Daily Practice · GCSE Computer Science
September 1954 5-a-day
Every sheet in September 1954
The same date always regenerates the same five questions, so a sheet you print today is the sheet a classmate prints tomorrow.
- 1st September 1954A photo file is 3.5 MB in size. Calculate its size in kilobytes (KB). Use 1 MB = 1000 KB.
- 2nd September 1954A streaming company records which shows each user watches and uses this to recommend similar shows. Explain one ethical concern this could raise, even if the company only uses the data to improve recommendations.
- 3rd September 1954State the most appropriate data type for storing a person's shoe size if only whole sizes (e.g. 7, 8, 9) are allowed.
- 4th September 1954State the pseudocode operator commonly used to join (concatenate) two strings, then show how it joins 'Rev' and 'ision' to produce 'Revision'.
- 5th September 1954Give one example of an optical secondary storage device.
- 6th September 1954A user reads the same email on a phone and a tablet, and deleting it on one deletes it on the other. Which protocol is in use and why?
- 7th September 1954State the term used for realistic data that a program would be expected to handle during normal use.
- 8th September 1954Define the term 'primary key' as used in a database table.
- 9th September 1954State the difference between lossy and lossless compression.
- 10th September 1954State the condition that must be met before a binary search can be used on an array.
- 11th September 1954A logic circuit has inputs C and D. C feeds into a NOT gate; the output of the NOT gate and D feed into an OR gate, giving output Y. Write the Boolean expression for Y and state its value when C = 1 and D = 0.
- 12th September 1954Convert the 8-bit binary number 10110100 directly to hexadecimal by splitting it into nibbles.
- 13th September 1954Which piece of network hardware connects a LAN to another network such as the internet, directing data packets based on IP address?
- 14th September 1954Name the translator used for assembly language and describe how it differs from a compiler.
- 15th September 1954Convert the denary number 45 to hexadecimal.
- 16th September 1954What does the acronym CPU stand for?
- 17th September 1954State what the term malware means.
- 18th September 1954Explain what happens if a program tries to read index 5 of an array declared with 5 elements.
- 19th September 1954An uncompressed file is 6000 KB. After lossless compression it is 1500 KB. Calculate the compression ratio in the form n:1 (original size : compressed size).
- 20th September 1954Which of RAM and ROM is volatile, meaning its contents are lost when the power is removed?
- 21st September 1954Which piece of UK legislation controls how organisations must store and use people's personal data?
- 22nd September 1954Given x = 5 and y = 8, state whether x < y AND x > 0 evaluates to True or False.
- 23rd September 1954A 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.
- 24th September 1954Give one reason why RAM on its own is not enough, and a computer also needs secondary storage.
- 25th September 1954Define the term protocol.
- 26th September 1954A password field requires between 6 and 12 characters. State two boundary data values that should be used to test this field.
- 27th September 1954A 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;
- 28th September 1954State one function carried out by the operating system of a computer.
- 29th September 1954In computational thinking, what is meant by the term 'decomposition'?
- 30th September 1954Given A = 1 and B = 1, state the value of A AND B.