Daily Practice · GCSE Computer Science
September 2017 - GCSE Computer Science 5-a-day
Every GCSE Computer Science sheet published in September 2017, with answers. Systems, data representation, networks, algorithms and programming.
Every sheet in September 2017
The same date always regenerates the same five questions, so a sheet you print today is the sheet a classmate prints tomorrow.
- 1st September 2017Evaluate the expression 23 DIV 4.
- 2nd September 2017State the value returned by LENGTH(word) if word stores the string 'Computer'.
- 3rd September 2017A 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 September 2017A 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?
- 5th September 2017A 'quantity' field on a website must only accept whole numbers from 1 to 10. Which validation check identifies that 15 has been entered?
- 6th September 2017A 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 September 2017A row of 8 pixels is WWWBBBWW. Use run-length encoding to encode this row as pairs of (colour, run length).
- 8th September 2017An 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 September 2017Complete: NOT 0 = ?
- 10th September 2017State how many different values can be represented using 5 bits, and explain your reasoning.
- 11th September 2017State what LAN stands for.
- 12th September 2017Name the translator used for assembly language and describe how it differs from a compiler.
- 13th September 2017An 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 September 2017Which CPU register holds the address of the next instruction to be fetched?
- 15th September 2017Distinguish between the network security threats known as phishing and pharming.
- 16th September 2017Explain what happens if a program tries to read index 5 of an array declared with 5 elements.
- 17th September 2017A row of pixels is encoded using run-length encoding as: 3W 4B 3W. State the original row of pixels it represents.
- 18th September 2017A photo file is 3.5 MB in size. Calculate its size in kilobytes (KB). Use 1 MB = 1000 KB.
- 19th September 2017A 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 September 2017State the most appropriate data type for storing a person's shoe size if only whole sizes (e.g. 7, 8, 9) are allowed.
- 21st September 2017State the key difference between a procedure and a function.
- 22nd September 2017Give one example of an optical secondary storage device.
- 23rd September 2017Define the term protocol.
- 24th September 2017State the term used for realistic data that a program would be expected to handle during normal use.
- 25th September 2017Give one advantage of a relational database over a flat-file database.
- 26th September 2017State the difference between lossy and lossless compression.
- 27th September 2017State the condition that must be met before a binary search can be used on an array.
- 28th September 2017A 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 September 2017Convert the hexadecimal number 3F to denary.
- 30th September 2017Which piece of network hardware connects a LAN to another network such as the internet, directing data packets based on IP address?