Daily Practice · GCSE Computer Science
June 1970 5-a-day
Every sheet in June 1970
The same date always regenerates the same five questions, so a sheet you print today is the sheet a classmate prints tomorrow.
- 1st June 1970Convert the 4-bit binary number 1101 to denary.
- 2nd June 1970Two CPUs are compared for a task optimised for multiple cores: CPU A has 2 cores at 4.2 GHz; CPU B has 6 cores at 3.0 GHz. Explain which CPU is likely to perform better for this task.
- 3rd June 1970State why an organisation might employ penetration testers to test its network.
- 4th June 1970Explain why a running maximum should be initialised to the first element of the array rather than to 0.
- 5th June 1970State one example of a file format that commonly uses lossy compression.
- 6th June 1970State how many bits are in one byte, and how many bytes are in one kibibyte (KiB).
- 7th June 1970State whether the source code of proprietary (closed source) software is normally available for the public to view.
- 8th June 1970Write one line of pseudocode that converts the string stored in heightInput into a real number and stores it in a variable called height.
- 9th June 1970State the correct order of the three operations used to read data from a text file.
- 10th June 1970Order these units of data from smallest to largest: megabyte, byte, gigabyte, kilobyte.
- 11th June 1970Name the four layers of the TCP/IP model in order from the one closest to the user.
- 12th June 1970Give one example of erroneous test data for a field that only accepts whole numbers from 1 to 10.
- 13th June 1970A table called products has fields productId, name, price and stock. Write an SQL statement that changes the price of the product with productId 7 to 15.99.
- 14th June 1970Each 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.
- 15th June 1970Which flowchart symbol shape is used to represent a decision point (e.g. a yes/no branch)?
- 16th June 1970State the two values a Boolean data type can hold.
- 17th June 1970Convert the denary number 200 to hexadecimal, showing your working.
- 18th June 1970Calculate the number of cables needed to connect 8 computers in a full mesh topology, where every computer connects directly to every other computer.
- 19th June 1970A 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.
- 20th June 1970Convert the hexadecimal number 1A to denary.
- 21st June 1970Convert the denary number 156 to an 8 bit binary number.
- 22nd June 1970Which type of malware can replicate itself and spread across a network without attaching to another program or needing a user to run it?
- 23rd June 1970An array named temps holds 12 values. State the index of the first item and the index of the last item.
- 24th June 1970An image uses a colour depth of 2 bits per pixel. Calculate the maximum number of different colours it can represent.
- 25th June 1970A 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.
- 26th June 1970Describe two negative consequences of throwing away old computer hardware instead of recycling it.
- 27th June 1970Write a function called isEven that takes one integer parameter, num, and returns True if num is even and False otherwise.
- 28th June 1970State the pseudocode operator commonly used to join (concatenate) two strings, then show how it joins 'Rev' and 'ision' to produce 'Revision'.
- 29th June 1970A 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.
- 30th June 1970State the difference between HTTP and HTTPS, and give one situation where HTTPS is essential.