Daily Practice · GCSE Computer Science
April 1989 5-a-day
Every sheet in April 1989
The same date always regenerates the same five questions, so a sheet you print today is the sheet a classmate prints tomorrow.
- 1st April 1989State the three stages of the fetch-decode-execute cycle in the order they occur.
- 2nd April 1989State one weakness of a simple shift cipher compared to modern encryption methods used on networks.
- 3rd April 1989Write a loop in pseudocode that outputs every element of a 1D array named names of length 6.
- 4th April 1989Define the term 'pixel'.
- 5th April 1989Order these from fastest access speed to slowest: RAM, cache, registers, secondary storage.
- 6th April 1989Which piece of UK legislation makes it a criminal offence to gain unauthorised access to a computer system?
- 7th April 1989Evaluate the expression 23 DIV 4.
- 8th April 1989A 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.
- 9th April 1989A 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.
- 10th April 1989A 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?
- 11th April 1989A 'quantity' field on a website must only accept whole numbers from 1 to 10. Which validation check identifies that 15 has been entered?
- 12th April 1989A 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;
- 13th April 1989A row of 8 pixels is WWWBBBWW. Use run-length encoding to encode this row as pairs of (colour, run length).
- 14th April 1989An 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.
- 15th April 1989Complete: NOT 0 = ?
- 16th April 1989Convert the 8-bit binary number 01011010 to denary.
- 17th April 1989State what LAN stands for.
- 18th April 1989Name the translator used for assembly language and describe how it differs from a compiler.
- 19th April 1989An 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.
- 20th April 1989Which CPU register holds the address of the next instruction to be fetched?
- 21st April 1989Distinguish between the network security threats known as phishing and pharming.
- 22nd April 1989Explain what happens if a program tries to read index 5 of an array declared with 5 elements.
- 23rd April 1989A row of pixels is encoded using run-length encoding as: 3W 4B 3W. State the original row of pixels it represents.
- 24th April 1989A photo file is 3.5 MB in size. Calculate its size in kilobytes (KB). Use 1 MB = 1000 KB.
- 25th April 1989A 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.
- 26th April 1989State the most appropriate data type for storing a person's shoe size if only whole sizes (e.g. 7, 8, 9) are allowed.
- 27th April 1989Write 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.
- 28th April 1989Give one example of an optical secondary storage device.
- 29th April 1989Define the term protocol.
- 30th April 1989State the term used for realistic data that a program would be expected to handle during normal use.