EDEXCEL GCSE Paper 1 (2018) exam paper can be downloaded here

EDEXCEL GCSE Paper 1 (2018) material mark scheme can be downloaded here 
1Ai Answer
one from:
300 x 200
200 x 300
​60,000

More help here -
1aii answer
All colours are combinations of RGB
Each of R, G, B is 8 bits / 8 bits are allocated to the three primary colours red, green, blue
3 colours x 8 bits each = 24 bits
2 to the power of 24 colours can be represented
24 bits are used to represent the colour of each pixel
More help here -
1b answer
5F 9E A0 

More help here -
1c answer


More help here -

2ai answer
0011 1100

More help here - 
2aii answer
35

More help here - 
2aiii answer
0110 1101

​More help here -
2Bi answer
A sensor (1) could be used with a microprocessor to determine light levels (1) to activate a switch / turn on/off the headlights

More help here -
2bii answer
​5 bits are needed

And one from:
because 4 bits / 2 to the power of 4 only represents 16 values
because 5 bits / 2 to the power of 5 represent up to 32 values

More help here -
2ci answer
 C - to keep data secure

More help here - 
2cii answer
  • f v e o i w 
  • -2

More help here - 
2ciii answer
When the start/end of the alphabet is reached (1) the algorithm must roll over (1)

More help here -
3ai answer
Share peripherals/devices (e.g. printers, scanners) (1)
Communicate (e.g.  email, instant messaging)
Share data
Deploy/Update applications
​
More help here -

3aii answer
May not have space for cables to be installed
Employees and visitors can move around the building without disconnecting 
Adding new users just means giving out the SSID password
​
More help here - 
3bi answer
Most people do not notice (1)
...because
People have a limited hearing range
OR
Sounds (frequencies/amplitudes) can be masked by other sounds
OR
People's brains will "fill in the blanks"

More help here -
3bii answer
May increase the file size / the file may not be compressed very much / at all (1) if characters are distributed randomly/not repeated/runs of similar characters are found

More help here -
3c answer
Total number of bits to transfer

1 mark for 81 x 1024 o the power of 2
1 mark for x 8

Speed in bits per second:
​1 mark for 54 x 1000 to the power of 2

Time = number of bits / bits per second:
81 x 1024 x 1024 x 8
-------------------------
54 x 1000 x 1000
1 mark = number of bits in numerator
​1 mark = number of bits per second in denominator

More help here -
4ai answer

A - Solid state
More help here -
4aii answer
ROM stores BIOS / bootstrap / start-up (1)
RAM stores currently executing programs and data (1)


More help here -
4aiii answer
Data
Instructions

More help here -
4aiv answer
B - Control unit

More help here -
4bi answer
Any two from:
  • All processes are held in a queue
  • Processes are prioritised
  • (and) processes are switched
  • On each clock cycle

More help here -
4bii answer
C - Converting files

More help here -
5a answer
An explanation that makes reference to one of these types of access:
  • Read only
  • No access
And includes a linked reason:
  • The student cannot see any sensitive/irrelevant information
  • The student does not accidentally change/delete the data
  • The student cannot share the data (outside the organisation)


More help here -
5b answer
D - Unpatched

More help here -
5c answer
  • Disposal of digital devices in a landfill (1) could cause dangerous chemicals / toxins to leak (1) into drinking water (1)
  • Reclaiming precious metals (1) exposes workers to more dangerous chemicals/materials (1) by contact during handling
  • Incineration of digital devices (1) causes chemicals/toxins to be released into the air (1), which could then be inhaled (1)
  • If batteries are not removed / thrown in a bin (1) they can catch fire (1) creating a risk of burns (1)

More help here -
5di answer
Networks are put under deliberate attack (1) in order to identify any weaknesses/vulnerabilities (1) so that they can be fixed (1)

More help here -

5dii answer
Any town from:
Identify:
  1. Bad programming practices
  2. inefficient code
  3. logic errors
  4. programming language-specific vulnerabilities 
  5. security vulnerabilities

More help here -
6a answer
Any four from:
  1. A single executable file is produced
  2. The executable program is portable between machines
  3. The program source code is not available
  4. Code can be optimised/made more efficient
  5. Entire source code file is converted at once
  6. No special environment is needed to execute the code
  7. It creates object/machine code
  8. Error report s provided at the end of the compilation

More help here -
6B answer
A description to include five from:
  1. Reads the data/packet to find the recipient's address
  2. Has physical connections to >=2 different networks
  3. Holds a routing table
  4. Stores information about (IP) addresses
  5. Keeps packets inside a network by not forwarding them
  6. Forwards data/directs/forwards/sends packets [Not directs data as in question]
  7. Chooses the mot efficient path to the next node

More help here -
6c answer
Best case: the item is the middle / median of the list
Worst case: The item is not in the list / located at the point at which the final division could be made

More help here -
6d answer
  1. All of the items appear to be stored on one single device
  2. The virtual device appears to be storage on the local machine
  3. Software sits between the physical devices and the user
  4. The items stored on the cloud could be scattered over several different physical hard discs/servers
  5. The items stored on the cloud could be resident in different locations
  6. Files need to be accessed via a network/internet
  7. Procedures (e.g. backup) happen without the end user being aware or involved

More help here -