Daily Practice · GCSE Computer Science
February 2017 - GCSE Computer Science 5-a-day
Every GCSE Computer Science sheet published in February 2017, with answers. Systems, data representation, networks, algorithms and programming.
Every sheet in February 2017
The same date always regenerates the same five questions, so a sheet you print today is the sheet a classmate prints tomorrow.
- 1st February 2017A row of pixels is encoded using run-length encoding as: 3W 4B 3W. State the original row of pixels it represents.
- 2nd February 2017A photo file is 3.5 MB in size. Calculate its size in kilobytes (KB). Use 1 MB = 1000 KB.
- 3rd February 2017A 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 February 2017State the most appropriate data type for storing a person's shoe size if only whole sizes (e.g. 7, 8, 9) are allowed.
- 5th February 2017State the pseudocode operator commonly used to join (concatenate) two strings, then show how it joins 'Rev' and 'ision' to produce 'Revision'.
- 6th February 2017Give one example of an optical secondary storage device.
- 7th February 2017State the difference between HTTP and HTTPS, and give one situation where HTTPS is essential.
- 8th February 2017State the term used for realistic data that a program would be expected to handle during normal use.
- 9th February 2017Define the term 'primary key' as used in a database table.
- 10th February 2017State the difference between lossy and lossless compression.
- 11th February 2017State the condition that must be met before a binary search can be used on an array.
- 12th February 2017A 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 February 2017Convert the 8-bit binary number 10110100 directly to hexadecimal by splitting it into nibbles.
- 14th February 2017Which piece of network hardware connects a LAN to another network such as the internet, directing data packets based on IP address?
- 15th February 2017State why a program written in a high level language must be translated.
- 16th February 2017Convert the denary number 45 to hexadecimal.
- 17th February 2017What does the acronym CPU stand for?
- 18th February 2017State what the term malware means.
- 19th February 2017Describe what a nested loop does when it processes a 2D array.
- 20th February 2017An 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 February 2017Which of RAM and ROM is volatile, meaning its contents are lost when the power is removed?
- 22nd February 2017Which piece of UK legislation controls how organisations must store and use people's personal data?
- 23rd February 2017Given x = 5 and y = 8, state whether x < y AND x > 0 evaluates to True or False.
- 24th February 2017A 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 February 2017Give one reason why RAM on its own is not enough, and a computer also needs secondary storage.
- 26th February 2017Give two reasons why network communication is divided into layers.
- 27th February 2017A password field requires between 6 and 12 characters. State two boundary data values that should be used to test this field.
- 28th February 2017A 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;