Daily Practice · GCSE Computer Science
April 2019 - GCSE Computer Science 5-a-day
Every GCSE Computer Science sheet published in April 2019, with answers. Systems, data representation, networks, algorithms and programming.
Every sheet in April 2019
The same date always regenerates the same five questions, so a sheet you print today is the sheet a classmate prints tomorrow.
- 1st April 2019An 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.
- 2nd April 2019Complete: NOT 0 = ?
- 3rd April 2019Convert the 8-bit binary number 01011010 to denary.
- 4th April 2019State what LAN stands for.
- 5th April 2019A program compiles and runs but always outputs an average that is too small. State the type of error and explain why the translator did not report it.
- 6th April 2019An 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.
- 7th April 2019Which CPU register holds the address of the next instruction to be fetched?
- 8th April 2019Distinguish between the network security threats known as phishing and pharming.
- 9th April 2019An array named temps holds 12 values. State the index of the first item and the index of the last item.
- 10th April 2019A row of pixels is encoded using run-length encoding as: 3W 4B 3W. State the original row of pixels it represents.
- 11th April 2019A photo file is 3.5 MB in size. Calculate its size in kilobytes (KB). Use 1 MB = 1000 KB.
- 12th April 2019A 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.
- 13th April 2019State the most appropriate data type for storing a person's shoe size if only whole sizes (e.g. 7, 8, 9) are allowed.
- 14th April 2019Write the pseudocode header and body for a function called isAdult that takes one integer parameter called age and returns True if age is 18 or over.
- 15th April 2019Give one example of an optical secondary storage device.
- 16th April 2019State the difference between HTTP and HTTPS, and give one situation where HTTPS is essential.
- 17th April 2019State the term used for realistic data that a program would be expected to handle during normal use.
- 18th April 2019State what a foreign key is used for.
- 19th April 2019State the difference between lossy and lossless compression.
- 20th April 2019State the condition that must be met before a binary search can be used on an array.
- 21st April 2019A 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.
- 22nd April 2019A pseudocode algorithm is: count <- 0, x <- 10, WHILE x > 0, count <- count + 1, x <- x - 3, ENDWHILE, OUTPUT count. Complete a trace table for x and count, laid out as x | count, then state the value output.
- 23rd April 2019Which piece of network hardware connects a LAN to another network such as the internet, directing data packets based on IP address?
- 24th April 2019State why a program written in a high level language must be translated.
- 25th April 2019Convert the denary number 45 to hexadecimal.
- 26th April 2019What does the acronym CPU stand for?
- 27th April 2019State what the term malware means.
- 28th April 2019Describe what a nested loop does when it processes a 2D array.
- 29th April 2019An uncompressed file is 6000 KB. After lossless compression it is 1500 KB. Calculate the compression ratio in the form n:1 (original size : compressed size).
- 30th April 2019Which of RAM and ROM is volatile, meaning its contents are lost when the power is removed?