Daily Practice · GCSE Computer Science
October 1987 5-a-day
Every sheet in October 1987
The same date always regenerates the same five questions, so a sheet you print today is the sheet a classmate prints tomorrow.
- 1st October 1987A row of pixels is encoded using run-length encoding as: 3W 4B 3W. State the original row of pixels it represents.
- 2nd October 1987A photo file is 3.5 MB in size. Calculate its size in kilobytes (KB). Use 1 MB = 1000 KB.
- 3rd October 1987A 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 October 1987State the most appropriate data type for storing a person's shoe size if only whole sizes (e.g. 7, 8, 9) are allowed.
- 5th October 1987State the key difference between a procedure and a function.
- 6th October 1987Give one example of an optical secondary storage device.
- 7th October 1987Explain the role of TCP when a large file is downloaded.
- 8th October 1987State the term used for realistic data that a program would be expected to handle during normal use.
- 9th October 1987Give one advantage of a relational database over a flat-file database.
- 10th October 1987State the difference between lossy and lossless compression.
- 11th October 1987State the condition that must be met before a binary search can be used on an array.
- 12th October 1987A 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 October 1987Convert the hexadecimal number 3F to denary.
- 14th October 1987Which piece of network hardware connects a LAN to another network such as the internet, directing data packets based on IP address?
- 15th October 1987Give one advantage and one disadvantage of using a compiler.
- 16th October 1987Convert the denary number 45 to hexadecimal.
- 17th October 1987What does the acronym CPU stand for?
- 18th October 1987State what the term malware means.
- 19th October 1987Write a loop in pseudocode that outputs every element of a 1D array named names of length 6.
- 20th October 1987An 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 October 1987Which of RAM and ROM is volatile, meaning its contents are lost when the power is removed?
- 22nd October 1987Which piece of UK legislation controls how organisations must store and use people's personal data?
- 23rd October 1987Given x = 5 and y = 8, state whether x < y AND x > 0 evaluates to True or False.
- 24th October 1987A programmer wants any syntax error in their program to be reported before the program starts running at all. State whether a compiler or an interpreter behaves this way, and explain why.
- 25th October 1987Give one reason why RAM on its own is not enough, and a computer also needs secondary storage.
- 26th October 1987A 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?
- 27th October 1987A password field requires between 6 and 12 characters. State two boundary data values that should be used to test this field.
- 28th October 1987A table called bookings has fields bookingId, customerName and eventDate. Write an SQL statement that deletes the booking with bookingId 45.
- 29th October 1987State one function carried out by the operating system of a computer.
- 30th October 1987In computational thinking, what is meant by the term 'decomposition'?
- 31st October 1987Given A = 1 and B = 1, state the value of A AND B.