
IGCSE Scanners and Cameras
Authored by Claire Firman
Computers
10th Grade
Used 58+ times

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19 questions
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1.
MULTIPLE CHOICE QUESTION
2 mins • 1 pt
Which statement about a scanner's operation does not belong?
A bright light illuminates the document
A head moves across the document. Scanned image is sent to lens
A light-sensitive sheet gets the focused image
Sheet is made up of a dozen pixels which record the light intensity
2.
MULTIPLE CHOICE QUESTION
2 mins • 1 pt
Face recognition software works in this way:
It measures & compares proportions of a person’s face with those stored
It measures & compares proportions of a person’s face with a passport photo
It measures nose, eyes and hair and compares with stored values
3.
MULTIPLE CHOICE QUESTION
2 mins • 1 pt
Which statement about a 3D scanner's operation does not belong?
Moving laser projects beam of laser light onto object
Two sensor cameras record changing distance and shape of laser in 3D
Shape of object appears as millions of points known as a “dot cloud"
Point cloud data is merged into a 3D representation of the object
4.
MULTIPLE CHOICE QUESTION
2 mins • 1 pt
Tomography means...
To image something by analysing the object in very thin slices
To use a tomograph laser for 3D scanning
Scanning in 3D or 2D using an advanced mological laser
5.
MULTIPLE CHOICE QUESTION
2 mins • 1 pt
Which statement about a camera's operation does not belong?
Breaks up what it sees through its lens into a grid of pixels
Shutter opens to let light onto a DVD sensor at the back of the lens
Intensity or colour of light is measured by millions of tiny sensors
Information is stored as an image in the camera’s memory
6.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Not a common kind of barcode:
UPC-A
Code 128
CP 256
7.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
To represent letters and numbers in a barcode, use
UPC-A
Code 128
Code 99-A
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