Data Representation Questions
1 Past Papers
OCR Past Papers filtered for AQA spec
2 Data Representation, exam style questions
Binary to Denary Conversions
- State the denary representation of the binary number
10100101
(1)
- State the denary representation of the binary number
00101111
(1)
- State the denary representation of the binary number
11100011
(1)
- State the denary representation of the binary number
11110001
(1)
- State the denary representation of the binary number
10101101
(1)
Denary to Binary Conversions
- State the binary representation of the denary number
42
(1)
- State the binary representation of the denary number
97
(1)
- State the binary representation of the denary number
128
(1)
- State the binary representation of the denary number
200
(1)
- State the binary representation of the denary number
247
(1)
Hexadecimal to Denary Conversions
- State the denary representation of the hexadecimal number
42
(2)
- State the denary representation of the hexadecimal number
A9
(2)
- State the denary representation of the hexadecimal number
8F
(2)
- State the denary representation of the hexadecimal number
AF
(2)
- State the denary representation of the hexadecimal number
CC
(2)
Denary to Hexadecimal Conversions
- State the hex representation of the denary number
42
(2)
- State the hex representation of the denary number
97
(2)
- State the hex representation of the denary number
122
(2)
- State the hex representation of the denary number
201
(2)
- State the hex representation of the denary number
248
(2)
Binary and character encoding
- Give one reason why we use binary to represent data in computers (1)
- Give one reason why programmers often use hexadecimal, instead of binary, to represent numbers. (1)
- The UTF-8 character encoding scheme can use up to 6 bytes to encode each character. How many bits is this? (1)
- What is the total number of characters that could be encoded under the UTF-8 standard? (1)
- Give one advantage and one disadvantage the UTF-8 character encoding scheme has over the ASCII character encoding scheme. (2)
Sound and image representation
- Describe how a 1 minute analogue recording of a musician playing an instrument, could be represented in binary. (3)
- Describe how a full colour document could be represented in binary when it is scanned. (3)
- What is meant by the term compression? (1)
- What is the difference between lossy and lossless compression? (2)
- Give one advantage and one disadvantage of lossy compression formats. (2)