IGCSE Computer Science Paper 1 Word Scramble: 3.1 Computer Architecture and 3.2 Input and Output Devices (Modules 240–251)
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Word scramble
Unscramble the letters and write each key term on the line.
1
HAMIECN ODCE
The binary (0s and 1s) form of instructions that the CPU can run directly. Each instruction has an opcode and an operand. Programs must be translated into it to run.
2
MDEEEDBD TSESYM
A computer system built into a larger device to perform one dedicated function, usually running a fixed program. Examples: a washing machine controller or a microwave timer.
3
DXETT-EFHOCE-CEUEDCE
A full-mark CPU answer uses exact names for registers, buses and units, and gives the fetch, decode and execute steps in order, e.g. PC to MAR, then MDR, then CIR.
4
BAKDREOY
An input device where pressing a key completes a circuit. The controller identifies the key and sends its character code to the computer, so text and commands can be entered.
5
ATCLPIO USEOM
An input device with an LED or laser under it that lights the surface while a sensor takes rapid images to track movement and move the pointer. It has no ball.
6
ONOMRCHEPI
An input device that turns sound waves into an analogue electrical signal, which an ADC converts to digital data so the computer can record or process voice.
7
IIAGLDT MCAREA
Input device: a lens focuses light onto an image sensor of light-sensitive cells; each cell becomes a pixel of digital data, stored as an image file. More pixels give more detail.
Answer Key
IGCSE Computer Science Paper 1 · Modules 240–251
1HAMIECN ODCE → machine code — The binary (0s and 1s) form of instructions that the CPU can run directly. Each instruction has an opcode and an operand. Programs must be translated into it to run.
2MDEEEDBD TSESYM → embedded system — A computer system built into a larger device to perform one dedicated function, usually running a fixed program. Examples: a washing machine controller or a microwave timer.
3DXETT-EFHOCE-CEUEDCE → fetch-decode-execute — A full-mark CPU answer uses exact names for registers, buses and units, and gives the fetch, decode and execute steps in order, e.g. PC to MAR, then MDR, then CIR.
4BAKDREOY → keyboard — An input device where pressing a key completes a circuit. The controller identifies the key and sends its character code to the computer, so text and commands can be entered.
5ATCLPIO USEOM → optical mouse — An input device with an LED or laser under it that lights the surface while a sensor takes rapid images to track movement and move the pointer. It has no ball.
6ONOMRCHEPI → microphone — An input device that turns sound waves into an analogue electrical signal, which an ADC converts to digital data so the computer can record or process voice.
7IIAGLDT MCAREA → digital camera — Input device: a lens focuses light onto an image sensor of light-sensitive cells; each cell becomes a pixel of digital data, stored as an image file. More pixels give more detail.