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Daily Practice · GCSE Computer Science

October 2009 - GCSE Computer Science 5-a-day

Every GCSE Computer Science sheet published in October 2009, with answers. Systems, data representation, networks, algorithms and programming.

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October 2009

31 sheets · 155 questions · GCSE

October 2009 compilationAll answers

Every sheet in October 2009

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 2009Explain why a running maximum should be initialised to the first element of the array rather than to 0.
  2. 2nd October 2009State one example of a file format that commonly uses lossy compression.
  3. 3rd October 2009State how many bits are in one byte, and how many bytes are in one kibibyte (KiB).
  4. 4th October 2009State whether the source code of proprietary (closed source) software is normally available for the public to view.
  5. 5th October 2009Write one line of pseudocode that converts the string stored in heightInput into a real number and stores it in a variable called height.
  6. 6th October 2009State the value returned by LENGTH(word) if word stores the string 'Computer'.
  7. 7th October 2009Order these units of data from smallest to largest: megabyte, byte, gigabyte, kilobyte.
  8. 8th October 2009Name the four layers of the TCP/IP model in order from the one closest to the user.
  9. 9th October 2009Give one example of erroneous test data for a field that only accepts whole numbers from 1 to 10.
  10. 10th October 2009A table called books has fields bookId, title, authorId and copiesAvailable. Write an SQL statement that selects the title of every book with more than 2 copies available.
  11. 11th October 2009Each pair from the previous question is stored using 2 bytes. Calculate the compression ratio achieved, given the uncompressed row (1 byte per pixel) uses 8 bytes.
  12. 12th October 2009Which flowchart symbol shape is used to represent a decision point (e.g. a yes/no branch)?
  13. 13th October 2009State the two values a Boolean data type can hold.
  14. 14th October 2009State how many different values can be represented using 5 bits, and explain your reasoning.
  15. 15th October 2009Calculate the number of cables needed to connect 8 computers in a full mesh topology, where every computer connects directly to every other computer.
  16. 16th October 2009A 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.
  17. 17th October 2009Convert the hexadecimal number 1A to denary.
  18. 18th October 2009Convert the denary number 156 to an 8 bit binary number.
  19. 19th October 2009Which type of malware can replicate itself and spread across a network without attaching to another program or needing a user to run it?
  20. 20th October 2009An array named temps holds 12 values. State the index of the first item and the index of the last item.
  21. 21st October 2009An image uses a colour depth of 2 bits per pixel. Calculate the maximum number of different colours it can represent.
  22. 22nd October 2009A CPU's cache has a hit rate of 80%. During a task the CPU makes 4000 requests for data. Calculate the number of cache hits and cache misses.
  23. 23rd October 2009Describe two negative consequences of throwing away old computer hardware instead of recycling it.
  24. 24th October 2009Write a function called isEven that takes one integer parameter, num, and returns True if num is even and False otherwise.
  25. 25th October 2009State the key difference between a procedure and a function.
  26. 26th October 2009A company backs up its files onto magnetic tape cartridges, each with a capacity of 3 TB. The company needs to back up 20 TB of data. Calculate the minimum number of cartridges needed.
  27. 27th October 2009State the difference between HTTP and HTTPS, and give one situation where HTTPS is essential.
  28. 28th October 2009Explain why iterative testing, carried out throughout development, tends to make errors cheaper to fix than relying only on final testing.
  29. 29th October 2009Give one advantage of a relational database over a flat-file database.
  30. 30th October 2009Define the term 'interrupt' as used to describe a signal received by a CPU.
  31. 31st October 2009An array called items contains [12, 45, 7, 30, 19] at indices 0 to 4. Describe how a linear search would locate the value 30, stating the number of comparisons needed.