Unit 2 Flashcards
Q.1 What is an input device?
A.1 Hardware device that sends data to a computer.
Q.2 What is a keyboard?
A.2 Input device used to enter fixed values and characters into the computer.
Q.3 What is a numeric keypad?
A.3 Keyboard with 0 to 9 digits.
Q.4 What is a mouse?
A.4 Hand-held device used with a computer to move the cursor on the screen.
Q.5 What is an optical mouse?
A.5 Emits light and uses optical sensor to detect changes in reflected lights.
Q.6 What is a wireless mouse?
A.6 Mouse not connected to computer by cable but connects to it with radio waves.
Q.7 What is a touchpad?
A.7 Device that allows a person to move cursor on screen with the help of the finger.
Q.8 What is a tracker ball?
A.8 Device to move pointer with the method of moving the ball.
Q.9 What is a remote control?
A.9 Small, handheld devices used to control other devices.
Q.10 What is a joystick?
A.10 Can carry out same tasks as a mouse and control movement.
Q.11 What is a driving wheel?
A.11 Used as input device to simulate driving in driving games.
Q.12 What is a touch screen?
A.12 Display that can be used as both as input and output device.
Q.13 What are magnetic stripe readers?
A.13 Devices used to read a magnetic stripe of a card with data.
Q.14 What is a chip and PIN reader?
A.14 Device used to read data stored in the chip of a credit or debit card.
Q.15 What is RFID (radio frequency identification)?
A.15 Uses radio waves to identify and track special tags attached to objects.
Q.16 What is an RFID tag?
A.16 A tag that uses radio frequency to store and transmit data.
Q.17 What is a unique identifier?
A.17 Characteristic of element found only in a particular item.
Q.18 What is OCR?
A.18 A system that scans a typewritten or printed document and translates it to the computer as data.
Q.19 What is OMR?
A.19 Data marked by humans can be selected and captured then processed by a computer.
Q.20 What is a bar code?
A.20 Set of short parallel lines that transmit data after being scanned.
Q.21 What is a QR scanner?
A.21 Quick scanner application that can be used to scan QR tags and load data.
Q.22 What is a QR code?
A.22 Code stored in a square with different shapes that contain data, URLs, and links.
Q.23 What is an output device?
A.23 Device used to send data from computer to another device.
Q.24 What is a monitor?
A.24 Device that displays the data that is output by a computer or another device.
Q.25 What is a multimedia projector?
A.25 Device that projects images from a computer onto a large surface.
Q.26 What is a resistive touch screen?
A.26 Screen sensitive to pressure from finger.
Q.27 What is a capacitive touch screen?
A.27 Touch screen sensitive to static electricity from the finger.
Q.28 What is a scanner?
A.28 Device that digitizes text, diagrams, and images.
Q.29 What is a hard-copy?
A.29 Document printed on paper.
Q.30 What is a digital camera?
A.30 Produces digital images that can be stored in a computer and displayed on a screen.
Q.31 What is a memory card?
A.31 Type of storage device used for storing data.
Q.32 What is a pixel?
A.32 Individual point of light in a digital image.
Q.33 What is a video camera?
A.33 Camera used to make record of moving pictures.
Q.34 What is a webcam?
A.34 Special category of video camera that has no capacity connected directly to the computer.
Q.35 What is a video-conference?
A.35 Meeting held by people who are talking to each other over the internet.
Q.36 What is a microphone?
A.36 Device that converts sound to analogue electrical signal and input audio.
Q.37 What is a sensor?
A.37 Device that detects and responds to some sort of input from the environment.
Q.38 What is a temperature sensor?
A.38 A device that reads temperature and sends readings to the processor.
Q.39 What is a smartphone sensor?
A.39 Sensor in smartphone to measure movement, rotation, pressure and sensitivity.
Q.40 What is a pressure sensor?
A.40 Device that measure pressure and sends data to processor.
Q.41 What is a light sensor?
A.41 Device that measures light levels and sends it to a processor.
Q.42 What is a light pen?
A.42 Specialized pen that works with CRT monitor.
Q.43 What is a CRT monitor?
A.43 Monitor with cathode ray tube.
Q.44 What is a graphical tablet?
A.44 Input device with a flat pad which the user draws on or points at with a special pen.
Q.45 What is a stylus?
A.45 Pen-shaped instrument that is detected by a touch screen or tablet.
Q.46 What are printers and plotters?
A.46 Devices that produce output onto another material.
Q.47 What is a laser printer?
A.47 Printer that works by using laser to draw required output.
Q.48 What is an inkjet printer?
A.48 Printer that works by squirting ink out of different nozzles to create output on a piece of paper.
Q.49 What is a dot matrix printer?
A.49 Printer that uses a set of pins to press inked ribbon against paper.
Q.50 What is a 3D scanner?
A.50 Device that takes multiple photographs of an object from all sides to replicate the object digitally in 3 dimensions.
Q.51 What is a 3D printer?
A.51 Printer that creates a 3D object by printing layers on top of another.
Q.52 What is a speaker?
A.52 Device that allows a person to hear audio output from a computer.
Q.53 What are headphones?
A.53 Personal speakers only the person using the computer can hear.
Q.54 What is an actuator?
A.54 Device that causes machine or other device to operate.
Q55: What are the categories of input devices?
A55:
1) Manual input device.
2) Direct data entry.
Q56: What does Manual input device mean?
A56: People putting the data inside the computer manually.
Q57: What is the usefulness of Direct data entry?
A57: Enables transfer of data without human intervention.
Q58: What are the advantages of using mice?
A58:
1) Fast input.
2) Easy to use.
Q59: What are the disadvantages of using mice?
A59:
(1) Easily damaged.
(2) Disabilities may make it harder to use.
(3) Excessive use may lead to RSI.
(4) Needs a flat surface.
Q60: What are the advantages of tracker ball over mice?
A60:
(1) Does not need a surface to be moved around on.
(2) Can be built into a computer.
(3) Can be easily used by disabled people.
Q61: What are the advantages of a driving wheel?
A61:
(1) Accurate movement.
(2) Force feedback for better simulation.
Q62: What are the disadvantages of a driving wheel?
A62:
1) Can only be used for one purpose.
2) Components may increase manufacturing costs.
Q63: What are the advantages of a keyboard?
A63:
1) More familiarity.
2) Easy to get used to.
Q64: What are the disadvantages of a keyboard?
A64:
1) Easy to make errors.
2) May be time-consuming without a proper method.
3) Can cause injuries if used for long periods of time.
4) Cannot be used to create diagrams and artwork.
5) Different keyboards may be needed for different countries.
Q65: What are the types of touch screen?
A65:
1) Resistive touch screen: senses pressure applied.
2) Capacitive touch screen: senses static electricity.
Q66: What are the advantages of a touch screen?
A66:
1) Easy to use.
2) Space-saving.
3) Cost-effective for shops and restaurants.
Q67: What are the disadvantages of a touch screen?
A67:
1) Not suitable for large amounts of data.
2) Not accurate for small areas.
3) May cause problems for disabled people.
4) Hygiene problems.
Q68: What is the advantage of a remote control?
A68: It is convenient to use.
Q69: What are the disadvantages of a remote control?
A69: May affect other devices and the signal may also be blocked by other objects.
Q70: What are the implementations of joysticks?
A70:
1) Playing video games.
2) Control aircraft.
3) Control wheelchair.
Q71: What are the advantages of using sensors?
A71:
1) More reliable than human.
2) More accurate readings.
3) Can record information about locations inaccessible to humans.
Q72: What are the disadvantages of using sensors?
A72:
1) Need a constant power supply.
2) Users cannot know if sensors are malfunctioning in a remote area.
Q73: What are the types of sensors?
A73:
1) Smartphone sensors.
2) Pressure sensor.
3) Light sensor.
4) CRT monitor.
Q74: What are the advantages of digital cameras over traditional cameras?
A74:
1) Pictures can be easily seen and deleted quickly if needed.
2) Digital files can be edited.
3) Images can be used in other documents.
Q75: What are the disadvantages of digital cameras over traditional cameras?
A75:
1) Storage device may easily become full.
2) Memory card may get corrupted.
3) Camera may run out of battery.
Q76: What are the advantages of scanning?
A76:
1) Some can produce high-quality images.
2) Hard-copy material can easily be changed.
3) Scan results can be included in a digital file.
4) Scanned images can be changed and edited if needed.
Q77: What are the disadvantages of scanning?
A77:
1) May cause a reduction in quality.
2) Scanned images take up a lot of space.
Q78: What is the function of a light pen?
A78: A pen-like device that allows the user to input diagrams and shapes on the monitor or with the help of a drawing tablet.
Q79: What are the advantages of a light pen and stylus?
A79:
(1) Easy to use.
(2) Accurate positioning.
(3) Designed for hand movement.
(4) Space-saving.
(5) Lightweight.
(6) No moving parts.
Q80: What are the disadvantages of a light pen and stylus?
A80:
(1) Can only be used on some screens.
(2) Impair view of computer screen.
(3) Not good for basic operations.
(4) Expensive.
Q81: What are the advantages of magnetic stripe readers?
A81: 1
(1) Simple to use.
(2) Not expensive.
(3) Entering data is fast.
(4) No data input error.
(5) Data on card can be altered if needed.
(6) Cannot be read by humans.
Q82: What are the disadvantages of magnetic stripe readers?
A82:
(1) Small capacity.
(2) Data can be destroyed by magnetic field.
(3) Criminals can easily obtain card information.
(4) Cards need to be physical.
(5) Easy to duplicate.
(6) Data will be lost if stripe is damaged.
Q83: What are the advantages of a video camera/webcam?
A83:
1) Take moving and still pictures.
2) Record audio.
3) Provide a more realistic record.
Q84: What are the disadvantages of a video camera?
A84:
1) Large file sizes.
2) Expensive software may be needed for editing.
Q85: What are the advantages of chip and pin?
A85:
(1) Secure.
(2) Hard to clone.
(3) Hold more data than magnetic stripes.
(4) Portable.
Q86: What are the disadvantages of chip and pin?
A86:
(1) PIN may be forgotten.
(2) Someone else may see the PIN while being entered.
Q87: What is the advantage of OCR?
A87:
(1) Fast way to enter hard copy.
(2) Avoid typing errors.
(3) Cheaper than having an employee do the same task.
Q88: What are the disadvantages of OCR?
A88: 1) Not always reliable. 2) For 100% accuracy, the information needs to be measured by scratch.
Q89: What are the elements of an RFID reader?
A89:
1) Scanning antenna.
2) Decoder to interpret data.
3) The RFID tag.
Q90: What are the advantages of RFID?
A90:
1) Chips do not need to be precise.
2) Work within a few meters of the scanner.
3) Multiple items can be read at once.
4) Reading and writing both can be done.
5) RFID can be used to track luggage and animals.
Q91: What are the disadvantages of RFID?
A91:
1) Hacker may be able to read sensitive data.
2) May be affected by other electronics close by.
3) RFID has a maximum range of 3 meters.
Q92: What is the information of a barcode reader?
A92:
(1) Country of origin number.
(2) Manufacturer number.
(3) Item number.
(4) Check digit.
Q93: What is the advantage of a barcode reader?
A93:
(1) Saves time.
(2) Quick and easy to get data into the system.
(3) Updates stock control automatically.
(4) Accurate.
Q94: What are the disadvantages of a barcode reader?
A94: 1) Expensive technology. 2) Barcode cannot be damaged.
Q95: What are the advantages of OMR?
A95:
1) Fast data input.
2) More accurate than humans.
Q96: What are the disadvantages of OMR?
A96:
1) Paper needs to be aligned properly.
2) Dirty marks may cause problems.
3) Can only read the marks.
4) Paper jams may occur.
Q97: What is the functionality of OMR?
A97: Software looks for the position of marks on a piece of paper to obtain data.
What is the functionality of remote control?
A remote control has buttons that send out an infrared signal when pressed. This signal sends a code to other devices letting them know what to do.
What is the functionality of RFID reader?
Provides a unique identifier on the object it is attached to after it has been scanned.
Explain the functionality of a QR code.
2 dimensional bar codes that hold data that can include websites, emails, phone numbers, links, etc.
What is the functionality of microphones?
Input sounds into a computer by converting them into digital data. They can be used by disabled people to input data and execute tasks when other input methods are inaccessible for them, cheaper microphones cannot give a true representation of input sounds.
What is the functionality of monitors?
Display the computer’s interface and output of different commands done by the computer.
What is the functionality of OCR reader?
OCR reader compares the shape of each character on a printed copy of a text document and a software can recognize these letters by comparing individual letters that are saved into the software and converts these letters into digital data that can be inserted into a word processing software.
What is the functionality of laser printers?
A laser draws required output onto a drum and puts a positive charge on the areas so that the toner can stick to those areas. This drum is then pressed against a paper and heated so that the ink stays on the paper.
What is the functionality of plotters?
Use pens to draw images used for blueprints and technical designs.
What is the advantage of plotters?
(1) Can draw very accurately.
(2) Can draw on different materials.
What are the disadvantages of plotters?
Take up a lot of space compared to other printers.
What is the functionality of dot matrix printer?
Set of pins press colored ribbons against a piece of paper creating dots which are then used to create required patterns and shapes.
What is the advantage of dot matrix printer?
(1) Can be used in dusty and dirty environments.
(2) Can be used on continuous sheets of paper.
(3) Low printing cost per page.
(4) Reliable and durable.
What is the disadvantage of of dot matrix printer?
(1) Slow.
(2) Noisy.
(3) Poor output quality.
(4) Limited color capabilities.
(5) More expensive than inkjet printers.
What is the functionality of bar code and bar code reader?
Bar codes are short parallel lines contrasting in colors that stand for digits 0 to 9 and then can be read by a barcode reader as a code number by shining a laser at them and reading the reflection. This makes it much faster than a keyboard and more accurate.
What are the types of information found on a barcode reader?
(1) Country of origin number.
(2) Manufacturer number.
(3) Item number.
(4) Check digit.
What are the advantages of a bar code reader?
(1) Saves time.
(2) Quick and easy to get data into system.
(3) Updates stock control automatically.
(4) Accurate.
What are the disadvantages of barcode reader?
(1) Expensive technology.
(2) Barcode cannot be used if damaged.
What are the advantages of laser printers?
(1) Good quality.
(2) Fast.
(2) The ink is not water soluble.
What are the disadvantages of laser printers?
(1) Color reproduction is not as precise as inkjet.
(2) More expensive than inkjet.
(3) Toner is toxic.
What is the functionality of speakers?
Speakers send the output from the connected device as an electrical current through a coil, creating a magnetic field, causing the cone to vibrate, creating sound waves.
What is the functionality of 3D printers?
3D printers are used to produce different types of three dimensional objects like organs, car parts etc.
What is the functionality of touch screens?
Allow users to interact with the operating system and use software without the need for pointing devices.
What are the advantage of QR codes?
(1) Store lots of information.
(2) Can contain different types of data.
(3) Can be read by multiple devices.
(4) QR codes can easily be created.
(5) Quick to read.
(6) Can be used by anyone for anything.
(7) Can be scanned from any direction.
What are the disadvantages of QR codes?
(1) Smartphone with camera required.
(2) General public has low knowledge about QR codes
