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Daily Practice · GCSE Computer Science

March 2009 - GCSE Computer Science 5-a-day

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

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March 2009

31 sheets · 155 questions · GCSE

March 2009 compilationAll answers

Every sheet in March 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 March 2009Calculate the number of cables needed to connect 8 computers in a full mesh topology, where every computer connects directly to every other computer.
  2. 2nd March 2009Explain why an interpreter is often preferred while a program is being written.
  3. 3rd March 2009Convert the hexadecimal number 1A to denary.
  4. 4th March 2009Convert the denary number 156 to an 8 bit binary number.
  5. 5th March 2009Which type of malware can replicate itself and spread across a network without attaching to another program or needing a user to run it?
  6. 6th March 2009A 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.
  7. 7th March 2009An image uses a colour depth of 2 bits per pixel. Calculate the maximum number of different colours it can represent.
  8. 8th March 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.
  9. 9th March 2009Describe two negative consequences of throwing away old computer hardware instead of recycling it.
  10. 10th March 2009Write a function called isEven that takes one integer parameter, num, and returns True if num is even and False otherwise.
  11. 11th March 2009State the pseudocode operator commonly used to join (concatenate) two strings, then show how it joins 'Rev' and 'ision' to produce 'Revision'.
  12. 12th March 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.
  13. 13th March 2009State the layer that IP operates in, and describe its job.
  14. 14th March 2009Explain why iterative testing, carried out throughout development, tends to make errors cheaper to fix than relying only on final testing.
  15. 15th March 2009Define the term 'primary key' as used in a database table.
  16. 16th March 2009Define the term 'interrupt' as used to describe a signal received by a CPU.
  17. 17th March 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.
  18. 18th March 2009Evaluate X = NOT A AND B when A = 0 and B = 1.
  19. 19th March 2009Convert the 8-bit binary number 10110100 directly to hexadecimal by splitting it into nibbles.
  20. 20th March 2009Give one advantage of a star topology compared with a mesh topology.
  21. 21st March 2009Describe what syntax highlighting is and how it helps a programmer.
  22. 22nd March 2009Add the 8-bit binary numbers 00101101 and 00010011, giving your answer as an 8-bit binary number.
  23. 23rd March 2009State the three stages of the fetch-decode-execute cycle in the order they occur.
  24. 24th March 2009State one weakness of a simple shift cipher compared to modern encryption methods used on networks.
  25. 25th March 2009Trace 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).
  26. 26th March 2009Define the term 'pixel'.
  27. 27th March 2009Order these from fastest access speed to slowest: RAM, cache, registers, secondary storage.
  28. 28th March 2009Which piece of UK legislation makes it a criminal offence to gain unauthorised access to a computer system?
  29. 29th March 2009Evaluate the expression 23 DIV 4.
  30. 30th March 2009A 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.
  31. 31st March 2009A 1 TB hard disk drive costs 40 pounds. A 500 GB solid-state drive costs 60 pounds. Calculate the cost per gigabyte of each device, and state which is cheaper per GB. Use 1 TB = 1000 GB.