1. Explain how ASCII is used to represent text in a computer system

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Presentation transcript:

1. Explain how ASCII is used to represent text in a computer system 1. Explain how ASCII is used to represent text in a computer system. (3 marks)

2. State what is meant by the character set of a computer. (1 mark)

3. Unicode is also used to represent text in a computer system 3. Unicode is also used to represent text in a computer system. Explain the difference between the character sets of Unicode and ASCII. (2 marks)

4. Some of the file formats use compression 4. Some of the file formats use compression. Explain the importance of compressing files when transmitting them via the internet. (2 marks)

5. Describe the difference between lossy and lossless compression and give an example where each would be used. (4 marks)

6. Convert the hexadecimal number 6A to binary. (2 marks)

7. Convert the binary number 00111101 to hexadecimal. (2 marks)

8. Explain why hexadecimal numbers are often used to represent binary numbers. (2 marks)

9. Explain how sampling intervals and compression can affect the size of a sound file and the quality of its playback. (8 marks)

10. What is meant by the resolution of the picture? (1 mark)

11. How does the resolution affect the size of the bitmap file 11. How does the resolution affect the size of the bitmap file? (2 marks)

12. Convert the denary number 106 into Hexadecimal. (2 marks)

13. Peter takes a high-resolution picture with a digital camera 13. Peter takes a high-resolution picture with a digital camera. The picture is stored in a bitmap file. Describe how a picture is stored in a bitmap file. (3 marks)

14. Add the following bytes. 11011000 + 01100000 (2 marks)

15. Explain how reducing the number of colours in an image can reduce its file size. (2 marks)

16. The final image file may contain metadata 16. The final image file may contain metadata. Describe, using an example, what is meant by metadata. (2 marks)

An algorithm could be written as pseudo code 17. An algorithm could be written as pseudo code (6 marks)

18. State the purpose of: a)Secondary Storage b)RAM c)ROM d)Virtual Memory (9)