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Input devices questions

Q1. Why is a ‘qwerty’ keyboard called a ‘qwerty’ keyboard?
Q2. Who might use a graphics tablet and what might they use it for?
Q3. How does a scanner work when scanning a picture?
Q4. Explain how a video capture card works. 
Q5.
What is a 'peripheral'?
Q6. What is a 'port' used for?
Q7. Describe what a digital signal is.
Q8. Describe what an analogue signal is.
Q9. What is a bit map?
Q10. Why are picture files turned into e.g. GIF or JPG formats?

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