Paper 1 (2018)

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

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1Ai Examiners report

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
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1AiI Examiners report

1b answer

5F 9E A0

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1B Examiners report

1c answer

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1C Examiners report

2ai answer

0011 1100

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2AI Examiners report

2aii answer

35

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2Aii Examiners report

2aiii answer

0110 1101

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2aiii Examiners report

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

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2BI Examiners report

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

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2BII Examiners report

2ci answer

C - to keep data secure

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2ci EXAMINERS REPORT

No report

2cii answer

f v e o i w
-2

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2CII Examiners report

2ciii answer

When the start/end of the alphabet is reached (1) the algorithm must roll over (1)

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2ciII Examiners report

3ai answer

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

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

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2BII Examiners report

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"

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2BII Examiners report

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

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2BII Examiners report

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

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2BII Examiners report