Daily Practice · GCSE Computer Science
June 2013 - GCSE Computer Science 5-a-day
Every GCSE Computer Science sheet published in June 2013, with answers. Systems, data representation, networks, algorithms and programming.
Every sheet in June 2013
The same date always regenerates the same five questions, so a sheet you print today is the sheet a classmate prints tomorrow.
- 1st June 2013A table called staff has fields staffId, name, department and salary, storing these records: staffId | name | department | salary, 1 | Ben | Sales | 24000, 2 | Chloe | IT | 31000, 3 | Dan | Sales | 27000. State which staffId(s) would be returned by: SELECT staffId FROM staff WHERE department = 'Sales' AND salary > 25000;
- 2nd June 2013State one function carried out by the operating system of a computer.
- 3rd June 2013In computational thinking, what is meant by the term 'decomposition'?
- 4th June 2013Given A = 1 and B = 1, state the value of A AND B.
- 5th June 2013Convert the 8-bit binary number 01011010 to denary.
- 6th June 2013Define a peer-to-peer network.
- 7th June 2013A 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.
- 8th June 2013Convert the denary number 5 to a 4-bit binary number.
- 9th June 2013A CPU has a clock speed of 4.0 GHz. Calculate how many clock cycles it completes in 2 seconds.
- 10th June 2013A 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.
- 11th June 2013An array named temps holds 12 values. State the index of the first item and the index of the last item.
- 12th June 2013A mono sound clip has a sample rate of 4000 Hz and lasts 2 seconds. Calculate the total number of samples taken.
- 13th June 2013State the type of program that is typically stored in ROM.
- 14th June 2013State one reason a small business might choose to use open source software instead of proprietary (closed source) software.
- 15th June 2013A FOR loop runs: total = 0, FOR i = 1 TO 4, total = total + i, NEXT i. State the value of total after the loop finishes.
- 16th June 2013Write 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.
- 17th June 2013State the typical maximum capacity of a single-layer DVD.
- 18th June 2013State the difference between HTTP and HTTPS, and give one situation where HTTPS is essential.
- 19th June 2013State what is meant by a syntax error.
- 20th June 2013State what a foreign key is used for.
- 21st June 2013What type of utility software reorganises files on a hard disk so fragmented parts are stored closer together?
- 22nd June 2013Calculate the maximum number of comparisons required by a binary search on a sorted list of 512 items.
- 23rd June 2013Given P = 0 and Q = 1, state the value of P OR Q.
- 24th June 2013A 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.
- 25th June 2013A 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.
- 26th June 2013State why a program written in a high level language must be translated.
- 27th June 2013Convert the 4-bit binary number 1101 to denary.
- 28th June 2013Two 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.
- 29th June 2013State why an organisation might employ penetration testers to test its network.
- 30th June 2013Describe what a nested loop does when it processes a 2D array.