Daily Practice · GCSE Computer Science
July 2009 - GCSE Computer Science 5-a-day
Every GCSE Computer Science sheet published in July 2009, with answers. Systems, data representation, networks, algorithms and programming.
Every sheet in July 2009
The same date always regenerates the same five questions, so a sheet you print today is the sheet a classmate prints tomorrow.
- 1st July 2009Describe two negative consequences of throwing away old computer hardware instead of recycling it.
- 2nd July 2009Write a function called isEven that takes one integer parameter, num, and returns True if num is even and False otherwise.
- 3rd July 2009Give one specific way this code could be refined without changing what it does: a = 5, b = 3, c = a + b, PRINT c
- 4th July 2009A company backs up its files onto magnetic tape cartridges, each with a capacity of 3 TB. The company needs to back up 20 TB of data. Calculate the minimum number of cartridges needed.
- 5th July 2009Give two reasons why network communication is divided into layers.
- 6th July 2009Explain why iterative testing, carried out throughout development, tends to make errors cheaper to fix than relying only on final testing.
- 7th July 2009A table called members has fields memberId, firstName, lastName and joinYear. Write an SQL statement that adds a new record with memberId 12, firstName 'Priya', lastName 'Shah' and joinYear 2026.
- 8th July 2009Define the term 'interrupt' as used to describe a signal received by a CPU.
- 9th July 2009An array called items contains [12, 45, 7, 30, 19] at indices 0 to 4. Describe how a linear search would locate the value 30, stating the number of comparisons needed.
- 10th July 2009Evaluate X = NOT A AND B when A = 0 and B = 1.
- 11th July 2009Convert the hexadecimal number FF to an 8-bit binary number.
- 12th July 2009Give one advantage of a star topology compared with a mesh topology.
- 13th July 2009Explain why an interpreter is often preferred while a program is being written.
- 14th July 2009Add the 8-bit binary numbers 00101101 and 00010011, giving your answer as an 8-bit binary number.
- 15th July 2009State the three stages of the fetch-decode-execute cycle in the order they occur.
- 16th July 2009State one weakness of a simple shift cipher compared to modern encryption methods used on networks.
- 17th July 2009A 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.
- 18th July 2009Define the term 'pixel'.
- 19th July 2009Order these from fastest access speed to slowest: RAM, cache, registers, secondary storage.
- 20th July 2009Which piece of UK legislation makes it a criminal offence to gain unauthorised access to a computer system?
- 21st July 2009Evaluate the expression 23 DIV 4.
- 22nd July 2009State the correct order of the three operations used to read data from a text file.
- 23rd July 2009A 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.
- 24th July 2009State the layer that IP operates in, and describe its job.
- 25th July 2009A 'quantity' field on a website must only accept whole numbers from 1 to 10. Which validation check identifies that 15 has been entered?
- 26th July 2009A table called products has fields productId, name, price and stock. Write an SQL statement that changes the price of the product with productId 7 to 15.99.
- 27th July 2009A row of 8 pixels is WWWBBBWW. Use run-length encoding to encode this row as pairs of (colour, run length).
- 28th July 2009An 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.
- 29th July 2009Complete: NOT 0 = ?
- 30th July 2009Convert the denary number 200 to hexadecimal, showing your working.
- 31st July 2009State what LAN stands for.