State the uses of 3D printers
Describe overtype and insert modes as used in word processors
State two benefits of using computerised traffic control systems.
Explain the functions of the following parts of the CPU
Control Unit; Decodes instruction; Controls the fetching and writing of data;
Arithmetic Logic Unit/ ALU; Executes mathematical instructions; Executes logical instructions; Compares values held in registers;
Clock; Controls the number of instructions carried out each second; allows the CPU to synchronize operations;
State Examples of utility programs
Encryption software
Defragmentation s/w
(Data) compression s/w
Anti-virus / anti-malware s/w
Disk analysis and repair s/w
Auto-update
Firewall
...over a network/external source
A supermarket uses point of sale (POS) terminals at the checkout for scanning barcodes on the products.
(a) State two items of data that are stored on the barcode.
(b) Describe how the computer system checks that the barcode has been read correctly.
(c) State the type of file access that is used to get the price from the central computer.
(d) Explain how the system updates the file when an item has been sold.
(a) State two items of data that are stored on the barcode.
(b) Describe how the computer system checks that the barcode has been read correctly.
(c) State the type of file access that is used to get the price from the central computer.
(d) Explain how the system updates the file when an item has been sold.
Explain why a software developer should be responsible for addressing ergonomic issues in software design.
Responsibilities of the software developer is to ensure that the ergonomics focuses on making software user-friendly, reduces repetitive motions or eyestrain and enables movements of users to promote comfort and efficiency.
Software can be designed with adjustable text sizes and screen brightness settings to prevent eye strain, offering users a way to customise their visual experience for better comfort during prolonged use.
Explain one drawback to a user if the program is distributed as freeware
The user is not allowed to access the source code so, they cannot tailor the software to their needs and they cannot fix any bugs in it
The software is still covered by copyright
The user must get the owner’s permission to do anything beyond using it
Give two reasons why hexadecimal is often used instead of binary in computer
science.