Daily Practice · GCSE Computer Science
July 1981 5-a-day
Every sheet in July 1981
The same date always regenerates the same five questions, so a sheet you print today is the sheet a classmate prints tomorrow.
- 1st July 1981Which CPU register holds the address of the next instruction to be fetched?
- 2nd July 1981Distinguish between the network security threats known as phishing and pharming.
- 3rd July 1981A 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.
- 4th July 1981A row of pixels is encoded using run-length encoding as: 3W 4B 3W. State the original row of pixels it represents.
- 5th July 1981A photo file is 3.5 MB in size. Calculate its size in kilobytes (KB). Use 1 MB = 1000 KB.
- 6th July 1981A 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.
- 7th July 1981State the most appropriate data type for storing a person's shoe size if only whole sizes (e.g. 7, 8, 9) are allowed.
- 8th July 1981State the key difference between a procedure and a function.
- 9th July 1981Give one example of an optical secondary storage device.
- 10th July 1981State the layer that IP operates in, and describe its job.
- 11th July 1981State the term used for realistic data that a program would be expected to handle during normal use.
- 12th July 1981Give one advantage of a relational database over a flat-file database.
- 13th July 1981State the difference between lossy and lossless compression.
- 14th July 1981State the condition that must be met before a binary search can be used on an array.
- 15th July 1981A 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.
- 16th July 1981Convert the hexadecimal number 3F to denary.
- 17th July 1981Which piece of network hardware connects a LAN to another network such as the internet, directing data packets based on IP address?
- 18th July 1981Describe what syntax highlighting is and how it helps a programmer.
- 19th July 1981Convert the denary number 45 to hexadecimal.
- 20th July 1981What does the acronym CPU stand for?
- 21st July 1981State what the term malware means.
- 22nd July 1981Trace this algorithm with data = [4, 9, 2, 9, 7] and state the final output. total = 0; count = 0; for i = 0 to 4: if data[i] > 5 then total = total + data[i] and count = count + 1; next i; print(total, count).
- 23rd July 1981An 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).
- 24th July 1981Which of RAM and ROM is volatile, meaning its contents are lost when the power is removed?
- 25th July 1981Which piece of UK legislation controls how organisations must store and use people's personal data?
- 26th July 1981Given x = 5 and y = 8, state whether x < y AND x > 0 evaluates to True or False.
- 27th July 1981A 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.
- 28th July 1981Give one reason why RAM on its own is not enough, and a computer also needs secondary storage.
- 29th July 1981Explain the role of TCP when a large file is downloaded.
- 30th July 1981A password field requires between 6 and 12 characters. State two boundary data values that should be used to test this field.
- 31st July 1981A table called bookings has fields bookingId, customerName and eventDate. Write an SQL statement that deletes the booking with bookingId 45.