The need for input and output devices questions and answers
Q1. What is meant by a ‘digital device’?
A1. Uses only two signals (‘one and zero’, or ‘on and off’).
Q2. What is meant by an ‘input device’?
A2. Input devices take data in whatever form from the outside world and convert it into a digital format, which can then be used and processed by a computer.
Q3. What is meant by an output device?
A3. Output devices take a computer's digital signals and convert them into a form that can be interpreted by a human.
Q4. How many digits are used in binary? What are they?
A4. There are two digits. These are one and zero.
Q5. Explain why a pen drive is not an input device.
A5. It doesn't take a property from the outside world, convert it into a digital format and then pass it to the CPU for processing.
Q6. Explain why a keyboard is not an output device.
A6. This doesn't receive signals from the CPU, which it then converts into a form people can understand.
Q7. State three examples of input devices.
A7. Keyboard, mouse, trackerball, sensor, graphics tablet etc.
Q8. State three examples of output devices.
A8. Speakers, VDU, headphones etc.
Q9. Define what a sensor is, without using the words 'sensor' or 'sensing' or 'senses' in the answer!
A9. Sensors read physical properties and then pass them to a computer for processing.
Q10. What are other words or phrases (synonyms) for a VDU?
A10. E.g. Monitor, display, screen.