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GCSE (9–1) Computer Science
J277/01 Computer Systems
Time allowed: 1 hour 30 minutes
*J27701*
*1426562763*
© OCR 2026 [601/8355/X]
DC (PQ) 334877/5
2
© OCR 2026
1
(a) The following table has either the binary or denary value of 3 numbers.
Complete the table by converting the 8-bit binary number into denary and the denary number into
8-bit binary.
8-bit Binary Denary
11110000
105
00011110
[3]
(b) Complete the table by writing the answer to each statement.
Statement Answer
The smallest denary number that can be
represented by a 4-bit binary number
The largest denary number that can be
represented by a 6-bit binary number
The maximum number of different colours
that can be represented with a colour depth of
7-bits
The minimum number of bits needed to
represent 150 different characters in a
character set
[4]
(c) Show the result of a left binary shift of 4 places on the binary number 00001111.
GCSE 9 1 Computer Science J277/01 Computer Systems
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