Data Representation Questions

Table of Contents

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1 Past Papers

OCR Past Papers filtered for AQA spec

2 Data Representation, exam style questions

Binary to Denary Conversions

  1. State the denary representation of the binary number 10100101 (1)
  2. State the denary representation of the binary number 00101111 (1)
  3. State the denary representation of the binary number 11100011 (1)
  4. State the denary representation of the binary number 11110001 (1)
  5. State the denary representation of the binary number 10101101 (1)

Denary to Binary Conversions

  1. State the binary representation of the denary number 42 (1)
  2. State the binary representation of the denary number 97 (1)
  3. State the binary representation of the denary number 128 (1)
  4. State the binary representation of the denary number 200 (1)
  5. State the binary representation of the denary number 247 (1)

Hexadecimal to Denary Conversions

  1. State the denary representation of the hexadecimal number 42 (2)
  2. State the denary representation of the hexadecimal number A9 (2)
  3. State the denary representation of the hexadecimal number 8F (2)
  4. State the denary representation of the hexadecimal number AF (2)
  5. State the denary representation of the hexadecimal number CC (2)

Denary to Hexadecimal Conversions

  1. State the hex representation of the denary number 42 (2)
  2. State the hex representation of the denary number 97 (2)
  3. State the hex representation of the denary number 122 (2)
  4. State the hex representation of the denary number 201 (2)
  5. State the hex representation of the denary number 248 (2)

Binary and character encoding

  1. Give one reason why we use binary to represent data in computers (1)
  2. Give one reason why programmers often use hexadecimal, instead of binary, to represent numbers. (1)
  3. The UTF-8 character encoding scheme can use up to 6 bytes to encode each character. How many bits is this? (1)
  4. What is the total number of characters that could be encoded under the UTF-8 standard? (1)
  5. Give one advantage and one disadvantage the UTF-8 character encoding scheme has over the ASCII character encoding scheme. (2)

Sound and image representation

  1. Describe how a 1 minute analogue recording of a musician playing an instrument, could be represented in binary. (3)
  2. Describe how a full colour document could be represented in binary when it is scanned. (3)
  3. What is meant by the term compression? (1)
  4. What is the difference between lossy and lossless compression? (2)
  5. Give one advantage and one disadvantage of lossy compression formats. (2)