Daily Practice · GCSE Computer Science
February 1972 5-a-day
Every sheet in February 1972
The same date always regenerates the same five questions, so a sheet you print today is the sheet a classmate prints tomorrow.
- 1st February 1972State one weakness of a simple shift cipher compared to modern encryption methods used on networks.
- 2nd February 1972Trace 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).
- 3rd February 1972Define the term 'pixel'.
- 4th February 1972Order these from fastest access speed to slowest: RAM, cache, registers, secondary storage.
- 5th February 1972Which piece of UK legislation makes it a criminal offence to gain unauthorised access to a computer system?
- 6th February 1972Evaluate the expression 23 DIV 4.
- 7th February 1972State the correct order of the three operations used to read data from a text file.
- 8th February 1972A 1 TB hard disk drive costs 40 pounds. A 500 GB solid-state drive costs 60 pounds. Calculate the cost per gigabyte of each device, and state which is cheaper per GB. Use 1 TB = 1000 GB.
- 9th February 1972Explain the role of TCP when a large file is downloaded.
- 10th February 1972A 'quantity' field on a website must only accept whole numbers from 1 to 10. Which validation check identifies that 15 has been entered?
- 11th February 1972A table called products has fields productId, name, price and stock. Write an SQL statement that changes the price of the product with productId 7 to 15.99.
- 12th February 1972A row of 8 pixels is WWWBBBWW. Use run-length encoding to encode this row as pairs of (colour, run length).
- 13th February 1972An array contains [9, 2, 6], to be sorted using insertion sort. Show the state of the array after each new element has been inserted into its correct position.
- 14th February 1972Complete: NOT 0 = ?
- 15th February 1972Convert the denary number 200 to hexadecimal, showing your working.
- 16th February 1972State what LAN stands for.
- 17th February 1972Give one advantage and one disadvantage of using a compiler.
- 18th February 1972An 8-bit register stores the value 01100000 (denary 96). State the resulting 8-bit binary value after a left shift by 1 place, and state whether an overflow occurs.
- 19th February 1972Which CPU register holds the address of the next instruction to be fetched?
- 20th February 1972Distinguish between the network security threats known as phishing and pharming.
- 21st February 1972Write a loop in pseudocode that outputs every element of a 1D array named names of length 6.
- 22nd February 1972A row of pixels is encoded using run-length encoding as: 3W 4B 3W. State the original row of pixels it represents.
- 23rd February 1972A photo file is 3.5 MB in size. Calculate its size in kilobytes (KB). Use 1 MB = 1000 KB.
- 24th February 1972A 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.
- 25th February 1972State the most appropriate data type for storing a person's shoe size if only whole sizes (e.g. 7, 8, 9) are allowed.
- 26th February 1972State the pseudocode operator commonly used to join (concatenate) two strings, then show how it joins 'Rev' and 'ision' to produce 'Revision'.
- 27th February 1972Give one example of an optical secondary storage device.
- 28th February 1972A 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?
- 29th February 1972State the term used for realistic data that a program would be expected to handle during normal use.