Computer Science · Oct / Nov 2016 · Paper 12 · Question 11
2210
As printed in the paper
The question as text
A security system is installed in a house. A hexadecimal number is entered to activate or deactivate the alarm.
Read automatically from the paper; the printed page above is exact.
Show the answer and mark scheme
11(a)[3]
1 mark per nibble 0010 1010 1111 [3]
11(b)[6]
1 mark for identification of each sensor, max 2 for each description Infrared/motion sensor – Receives infrared rays/heat – Sends data to microprocessor – Receives microwaves – Placed in the corner of a room, across a doorway – Used to detect the heat of an intruder // used to detect if an infrared beam has been broken by an intruder Pressure sensor – Receives current if circuit created // stops receiving current if circuit is broken – Sends data to microprocessor – Placed on a window/door, at the entrance – Used to detect a change in pressure [6]
Make a free account to save your answers and see your weak topics and ask the AI why a wrong answer is wrong.