Daily Practice · GCSE Computer Science
March 2015 - GCSE Computer Science 5-a-day
Every GCSE Computer Science sheet published in March 2015, with answers. Systems, data representation, networks, algorithms and programming.
Every sheet in March 2015
The same date always regenerates the same five questions, so a sheet you print today is the sheet a classmate prints tomorrow.
- 1st March 2015Define the term 'pixel'.
- 2nd March 2015Order these from fastest access speed to slowest: RAM, cache, registers, secondary storage.
- 3rd March 2015Which piece of UK legislation makes it a criminal offence to gain unauthorised access to a computer system?
- 4th March 2015Evaluate the expression 23 DIV 4.
- 5th March 2015State the value returned by LENGTH(word) if word stores the string 'Computer'.
- 6th March 2015A 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.
- 7th March 2015Define the term protocol.
- 8th March 2015A 'quantity' field on a website must only accept whole numbers from 1 to 10. Which validation check identifies that 15 has been entered?
- 9th March 2015A 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.
- 10th March 2015A row of 8 pixels is WWWBBBWW. Use run-length encoding to encode this row as pairs of (colour, run length).
- 11th March 2015An 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.
- 12th March 2015Complete: NOT 0 = ?
- 13th March 2015State how many different values can be represented using 5 bits, and explain your reasoning.
- 14th March 2015State what LAN stands for.
- 15th March 2015Explain the purpose of a breakpoint.
- 16th March 2015An 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.
- 17th March 2015Which CPU register holds the address of the next instruction to be fetched?
- 18th March 2015Distinguish between the network security threats known as phishing and pharming.
- 19th March 2015Explain why a running maximum should be initialised to the first element of the array rather than to 0.
- 20th March 2015A row of pixels is encoded using run-length encoding as: 3W 4B 3W. State the original row of pixels it represents.
- 21st March 2015A photo file is 3.5 MB in size. Calculate its size in kilobytes (KB). Use 1 MB = 1000 KB.
- 22nd March 2015A 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.
- 23rd March 2015State the most appropriate data type for storing a person's shoe size if only whole sizes (e.g. 7, 8, 9) are allowed.
- 24th March 2015State the key difference between a procedure and a function.
- 25th March 2015Give one example of an optical secondary storage device.
- 26th March 2015Name the four layers of the TCP/IP model in order from the one closest to the user.
- 27th March 2015State the term used for realistic data that a program would be expected to handle during normal use.
- 28th March 2015Give one advantage of a relational database over a flat-file database.
- 29th March 2015State the difference between lossy and lossless compression.
- 30th March 2015State the condition that must be met before a binary search can be used on an array.
- 31st March 2015A logic circuit has inputs C and D. C feeds into a NOT gate; the output of the NOT gate and D feed into an OR gate, giving output Y. Write the Boolean expression for Y and state its value when C = 1 and D = 0.