3. Hardware - Input & Output Devices: Computer Science CIE IGCSE

What is the most common type of scanner?

• 2D

• 1D

• 3D

• 4D

What are 2D scanners used to scan?

• Paper documents

• Books

• Anything

• 3D objects

How is a scanned image converted into an electronic form?

• with an ADC

• with a DAC

Give an example of a 2D scanner

What colour is the bright xenon lamp used to scan a document?

What converts a scanned image to an electronic signal?

• CCD

• ADC

• CAC

• DAC

What allows scanned text to be converted to a text file format?

• OCR

• AQA

• CCD

• EDEXCEL

• CIE

What does OCR stand for?

• Optical character recognition

• Oxford, Cambridge, and RSA

• Office for Civil Rights

How are 2D scanners used in airports?

• They read passports

• They scan bags for illegal goods

• They scan people for illegal goods

• They carry out a facial recognition scan

What is 3D scanning based?

• tomography

• chromatography

• Escatology

• frequencies

Answer explanation

This builds up an image using slices.