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Daily Practice · GCSE Computer Science

July 2012 - GCSE Computer Science 5-a-day

Every GCSE Computer Science sheet published in July 2012, with answers. Systems, data representation, networks, algorithms and programming.

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July 2012

31 sheets · 155 questions · GCSE

July 2012 compilationAll answers

Every sheet in July 2012

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

  1. 1st July 2012Convert the denary number 5 to a 4-bit binary number.
  2. 2nd July 2012A CPU has a clock speed of 4.0 GHz. Calculate how many clock cycles it completes in 2 seconds.
  3. 3rd July 2012A 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.
  4. 4th July 2012Trace this algorithm with data = [4, 9, 2, 9, 7] and state the final output. total = 0; count = 0; for i = 0 to 4: if data[i] > 5 then total = total + data[i] and count = count + 1; next i; print(total, count).
  5. 5th July 2012A mono sound clip has a sample rate of 4000 Hz and lasts 2 seconds. Calculate the total number of samples taken.
  6. 6th July 2012State the type of program that is typically stored in ROM.
  7. 7th July 2012State one reason a small business might choose to use open source software instead of proprietary (closed source) software.
  8. 8th July 2012A FOR loop runs: total = 0, FOR i = 1 TO 4, total = total + i, NEXT i. State the value of total after the loop finishes.
  9. 9th July 2012State the pseudocode operator commonly used to join (concatenate) two strings, then show how it joins 'Rev' and 'ision' to produce 'Revision'.
  10. 10th July 2012State the typical maximum capacity of a single-layer DVD.
  11. 11th July 2012Explain the role of TCP when a large file is downloaded.
  12. 12th July 2012State what is meant by a syntax error.
  13. 13th July 2012Define the term 'primary key' as used in a database table.
  14. 14th July 2012What type of utility software reorganises files on a hard disk so fragmented parts are stored closer together?
  15. 15th July 2012Calculate the maximum number of comparisons required by a binary search on a sorted list of 512 items.
  16. 16th July 2012Given P = 0 and Q = 1, state the value of P OR Q.
  17. 17th July 2012Convert the 8-bit binary number 10110100 directly to hexadecimal by splitting it into nibbles.
  18. 18th July 2012A 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.
  19. 19th July 2012Give one advantage and one disadvantage of using a compiler.
  20. 20th July 2012Convert the 4-bit binary number 1101 to denary.
  21. 21st July 2012Two 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.
  22. 22nd July 2012State why an organisation might employ penetration testers to test its network.
  23. 23rd July 2012Write a loop in pseudocode that outputs every element of a 1D array named names of length 6.
  24. 24th July 2012State one example of a file format that commonly uses lossy compression.
  25. 25th July 2012State how many bits are in one byte, and how many bytes are in one kibibyte (KiB).
  26. 26th July 2012State whether the source code of proprietary (closed source) software is normally available for the public to view.
  27. 27th July 2012Write one line of pseudocode that converts the string stored in heightInput into a real number and stores it in a variable called height.
  28. 28th July 2012A 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.
  29. 29th July 2012Order these units of data from smallest to largest: megabyte, byte, gigabyte, kilobyte.
  30. 30th July 2012A user reads the same email on a phone and a tablet, and deleting it on one deletes it on the other. Which protocol is in use and why?
  31. 31st July 2012Give one example of erroneous test data for a field that only accepts whole numbers from 1 to 10.