Computer Science · Oct / Nov 2020 · Paper 11 · Question 2
0478
As printed in the paper
The question as text
Ron is attending a music concert. He has bought three tickets. Each ticket number is displayed as a hexadecimal number.
Read automatically from the paper; the printed page above is exact.
Show the answer and mark scheme
2(a)[6]
One mark for each correct binary conversion
One mark for each correct denary conversion
Hexadecimal
12-bit binary value
Denary value
ticket number
028
0000 0010 1000
40
1A9
0001 1010 1001
425
20C
0010 0000 1100
524
2(b)[7]
Seven from:
Camera captures code // Laser/light shone on codeBlack squares reflect different light to whiteCorner squares are used for alignmentPattern converted to digital data // by example(Digital) data sent to microprocessorThere is a database of valid QR codesData compared to stored values/valid QR codes …… If data matches entry is granted is raised… If data matches count is incremented… If data does not match, entry is denied
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