Daily Practice · GCSE Computer Science
June 2011 - GCSE Computer Science 5-a-day
Every GCSE Computer Science sheet published in June 2011, with answers. Systems, data representation, networks, algorithms and programming.
Every sheet in June 2011
The same date always regenerates the same five questions, so a sheet you print today is the sheet a classmate prints tomorrow.
- 1st June 2011Trace this algorithm with data = [4, 9, 2, 9, 7] and state the final output. total = 0; count = 0; for i = 0 to 4: if data[i] > 5 then total = total + data[i] and count = count + 1; next i; print(total, count).
- 2nd June 2011Define the term 'pixel'.
- 3rd June 2011Order these from fastest access speed to slowest: RAM, cache, registers, secondary storage.
- 4th June 2011Which piece of UK legislation makes it a criminal offence to gain unauthorised access to a computer system?
- 5th June 2011Evaluate the expression 23 DIV 4.
- 6th June 2011State the value returned by LENGTH(word) if word stores the string 'Computer'.
- 7th June 2011A 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.
- 8th June 2011Explain the role of TCP when a large file is downloaded.
- 9th June 2011A 'quantity' field on a website must only accept whole numbers from 1 to 10. Which validation check identifies that 15 has been entered?
- 10th June 2011A 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.
- 11th June 2011A row of 8 pixels is WWWBBBWW. Use run-length encoding to encode this row as pairs of (colour, run length).
- 12th June 2011An 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.
- 13th June 2011Complete: NOT 0 = ?
- 14th June 2011State how many different values can be represented using 5 bits, and explain your reasoning.
- 15th June 2011State what LAN stands for.
- 16th June 2011Give one advantage and one disadvantage of using a compiler.
- 17th June 2011An 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.
- 18th June 2011Which CPU register holds the address of the next instruction to be fetched?
- 19th June 2011Distinguish between the network security threats known as phishing and pharming.
- 20th June 2011Write a loop in pseudocode that outputs every element of a 1D array named names of length 6.
- 21st June 2011A row of pixels is encoded using run-length encoding as: 3W 4B 3W. State the original row of pixels it represents.
- 22nd June 2011A photo file is 3.5 MB in size. Calculate its size in kilobytes (KB). Use 1 MB = 1000 KB.
- 23rd June 2011A 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.
- 24th June 2011State the most appropriate data type for storing a person's shoe size if only whole sizes (e.g. 7, 8, 9) are allowed.
- 25th June 2011State the key difference between a procedure and a function.
- 26th June 2011Give one example of an optical secondary storage device.
- 27th June 2011A user reads the same email on a phone and a tablet, and deleting it on one deletes it on the other. Which protocol is in use and why?
- 28th June 2011State the term used for realistic data that a program would be expected to handle during normal use.
- 29th June 2011Give one advantage of a relational database over a flat-file database.
- 30th June 2011State the difference between lossy and lossless compression.