits to represent
each character, allowing 128 unique characters
Unicode character set - ANS 16 bits per character, supporting 65,536 unique characters
Text Compression - ANS The act of reducing the size of a file.
types of text compressions - ANS Keyword encoding
Run length encoding
Huffman encoding
@2026/2027 ALLRIGHTS RESERVED.
AND ANSWERS (VERIFIED AND
UPDATED)
Data and computers - ANS 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 - ANS Reduction in the amount of space needed to store a piece of data or
the bandwidth to transmit it
Compression ratio - ANS Size of compressed data divided by size of original data
lossless - ANS data can be retrieved without any loss of the original information
Lossy Compression - ANS some information is lost permanently in the process
analog data - ANS A continuous representation of data, analogues to actual info it represents
@2026/2027 ALLRIGHTS RESERVED.
, digital data - ANS A discrete representation, breaking the information up into separate
elements
Binary representation of data - ANS 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 - ANS 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 - ANS 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) - ANS used 7 bits to represent
each character, allowing 128 unique characters
Unicode character set - ANS 16 bits per character, supporting 65,536 unique characters
Text Compression - ANS The act of reducing the size of a file.
types of text compressions - ANS Keyword encoding
Run length encoding
Huffman encoding
@2026/2027 ALLRIGHTS RESERVED.
