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Daily Practice · GCSE Computer Science

July 1993 - GCSE Computer Science 5-a-day

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July 1993

31 sheets · 155 questions · GCSE

July 1993 compilationAll answers

Every sheet in July 1993

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 1993Calculate the maximum number of comparisons required by a binary search on a sorted list of 512 items.
  2. 2nd July 1993Given P = 0 and Q = 1, state the value of P OR Q.
  3. 3rd July 1993A 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.
  4. 4th July 1993A 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.
  5. 5th July 1993Explain why an interpreter is often preferred while a program is being written.
  6. 6th July 1993Convert the 4-bit binary number 1101 to denary.
  7. 7th July 1993Two 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.
  8. 8th July 1993State why an organisation might employ penetration testers to test its network.
  9. 9th July 1993A 2D array grid is declared as grid[4][6]. State how many rows and columns it has and how many elements it holds in total.
  10. 10th July 1993State one example of a file format that commonly uses lossy compression.
  11. 11th July 1993State how many bits are in one byte, and how many bytes are in one kibibyte (KiB).
  12. 12th July 1993State whether the source code of proprietary (closed source) software is normally available for the public to view.
  13. 13th July 1993Write one line of pseudocode that converts the string stored in heightInput into a real number and stores it in a variable called height.
  14. 14th July 1993State the value returned by LENGTH(word) if word stores the string 'Computer'.
  15. 15th July 1993Order these units of data from smallest to largest: megabyte, byte, gigabyte, kilobyte.
  16. 16th July 1993State the layer that IP operates in, and describe its job.
  17. 17th July 1993Give one example of erroneous test data for a field that only accepts whole numbers from 1 to 10.
  18. 18th July 1993A 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.
  19. 19th July 1993Each 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.
  20. 20th July 1993Which flowchart symbol shape is used to represent a decision point (e.g. a yes/no branch)?
  21. 21st July 1993State the two values a Boolean data type can hold.
  22. 22nd July 1993State how many different values can be represented using 5 bits, and explain your reasoning.
  23. 23rd July 1993Calculate the number of cables needed to connect 8 computers in a full mesh topology, where every computer connects directly to every other computer.
  24. 24th July 1993Describe what syntax highlighting is and how it helps a programmer.
  25. 25th July 1993Convert the hexadecimal number 1A to denary.
  26. 26th July 1993Convert the denary number 156 to an 8 bit binary number.
  27. 27th July 1993Which type of malware can replicate itself and spread across a network without attaching to another program or needing a user to run it?
  28. 28th July 1993Trace 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).
  29. 29th July 1993An image uses a colour depth of 2 bits per pixel. Calculate the maximum number of different colours it can represent.
  30. 30th July 1993A 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.
  31. 31st July 1993Describe two negative consequences of throwing away old computer hardware instead of recycling it.