Input Devices and storage Quiz

What is a mouse used for in a computer system?

• To type documents

• To move the pointer on the screen

• To print documents

• To store data

Answer explanation

A mouse is primarily used to move the pointer on the screen, allowing users to interact with graphical elements. It does not type, print, or store data.

What is a common feature of most keyboards?

• A numeric keypad

• A touch screen

• A built-in printer

• A wireless connection

Answer explanation

A numeric keypad is a common feature on many keyboards, especially those designed for data entry. It allows for quick input of numbers, making it a standard component in most full-sized keyboards.

What is an advantage of video cameras?

• They can only take still images.

• They provide a less realistic record of an event.

• They can take moving images and not just still ones.

• They cannot record audio.

Answer explanation

An advantage of video cameras is that they can take moving images, allowing for a dynamic and realistic representation of events, unlike still images which capture only a single moment.

What was the primary use of light pens before the development of touch screens?

• To measure temperature

• To select text and draw pictures

• To detect sound

• To control pressure

Answer explanation

Before touch screens, light pens were primarily used to select text and draw pictures on computer screens, allowing users to interact directly with the display in a more intuitive way.

What is the function of an accelerometer inside a smartphone?

• To measure sound levels

• To detect angular rotational velocity and linear velocity

• To control screen brightness

• To measure temperature

Answer explanation

The accelerometer in a smartphone detects angular rotational velocity and linear velocity, enabling features like screen rotation and motion-based gaming. It does not measure sound levels, control brightness, or measure temperature.

What is a practical task for using a spider diagram?

• Write a poem

• Create a presentation

• Conduct an experiment

• Build a model

Answer explanation

A spider diagram is useful for organizing ideas visually, making it ideal for creating a presentation. It helps in structuring content and connecting concepts, which enhances clarity and engagement in presentations.

What is a potential security issue with magnetic stripes?

• They are too expensive to produce.

• Criminals can easily obtain card readers and writers.

• They require complex training to use.

• They cannot be altered.

Answer explanation

The correct choice highlights that criminals can easily obtain card readers and writers, allowing them to clone magnetic stripe cards. This poses a significant security risk, as it facilitates fraud and unauthorized transactions.

Which of the following is NOT an element of RFID?

• Scanning antenna

• Decoder

• Barcode

• RFID tag

Answer explanation

A barcode is not an element of RFID technology. RFID consists of components like scanning antennas, decoders, and RFID tags, which work together for wireless identification, unlike barcodes that require line-of-sight scanning.

How do passive RFID tags transmit their data?

• Using their own battery

• Powered by the reader

• Through solar energy

• Using a barcode

Answer explanation

Passive RFID tags transmit data by being powered by the reader's radio waves. They do not have their own battery, unlike active tags, and do not use solar energy or barcodes for data transmission.

What is a disadvantage of RFID scanning?

• Cannot be affected by other devices

• Can be affected by other electrical devices

• Requires a barcode

• Needs a password

Answer explanation

A disadvantage of RFID scanning is that it can be affected by other electrical devices, which may cause interference and reduce scanning accuracy. This highlights the vulnerability of RFID technology in certain environments.