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Daily Practice · GCSE Computer Science

July 1954 5-a-day

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July 1954

31 sheets · 155 questions · GCSE

July 1954 compilationAll answers

Every sheet in July 1954

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 1954Convert the 4-bit binary number 1101 to denary.
  2. 2nd July 1954Two 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.
  3. 3rd July 1954State why an organisation might employ penetration testers to test its network.
  4. 4th July 1954Describe what a nested loop does when it processes a 2D array.
  5. 5th July 1954State one example of a file format that commonly uses lossy compression.
  6. 6th July 1954State how many bits are in one byte, and how many bytes are in one kibibyte (KiB).
  7. 7th July 1954State whether the source code of proprietary (closed source) software is normally available for the public to view.
  8. 8th July 1954Write one line of pseudocode that converts the string stored in heightInput into a real number and stores it in a variable called height.
  9. 9th July 1954A programmer wants any syntax error in their program to be reported before the program starts running at all. State whether a compiler or an interpreter behaves this way, and explain why.
  10. 10th July 1954Order these units of data from smallest to largest: megabyte, byte, gigabyte, kilobyte.
  11. 11th July 1954Give two reasons why network communication is divided into layers.
  12. 12th July 1954Give one example of erroneous test data for a field that only accepts whole numbers from 1 to 10.
  13. 13th July 1954A table called bookings has fields bookingId, customerName and eventDate. Write an SQL statement that deletes the booking with bookingId 45.
  14. 14th July 1954Each 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.
  15. 15th July 1954Which flowchart symbol shape is used to represent a decision point (e.g. a yes/no branch)?
  16. 16th July 1954State the two values a Boolean data type can hold.
  17. 17th July 1954Convert the denary number 39 to an 8-bit binary number, showing your working.
  18. 18th July 1954Calculate the number of cables needed to connect 8 computers in a full mesh topology, where every computer connects directly to every other computer.
  19. 19th July 1954Explain why an interpreter is often preferred while a program is being written.
  20. 20th July 1954Convert the hexadecimal number 1A to denary.
  21. 21st July 1954Convert the denary number 156 to an 8 bit binary number.
  22. 22nd July 1954Which type of malware can replicate itself and spread across a network without attaching to another program or needing a user to run it?
  23. 23rd July 1954A 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.
  24. 24th July 1954An image uses a colour depth of 2 bits per pixel. Calculate the maximum number of different colours it can represent.
  25. 25th July 1954A 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.
  26. 26th July 1954Describe two negative consequences of throwing away old computer hardware instead of recycling it.
  27. 27th July 1954Write a function called isEven that takes one integer parameter, num, and returns True if num is even and False otherwise.
  28. 28th July 1954Give one specific way this code could be refined without changing what it does: a = 5, b = 3, c = a + b, PRINT c
  29. 29th July 1954A 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.
  30. 30th July 1954State the layer that IP operates in, and describe its job.
  31. 31st July 1954Explain why iterative testing, carried out throughout development, tends to make errors cheaper to fix than relying only on final testing.