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'.

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

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

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

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

State what is meant by a 3.5 GHz processor.

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

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