A flower shop has a room that has an air-conditioning system. It is used to keep the room at a constant temperature for storing flowers. The owner uses a keypad to set the temperature for the room.

1. (a)Tick (✔) one box to show whether a keypad is an example of an input, output, process or storage device. A input B output C process D storage[1]
2. (b)(i)Give the binary number that would be stored when the denary number 24 is entered.[1]
3. (b)(ii)Give the binary number that would be stored when the denary number 101 is entered.[1]
4. (b)(iii)The binary number 00010011 is stored in the register. Give the denary number that has been entered for this binary number to be stored.[1]
5. (b)(iv)The binary number 00100010 is stored in the register. Give the denary number that has been entered for this binary number to be stored.[1]
6. (c)(i)Give the binary number that is stored in the register to display the error code 51.[1]
7. (c)(ii)Give the binary number that is stored in the register to display the error code E3.[1]
8. (c)(iii)Give the hexadecimal number that is displayed when the binary number 10000010 is stored in the register.[1]
9. (d)If the owner of the shop wants to make the room very cold, she may need to enter a negative denary number. The negative denary number could be represented using two's complement. Give the two's complement 8-bit binary integer that would be stored for the temperature –5. Show all your working.[2]
10. (e)(i)Tick (✔) one box to show whether the sensor is an example of an input, output, process or storage device. A input B output C process D storage[1]
11. (e)(ii)The temperature sensor continuously sends analogue data to the microprocessor. This data is then converted to digital. Explain how the microprocessor keeps the temperature of the room at a constant level.[3]
12. (f)The air-conditioning system is an example of an embedded system. Explain why the air-conditioning system is an embedded system.[2]