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EDEXCEL GCSE COMPUTING

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

EDEXCEL GCSE Paper 1 (2018) material mark scheme can be downloaded here 

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1Ai Answer (Ao2)
one from:
300 x 200
200 x 300
​60,000

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1Ai ​Examiners report
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1aii answer (Ao1)
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
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1AiI ​Examiners report
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1b answer (Ao2)
5F 9E A0 

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1B ​Examiners report
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1c answer (Ao1)
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1C ​Examiners report
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2ai answer (Ao2)
0011 1100

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2AI ​Examiners report
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2aii answer (Ao2)
35

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2Aii ​Examiners report
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2aiii answer
0110 1101

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2aiii ​Examiners report
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2Bi answer (Ao2)
A sensor (1) could be used with a microprocessor to determine light levels (1) to activate a switch / turn on/off the headlights

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2BI ​Examiners report
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2bii answer (Ao2)
​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

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2BII ​Examiners report
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2ci answer (Ao1)
 C - to keep data secure

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2ci ​EXAMINERS REPORT
No report
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2cii answer (Ao1)
  • f v e o i w 
  • -2

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2CII ​Examiners report
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2ciii answer (Ao1)
When the start/end of the alphabet is reached (1) the algorithm must roll over (1)

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2ciII ​Examiners report
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3ai answer (Ao1)
Share peripherals/devices (e.g. printers, scanners) (1)
Communicate (e.g.  email, instant messaging)
Share data
Deploy/Update applications
​
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3aI ​Examiners report
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3aii answer (Ao1)
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
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2BII ​Examiners report
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3bi answer (Ao1)
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"

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2BII ​Examiners report
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3bii answer (Ao1)
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

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2BII ​Examiners report
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3c answer (Ao2)
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
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54 x 1000 x 1000
1 mark = number of bits in numerator
​1 mark = number of bits per second in denominator

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2BII ​Examiners report
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4ai answer (Ao1)

A - Solid state
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2BII ​Examiners report
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4aii answer (Ao1)
ROM stores BIOS / bootstrap / start-up (1)
RAM stores currently executing programs and data (1)


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2BII ​Examiners report
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4aiii answer (Ao1)
Data
Instructions

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2BII ​Examiners report
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4aiv answer (Ao1)
B - Control unit

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