Daily Practice · GCSE Computer Science
February 1995 - GCSE Computer Science 5-a-day
Every sheet in February 1995
The same date always regenerates the same five questions, so a sheet you print today is the sheet a classmate prints tomorrow.
- 1st February 1995State how many bits are in one byte, and how many bytes are in one kibibyte (KiB).
- 2nd February 1995State whether the source code of proprietary (closed source) software is normally available for the public to view.
- 3rd February 1995Write one line of pseudocode that converts the string stored in heightInput into a real number and stores it in a variable called height.
- 4th February 1995A function is defined as: FUNCTION addTax(price) RETURN price x 1.2 ENDFUNCTION. Another line of code runs: total <- addTax(20) + addTax(30). Trace both function calls and state the final value of total.
- 5th February 1995Order these units of data from smallest to largest: megabyte, byte, gigabyte, kilobyte.
- 6th February 1995A 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?
- 7th February 1995Give one example of erroneous test data for a field that only accepts whole numbers from 1 to 10.
- 8th February 1995A table called staff has fields staffId, name, department and salary, storing these records: staffId | name | department | salary, 1 | Ben | Sales | 24000, 2 | Chloe | IT | 31000, 3 | Dan | Sales | 27000. State which staffId(s) would be returned by: SELECT staffId FROM staff WHERE department = 'Sales' AND salary > 25000;
- 9th February 1995Each 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.
- 10th February 1995Which flowchart symbol shape is used to represent a decision point (e.g. a yes/no branch)?
- 11th February 1995State the two values a Boolean data type can hold.
- 12th February 1995Convert the 8-bit binary number 01011010 to denary.
- 13th February 1995Calculate the number of cables needed to connect 8 computers in a full mesh topology, where every computer connects directly to every other computer.
- 14th February 1995Name the translator used for assembly language and describe how it differs from a compiler.
- 15th February 1995Convert the hexadecimal number 1A to denary.
- 16th February 1995Convert the denary number 156 to an 8 bit binary number.
- 17th February 1995Which type of malware can replicate itself and spread across a network without attaching to another program or needing a user to run it?
- 18th February 1995Explain what happens if a program tries to read index 5 of an array declared with 5 elements.
- 19th February 1995An image uses a colour depth of 2 bits per pixel. Calculate the maximum number of different colours it can represent.
- 20th February 1995A 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.
- 21st February 1995Describe two negative consequences of throwing away old computer hardware instead of recycling it.
- 22nd February 1995Write a function called isEven that takes one integer parameter, num, and returns True if num is even and False otherwise.
- 23rd February 1995Write 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.
- 24th February 1995A 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.
- 25th February 1995Define the term protocol.
- 26th February 1995Explain why iterative testing, carried out throughout development, tends to make errors cheaper to fix than relying only on final testing.
- 27th February 1995State what a foreign key is used for.
- 28th February 1995Define the term 'interrupt' as used to describe a signal received by a CPU.