A bitmap image has a colour depth of 5 bits.
Identify the number of different colours that can be represented.
Mark scheme
- C 32 (1)
- The only correct answer is C. The correct answer is 32.
- A is not correct because 8 colours can be represented using 3 bits
- B is not correct because 16 colours can be represented using 4 bits
- D is not correct because 64 colours can be represented using 6 bits
Example answers and how they were marked
Full marks1/1
C 32
Why: Correct option; 2^5 = 32 different colours (1).
No marks0/1
B 16
Why: A near miss: 16 colours would need 4 bits, not 5, so the mark scheme gives it no mark.
No marks0/1
D 64
Why: 64 colours would need 6 bits, not 5; no mark.