Computer Science · May / June 2024 · Paper 12 · Question 3
0478
As printed in the paper
The question as text
Binary is a base 2 number system.
Read automatically from the paper; the printed page above is exact.
Show the answer and mark scheme
3(a)[1]
Hexadecimal
3(b)(i)[3]
1010
110010
11001001
3(b)(ii)[2]
Two from:
Computers use logic gates/switches …… that only process the values 1 and 0 // that only have two states3(c)[3]
One mark for evidence of working, for example 2 carries
One mark for each correct nibble (Max 2)
1 1
0 0 1 1 0 0 0 0
0 1 1 0 0 1 1 0
1 0 0 1 0 1 1 0
3(d)[2]
One marking for evidence of working
For example, flip and add
One mark for correct binary
11100000
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