Daily Practice · GCSE Computer Science
August 2013 - GCSE Computer Science 5-a-day
Every GCSE Computer Science sheet published in August 2013, with answers. Systems, data representation, networks, algorithms and programming.
Every sheet in August 2013
The same date always regenerates the same five questions, so a sheet you print today is the sheet a classmate prints tomorrow.
- 1st August 2013Convert the hexadecimal number 3F to denary.
- 2nd August 2013Give one advantage of a star topology compared with a mesh topology.
- 3rd August 2013Describe what syntax highlighting is and how it helps a programmer.
- 4th August 2013Add the 8-bit binary numbers 00101101 and 00010011, giving your answer as an 8-bit binary number.
- 5th August 2013State the three stages of the fetch-decode-execute cycle in the order they occur.
- 6th August 2013State one weakness of a simple shift cipher compared to modern encryption methods used on networks.
- 7th August 2013Trace 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).
- 8th August 2013Define the term 'pixel'.
- 9th August 2013Order these from fastest access speed to slowest: RAM, cache, registers, secondary storage.
- 10th August 2013Which piece of UK legislation makes it a criminal offence to gain unauthorised access to a computer system?
- 11th August 2013Evaluate the expression 23 DIV 4.
- 12th August 2013A programmer wants any syntax error in their program to be reported before the program starts running at all. State whether a compiler or an interpreter behaves this way, and explain why.
- 13th August 2013A 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.
- 14th August 2013Explain the role of TCP when a large file is downloaded.
- 15th August 2013A 'quantity' field on a website must only accept whole numbers from 1 to 10. Which validation check identifies that 15 has been entered?
- 16th August 2013A table called bookings has fields bookingId, customerName and eventDate. Write an SQL statement that deletes the booking with bookingId 45.
- 17th August 2013A row of 8 pixels is WWWBBBWW. Use run-length encoding to encode this row as pairs of (colour, run length).
- 18th August 2013An 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.
- 19th August 2013Complete: NOT 0 = ?
- 20th August 2013Convert the denary number 39 to an 8-bit binary number, showing your working.
- 21st August 2013State what LAN stands for.
- 22nd August 2013Give one advantage and one disadvantage of using a compiler.
- 23rd August 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.
- 24th August 2013Which CPU register holds the address of the next instruction to be fetched?
- 25th August 2013Distinguish between the network security threats known as phishing and pharming.
- 26th August 2013Write a loop in pseudocode that outputs every element of a 1D array named names of length 6.
- 27th August 2013A row of pixels is encoded using run-length encoding as: 3W 4B 3W. State the original row of pixels it represents.
- 28th August 2013A photo file is 3.5 MB in size. Calculate its size in kilobytes (KB). Use 1 MB = 1000 KB.
- 29th August 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.
- 30th August 2013State the most appropriate data type for storing a person's shoe size if only whole sizes (e.g. 7, 8, 9) are allowed.
- 31st August 2013Give one specific way this code could be refined without changing what it does: a = 5, b = 3, c = a + b, PRINT c