May/June 2026 Paper 11

2026 · 7 questions · 29 parts · 75 marks

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1(a)(i)Binary Hexadecimal Data UnitsMedium4 marks
A computer can store numbers and text in binary. The computer uses the UNICODE character set.
Complete the table by calculating the missing values.
characterdenarybinaryhexadecimal
҉
0001 1110 10011E9
@64
40
Ω9110011 1000 1111
Ψ
0001 0101 1101 011015D6
1(a)(ii)Text RepresentationEasy3 marks
Identify one other character set and explain how it is different from UNICODE.
Character set
0 words
How it differs from UNICODE
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1(b)Binary Arithmetic Signed NumbersEasy1 mark
The computer also uses two's complement.
Convert the 8-bit two's complement binary integer 01101011 into denary.

Answer

1(c)Binary Arithmetic Signed NumbersMedium2 marks
Subtract the denary number 30 from the binary number 01101011 using binary subtraction.
Result (8-bit binary)
1(d)Binary Hexadecimal Data UnitsEasy2 marks
Identify two differences between binary prefixes and decimal prefixes.

Answer

0 words