Daily Practice · GCSE Computer Science
November 2015 - GCSE Computer Science 5-a-day
Every GCSE Computer Science sheet published in November 2015, with answers. Systems, data representation, networks, algorithms and programming.
Every sheet in November 2015
The same date always regenerates the same five questions, so a sheet you print today is the sheet a classmate prints tomorrow.
- 1st November 2015Distinguish between the network security threats known as phishing and pharming.
- 2nd November 2015Write a loop in pseudocode that outputs every element of a 1D array named names of length 6.
- 3rd November 2015A row of pixels is encoded using run-length encoding as: 3W 4B 3W. State the original row of pixels it represents.
- 4th November 2015A photo file is 3.5 MB in size. Calculate its size in kilobytes (KB). Use 1 MB = 1000 KB.
- 5th November 2015A 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.
- 6th November 2015State the most appropriate data type for storing a person's shoe size if only whole sizes (e.g. 7, 8, 9) are allowed.
- 7th November 2015State the pseudocode operator commonly used to join (concatenate) two strings, then show how it joins 'Rev' and 'ision' to produce 'Revision'.
- 8th November 2015Give one example of an optical secondary storage device.
- 9th November 2015A 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?
- 10th November 2015State the term used for realistic data that a program would be expected to handle during normal use.
- 11th November 2015Define the term 'primary key' as used in a database table.
- 12th November 2015State the difference between lossy and lossless compression.
- 13th November 2015State the condition that must be met before a binary search can be used on an array.
- 14th November 2015A 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.
- 15th November 2015Convert the 8-bit binary number 10110100 directly to hexadecimal by splitting it into nibbles.
- 16th November 2015Which piece of network hardware connects a LAN to another network such as the internet, directing data packets based on IP address?
- 17th November 2015Name the translator used for assembly language and describe how it differs from a compiler.
- 18th November 2015Convert the denary number 45 to hexadecimal.
- 19th November 2015What does the acronym CPU stand for?
- 20th November 2015State what the term malware means.
- 21st November 2015Explain what happens if a program tries to read index 5 of an array declared with 5 elements.
- 22nd November 2015An 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).
- 23rd November 2015Which of RAM and ROM is volatile, meaning its contents are lost when the power is removed?
- 24th November 2015Which piece of UK legislation controls how organisations must store and use people's personal data?
- 25th November 2015Given x = 5 and y = 8, state whether x < y AND x > 0 evaluates to True or False.
- 26th November 2015A 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.
- 27th November 2015Give one reason why RAM on its own is not enough, and a computer also needs secondary storage.
- 28th November 2015Define the term protocol.
- 29th November 2015A password field requires between 6 and 12 characters. State two boundary data values that should be used to test this field.
- 30th November 2015A 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;