Daily Practice · GCSE Computer Science
June 1953 5-a-day
Every sheet in June 1953
The same date always regenerates the same five questions, so a sheet you print today is the sheet a classmate prints tomorrow.
- 1st June 1953A row of pixels is encoded using run-length encoding as: 3W 4B 3W. State the original row of pixels it represents.
- 2nd June 1953A photo file is 3.5 MB in size. Calculate its size in kilobytes (KB). Use 1 MB = 1000 KB.
- 3rd June 1953A 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.
- 4th June 1953State the most appropriate data type for storing a person's shoe size if only whole sizes (e.g. 7, 8, 9) are allowed.
- 5th June 1953State the pseudocode operator commonly used to join (concatenate) two strings, then show how it joins 'Rev' and 'ision' to produce 'Revision'.
- 6th June 1953Give one example of an optical secondary storage device.
- 7th June 1953Give two reasons why network communication is divided into layers.
- 8th June 1953State the term used for realistic data that a program would be expected to handle during normal use.
- 9th June 1953Define the term 'primary key' as used in a database table.
- 10th June 1953State the difference between lossy and lossless compression.
- 11th June 1953State the condition that must be met before a binary search can be used on an array.
- 12th June 1953A 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.
- 13th June 1953Convert the 8-bit binary number 10110100 directly to hexadecimal by splitting it into nibbles.
- 14th June 1953Which piece of network hardware connects a LAN to another network such as the internet, directing data packets based on IP address?
- 15th June 1953Explain why an interpreter is often preferred while a program is being written.
- 16th June 1953Convert the denary number 45 to hexadecimal.
- 17th June 1953What does the acronym CPU stand for?
- 18th June 1953State what the term malware means.
- 19th June 1953A 2D array grid is declared as grid[4][6]. State how many rows and columns it has and how many elements it holds in total.
- 20th June 1953An 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).
- 21st June 1953Which of RAM and ROM is volatile, meaning its contents are lost when the power is removed?
- 22nd June 1953Which piece of UK legislation controls how organisations must store and use people's personal data?
- 23rd June 1953Given x = 5 and y = 8, state whether x < y AND x > 0 evaluates to True or False.
- 24th June 1953A 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.
- 25th June 1953Give one reason why RAM on its own is not enough, and a computer also needs secondary storage.
- 26th June 1953State the layer that IP operates in, and describe its job.
- 27th June 1953A password field requires between 6 and 12 characters. State two boundary data values that should be used to test this field.
- 28th June 1953A 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;
- 29th June 1953State one function carried out by the operating system of a computer.
- 30th June 1953In computational thinking, what is meant by the term 'decomposition'?