1 Digital Devices

1 State one benefit of using barcodes in a supermarket. (1)

One benefit of using barcodes in a supermarket is that they make the checkout process faster and more efficient. Scanning barcodes is much quicker than manually entering product information, allowing for faster transaction times and reduced wait times for customers. This can help improve the overall shopping experience and customer satisfaction.

2 State one reason why small, built-in microphones are used in smartphones and laptops. (1)

One reason why small, built-in microphones are used in smartphones and laptops is to enable users to make voice calls or record audio without the need for an external microphone. Built-in microphones are convenient and portable, allowing users to easily communicate or record audio on-the-go.

3 Explain why capacitive touch screens do not work when you are wearing woolen gloves. (1)

Capacitive touch screens do not work when we are wearing woolen gloves because woolen gloves are non-conductor of electricity.

4 State three computer systems that do not use monitors. (2)

Embedded computer systems that are integrated into other devices, such as appliances, cars, or industrial equipment. 

Burglar alarm, a security system that is designed to detect unauthorized entry into a building or area.

Web server, a computer system that is used to host websites and web applications.

5 State two benefits of using laser printers rather than inkjet printers. (2)

Laser printers are generally faster than inkjet printers, especially when it comes to printing large volumes of text documents.

Laser printers often have a lower cost per page than inkjet printers, especially when it comes to printing black and white text documents.

6 State two types of business that use plotters. (2)

Plotters are commonly used by cartographers to produce large-format maps and charts, including topographical maps, navigational charts, and weather maps.

Plotters are also used by a wide range of engineering firms, including civil, mechanical, and electrical engineering firms to produce large-format drawings, such as architectural plans, mechanical diagrams, and electrical schematics.

7 Explain why some 3D printers use biodegradable materials to create models. (3)

Biodegradable materials are used in some 3D printers because they are more environmentally friendly, sustainable, and produce less waste than traditional plastics. They are designed to break down naturally over time and are often made from renewable resources, such as cornstarch or sugarcane.

8 List two sensors used in smartphones. For each one, describe one way in which it is used by the operating system or an app. (4)

An accelerometer is a sensor that measures the acceleration of the device and the orientation of the screen. The operating system or app can use this sensor to determine the orientation of the device and rotate the screen accordingly. This feature is commonly used when switching from portrait to landscape mode while watching videos, playing games or reading an e-book.

An ambient light sensor is a sensor that detects the amount of light in the environment surrounding the device. The operating system or app can use this sensor to automatically adjust the brightness of the screen to suit the ambient lighting conditions. This feature helps to save battery life by reducing the screen brightness in low light conditions and making it easier to read in bright sunlight.

9 Discuss the advantages and disadvantages of using sensors in smart cars. (8)

Smart cars use a variety of sensors to monitor their environment and assist with driving, parking, and safety features. The advantages and disadvantages of using sensors in smart cars are discussed below.

Advantages:

Improved Safety: Sensors in smart cars can detect hazards and obstacles on the road and alert the driver or even take corrective action. For example, sensors can detect when a driver is getting drowsy and alert them to take a break.

Increased Efficiency: Sensors can help optimize fuel consumption and reduce emissions by providing information on traffic patterns and road conditions. This can help drivers avoid traffic and take more efficient routes.

Enhanced Comfort: Sensors can adjust the climate control system, seat position, and other settings to optimize the driving experience for each individual driver.

Improved Navigation: Sensors can provide real-time information on traffic, weather conditions, and road constructions, which can help drivers avoid delays and stay on course.

Disadvantages:

Cost: The cost of installing and maintaining sensors can be expensive. This cost may be passed on to the consumer in the form of higher prices for smart cars.

Reliability: Sensors can malfunction or fail, leading to incorrect readings or false alarms. This could potentially compromise the safety of the driver and passengers.

Privacy Concerns: Smart cars with sensors can collect a lot of data on the driver's behaviour and location. This could raise privacy concerns for some individuals.

Cybersecurity: Smart cars with sensors are vulnerable to hacking and cyber attacks. This could potentially compromise the safety of the driver and passengers.

In conclusion, while sensors in smart cars offer many advantages, such as improved safety, increased efficiency, enhanced comfort, and improved navigation, they also come with some disadvantages such as cost, reliability, privacy concerns, and cybersecurity risks. It is important for car manufacturers to address these concerns and ensure that smart cars with sensors are safe, reliable, and secure for all drivers and passengers.

10 Explain one reason why Blu-ray disks are used to store modern console games. (2)

Blu-ray disks are used to store modern console games because they offer larger storage capacity compared to DVDs, allowing developers to include higher quality graphics and longer gameplay.

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