Daily Practice · GCSE Computer Science
December 2018 - GCSE Computer Science 5-a-day
Every GCSE Computer Science sheet published in December 2018, with answers. Systems, data representation, networks, algorithms and programming.
Every sheet in December 2018
The same date always regenerates the same five questions, so a sheet you print today is the sheet a classmate prints tomorrow.
- 1st December 2018Evaluate the expression 23 DIV 4.
- 2nd December 2018State the value returned by LENGTH(word) if word stores the string 'Computer'.
- 3rd December 2018A 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.
- 4th December 2018State the difference between HTTP and HTTPS, and give one situation where HTTPS is essential.
- 5th December 2018A 'quantity' field on a website must only accept whole numbers from 1 to 10. Which validation check identifies that 15 has been entered?
- 6th December 2018A 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.
- 7th December 2018A row of 8 pixels is WWWBBBWW. Use run-length encoding to encode this row as pairs of (colour, run length).
- 8th December 2018An 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.
- 9th December 2018Complete: NOT 0 = ?
- 10th December 2018State how many different values can be represented using 5 bits, and explain your reasoning.
- 11th December 2018State what LAN stands for.
- 12th December 2018State why a program written in a high level language must be translated.
- 13th December 2018An 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.
- 14th December 2018Which CPU register holds the address of the next instruction to be fetched?
- 15th December 2018Distinguish between the network security threats known as phishing and pharming.
- 16th December 2018Describe what a nested loop does when it processes a 2D array.
- 17th December 2018A row of pixels is encoded using run-length encoding as: 3W 4B 3W. State the original row of pixels it represents.
- 18th December 2018A photo file is 3.5 MB in size. Calculate its size in kilobytes (KB). Use 1 MB = 1000 KB.
- 19th December 2018A 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.
- 20th December 2018State the most appropriate data type for storing a person's shoe size if only whole sizes (e.g. 7, 8, 9) are allowed.
- 21st December 2018State the key difference between a procedure and a function.
- 22nd December 2018Give one example of an optical secondary storage device.
- 23rd December 2018Give two reasons why network communication is divided into layers.
- 24th December 2018State the term used for realistic data that a program would be expected to handle during normal use.
- 25th December 2018Give one advantage of a relational database over a flat-file database.
- 26th December 2018State the difference between lossy and lossless compression.
- 27th December 2018State the condition that must be met before a binary search can be used on an array.
- 28th December 2018A 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.
- 29th December 2018Convert the hexadecimal number 3F to denary.
- 30th December 2018Which piece of network hardware connects a LAN to another network such as the internet, directing data packets based on IP address?
- 31st December 2018Explain why an interpreter is often preferred while a program is being written.