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CAT THEORY SA GRADE 11 COMPLETE QUESTIONS AND ANSWERS FROM THE 2ND EDITIONS TEST BOOK
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CAT THEORY SA GRADE 11 COMPLETE QUESTIONS AND ANSWERS FROM THE 2ND EDITIONS TEST BOOK LIFE GRADE 11
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CAT THEORY SA GRADE 11 COMPLETE QUESTIONSAND ANSWERS FROM THE 2ND EDITIONS TEST
BOOK LIFE GRADE 11
1. Name two input devices which can be used to input images into the
computer.
✔✔1. Scanner and digital camera
2. What would you say are the three main advantages of digital cameras,
other than any cost-related issues?
✔✔2. They allow one you to take hundreds or thousands of photos
(depending on the size of your memory card).
You can see the images immediately (and delete those you don't want).
You can easily transfer the images you want to edit to a computer
because they are already in digital format
3. Explain what a pixel is and its relationship to the quality and physical
size of a digital image.
✔✔3. Pixels form the basis of a digital image and are the small dot-like
elements that make up the image. The more pixels that are used to form
the image, the better the quality of the image and the more space it will
physically take to store the image and vice versa.
4. Describe one way in which you could transfer photographs from your
digital camera to your laptop computer without making use of a USB
cable.
✔✔4. You can take out the memory card and insert it into the laptop
either directly (if it has slot for it) or by using a card reader device
connected to the laptop, or you can transfer them wirelessly.
,5. An advert for a digital camera listed these specifications: 15 MP and
ISO 6400.
Explain the significance of these two specifications and what they
represent.
✔✔5. The MP specification means that the camera can take images with
a maximum resolution of 15 megapixels, i.e. the total number of pixels
that make up the picture. The bigger this specification, the better the
image quality.
The ISO rating refers to how sensitive the camera sensor is to light, i.e.
'how good' the camera is at taking pictures in low light without a flash.
6. Unlike a point-and-shoot camera, a DSLR camera allows you to
change lenses. What is the advantage of larger lenses?
✔✔6. They capture more light, which improves image quality and detail.
7. What is the problem with digital zoom as opposed to optical zoom on a
digital camera?
✔✔7. Optical zoom uses lenses on the camera to 'get closer' to the object
being photographed. Digital zoom works like the magnifying tool in
software and is nothing more than zooming into an existing image - it
reduces resolution and pixilates the image.
8. Your teacher has a hardcopy version of an old exam paper. He wants to
edit it as some of the questions have become outdated.
a) What does the term hardcopy refer to?
✔✔a) Text and images printed onto paper.
,b) Explain how your teacher can edit the exam paper in his word
processor.
✔✔b) Scan the hard copy with a scanner as an image. Then use OCR
(Optical Character Recognition) software to recognise the characters and
convert the image into a document that can be edited in a word
processor.
9. Your sister scanned an image she wants to use for a project but found
that it is nearly 5 GB in size. Give two ways in which she can reduce the
size of this stored image.
✔✔9. Reduce the resolution at which the image was scanned.
Reduce the colour depth / scan in grayscale.
Save in a compressed format such as jpeg.
10. Your school shop is considering introducing a bar-code system for the
books and stationery they sell.
Give two benefits a bar-coding system provides.
✔✔10. Barcode scanners are especially helpful in libraries and Point of
Sale (POS) systems for speeding up the checkout process.
Better stock control.
Increased accuracy.
11. The main purpose of a scanner is to scan images to convert and store
them in a digital format. Give three advantages of having data or images
scanned and stored in this way.
✔✔11. Any three advantages:
• Large documents consisting of many pages can be scanned into a single
digital file.
, • The electronic copies created do not take up office space such as paper
files.
• Scanned copies can be e-mailed instead of having to be faxed.
• Old photos and documents can be scanned and preserved and stored for
future generations
• Hard copy documents that contain typed text can be converted into an
editable document, for example to a Word document format, using OCR
(Optical Character Recognition) software, etc.
12. Your mother wants to scan all the old family photographs to preserve
them. Give one potential drawback that she might encounter during this
process.
✔✔12. Scanning can be slow and take a lot of time.
The quality of the digital images depends on the quality of the original
photographs.
13. A scanner was advertised with a specification of 24 bit colour depth.
Explain what the significance of this specification is and what it
represents.
✔✔13. Colour depth refers to the number of different colours that can be
represented by a pixel. The higher the number, the greater the number of
colours that can be represented and the larger the resulting image file will
be.
14. What is the main advantage in terms of supplying a URL in a QR
code?
✔✔14. QR codes provide a quick way to let people connect to your
website without having to type in (or remember) a web address.
Biometric input
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