1Ai Answer

one from:

300 x 200

200 x 300

60,000

300 x 200

200 x 300

60,000

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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

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

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2ai answer

0011 1100

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35

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0110 1101

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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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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

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

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2ci EXAMINERS REPORT

No report

2cii answer

- f v e o i w
- -2

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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

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

Employees and visitors can move around the building without disconnecting

Adding new users just means giving out the SSID password

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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"

...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 -**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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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

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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4ai answer

A - Solid state

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2BII Examiners report

4aii answer

ROM stores BIOS / bootstrap / start-up (1)

RAM stores currently executing programs and data (1)

RAM stores currently executing programs and data (1)

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4aiii answer

Data

Instructions

Instructions

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4aiv answer

B - Control unit

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