Daily Practice · GCSE Computer Science
December 1997 - GCSE Computer Science 5-a-day
Every sheet in December 1997
The same date always regenerates the same five questions, so a sheet you print today is the sheet a classmate prints tomorrow.
- 1st December 1997Each pair from the previous question is stored using 2 bytes. Calculate the compression ratio achieved, given the uncompressed row (1 byte per pixel) uses 8 bytes.
- 2nd December 1997Which flowchart symbol shape is used to represent a decision point (e.g. a yes/no branch)?
- 3rd December 1997State the two values a Boolean data type can hold.
- 4th December 1997Convert the denary number 200 to hexadecimal, showing your working.
- 5th December 1997Calculate the number of cables needed to connect 8 computers in a full mesh topology, where every computer connects directly to every other computer.
- 6th December 1997Describe what syntax highlighting is and how it helps a programmer.
- 7th December 1997Convert the hexadecimal number 1A to denary.
- 8th December 1997Convert the denary number 156 to an 8 bit binary number.
- 9th December 1997Which type of malware can replicate itself and spread across a network without attaching to another program or needing a user to run it?
- 10th December 1997Trace 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).
- 11th December 1997An image uses a colour depth of 2 bits per pixel. Calculate the maximum number of different colours it can represent.
- 12th December 1997A CPU's cache has a hit rate of 80%. During a task the CPU makes 4000 requests for data. Calculate the number of cache hits and cache misses.
- 13th December 1997Describe two negative consequences of throwing away old computer hardware instead of recycling it.
- 14th December 1997Write a function called isEven that takes one integer parameter, num, and returns True if num is even and False otherwise.
- 15th December 1997State the pseudocode operator commonly used to join (concatenate) two strings, then show how it joins 'Rev' and 'ision' to produce 'Revision'.
- 16th December 1997A company backs up its files onto magnetic tape cartridges, each with a capacity of 3 TB. The company needs to back up 20 TB of data. Calculate the minimum number of cartridges needed.
- 17th December 1997Explain the role of TCP when a large file is downloaded.
- 18th December 1997Explain why iterative testing, carried out throughout development, tends to make errors cheaper to fix than relying only on final testing.
- 19th December 1997Define the term 'primary key' as used in a database table.
- 20th December 1997Define the term 'interrupt' as used to describe a signal received by a CPU.
- 21st December 1997An array called items contains [12, 45, 7, 30, 19] at indices 0 to 4. Describe how a linear search would locate the value 30, stating the number of comparisons needed.
- 22nd December 1997Evaluate X = NOT A AND B when A = 0 and B = 1.
- 23rd December 1997Convert the 8-bit binary number 10110100 directly to hexadecimal by splitting it into nibbles.
- 24th December 1997Give one advantage of a star topology compared with a mesh topology.
- 25th December 1997Give one advantage and one disadvantage of using a compiler.
- 26th December 1997Add the 8-bit binary numbers 00101101 and 00010011, giving your answer as an 8-bit binary number.
- 27th December 1997State the three stages of the fetch-decode-execute cycle in the order they occur.
- 28th December 1997State one weakness of a simple shift cipher compared to modern encryption methods used on networks.
- 29th December 1997Write a loop in pseudocode that outputs every element of a 1D array named names of length 6.
- 30th December 1997Define the term 'pixel'.
- 31st December 1997Order these from fastest access speed to slowest: RAM, cache, registers, secondary storage.