Daily Practice · GCSE Computer Science
October 1986 5-a-day
Every sheet in October 1986
The same date always regenerates the same five questions, so a sheet you print today is the sheet a classmate prints tomorrow.
- 1st October 1986Add the 8-bit binary numbers 00101101 and 00010011, giving your answer as an 8-bit binary number.
- 2nd October 1986State the three stages of the fetch-decode-execute cycle in the order they occur.
- 3rd October 1986State one weakness of a simple shift cipher compared to modern encryption methods used on networks.
- 4th October 1986Explain what happens if a program tries to read index 5 of an array declared with 5 elements.
- 5th October 1986Define the term 'pixel'.
- 6th October 1986Order these from fastest access speed to slowest: RAM, cache, registers, secondary storage.
- 7th October 1986Which piece of UK legislation makes it a criminal offence to gain unauthorised access to a computer system?
- 8th October 1986Evaluate the expression 23 DIV 4.
- 9th October 1986A 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.
- 10th October 1986A 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.
- 11th October 1986Define the term protocol.
- 12th October 1986A 'quantity' field on a website must only accept whole numbers from 1 to 10. Which validation check identifies that 15 has been entered?
- 13th October 1986A 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;
- 14th October 1986A row of 8 pixels is WWWBBBWW. Use run-length encoding to encode this row as pairs of (colour, run length).
- 15th October 1986An 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.
- 16th October 1986Complete: NOT 0 = ?
- 17th October 1986Convert the 8-bit binary number 01011010 to denary.
- 18th October 1986State what LAN stands for.
- 19th October 1986Explain the purpose of a breakpoint.
- 20th October 1986An 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.
- 21st October 1986Which CPU register holds the address of the next instruction to be fetched?
- 22nd October 1986Distinguish between the network security threats known as phishing and pharming.
- 23rd October 1986Explain why a running maximum should be initialised to the first element of the array rather than to 0.
- 24th October 1986A row of pixels is encoded using run-length encoding as: 3W 4B 3W. State the original row of pixels it represents.
- 25th October 1986A photo file is 3.5 MB in size. Calculate its size in kilobytes (KB). Use 1 MB = 1000 KB.
- 26th October 1986A 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.
- 27th October 1986State the most appropriate data type for storing a person's shoe size if only whole sizes (e.g. 7, 8, 9) are allowed.
- 28th October 1986Write the pseudocode header and body for a function called isAdult that takes one integer parameter called age and returns True if age is 18 or over.
- 29th October 1986Give one example of an optical secondary storage device.
- 30th October 1986Name the four layers of the TCP/IP model in order from the one closest to the user.
- 31st October 1986State the term used for realistic data that a program would be expected to handle during normal use.