Daily Practice · GCSE Computer Science
May 2013 - GCSE Computer Science 5-a-day
Every GCSE Computer Science sheet published in May 2013, with answers. Systems, data representation, networks, algorithms and programming.
Every sheet in May 2013
The same date always regenerates the same five questions, so a sheet you print today is the sheet a classmate prints tomorrow.
- 1st May 2013An 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.
- 2nd May 2013Which CPU register holds the address of the next instruction to be fetched?
- 3rd May 2013Distinguish between the network security threats known as phishing and pharming.
- 4th May 2013Explain what happens if a program tries to read index 5 of an array declared with 5 elements.
- 5th May 2013A row of pixels is encoded using run-length encoding as: 3W 4B 3W. State the original row of pixels it represents.
- 6th May 2013A photo file is 3.5 MB in size. Calculate its size in kilobytes (KB). Use 1 MB = 1000 KB.
- 7th May 2013A 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.
- 8th May 2013State the most appropriate data type for storing a person's shoe size if only whole sizes (e.g. 7, 8, 9) are allowed.
- 9th May 2013State the pseudocode operator commonly used to join (concatenate) two strings, then show how it joins 'Rev' and 'ision' to produce 'Revision'.
- 10th May 2013Give one example of an optical secondary storage device.
- 11th May 2013Define the term protocol.
- 12th May 2013State the term used for realistic data that a program would be expected to handle during normal use.
- 13th May 2013Define the term 'primary key' as used in a database table.
- 14th May 2013State the difference between lossy and lossless compression.
- 15th May 2013State the condition that must be met before a binary search can be used on an array.
- 16th May 2013A 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.
- 17th May 2013Convert the 8-bit binary number 10110100 directly to hexadecimal by splitting it into nibbles.
- 18th May 2013Which piece of network hardware connects a LAN to another network such as the internet, directing data packets based on IP address?
- 19th May 2013Explain the purpose of a breakpoint.
- 20th May 2013Convert the denary number 45 to hexadecimal.
- 21st May 2013What does the acronym CPU stand for?
- 22nd May 2013State what the term malware means.
- 23rd May 2013Explain why a running maximum should be initialised to the first element of the array rather than to 0.
- 24th May 2013An uncompressed file is 6000 KB. After lossless compression it is 1500 KB. Calculate the compression ratio in the form n:1 (original size : compressed size).
- 25th May 2013Which of RAM and ROM is volatile, meaning its contents are lost when the power is removed?
- 26th May 2013Which piece of UK legislation controls how organisations must store and use people's personal data?
- 27th May 2013Given x = 5 and y = 8, state whether x < y AND x > 0 evaluates to True or False.
- 28th May 2013A function is defined as: FUNCTION addTax(price) RETURN price x 1.2 ENDFUNCTION. Another line of code runs: total <- addTax(20) + addTax(30). Trace both function calls and state the final value of total.
- 29th May 2013Give one reason why RAM on its own is not enough, and a computer also needs secondary storage.
- 30th May 2013Name the four layers of the TCP/IP model in order from the one closest to the user.
- 31st May 2013A password field requires between 6 and 12 characters. State two boundary data values that should be used to test this field.