IGCSE Computer Science Paper 1 Word Scramble: 3.2 Input and Output Devices (Modules 252–261)
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Word scramble
Unscramble the letters and write each key term on the line.
1
CRBODAE ESNRCNA
An input device that shines a laser across a barcode. Black lines absorb light, white gaps reflect it, and a sensor reads the pattern to get the product number.
2
RQ DCEO NENSACR
Uses a camera to capture a 2D square grid of black and white modules and decodes it into data like a web address or text. It holds more data than a barcode and reads from any angle.
3
D1 CADBREO SV D2 RQ EDOC
A barcode stores a short number in one dimension of lines; a QR code stores much more data in two dimensions of squares and can be read by a camera from any angle.
4
CHOTU RCENES
A display that is also an input device: it detects where a finger or stylus touches it. Types are resistive, capacitive and infra-red. Used in phones, tablets, kiosks and ticket machines.
5
TIERSVISE UTHCO NSCERE
A screen with two conductive layers that touch when pressed; the change in resistance at the touch point gives its position. Works with finger, glove or stylus.
6
NERAI-RDF CTOHU ECSENR
A screen with a grid of infra-red beams across it. A touch breaks beams, and the broken x and y beams give the touch position. Works with any object.
7
D2 RSNANCE
An input device that moves a light and sensor across a flat page or photo, reading the reflected light to capture a digital image made of pixels.
8
D3 RSCNANE
An input device that uses lasers, light patterns or cameras to measure many points on an object's surface and combine them into a digital 3D model of its shape.
Answer Key
IGCSE Computer Science Paper 1 · Modules 252–261
1CRBODAE ESNRCNA → barcode scanner — An input device that shines a laser across a barcode. Black lines absorb light, white gaps reflect it, and a sensor reads the pattern to get the product number.
2RQ DCEO NENSACR → QR code scanner — Uses a camera to capture a 2D square grid of black and white modules and decodes it into data like a web address or text. It holds more data than a barcode and reads from any angle.
3D1 CADBREO SV D2 RQ EDOC → 1D barcode vs 2D QR code — A barcode stores a short number in one dimension of lines; a QR code stores much more data in two dimensions of squares and can be read by a camera from any angle.
4CHOTU RCENES → touch screen — A display that is also an input device: it detects where a finger or stylus touches it. Types are resistive, capacitive and infra-red. Used in phones, tablets, kiosks and ticket machines.
5TIERSVISE UTHCO NSCERE → resistive touch screen — A screen with two conductive layers that touch when pressed; the change in resistance at the touch point gives its position. Works with finger, glove or stylus.
6NERAI-RDF CTOHU ECSENR → infra-red touch screen — A screen with a grid of infra-red beams across it. A touch breaks beams, and the broken x and y beams give the touch position. Works with any object.
7D2 RSNANCE → 2D scanner — An input device that moves a light and sensor across a flat page or photo, reading the reflected light to capture a digital image made of pixels.
8D3 RSCNANE → 3D scanner — An input device that uses lasers, light patterns or cameras to measure many points on an object's surface and combine them into a digital 3D model of its shape.