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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 1 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 6 times. Each time, an inner loop prints once on each of 17 iterations. How many prints occur?
2Algorithms & logicAdvanced computing concepts: which term fits this description? Determining which actions an authenticated or identified entity is permitted to perform.
3Algorithms & logicPython: 17 // 5. What value is returned?
4Data structuresA sorted array has 2097151 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 2047 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 1048575 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 736 MB payload is sent over a constant 10 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 394 MB payload is sent over a constant 55 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 482 MB payload is sent over a constant 150 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 169 × 162 pixels with 2 bytes per pixel. Ignoring headers and compression, how many bytes?
11Digital literacyWhich field is unnecessary for an anonymous arithmetic practice tool?
12Digital literacyWhich is the best label for a button that saves work?

From Grade 10

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

13Algorithms & logic (Grade 10)FOR i FROM 2 TO 47 INCLUSIVE STEP 5: print i. How many numbers are printed?
14Digital literacy (Grade 10)A file shrinks from 1600 KB to 240 KB. What percentage of its original size was saved?
%
15Algorithms & logic (Grade 10)Convert the binary number 100110110 to decimal.