IGCSE(0478)-Paper 1&2 Extra Challenge

Computers represent different types of data in binary. Tick (✓) one box to show the reason why computers use binary to represent data.

• Computers only allow 1s and 0s to be entered.

• Computers are made of switches and gates that can only be on or off.

• Binary does not need to be converted into other forms of data to be displayed.

• Both computers and humans can quickly process binary data.

The American standard code for information interchange (ASCII) denary number for the character 'N' is 78. Tick (✓) one box to identify the ASCII denary number for the character 'Q'.

• 81

• 80

• 79

• 77

Give the binary number for the ASCII denary number for 'N'.

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Explain how the word 'RED' is represented using a character set.

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Explain why recording sound with a higher sampling resolution creates a more accurate recording.

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Give one other way that the accuracy of a sound recording can be improved.

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Identify the letter of each incorrect statement. Suggest a corrected statement for each.

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State what is meant by a 3.5 GHz processor.

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Explain how the number of cores affects the performance of a CPU.

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Explain how the amount of cache affects the performance of a computer.

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