A toy store gives each of the toys it sells a unique code. The codes are 3-digit hexadecimal codes, for example A4B. A computer is used to store a database of the codes. The computer has 12-bit registers.

1. (a)Give the largest hexadecimal number that can be stored in a 12-bit register.[1]
2. (b)Give the largest denary number that can be stored in a 12-bit register.[1]
3. (c)Two toys have the hexadecimal codes 429 and 1A3. Convert the two hexadecimal codes to 12-bit binary numbers. 429 1A3[2]
4. (d)Two binary numbers that are stored in the registers are 100010100001 and 011100001011. Convert the two binary numbers to hexadecimal numbers. 100010100001 011100001011[2]
5. (e)(i)Identify the name of the item of hardware.[1]
6. (e)(ii)Tick (✔) one box to show whether a barcode scanner is a type of input, output, process or storage device. A input B output C process D storage[1]
7. (e)(iii)The barcode scanner contains a sensor. Identify the type of sensor that the barcode scanner could contain.[1]
8. (e)(iv)A backup of the database is made at the end of each day using optical storage. Describe how the database is written to the optical storage.[4]