Daily Practice · GCSE Computer Science
July 1990 5-a-day
Every sheet in July 1990
The same date always regenerates the same five questions, so a sheet you print today is the sheet a classmate prints tomorrow.
- 1st July 1990State the three stages of the fetch-decode-execute cycle in the order they occur.
- 2nd July 1990State one weakness of a simple shift cipher compared to modern encryption methods used on networks.
- 3rd July 1990An array named temps holds 12 values. State the index of the first item and the index of the last item.
- 4th July 1990Define the term 'pixel'.
- 5th July 1990Order these from fastest access speed to slowest: RAM, cache, registers, secondary storage.
- 6th July 1990Which piece of UK legislation makes it a criminal offence to gain unauthorised access to a computer system?
- 7th July 1990Evaluate the expression 23 DIV 4.
- 8th July 1990A 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 July 1990A 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 July 1990State the difference between HTTP and HTTPS, and give one situation where HTTPS is essential.
- 11th July 1990A 'quantity' field on a website must only accept whole numbers from 1 to 10. Which validation check identifies that 15 has been entered?
- 12th July 1990A 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 July 1990A row of 8 pixels is WWWBBBWW. Use run-length encoding to encode this row as pairs of (colour, run length).
- 14th July 1990An 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 July 1990Complete: NOT 0 = ?
- 16th July 1990Convert the 8-bit binary number 01011010 to denary.
- 17th July 1990State what LAN stands for.
- 18th July 1990State why a program written in a high level language must be translated.
- 19th July 1990An 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 July 1990Which CPU register holds the address of the next instruction to be fetched?
- 21st July 1990Distinguish between the network security threats known as phishing and pharming.
- 22nd July 1990Describe what a nested loop does when it processes a 2D array.
- 23rd July 1990A row of pixels is encoded using run-length encoding as: 3W 4B 3W. State the original row of pixels it represents.
- 24th July 1990A photo file is 3.5 MB in size. Calculate its size in kilobytes (KB). Use 1 MB = 1000 KB.
- 25th July 1990A 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 July 1990State the most appropriate data type for storing a person's shoe size if only whole sizes (e.g. 7, 8, 9) are allowed.
- 27th July 1990Write 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 July 1990Give one example of an optical secondary storage device.
- 29th July 1990Give two reasons why network communication is divided into layers.
- 30th July 1990State the term used for realistic data that a program would be expected to handle during normal use.
- 31st July 1990State what a foreign key is used for.