Q21. Which input device is commonly used for gaming and virtual reality applications?
a) Keyboard
b) Mouse
c) Joystick
d) Printer
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Correct Answer: c) Joystick
Explanation: A joystick is an input device often used for gaming and virtual reality applications. It allows users to control the movement of an object or cursor in a three-dimensional space.
Q22. What type of input device is a barcode reader?
a) Keyboard
b) Mouse
c) Optical Scanner
d) Light Pen
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Correct Answer: c) Optical Scanner
Explanation: A barcode reader is an optical scanner that reads barcodes and converts them into digital data. It is commonly used in retail stores for inventory management and checkout processes.
Q23. Which of the following devices is used to capture live video and audio input?
a) Webcam
b) Microphone
c) Scanner
d) Plotter
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Correct Answer: a) Webcam
Explanation: A webcam is an input device used to capture live video and, in some cases, audio input. It is commonly used for video conferencing, live streaming, and recording videos on a computer.
Q24. What is the primary function of a plotter?
a) To print text documents
b) To scan images
c) To produce high-quality graphics and drawings
d) To store data
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Correct Answer: c) To produce high-quality graphics and drawings
Explanation: A plotter is an output device used to produce high-quality graphics, drawings, and charts, especially in large formats. It is commonly used in engineering, architecture, and graphic design.
Q25. Which output device is used to produce sound from a computer?
a) Monitor
b) Speaker
c) Plotter
d) Printer
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Correct Answer: b) Speaker
Explanation: Speakers are output devices used to produce sound from a computer. They convert digital audio signals into audible sound, allowing users to listen to music, audio alerts, or other audio content.
Q26. What does a digital projector do?
a) It inputs data into a computer
b) It stores data
c) It projects images and videos onto a large screen
d) It processes data
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Correct Answer: c) It projects images and videos onto a large screen
Explanation: A digital projector is an output device that projects images and videos onto a large screen or surface, making it suitable for presentations, movies, and other visual content displays.
Q27. Which of the following is NOT an example of an output device?
a) Monitor
b) Printer
c) Speaker
d) Keyboard
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Correct Answer: d) Keyboard
Explanation: A keyboard is an input device, not an output device. It is used to input data into a computer, whereas monitors, printers, and speakers are used to output data from the computer.
Q28. What is the function of a hard disk drive (HDD)?
a) To input data
b) To process data
c) To store data
d) To display data
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Correct Answer: c) To store data
Explanation: A hard disk drive (HDD) is a storage device used to store data permanently. It holds the operating system, applications, files, and other data, even when the computer is turned off.
Q29. Which device can be used both as an input and output device?
a) Monitor
b) Touchscreen
c) Keyboard
d) Speaker
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Correct Answer: b) Touchscreen
Explanation: A touchscreen is a device that can function both as an input and output device. It displays visual content (output) and allows users to interact with the content by touching the screen (input).
Q30. What type of memory is typically used for the main memory in computers?
a) ROM
b) SSD
c) RAM
d) Flash Drive
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Correct Answer: c) RAM
Explanation: RAM (Random Access Memory) is typically used as the main memory in computers. It is a volatile memory that stores data temporarily while the computer is running, providing fast access to the CPU.