Daily Practice · GCSE Computer Science
August 1999 - GCSE Computer Science 5-a-day
Every GCSE Computer Science sheet published in August 1999, with answers. Systems, data representation, networks, algorithms and programming.
Every sheet in August 1999
The same date always regenerates the same five questions, so a sheet you print today is the sheet a classmate prints tomorrow.
- 1st August 1999A row of 8 pixels is WWWBBBWW. Use run-length encoding to encode this row as pairs of (colour, run length).
- 2nd August 1999An 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.
- 3rd August 1999Complete: NOT 0 = ?
- 4th August 1999Convert the denary number 200 to hexadecimal, showing your working.
- 5th August 1999State what LAN stands for.
- 6th August 1999A program compiles and runs but always outputs an average that is too small. State the type of error and explain why the translator did not report it.
- 7th August 1999An 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.
- 8th August 1999Which CPU register holds the address of the next instruction to be fetched?
- 9th August 1999Distinguish between the network security threats known as phishing and pharming.
- 10th August 1999An array named temps holds 12 values. State the index of the first item and the index of the last item.
- 11th August 1999A row of pixels is encoded using run-length encoding as: 3W 4B 3W. State the original row of pixels it represents.
- 12th August 1999A photo file is 3.5 MB in size. Calculate its size in kilobytes (KB). Use 1 MB = 1000 KB.
- 13th August 1999A 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.
- 14th August 1999State the most appropriate data type for storing a person's shoe size if only whole sizes (e.g. 7, 8, 9) are allowed.
- 15th August 1999State the pseudocode operator commonly used to join (concatenate) two strings, then show how it joins 'Rev' and 'ision' to produce 'Revision'.
- 16th August 1999Give one example of an optical secondary storage device.
- 17th August 1999State the difference between HTTP and HTTPS, and give one situation where HTTPS is essential.
- 18th August 1999State the term used for realistic data that a program would be expected to handle during normal use.
- 19th August 1999Define the term 'primary key' as used in a database table.
- 20th August 1999State the difference between lossy and lossless compression.
- 21st August 1999State the condition that must be met before a binary search can be used on an array.
- 22nd August 1999A 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.
- 23rd August 1999Convert the 8-bit binary number 10110100 directly to hexadecimal by splitting it into nibbles.
- 24th August 1999Which piece of network hardware connects a LAN to another network such as the internet, directing data packets based on IP address?
- 25th August 1999State why a program written in a high level language must be translated.
- 26th August 1999Convert the denary number 45 to hexadecimal.
- 27th August 1999What does the acronym CPU stand for?
- 28th August 1999State what the term malware means.
- 29th August 1999Describe what a nested loop does when it processes a 2D array.
- 30th August 1999An 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).
- 31st August 1999Which of RAM and ROM is volatile, meaning its contents are lost when the power is removed?