Daily Practice · GCSE Computer Science
March 2020 - GCSE Computer Science 5-a-day
Every GCSE Computer Science sheet published in March 2020, with answers. Systems, data representation, networks, algorithms and programming.
Every sheet in March 2020
The same date always regenerates the same five questions, so a sheet you print today is the sheet a classmate prints tomorrow.
- 1st March 2020Evaluate the expression 23 DIV 4.
- 2nd March 2020State the value returned by LENGTH(word) if word stores the string 'Computer'.
- 3rd March 2020A 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 March 2020Explain the role of TCP when a large file is downloaded.
- 5th March 2020A 'quantity' field on a website must only accept whole numbers from 1 to 10. Which validation check identifies that 15 has been entered?
- 6th March 2020A 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 March 2020A row of 8 pixels is WWWBBBWW. Use run-length encoding to encode this row as pairs of (colour, run length).
- 8th March 2020An 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 March 2020Complete: NOT 0 = ?
- 10th March 2020State how many different values can be represented using 5 bits, and explain your reasoning.
- 11th March 2020State what LAN stands for.
- 12th March 2020Give one advantage and one disadvantage of using a compiler.
- 13th March 2020An 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 March 2020Which CPU register holds the address of the next instruction to be fetched?
- 15th March 2020Distinguish between the network security threats known as phishing and pharming.
- 16th March 2020Write a loop in pseudocode that outputs every element of a 1D array named names of length 6.
- 17th March 2020A row of pixels is encoded using run-length encoding as: 3W 4B 3W. State the original row of pixels it represents.
- 18th March 2020A photo file is 3.5 MB in size. Calculate its size in kilobytes (KB). Use 1 MB = 1000 KB.
- 19th March 2020A 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 March 2020State the most appropriate data type for storing a person's shoe size if only whole sizes (e.g. 7, 8, 9) are allowed.
- 21st March 2020State the key difference between a procedure and a function.
- 22nd March 2020Give one example of an optical secondary storage device.
- 23rd March 2020A 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?
- 24th March 2020State the term used for realistic data that a program would be expected to handle during normal use.
- 25th March 2020Give one advantage of a relational database over a flat-file database.
- 26th March 2020State the difference between lossy and lossless compression.
- 27th March 2020State the condition that must be met before a binary search can be used on an array.
- 28th March 2020A 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 March 2020Convert the hexadecimal number 3F to denary.
- 30th March 2020Which piece of network hardware connects a LAN to another network such as the internet, directing data packets based on IP address?
- 31st March 2020Name the translator used for assembly language and describe how it differs from a compiler.