Daily Practice · GCSE Computer Science
September 2002 - GCSE Computer Science 5-a-day
Every GCSE Computer Science sheet published in September 2002, with answers. Systems, data representation, networks, algorithms and programming.
Every sheet in September 2002
The same date always regenerates the same five questions, so a sheet you print today is the sheet a classmate prints tomorrow.
- 1st September 2002Add the 8-bit binary numbers 00101101 and 00010011, giving your answer as an 8-bit binary number.
- 2nd September 2002State the three stages of the fetch-decode-execute cycle in the order they occur.
- 3rd September 2002State one weakness of a simple shift cipher compared to modern encryption methods used on networks.
- 4th September 2002Trace 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).
- 5th September 2002Define the term 'pixel'.
- 6th September 2002Order these from fastest access speed to slowest: RAM, cache, registers, secondary storage.
- 7th September 2002Which piece of UK legislation makes it a criminal offence to gain unauthorised access to a computer system?
- 8th September 2002Evaluate the expression 23 DIV 4.
- 9th September 2002State the value returned by LENGTH(word) if word stores the string 'Computer'.
- 10th September 2002A 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.
- 11th September 2002Explain the role of TCP when a large file is downloaded.
- 12th September 2002A 'quantity' field on a website must only accept whole numbers from 1 to 10. Which validation check identifies that 15 has been entered?
- 13th September 2002A 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.
- 14th September 2002A row of 8 pixels is WWWBBBWW. Use run-length encoding to encode this row as pairs of (colour, run length).
- 15th September 2002An 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.
- 16th September 2002Complete: NOT 0 = ?
- 17th September 2002State how many different values can be represented using 5 bits, and explain your reasoning.
- 18th September 2002State what LAN stands for.
- 19th September 2002Give one advantage and one disadvantage of using a compiler.
- 20th September 2002An 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.
- 21st September 2002Which CPU register holds the address of the next instruction to be fetched?
- 22nd September 2002Distinguish between the network security threats known as phishing and pharming.
- 23rd September 2002Write a loop in pseudocode that outputs every element of a 1D array named names of length 6.
- 24th September 2002A row of pixels is encoded using run-length encoding as: 3W 4B 3W. State the original row of pixels it represents.
- 25th September 2002A photo file is 3.5 MB in size. Calculate its size in kilobytes (KB). Use 1 MB = 1000 KB.
- 26th September 2002A 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.
- 27th September 2002State the most appropriate data type for storing a person's shoe size if only whole sizes (e.g. 7, 8, 9) are allowed.
- 28th September 2002State the key difference between a procedure and a function.
- 29th September 2002Give one example of an optical secondary storage device.
- 30th September 2002A 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?