Daily Practice · GCSE Computer Science
February 2021 - GCSE Computer Science 5-a-day
Every GCSE Computer Science sheet published in February 2021, with answers. Systems, data representation, networks, algorithms and programming.
Every sheet in February 2021
The same date always regenerates the same five questions, so a sheet you print today is the sheet a classmate prints tomorrow.
- 1st February 2021State one weakness of a simple shift cipher compared to modern encryption methods used on networks.
- 2nd February 2021An array named temps holds 12 values. State the index of the first item and the index of the last item.
- 3rd February 2021Define the term 'pixel'.
- 4th February 2021Order these from fastest access speed to slowest: RAM, cache, registers, secondary storage.
- 5th February 2021Which piece of UK legislation makes it a criminal offence to gain unauthorised access to a computer system?
- 6th February 2021Evaluate the expression 23 DIV 4.
- 7th February 2021A 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.
- 8th February 2021A 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.
- 9th February 2021State the difference between HTTP and HTTPS, and give one situation where HTTPS is essential.
- 10th February 2021A 'quantity' field on a website must only accept whole numbers from 1 to 10. Which validation check identifies that 15 has been entered?
- 11th February 2021A table called bookings has fields bookingId, customerName and eventDate. Write an SQL statement that deletes the booking with bookingId 45.
- 12th February 2021A row of 8 pixels is WWWBBBWW. Use run-length encoding to encode this row as pairs of (colour, run length).
- 13th February 2021An 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.
- 14th February 2021Complete: NOT 0 = ?
- 15th February 2021Convert the denary number 39 to an 8-bit binary number, showing your working.
- 16th February 2021State what LAN stands for.
- 17th February 2021State why a program written in a high level language must be translated.
- 18th February 2021An 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.
- 19th February 2021Which CPU register holds the address of the next instruction to be fetched?
- 20th February 2021Distinguish between the network security threats known as phishing and pharming.
- 21st February 2021Describe what a nested loop does when it processes a 2D array.
- 22nd February 2021A row of pixels is encoded using run-length encoding as: 3W 4B 3W. State the original row of pixels it represents.
- 23rd February 2021A photo file is 3.5 MB in size. Calculate its size in kilobytes (KB). Use 1 MB = 1000 KB.
- 24th February 2021A 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.
- 25th February 2021State the most appropriate data type for storing a person's shoe size if only whole sizes (e.g. 7, 8, 9) are allowed.
- 26th February 2021Give one specific way this code could be refined without changing what it does: a = 5, b = 3, c = a + b, PRINT c
- 27th February 2021Give one example of an optical secondary storage device.
- 28th February 2021Give two reasons why network communication is divided into layers.