Computers manipulate binary patterns.
Convert the hexadecimal number 1F to 8-bit binary.
Mark scheme
Award one mark for each correct nibble in the correct order:
- 0001 (1)
- 1111 (1)
0 marks if the response is not 8-bit binary.
Example answers and how they were marked
Full marks2/2
0001 1111
Why: Each digit is 4 bits: 1 = 0001, F = 1111 (2).
Some marks1/2
0001 0000
Why: Converts F as if it were the next digit up. The first nibble is correct (1); the second is not.
No marks0/2
1111 0001
Why: The nibbles are in the wrong order. Neither nibble is correct.