Daily Practice · GCSE Computer Science
April 1979 5-a-day
Every sheet in April 1979
The same date always regenerates the same five questions, so a sheet you print today is the sheet a classmate prints tomorrow.
- 1st April 1979Evaluate X = NOT A AND B when A = 0 and B = 1.
- 2nd April 1979Convert the 8-bit binary number 10110100 directly to hexadecimal by splitting it into nibbles.
- 3rd April 1979Give one advantage of a star topology compared with a mesh topology.
- 4th April 1979State why a program written in a high level language must be translated.
- 5th April 1979Add the 8-bit binary numbers 00101101 and 00010011, giving your answer as an 8-bit binary number.
- 6th April 1979State the three stages of the fetch-decode-execute cycle in the order they occur.
- 7th April 1979State one weakness of a simple shift cipher compared to modern encryption methods used on networks.
- 8th April 1979Describe what a nested loop does when it processes a 2D array.
- 9th April 1979Define the term 'pixel'.
- 10th April 1979Order these from fastest access speed to slowest: RAM, cache, registers, secondary storage.
- 11th April 1979Which piece of UK legislation makes it a criminal offence to gain unauthorised access to a computer system?
- 12th April 1979Evaluate the expression 23 DIV 4.
- 13th April 1979A 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.
- 14th April 1979A 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.
- 15th April 1979Give two reasons why network communication is divided into layers.
- 16th April 1979A 'quantity' field on a website must only accept whole numbers from 1 to 10. Which validation check identifies that 15 has been entered?
- 17th April 1979A 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;
- 18th April 1979A row of 8 pixels is WWWBBBWW. Use run-length encoding to encode this row as pairs of (colour, run length).
- 19th April 1979An 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.
- 20th April 1979Complete: NOT 0 = ?
- 21st April 1979Convert the 8-bit binary number 01011010 to denary.
- 22nd April 1979State what LAN stands for.
- 23rd April 1979Explain why an interpreter is often preferred while a program is being written.
- 24th April 1979An 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.
- 25th April 1979Which CPU register holds the address of the next instruction to be fetched?
- 26th April 1979Distinguish between the network security threats known as phishing and pharming.
- 27th April 1979A 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.
- 28th April 1979A row of pixels is encoded using run-length encoding as: 3W 4B 3W. State the original row of pixels it represents.
- 29th April 1979A photo file is 3.5 MB in size. Calculate its size in kilobytes (KB). Use 1 MB = 1000 KB.
- 30th April 1979A 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.