Computer Science - EXAM #3- Chapter 7
What do we use bits to represent?
- characters - numbers - colors - images - sounds
What are the two responses to binary when recording information?
0 or 1
Usual meaning of "digits" is the symbols _______ to _______
0 to 9
What are the 16 symbols for the hexadecimal system?
0-9; A-F
What is the bit for 1 in hexadecimal?
0001
What is the bit for 2 in hexadecimal?
0010
What is the bit for 3 in hexadecimal?
0011
What is the bit for 4 in hexadecimal?
0100
What is the bit for 5 in hexadecimal?
0101
What is the bit for 6 in hexadecimal?
0110
What is the bit for 7 in hexadecimal?
0111
What is the bit for 8 in hexadecimal?
1000
What is the bit for 9 in hexadecimal?
1001
What is the bit for A in hexadecimal?
1010
What is the bit for B in hexadecimal?
1011
What is the bit for 0 in hexadecimal?
0000
What is the first bank of ASCII called?
ASCII proper
What are basic symbols?
digits
What is the bit for C in hexadecimal?
1100
What is the bit for D in hexadecimal?
1101
What is the bit for E in hexadecimal?
1110
What is the bit for F in hexadecimal?
1111
How many bits do you use for the common characters in Unicode?
16
In terms of the USF-8 codes, other characters within the ASCII use ______ or more bytes
2
If strings are constructed using five capital letters, then what would be the combination?
26^5
How many bits do you use for all of the characters in Unicode?
32
Each hex digit is _________ bits
4
If you have two dice and you roll a 6 on each one, then what would be the combination?
6^2
In terms of a UPC, to create enough codes, each code requires ________ bits
7
Originally the ASCII consisted of how many bits? How many characters is that?
7; 128
For the eastern world, especially middle-eastern and oriental languages we are going to need more than ______ bits
8
How many bits make up a byte?
8
a byte is simply a string of ________ bits
8
What does the ASCII stand for?
American Standard Code for Information Interchange
What company created a Byte?
IBM
In terms of a UPC, is the reverse of these two codes valid?
NO
How does the NATO radio code function?
This is a radio code and the listeners can identify the letters over noise
All the ASCII codes are _________ codes
UTF-8
What is the most commonly used format for web pages?
UTF-8
What is designed to allow coding of world alphabets without breaking old software?
UTF-8 codes
What type of coding allows large numbers of characters to be coded?
UTF-8 codes
What defines a vast number of codes for pretty much the entire world?
Unicode
What is the ASCII for US English?
Unicode
What does UPC stand for?
Universal Product Code
Is the ASCII older than the Internet?
YES
How can the use of digits be misleading?
a phone number is not a quantity
Divide disks into __________
areas
Why is it spelled byte and not bite?
because a single typo cannot change byte to bit
Why don't computers use the decimal system to record information?
because it is difficult and expensive and there are more than 2 symbols
Decimal digits are coded in ___________
binary
In order to create larger symbols we must group __________ together
bits
How are bits recorded in terms of a bar code?
bits are recorded by the presence or absence of a bar
PC memory is divided into __________
bytes
What is the ASCII drawback?
cannot fit 16 bits that was designed to hold 8 bits
What does the second bank for Unicode add?
characters for other European languages
In terms of the USF-8 codes, characters from 7-bit ASCII are represented by the ASCII ___________ using _____ byte
code; 1
Alphabetic order is a __________ sequence
collating
What is an ordering for a set of symbols used to sort them, for example, alphabetical ordering?
collating sequence
What does encoding with redundancy prevent?
detects or avoids errors
What is information represented using digits?
digital information
What kind of codes can help the reader correct damaged data if the damage is not to severe?
error-correcting code
What is a more compact representation for string of bits?
hexadecimal
Give an example of a string or words?
if you have p symbols, there are p^n strings of length n
Describe the second bank of ASCII proper?
it is not really reliable
UTF-8 codes vary in __________
length
What are the two kinds of codes for a UPC?
manufacturer and a product code
What are error correcting codes used with?
memories, storage devices, and space communications
Digits are consisted of _________
numbers
Give some examples of presence or absence.
on or off charged or discharged magnetized or not
symbols made of digits are easily __________ for searching
ordered
What appends an extra bit to your data so that a total count of ones is always an even number?
parity
What refers to whether a number is even or odd?
parity
To record or transmit digital information, symbols must be recorded using some __________ phenomenon
physical
Give some examples of physical phenomenon.
puffs of smoke flashes of light
To name a large number of things, you need to make a group of digits, called ________ or __________
strings or words
We can string ________ to make more symbols to represent more things
symbols
How do computers record numbers?
they use two symbols of physical phenomenon - presence or absence
Computer engineers find it easiest to use physical phenomenon classified in ________ states: What are those two states?
two; present and absent
