Daily Practice · GCSE Computer Science
December 1955 5-a-day
Every sheet in December 1955
The same date always regenerates the same five questions, so a sheet you print today is the sheet a classmate prints tomorrow.
- 1st December 1955A photo file is 3.5 MB in size. Calculate its size in kilobytes (KB). Use 1 MB = 1000 KB.
- 2nd December 1955A 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 December 1955State the most appropriate data type for storing a person's shoe size if only whole sizes (e.g. 7, 8, 9) are allowed.
- 4th December 1955State the pseudocode operator commonly used to join (concatenate) two strings, then show how it joins 'Rev' and 'ision' to produce 'Revision'.
- 5th December 1955Give one example of an optical secondary storage device.
- 6th December 1955State the difference between HTTP and HTTPS, and give one situation where HTTPS is essential.
- 7th December 1955State the term used for realistic data that a program would be expected to handle during normal use.
- 8th December 1955Define the term 'primary key' as used in a database table.
- 9th December 1955State the difference between lossy and lossless compression.
- 10th December 1955State the condition that must be met before a binary search can be used on an array.
- 11th December 1955A 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 December 1955Convert the 8-bit binary number 10110100 directly to hexadecimal by splitting it into nibbles.
- 13th December 1955Which piece of network hardware connects a LAN to another network such as the internet, directing data packets based on IP address?
- 14th December 1955State why a program written in a high level language must be translated.
- 15th December 1955Convert the denary number 45 to hexadecimal.
- 16th December 1955What does the acronym CPU stand for?
- 17th December 1955State what the term malware means.
- 18th December 1955Describe what a nested loop does when it processes a 2D array.
- 19th December 1955An 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 December 1955Which of RAM and ROM is volatile, meaning its contents are lost when the power is removed?
- 21st December 1955Which piece of UK legislation controls how organisations must store and use people's personal data?
- 22nd December 1955Given x = 5 and y = 8, state whether x < y AND x > 0 evaluates to True or False.
- 23rd December 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.
- 24th December 1955Give one reason why RAM on its own is not enough, and a computer also needs secondary storage.
- 25th December 1955Give two reasons why network communication is divided into layers.
- 26th December 1955A password field requires between 6 and 12 characters. State two boundary data values that should be used to test this field.
- 27th December 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;
- 28th December 1955State one function carried out by the operating system of a computer.
- 29th December 1955In computational thinking, what is meant by the term 'decomposition'?
- 30th December 1955Given A = 1 and B = 1, state the value of A AND B.
- 31st December 1955Convert the 8-bit binary number 01011010 to denary.