Daily Practice · GCSE Computer Science
September 2007 - GCSE Computer Science 5-a-day
Every GCSE Computer Science sheet published in September 2007, with answers. Systems, data representation, networks, algorithms and programming.
Every sheet in September 2007
The same date always regenerates the same five questions, so a sheet you print today is the sheet a classmate prints tomorrow.
- 1st September 2007State one weakness of a simple shift cipher compared to modern encryption methods used on networks.
- 2nd September 2007Describe what a nested loop does when it processes a 2D array.
- 3rd September 2007Define the term 'pixel'.
- 4th September 2007Order these from fastest access speed to slowest: RAM, cache, registers, secondary storage.
- 5th September 2007Which piece of UK legislation makes it a criminal offence to gain unauthorised access to a computer system?
- 6th September 2007Evaluate the expression 23 DIV 4.
- 7th September 2007State the value returned by LENGTH(word) if word stores the string 'Computer'.
- 8th September 2007A 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 September 2007Give two reasons why network communication is divided into layers.
- 10th September 2007A 'quantity' field on a website must only accept whole numbers from 1 to 10. Which validation check identifies that 15 has been entered?
- 11th September 2007A table called books has fields bookId, title, authorId and copiesAvailable. Write an SQL statement that selects the title of every book with more than 2 copies available.
- 12th September 2007A row of 8 pixels is WWWBBBWW. Use run-length encoding to encode this row as pairs of (colour, run length).
- 13th September 2007An 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 September 2007Complete: NOT 0 = ?
- 15th September 2007State how many different values can be represented using 5 bits, and explain your reasoning.
- 16th September 2007State what LAN stands for.
- 17th September 2007Explain why an interpreter is often preferred while a program is being written.
- 18th September 2007An 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 September 2007Which CPU register holds the address of the next instruction to be fetched?
- 20th September 2007Distinguish between the network security threats known as phishing and pharming.
- 21st September 2007A 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.
- 22nd September 2007A row of pixels is encoded using run-length encoding as: 3W 4B 3W. State the original row of pixels it represents.
- 23rd September 2007A photo file is 3.5 MB in size. Calculate its size in kilobytes (KB). Use 1 MB = 1000 KB.
- 24th September 2007A 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 September 2007State the most appropriate data type for storing a person's shoe size if only whole sizes (e.g. 7, 8, 9) are allowed.
- 26th September 2007State the key difference between a procedure and a function.
- 27th September 2007Give one example of an optical secondary storage device.
- 28th September 2007State the layer that IP operates in, and describe its job.
- 29th September 2007State the term used for realistic data that a program would be expected to handle during normal use.
- 30th September 2007Give one advantage of a relational database over a flat-file database.