Daily Practice · GCSE Computer Science
February 1955 5-a-day
Every sheet in February 1955
The same date always regenerates the same five questions, so a sheet you print today is the sheet a classmate prints tomorrow.
- 1st February 1955State one reason a small business might choose to use open source software instead of proprietary (closed source) software.
- 2nd February 1955A FOR loop runs: total = 0, FOR i = 1 TO 4, total = total + i, NEXT i. State the value of total after the loop finishes.
- 3rd February 1955State the pseudocode operator commonly used to join (concatenate) two strings, then show how it joins 'Rev' and 'ision' to produce 'Revision'.
- 4th February 1955State the typical maximum capacity of a single-layer DVD.
- 5th February 1955Define the term protocol.
- 6th February 1955State what is meant by a syntax error.
- 7th February 1955Define the term 'primary key' as used in a database table.
- 8th February 1955What type of utility software reorganises files on a hard disk so fragmented parts are stored closer together?
- 9th February 1955Calculate the maximum number of comparisons required by a binary search on a sorted list of 512 items.
- 10th February 1955Given P = 0 and Q = 1, state the value of P OR Q.
- 11th February 1955Convert the 8-bit binary number 10110100 directly to hexadecimal by splitting it into nibbles.
- 12th February 1955A 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.
- 13th February 1955Explain the purpose of a breakpoint.
- 14th February 1955Convert the 4-bit binary number 1101 to denary.
- 15th February 1955Two 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.
- 16th February 1955State why an organisation might employ penetration testers to test its network.
- 17th February 1955Explain why a running maximum should be initialised to the first element of the array rather than to 0.
- 18th February 1955State one example of a file format that commonly uses lossy compression.
- 19th February 1955State how many bits are in one byte, and how many bytes are in one kibibyte (KiB).
- 20th February 1955State whether the source code of proprietary (closed source) software is normally available for the public to view.
- 21st February 1955Write one line of pseudocode that converts the string stored in heightInput into a real number and stores it in a variable called height.
- 22nd February 1955A function is defined as: FUNCTION addTax(price) RETURN price x 1.2 ENDFUNCTION. Another line of code runs: total <- addTax(20) + addTax(30). Trace both function calls and state the final value of total.
- 23rd February 1955Order these units of data from smallest to largest: megabyte, byte, gigabyte, kilobyte.
- 24th February 1955Name the four layers of the TCP/IP model in order from the one closest to the user.
- 25th February 1955Give one example of erroneous test data for a field that only accepts whole numbers from 1 to 10.
- 26th February 1955A 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;
- 27th February 1955Each 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.
- 28th February 1955Which flowchart symbol shape is used to represent a decision point (e.g. a yes/no branch)?