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Daily Practice · GCSE Computer Science

April 2016 - GCSE Computer Science 5-a-day

Every GCSE Computer Science sheet published in April 2016, with answers. Systems, data representation, networks, algorithms and programming.

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April 2016

30 sheets · 150 questions · GCSE

April 2016 compilationAll answers

Every sheet in April 2016

The same date always regenerates the same five questions, so a sheet you print today is the sheet a classmate prints tomorrow.

  1. 1st April 2016A simple cipher shifts every letter 2 places forward in the alphabet, wrapping around so Y becomes A and Z becomes B. Encrypt the plaintext CAT using this cipher.
  2. 2nd April 2016Explain what happens if a program tries to read index 5 of an array declared with 5 elements.
  3. 3rd April 2016A mono sound clip has a sample rate of 4000 Hz and lasts 2 seconds. Calculate the total number of samples taken.
  4. 4th April 2016State the type of program that is typically stored in ROM.
  5. 5th April 2016State one reason a small business might choose to use open source software instead of proprietary (closed source) software.
  6. 6th April 2016A FOR loop runs: total = 0, FOR i = 1 TO 4, total = total + i, NEXT i. State the value of total after the loop finishes.
  7. 7th April 2016State the pseudocode operator commonly used to join (concatenate) two strings, then show how it joins 'Rev' and 'ision' to produce 'Revision'.
  8. 8th April 2016State the typical maximum capacity of a single-layer DVD.
  9. 9th April 2016Define the term protocol.
  10. 10th April 2016State what is meant by a syntax error.
  11. 11th April 2016Define the term 'primary key' as used in a database table.
  12. 12th April 2016What type of utility software reorganises files on a hard disk so fragmented parts are stored closer together?
  13. 13th April 2016Calculate the maximum number of comparisons required by a binary search on a sorted list of 512 items.
  14. 14th April 2016Given P = 0 and Q = 1, state the value of P OR Q.
  15. 15th April 2016Convert the 8-bit binary number 10110100 directly to hexadecimal by splitting it into nibbles.
  16. 16th April 2016A network administrator is connecting 10 computers in a server room. Calculate the number of cables needed for a full mesh topology, and state the number needed for a star topology with one central switch.
  17. 17th April 2016Explain the purpose of a breakpoint.
  18. 18th April 2016Convert the 4-bit binary number 1101 to denary.
  19. 19th April 2016Two CPUs are compared for a task optimised for multiple cores: CPU A has 2 cores at 4.2 GHz; CPU B has 6 cores at 3.0 GHz. Explain which CPU is likely to perform better for this task.
  20. 20th April 2016State why an organisation might employ penetration testers to test its network.
  21. 21st April 2016Explain why a running maximum should be initialised to the first element of the array rather than to 0.
  22. 22nd April 2016State one example of a file format that commonly uses lossy compression.
  23. 23rd April 2016State how many bits are in one byte, and how many bytes are in one kibibyte (KiB).
  24. 24th April 2016State whether the source code of proprietary (closed source) software is normally available for the public to view.
  25. 25th April 2016Write one line of pseudocode that converts the string stored in heightInput into a real number and stores it in a variable called height.
  26. 26th April 2016A function is defined as: FUNCTION addTax(price) RETURN price x 1.2 ENDFUNCTION. Another line of code runs: total <- addTax(20) + addTax(30). Trace both function calls and state the final value of total.
  27. 27th April 2016Order these units of data from smallest to largest: megabyte, byte, gigabyte, kilobyte.
  28. 28th April 2016Name the four layers of the TCP/IP model in order from the one closest to the user.
  29. 29th April 2016Give one example of erroneous test data for a field that only accepts whole numbers from 1 to 10.
  30. 30th April 2016A table called staff has fields staffId, name, department and salary, storing these records: staffId | name | department | salary, 1 | Ben | Sales | 24000, 2 | Chloe | IT | 31000, 3 | Dan | Sales | 27000. State which staffId(s) would be returned by: SELECT staffId FROM staff WHERE department = 'Sales' AND salary > 25000;