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Grade 11 · Computer science

Grade 11 Computer science diagnostic

15 questions on digital literacy, data systems, algorithms & logic and data structures, plus 3 from Grade 10. Answer what you can, then check your answers to see which topics are secure and what to practise next.

15 questions4 topicsAbout 15 minutesSet 3 of 5

Skip a question if you do not know the answer. It is better than guessing, because it shows what to practise.

1Algorithms & logicAn outer loop runs 2 times. Each time, an inner loop prints once on each of 15 iterations. How many prints occur?
2Algorithms & logicAdvanced computing concepts: which term fits this description? Transforming data into a form readable only with the appropriate key or method.
3Algorithms & logicPython: 17 // 5. What value is returned?
4Data structuresA sorted array has 127 entries. Binary search always inspects a middle entry. What is the largest number of inspected entries for a successful search? Round the final result to 4 decimal places if needed.
5Data structuresA sorted array has 255 entries. Binary search always inspects a middle entry. What is the largest number of inspected entries for a successful search? Round the final result to 4 decimal places if needed.
6Data structuresA sorted array has 262143 entries. Binary search always inspects a middle entry. What is the largest number of inspected entries for a successful search? Round the final result to 4 decimal places if needed.
7Data systemsA 673 MB payload is sent over a constant 135 Mbps link. Use decimal MB and ignore overhead. Find transfer time. Round the final result to 4 decimal places if needed. Answer in s.
s
8Data systemsA 340 MB payload is sent over a constant 170 Mbps link. Use decimal MB and ignore overhead. Find transfer time. Round the final result to 4 decimal places if needed. Answer in s.
s
9Data systemsA 433 MB payload is sent over a constant 185 Mbps link. Use decimal MB and ignore overhead. Find transfer time. Round the final result to 4 decimal places if needed. Answer in s.
s
10Digital literacyA raw image is 15 × 56 pixels with 4 bytes per pixel. Ignoring headers and compression, how many bytes?
11Digital literacyWhich field is unnecessary for an anonymous arithmetic practice tool?
12Digital literacyWhich video feature helps users who cannot hear its speech?

From Grade 10

These questions check skills from the grade below, so gaps can be spotted early.

13Digital literacy (Grade 10)A file shrinks from 520 KB to 26 KB. What percentage of its original size was saved?
%
14Algorithms & logic (Grade 10)Convert the binary number 11011001 to decimal.
15Digital literacy (Grade 10)How many bits are in 4698 bytes?