Daily Practice · GCSE Computer Science
December 2015 - GCSE Computer Science 5-a-day
Every GCSE Computer Science sheet published in December 2015, with answers. Systems, data representation, networks, algorithms and programming.
Every sheet in December 2015
The same date always regenerates the same five questions, so a sheet you print today is the sheet a classmate prints tomorrow.
- 1st December 2015State one function carried out by the operating system of a computer.
- 2nd December 2015In computational thinking, what is meant by the term 'decomposition'?
- 3rd December 2015Given A = 1 and B = 1, state the value of A AND B.
- 4th December 2015Convert the 8-bit binary number 01011010 to denary.
- 5th December 2015Define a peer-to-peer network.
- 6th December 2015Explain the purpose of a breakpoint.
- 7th December 2015Convert the denary number 5 to a 4-bit binary number.
- 8th December 2015A CPU has a clock speed of 4.0 GHz. Calculate how many clock cycles it completes in 2 seconds.
- 9th December 2015A 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.
- 10th December 2015Explain why a running maximum should be initialised to the first element of the array rather than to 0.
- 11th December 2015A mono sound clip has a sample rate of 4000 Hz and lasts 2 seconds. Calculate the total number of samples taken.
- 12th December 2015State the type of program that is typically stored in ROM.
- 13th December 2015State one reason a small business might choose to use open source software instead of proprietary (closed source) software.
- 14th December 2015A FOR loop runs: total = 0, FOR i = 1 TO 4, total = total + i, NEXT i. State the value of total after the loop finishes.
- 15th December 2015Write the pseudocode header and body for a function called isAdult that takes one integer parameter called age and returns True if age is 18 or over.
- 16th December 2015State the typical maximum capacity of a single-layer DVD.
- 17th December 2015Name the four layers of the TCP/IP model in order from the one closest to the user.
- 18th December 2015State what is meant by a syntax error.
- 19th December 2015State what a foreign key is used for.
- 20th December 2015What type of utility software reorganises files on a hard disk so fragmented parts are stored closer together?
- 21st December 2015Calculate the maximum number of comparisons required by a binary search on a sorted list of 512 items.
- 22nd December 2015Given P = 0 and Q = 1, state the value of P OR Q.
- 23rd December 2015A 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.
- 24th December 2015A 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.
- 25th December 2015A 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.
- 26th December 2015Convert the 4-bit binary number 1101 to denary.
- 27th December 2015Two 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.
- 28th December 2015State why an organisation might employ penetration testers to test its network.
- 29th December 2015An array named temps holds 12 values. State the index of the first item and the index of the last item.
- 30th December 2015State one example of a file format that commonly uses lossy compression.
- 31st December 2015State how many bits are in one byte, and how many bytes are in one kibibyte (KiB).