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Daily Practice · GCSE Computer Science

October 2013 - GCSE Computer Science 5-a-day

Every GCSE Computer Science sheet published in October 2013, with answers. Systems, data representation, networks, algorithms and programming.

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October 2013

31 sheets · 155 questions · GCSE

October 2013 compilationAll answers

Every sheet in October 2013

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

  1. 1st October 2013A CPU has a clock speed of 4.0 GHz. Calculate how many clock cycles it completes in 2 seconds.
  2. 2nd October 2013A 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.
  3. 3rd October 2013Explain why a running maximum should be initialised to the first element of the array rather than to 0.
  4. 4th October 2013A mono sound clip has a sample rate of 4000 Hz and lasts 2 seconds. Calculate the total number of samples taken.
  5. 5th October 2013State the type of program that is typically stored in ROM.
  6. 6th October 2013State one reason a small business might choose to use open source software instead of proprietary (closed source) software.
  7. 7th October 2013A FOR loop runs: total = 0, FOR i = 1 TO 4, total = total + i, NEXT i. State the value of total after the loop finishes.
  8. 8th October 2013State the pseudocode operator commonly used to join (concatenate) two strings, then show how it joins 'Rev' and 'ision' to produce 'Revision'.
  9. 9th October 2013State the typical maximum capacity of a single-layer DVD.
  10. 10th October 2013Name the four layers of the TCP/IP model in order from the one closest to the user.
  11. 11th October 2013State what is meant by a syntax error.
  12. 12th October 2013Define the term 'primary key' as used in a database table.
  13. 13th October 2013What type of utility software reorganises files on a hard disk so fragmented parts are stored closer together?
  14. 14th October 2013Calculate the maximum number of comparisons required by a binary search on a sorted list of 512 items.
  15. 15th October 2013Given P = 0 and Q = 1, state the value of P OR Q.
  16. 16th October 2013Convert the 8-bit binary number 10110100 directly to hexadecimal by splitting it into nibbles.
  17. 17th October 2013A 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.
  18. 18th October 2013A program compiles and runs but always outputs an average that is too small. State the type of error and explain why the translator did not report it.
  19. 19th October 2013Convert the 4-bit binary number 1101 to denary.
  20. 20th October 2013Two 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.
  21. 21st October 2013State why an organisation might employ penetration testers to test its network.
  22. 22nd October 2013An array named temps holds 12 values. State the index of the first item and the index of the last item.
  23. 23rd October 2013State one example of a file format that commonly uses lossy compression.
  24. 24th October 2013State how many bits are in one byte, and how many bytes are in one kibibyte (KiB).
  25. 25th October 2013State whether the source code of proprietary (closed source) software is normally available for the public to view.
  26. 26th October 2013Write one line of pseudocode that converts the string stored in heightInput into a real number and stores it in a variable called height.
  27. 27th October 2013A 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.
  28. 28th October 2013Order these units of data from smallest to largest: megabyte, byte, gigabyte, kilobyte.
  29. 29th October 2013State the difference between HTTP and HTTPS, and give one situation where HTTPS is essential.
  30. 30th October 2013Give one example of erroneous test data for a field that only accepts whole numbers from 1 to 10.
  31. 31st October 2013A 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;