Daily Practice · GCSE Computer Science
April 2017 - GCSE Computer Science 5-a-day
Every GCSE Computer Science sheet published in April 2017, with answers. Systems, data representation, networks, algorithms and programming.
Every sheet in April 2017
The same date always regenerates the same five questions, so a sheet you print today is the sheet a classmate prints tomorrow.
- 1st April 2017State whether the source code of proprietary (closed source) software is normally available for the public to view.
- 2nd April 2017Write one line of pseudocode that converts the string stored in heightInput into a real number and stores it in a variable called height.
- 3rd April 2017State the value returned by LENGTH(word) if word stores the string 'Computer'.
- 4th April 2017Order these units of data from smallest to largest: megabyte, byte, gigabyte, kilobyte.
- 5th April 2017Explain the role of TCP when a large file is downloaded.
- 6th April 2017Give one example of erroneous test data for a field that only accepts whole numbers from 1 to 10.
- 7th April 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.
- 8th April 2017Each pair from the previous question is stored using 2 bytes. Calculate the compression ratio achieved, given the uncompressed row (1 byte per pixel) uses 8 bytes.
- 9th April 2017Which flowchart symbol shape is used to represent a decision point (e.g. a yes/no branch)?
- 10th April 2017State the two values a Boolean data type can hold.
- 11th April 2017State how many different values can be represented using 5 bits, and explain your reasoning.
- 12th April 2017Calculate the number of cables needed to connect 8 computers in a full mesh topology, where every computer connects directly to every other computer.
- 13th April 2017Give one advantage and one disadvantage of using a compiler.
- 14th April 2017Convert the hexadecimal number 1A to denary.
- 15th April 2017Convert the denary number 156 to an 8 bit binary number.
- 16th April 2017Which type of malware can replicate itself and spread across a network without attaching to another program or needing a user to run it?
- 17th April 2017Write a loop in pseudocode that outputs every element of a 1D array named names of length 6.
- 18th April 2017An image uses a colour depth of 2 bits per pixel. Calculate the maximum number of different colours it can represent.
- 19th April 2017A CPU's cache has a hit rate of 80%. During a task the CPU makes 4000 requests for data. Calculate the number of cache hits and cache misses.
- 20th April 2017Describe two negative consequences of throwing away old computer hardware instead of recycling it.
- 21st April 2017Write a function called isEven that takes one integer parameter, num, and returns True if num is even and False otherwise.
- 22nd April 2017State the key difference between a procedure and a function.
- 23rd April 2017A company backs up its files onto magnetic tape cartridges, each with a capacity of 3 TB. The company needs to back up 20 TB of data. Calculate the minimum number of cartridges needed.
- 24th April 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?
- 25th April 2017Explain why iterative testing, carried out throughout development, tends to make errors cheaper to fix than relying only on final testing.
- 26th April 2017Give one advantage of a relational database over a flat-file database.
- 27th April 2017Define the term 'interrupt' as used to describe a signal received by a CPU.
- 28th April 2017An array called items contains [12, 45, 7, 30, 19] at indices 0 to 4. Describe how a linear search would locate the value 30, stating the number of comparisons needed.
- 29th April 2017Evaluate X = NOT A AND B when A = 0 and B = 1.
- 30th April 2017Convert the hexadecimal number 3F to denary.