Daily Practice · GCSE Computer Science
September 1956 5-a-day
Every sheet in September 1956
The same date always regenerates the same five questions, so a sheet you print today is the sheet a classmate prints tomorrow.
- 1st September 1956Calculate the maximum number of comparisons required by a binary search on a sorted list of 512 items.
- 2nd September 1956Given P = 0 and Q = 1, state the value of P OR Q.
- 3rd September 1956Convert the hexadecimal number FF to an 8-bit binary number.
- 4th September 1956A network administrator is connecting 10 computers in a server room. Calculate the number of cables needed for a full mesh topology, and state the number needed for a star topology with one central switch.
- 5th September 1956State why a program written in a high level language must be translated.
- 6th September 1956Convert the 4-bit binary number 1101 to denary.
- 7th September 1956Two 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.
- 8th September 1956State why an organisation might employ penetration testers to test its network.
- 9th September 1956Describe what a nested loop does when it processes a 2D array.
- 10th September 1956State one example of a file format that commonly uses lossy compression.
- 11th September 1956State how many bits are in one byte, and how many bytes are in one kibibyte (KiB).
- 12th September 1956State whether the source code of proprietary (closed source) software is normally available for the public to view.
- 13th September 1956Write one line of pseudocode that converts the string stored in heightInput into a real number and stores it in a variable called height.
- 14th September 1956State the correct order of the three operations used to read data from a text file.
- 15th September 1956Order these units of data from smallest to largest: megabyte, byte, gigabyte, kilobyte.
- 16th September 1956Give two reasons why network communication is divided into layers.
- 17th September 1956Give one example of erroneous test data for a field that only accepts whole numbers from 1 to 10.
- 18th September 1956A 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.
- 19th September 1956Each 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.
- 20th September 1956Which flowchart symbol shape is used to represent a decision point (e.g. a yes/no branch)?
- 21st September 1956State the two values a Boolean data type can hold.
- 22nd September 1956Convert the denary number 200 to hexadecimal, showing your working.
- 23rd September 1956Calculate the number of cables needed to connect 8 computers in a full mesh topology, where every computer connects directly to every other computer.
- 24th September 1956Explain why an interpreter is often preferred while a program is being written.
- 25th September 1956Convert the hexadecimal number 1A to denary.
- 26th September 1956Convert the denary number 156 to an 8 bit binary number.
- 27th September 1956Which type of malware can replicate itself and spread across a network without attaching to another program or needing a user to run it?
- 28th September 1956A 2D array grid is declared as grid[4][6]. State how many rows and columns it has and how many elements it holds in total.
- 29th September 1956An image uses a colour depth of 2 bits per pixel. Calculate the maximum number of different colours it can represent.
- 30th September 1956A 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.