Computer Science Exam 1
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43 Terms
1
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What base is decimal/denary?
10
2
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What base is binary?
2
3
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What base is hexadecimal?
16
4
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What is binary?
a system where numbers and values are represented as 0 or 1
5
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Why do computers use binary?
Computers use electrical signals that are either on or off
6
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What are transistors?
The switches in a processor that turn it on or off
7
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How many columns on a nibble table?
4
8
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How many columns on a byte table?
8
9
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What does a small b represent?
bit
10
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What does a big B represent?
byte
11
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How many nibbles in one byte?
2
12
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What range can represented in 8 bits?
0 to 255
13
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How many bits in a nibble?
4
14
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Why is hexadecimal notation used?
Shorter and easier for humans to understand
15
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What characters are used to represent hexadecimal?
0-9 A-F
16
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What is a bit?
The fundamental unit of information
17
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What is an issue with using logical shifts?
It decreased precision as it may take of necessary binary
18
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In ASCII how much storage space is needed for a single letter of the alphabet?
7 bits
19
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How many bits does extended ASCII use?
8
20
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How does the computer recognise which letter is pressed on a keyboard?
It converts it into a number when the key is pressed
21
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Advantage of ASCII over Unicode
Takes up less storage
22
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Advantage of Unicode over ASCII
Has more characters
23
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How many bits is Unicode?
16
24
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What is ASCII?
American Standard Code for Information Interchange
25
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Unicode uses the same codes as ASCII up to ...
127
26
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What is a character set?
A collection of characters that a computer recognises from their binary representation
27
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Logic error
Error results in an unexpected outcome
28
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Syntax error
Error in spelling, punctuation and grammar
29
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Runtime error
Error that occurs when a program is asked to do something it cannot, resulting in a crash
30
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\n
escape sequence for a new line
31
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\t
escape sequence for a tab
32
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Changing from one data type to another while the program is running
Casting
33
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Power of
**
34
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MOD
% remainder of division
35
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DIV
// whole number without rounding
36
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What is a variable?
stores data in the RAM
37
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Overflow error
when the total from adding binary cannot be stored in the storage available
38
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Equal to
==
39
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Not equal to
!=
40
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Greater than
>
41
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Greater than or equal to
>=
42
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Less than
<
43
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Less than or equal to
Note 
Flashcards (30)