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Daily Practice · GCSE Computer Science

July 1998 - GCSE Computer Science 5-a-day

Every GCSE Computer Science sheet published in July 1998, with answers. Systems, data representation, networks, algorithms and programming.

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July 1998

31 sheets · 155 questions · GCSE

July 1998 compilationAll answers

Every sheet in July 1998

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 1998A pseudocode algorithm is: count <- 0, x <- 10, WHILE x > 0, count <- count + 1, x <- x - 3, ENDWHILE, OUTPUT count. Complete a trace table for x and count, laid out as x | count, then state the value output.
  2. 2nd July 1998A 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.
  3. 3rd July 1998A 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.
  4. 4th July 1998Convert the 4-bit binary number 1101 to denary.
  5. 5th July 1998Two 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.
  6. 6th July 1998State why an organisation might employ penetration testers to test its network.
  7. 7th July 1998An array named temps holds 12 values. State the index of the first item and the index of the last item.
  8. 8th July 1998State one example of a file format that commonly uses lossy compression.
  9. 9th July 1998State how many bits are in one byte, and how many bytes are in one kibibyte (KiB).
  10. 10th July 1998State whether the source code of proprietary (closed source) software is normally available for the public to view.
  11. 11th July 1998Write one line of pseudocode that converts the string stored in heightInput into a real number and stores it in a variable called height.
  12. 12th July 1998State the value returned by LENGTH(word) if word stores the string 'Computer'.
  13. 13th July 1998Order these units of data from smallest to largest: megabyte, byte, gigabyte, kilobyte.
  14. 14th July 1998State the difference between HTTP and HTTPS, and give one situation where HTTPS is essential.
  15. 15th July 1998Give one example of erroneous test data for a field that only accepts whole numbers from 1 to 10.
  16. 16th July 1998A 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.
  17. 17th July 1998Each 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.
  18. 18th July 1998Which flowchart symbol shape is used to represent a decision point (e.g. a yes/no branch)?
  19. 19th July 1998State the two values a Boolean data type can hold.
  20. 20th July 1998State how many different values can be represented using 5 bits, and explain your reasoning.
  21. 21st July 1998Calculate the number of cables needed to connect 8 computers in a full mesh topology, where every computer connects directly to every other computer.
  22. 22nd July 1998State why a program written in a high level language must be translated.
  23. 23rd July 1998Convert the hexadecimal number 1A to denary.
  24. 24th July 1998Convert the denary number 156 to an 8 bit binary number.
  25. 25th July 1998Which type of malware can replicate itself and spread across a network without attaching to another program or needing a user to run it?
  26. 26th July 1998Describe what a nested loop does when it processes a 2D array.
  27. 27th July 1998An image uses a colour depth of 2 bits per pixel. Calculate the maximum number of different colours it can represent.
  28. 28th July 1998A 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.
  29. 29th July 1998Describe two negative consequences of throwing away old computer hardware instead of recycling it.
  30. 30th July 1998Write a function called isEven that takes one integer parameter, num, and returns True if num is even and False otherwise.
  31. 31st July 1998State the key difference between a procedure and a function.