AQA Computer Science (8525) Paper 2
(2025) Exam Latest Already Graded A+
Terms in this set (281) QUESTIONS VERIFIED ANSWERS
1) What is the name of numbers with decimal
base-10?
2) What base is binary? Base-2
3) Why do computers use binary? Computers only perform the function of
turning on or off electrical charges; 1
represents electricity on whereas 0
represents electricity off.
4) Why is hexadecimal preferred over simpler to represent a byte in 2 digits
binary? rather than 8, less likely to make
mistakes, easier to remember
5) Convert 00100101 37
6) Convert 0100 to decimal 4
7) Convert 01010011 to decimal 83
8) Convert FF to binary 11111111
9) Convert FF to decimal 255
10) Convert AE from hexadecimal to 174
, decimal
11) Convert DB from hexadecimal to 11011011
binary
12) A bit is the... fundamental unit of information
13) A bit is either a... 1 or 0
14) 8 bits is equal to 1 byte
15) 1000 bytes is equal to 1 kilobyte
16) 1000 kilobytes is equal to 1 megabyte
17) 1000 megabytes is equal to 1 gigabyte
18) 1000 gigabytes is equal to 1 terabyte
19) 00101100 + 10001101 010111001
20) A binary shift to the left will do what to Multiply it by 2
the number?
21) A binary shift to the rightwill do what Divide it by 2
to the number?
22) Do a binary shift to the left on the 00010110
binary number 00001011
23) What is a character set? A collection of characters that a
computer recognises from their binary
representation
24) What does "ASCII" stand for? American Standard Code for
Information Interchange
25) How many bits is the original ASCII? 7
,26) How many values are in extended 255
ASCII?
27) What has replaced ASCII in most Unicode
computers?
28) What is the default encoding form in 16-bit
Unicode?
29) What is CODE_TO_CHAR(65)? A
30) Unicode uses the same codes as ASCII 127
up to ___
31) What is the benefit of Unicode over Unicode can represent more characters
ASCI than ASCII, allowing for more
languages and symbols to be
represented
32) Define pixel A single point in an image
33) What is pixel short for? picture element
34) How do pixels relate to images? An image is made up of pixels
35) How are images displayed? They are displayed as multiple pixels
which represent the colours in the
image
36) Define colour depth Colour depth is the number of bits used
to represent each pixel.
37) The formula for the size of a bitmap? width * height
38) How is the file size of an image width height colour depth
, calculated?
39) How does the number of pixels in an The more pixels in an image, the bigger
image affect the file size? the file size
40) Why must sound be converted by Sound is analogue and it must be
computers? converted to a digital form for storage
and processing in a computer.
41) Define sample in terms of sound a measure of amplitude at a point in
time.
42) Define sampling rate Sampling rate is the number of samples
taken in a second and is usually
measured in hertz (1 hertz = 1 sample
per second)
43) Define sample resolution Sample resolution is the number of bits
per sample
44) How do you calculate sound file size? File size (bits) = sampling rate x
sampling resolution x number of
seconds
45) Why might someone want to compress To save storage or to send/load the data
data? quickly
46) What are the two types of Lossy and lossless compression
compression?
47) What is data compression? Reducing the amount of space needed
to store a piece of data
(2025) Exam Latest Already Graded A+
Terms in this set (281) QUESTIONS VERIFIED ANSWERS
1) What is the name of numbers with decimal
base-10?
2) What base is binary? Base-2
3) Why do computers use binary? Computers only perform the function of
turning on or off electrical charges; 1
represents electricity on whereas 0
represents electricity off.
4) Why is hexadecimal preferred over simpler to represent a byte in 2 digits
binary? rather than 8, less likely to make
mistakes, easier to remember
5) Convert 00100101 37
6) Convert 0100 to decimal 4
7) Convert 01010011 to decimal 83
8) Convert FF to binary 11111111
9) Convert FF to decimal 255
10) Convert AE from hexadecimal to 174
, decimal
11) Convert DB from hexadecimal to 11011011
binary
12) A bit is the... fundamental unit of information
13) A bit is either a... 1 or 0
14) 8 bits is equal to 1 byte
15) 1000 bytes is equal to 1 kilobyte
16) 1000 kilobytes is equal to 1 megabyte
17) 1000 megabytes is equal to 1 gigabyte
18) 1000 gigabytes is equal to 1 terabyte
19) 00101100 + 10001101 010111001
20) A binary shift to the left will do what to Multiply it by 2
the number?
21) A binary shift to the rightwill do what Divide it by 2
to the number?
22) Do a binary shift to the left on the 00010110
binary number 00001011
23) What is a character set? A collection of characters that a
computer recognises from their binary
representation
24) What does "ASCII" stand for? American Standard Code for
Information Interchange
25) How many bits is the original ASCII? 7
,26) How many values are in extended 255
ASCII?
27) What has replaced ASCII in most Unicode
computers?
28) What is the default encoding form in 16-bit
Unicode?
29) What is CODE_TO_CHAR(65)? A
30) Unicode uses the same codes as ASCII 127
up to ___
31) What is the benefit of Unicode over Unicode can represent more characters
ASCI than ASCII, allowing for more
languages and symbols to be
represented
32) Define pixel A single point in an image
33) What is pixel short for? picture element
34) How do pixels relate to images? An image is made up of pixels
35) How are images displayed? They are displayed as multiple pixels
which represent the colours in the
image
36) Define colour depth Colour depth is the number of bits used
to represent each pixel.
37) The formula for the size of a bitmap? width * height
38) How is the file size of an image width height colour depth
, calculated?
39) How does the number of pixels in an The more pixels in an image, the bigger
image affect the file size? the file size
40) Why must sound be converted by Sound is analogue and it must be
computers? converted to a digital form for storage
and processing in a computer.
41) Define sample in terms of sound a measure of amplitude at a point in
time.
42) Define sampling rate Sampling rate is the number of samples
taken in a second and is usually
measured in hertz (1 hertz = 1 sample
per second)
43) Define sample resolution Sample resolution is the number of bits
per sample
44) How do you calculate sound file size? File size (bits) = sampling rate x
sampling resolution x number of
seconds
45) Why might someone want to compress To save storage or to send/load the data
data? quickly
46) What are the two types of Lossy and lossless compression
compression?
47) What is data compression? Reducing the amount of space needed
to store a piece of data
