Daily Practice · GCSE Computer Science
September 1976 5-a-day
Every sheet in September 1976
The same date always regenerates the same five questions, so a sheet you print today is the sheet a classmate prints tomorrow.
- 1st September 1976State one example of a file format that commonly uses lossy compression.
- 2nd September 1976State how many bits are in one byte, and how many bytes are in one kibibyte (KiB).
- 3rd September 1976State whether the source code of proprietary (closed source) software is normally available for the public to view.
- 4th September 1976Write one line of pseudocode that converts the string stored in heightInput into a real number and stores it in a variable called height.
- 5th September 1976State the correct order of the three operations used to read data from a text file.
- 6th September 1976Order these units of data from smallest to largest: megabyte, byte, gigabyte, kilobyte.
- 7th September 1976State the difference between HTTP and HTTPS, and give one situation where HTTPS is essential.
- 8th September 1976Give one example of erroneous test data for a field that only accepts whole numbers from 1 to 10.
- 9th September 1976A 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.
- 10th September 1976Each 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.
- 11th September 1976Which flowchart symbol shape is used to represent a decision point (e.g. a yes/no branch)?
- 12th September 1976State the two values a Boolean data type can hold.
- 13th September 1976Convert the denary number 200 to hexadecimal, showing your working.
- 14th September 1976Calculate the number of cables needed to connect 8 computers in a full mesh topology, where every computer connects directly to every other computer.
- 15th September 1976State why a program written in a high level language must be translated.
- 16th September 1976Convert the hexadecimal number 1A to denary.
- 17th September 1976Convert the denary number 156 to an 8 bit binary number.
- 18th September 1976Which type of malware can replicate itself and spread across a network without attaching to another program or needing a user to run it?
- 19th September 1976Describe what a nested loop does when it processes a 2D array.
- 20th September 1976An image uses a colour depth of 2 bits per pixel. Calculate the maximum number of different colours it can represent.
- 21st September 1976A 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.
- 22nd September 1976Describe two negative consequences of throwing away old computer hardware instead of recycling it.
- 23rd September 1976Write a function called isEven that takes one integer parameter, num, and returns True if num is even and False otherwise.
- 24th September 1976State the pseudocode operator commonly used to join (concatenate) two strings, then show how it joins 'Rev' and 'ision' to produce 'Revision'.
- 25th September 1976A 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.
- 26th September 1976Give two reasons why network communication is divided into layers.
- 27th September 1976Explain why iterative testing, carried out throughout development, tends to make errors cheaper to fix than relying only on final testing.
- 28th September 1976Define the term 'primary key' as used in a database table.
- 29th September 1976Define the term 'interrupt' as used to describe a signal received by a CPU.
- 30th September 1976An 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.