Daily Practice · GCSE Computer Science
November 2009 - GCSE Computer Science 5-a-day
Every GCSE Computer Science sheet published in November 2009, with answers. Systems, data representation, networks, algorithms and programming.
Every sheet in November 2009
The same date always regenerates the same five questions, so a sheet you print today is the sheet a classmate prints tomorrow.
- 1st November 2009Evaluate X = NOT A AND B when A = 0 and B = 1.
- 2nd November 2009Convert the hexadecimal number 3F to denary.
- 3rd November 2009Give one advantage of a star topology compared with a mesh topology.
- 4th November 2009State why a program written in a high level language must be translated.
- 5th November 2009Add the 8-bit binary numbers 00101101 and 00010011, giving your answer as an 8-bit binary number.
- 6th November 2009State the three stages of the fetch-decode-execute cycle in the order they occur.
- 7th November 2009State one weakness of a simple shift cipher compared to modern encryption methods used on networks.
- 8th November 2009Describe what a nested loop does when it processes a 2D array.
- 9th November 2009Define the term 'pixel'.
- 10th November 2009Order these from fastest access speed to slowest: RAM, cache, registers, secondary storage.
- 11th November 2009Which piece of UK legislation makes it a criminal offence to gain unauthorised access to a computer system?
- 12th November 2009Evaluate the expression 23 DIV 4.
- 13th November 2009A programmer wants any syntax error in their program to be reported before the program starts running at all. State whether a compiler or an interpreter behaves this way, and explain why.
- 14th November 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.
- 15th November 2009Give two reasons why network communication is divided into layers.
- 16th November 2009A 'quantity' field on a website must only accept whole numbers from 1 to 10. Which validation check identifies that 15 has been entered?
- 17th November 2009A table called bookings has fields bookingId, customerName and eventDate. Write an SQL statement that deletes the booking with bookingId 45.
- 18th November 2009A row of 8 pixels is WWWBBBWW. Use run-length encoding to encode this row as pairs of (colour, run length).
- 19th November 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.
- 20th November 2009Complete: NOT 0 = ?
- 21st November 2009Convert the denary number 39 to an 8-bit binary number, showing your working.
- 22nd November 2009State what LAN stands for.
- 23rd November 2009Explain why an interpreter is often preferred while a program is being written.
- 24th November 2009An 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 November 2009Which CPU register holds the address of the next instruction to be fetched?
- 26th November 2009Distinguish between the network security threats known as phishing and pharming.
- 27th November 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.
- 28th November 2009A row of pixels is encoded using run-length encoding as: 3W 4B 3W. State the original row of pixels it represents.
- 29th November 2009A photo file is 3.5 MB in size. Calculate its size in kilobytes (KB). Use 1 MB = 1000 KB.
- 30th November 2009A 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.