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Using binary codes to represent characters questions

Q1. Describe how letters, numbers and characters on a keyboard are stored by computers.
Q2. Explain why no two keyboard symbols have the same 8 bit code.
Q3. Why do all computers use the same codes for each of the keyboard characters? 
Q4.
What is the ASCII code for A?
Q5.
 What is the ASCII code for a?
Q6. What is the ASCII code for 1?
Q7. What is the ASCII code for 0 (zero)?
Q8. What is the ASCII code for the space key?
Q9. What is the ASCII code for null?
Q10. What is the ASCII code for Boo?

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