Daily Practice · GCSE Computer Science
September 2009 - GCSE Computer Science 5-a-day
Every GCSE Computer Science sheet published in September 2009, with answers. Systems, data representation, networks, algorithms and programming.
Every sheet in September 2009
The same date always regenerates the same five questions, so a sheet you print today is the sheet a classmate prints tomorrow.
- 1st September 2009A password field requires between 6 and 12 characters. State two boundary data values that should be used to test this field.
- 2nd September 2009A 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;
- 3rd September 2009State one function carried out by the operating system of a computer.
- 4th September 2009In computational thinking, what is meant by the term 'decomposition'?
- 5th September 2009Given A = 1 and B = 1, state the value of A AND B.
- 6th September 2009Convert the 8-bit binary number 01011010 to denary.
- 7th September 2009Define a peer-to-peer network.
- 8th September 2009Name the translator used for assembly language and describe how it differs from a compiler.
- 9th September 2009Convert the denary number 5 to a 4-bit binary number.
- 10th September 2009A CPU has a clock speed of 4.0 GHz. Calculate how many clock cycles it completes in 2 seconds.
- 11th September 2009A 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.
- 12th September 2009Explain what happens if a program tries to read index 5 of an array declared with 5 elements.
- 13th September 2009A mono sound clip has a sample rate of 4000 Hz and lasts 2 seconds. Calculate the total number of samples taken.
- 14th September 2009State the type of program that is typically stored in ROM.
- 15th September 2009State one reason a small business might choose to use open source software instead of proprietary (closed source) software.
- 16th September 2009A FOR loop runs: total = 0, FOR i = 1 TO 4, total = total + i, NEXT i. State the value of total after the loop finishes.
- 17th September 2009Write 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.
- 18th September 2009State the typical maximum capacity of a single-layer DVD.
- 19th September 2009Define the term protocol.
- 20th September 2009State what is meant by a syntax error.
- 21st September 2009State what a foreign key is used for.
- 22nd September 2009What type of utility software reorganises files on a hard disk so fragmented parts are stored closer together?
- 23rd September 2009Calculate the maximum number of comparisons required by a binary search on a sorted list of 512 items.
- 24th September 2009Given P = 0 and Q = 1, state the value of P OR Q.
- 25th September 2009A 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.
- 26th September 2009A 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.
- 27th September 2009Explain the purpose of a breakpoint.
- 28th September 2009Convert the 4-bit binary number 1101 to denary.
- 29th September 2009Two 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.
- 30th September 2009State why an organisation might employ penetration testers to test its network.