Revision Library
/Subjects/Computer Science/Daily Practice
Daily Practice · GCSE Computer Science

December 1981 5-a-day

← Today's GCSE Computer Science sheet

December 1981

31 sheets · 155 questions · GCSE

December 1981 compilationAll answers

Every sheet in December 1981

The same date always regenerates the same five questions, so a sheet you print today is the sheet a classmate prints tomorrow.

  1. 1st December 1981A simple cipher shifts every letter 2 places forward in the alphabet, wrapping around so Y becomes A and Z becomes B. Encrypt the plaintext CAT using this cipher.
  2. 2nd December 1981Trace 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).
  3. 3rd December 1981A mono sound clip has a sample rate of 4000 Hz and lasts 2 seconds. Calculate the total number of samples taken.
  4. 4th December 1981State the type of program that is typically stored in ROM.
  5. 5th December 1981State one reason a small business might choose to use open source software instead of proprietary (closed source) software.
  6. 6th December 1981A FOR loop runs: total = 0, FOR i = 1 TO 4, total = total + i, NEXT i. State the value of total after the loop finishes.
  7. 7th December 1981State the key difference between a procedure and a function.
  8. 8th December 1981State the typical maximum capacity of a single-layer DVD.
  9. 9th December 1981Explain the role of TCP when a large file is downloaded.
  10. 10th December 1981State what is meant by a syntax error.
  11. 11th December 1981Give one advantage of a relational database over a flat-file database.
  12. 12th December 1981What type of utility software reorganises files on a hard disk so fragmented parts are stored closer together?
  13. 13th December 1981Calculate the maximum number of comparisons required by a binary search on a sorted list of 512 items.
  14. 14th December 1981Given P = 0 and Q = 1, state the value of P OR Q.
  15. 15th December 1981Convert the hexadecimal number 3F to denary.
  16. 16th December 1981A 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.
  17. 17th December 1981Give one advantage and one disadvantage of using a compiler.
  18. 18th December 1981Convert the 4-bit binary number 1101 to denary.
  19. 19th December 1981Two 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.
  20. 20th December 1981State why an organisation might employ penetration testers to test its network.
  21. 21st December 1981Write a loop in pseudocode that outputs every element of a 1D array named names of length 6.
  22. 22nd December 1981State one example of a file format that commonly uses lossy compression.
  23. 23rd December 1981State how many bits are in one byte, and how many bytes are in one kibibyte (KiB).
  24. 24th December 1981State whether the source code of proprietary (closed source) software is normally available for the public to view.
  25. 25th December 1981Write one line of pseudocode that converts the string stored in heightInput into a real number and stores it in a variable called height.
  26. 26th December 1981A 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.
  27. 27th December 1981Order these units of data from smallest to largest: megabyte, byte, gigabyte, kilobyte.
  28. 28th December 1981A user reads the same email on a phone and a tablet, and deleting it on one deletes it on the other. Which protocol is in use and why?
  29. 29th December 1981Give one example of erroneous test data for a field that only accepts whole numbers from 1 to 10.
  30. 30th December 1981A table called bookings has fields bookingId, customerName and eventDate. Write an SQL statement that deletes the booking with bookingId 45.
  31. 31st December 1981Each 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.