Daily Practice · GCSE Computer Science
September 2019 - GCSE Computer Science 5-a-day
Every GCSE Computer Science sheet published in September 2019, with answers. Systems, data representation, networks, algorithms and programming.
Every sheet in September 2019
The same date always regenerates the same five questions, so a sheet you print today is the sheet a classmate prints tomorrow.
- 1st September 2019Given A = 1 and B = 1, state the value of A AND B.
- 2nd September 2019Convert the 8-bit binary number 01011010 to denary.
- 3rd September 2019Define a peer-to-peer network.
- 4th September 2019State why a program written in a high level language must be translated.
- 5th September 2019Convert the denary number 5 to a 4-bit binary number.
- 6th September 2019A CPU has a clock speed of 4.0 GHz. Calculate how many clock cycles it completes in 2 seconds.
- 7th September 2019A 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.
- 8th September 2019Describe what a nested loop does when it processes a 2D array.
- 9th September 2019A mono sound clip has a sample rate of 4000 Hz and lasts 2 seconds. Calculate the total number of samples taken.
- 10th September 2019State the type of program that is typically stored in ROM.
- 11th September 2019State one reason a small business might choose to use open source software instead of proprietary (closed source) software.
- 12th September 2019A FOR loop runs: total = 0, FOR i = 1 TO 4, total = total + i, NEXT i. State the value of total after the loop finishes.
- 13th September 2019Write 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.
- 14th September 2019State the typical maximum capacity of a single-layer DVD.
- 15th September 2019Give two reasons why network communication is divided into layers.
- 16th September 2019State what is meant by a syntax error.
- 17th September 2019State what a foreign key is used for.
- 18th September 2019What type of utility software reorganises files on a hard disk so fragmented parts are stored closer together?
- 19th September 2019Calculate the maximum number of comparisons required by a binary search on a sorted list of 512 items.
- 20th September 2019Given P = 0 and Q = 1, state the value of P OR Q.
- 21st September 2019A 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.
- 22nd September 2019A 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.
- 23rd September 2019Explain why an interpreter is often preferred while a program is being written.
- 24th September 2019Convert the 4-bit binary number 1101 to denary.
- 25th September 2019Two 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.
- 26th September 2019State why an organisation might employ penetration testers to test its network.
- 27th September 2019A 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.
- 28th September 2019State one example of a file format that commonly uses lossy compression.
- 29th September 2019State how many bits are in one byte, and how many bytes are in one kibibyte (KiB).
- 30th September 2019State whether the source code of proprietary (closed source) software is normally available for the public to view.