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Input Devices Quiz 19 (10 MCQs)

This set of multiple-choice questions evaluates understanding of input devices, data entry, and basic computer operations. Topics include keyboard function, text input, sound capture, barcode technology, and cursor control. Questions cover key count, standard keyboard configuration, and the role of input devices in computer hardware and automation.

Quiz Instructions

Select an option to see the correct answer instantly.

1. A key-board has at least: (June-2008)

Correct Answer: Correct answer is: (B) 101 keys.

Exam Relevance: Computer Science Exams, IT Certification Exams, Basic Computing Exams

Difficulty: Moderate

Concept notes: A standard keyboard typically has 101 keys, which includes the alphanumeric keys, function keys, navigation keys, and special keys like the Windows key and multimedia controls.

Common Mistakes: A common mistake is to assume that all keyboards have the same number of keys, but the number can vary depending on the manufacturer and model.

Explanations: A standard keyboard configuration includes 101 keys, which covers the full range of alphanumeric keys, function keys, navigation keys, and special keys. This configuration is widely adopted and considered the minimum standard for a full-sized keyboard.

Option Analysis:

Option A: 91 keys is insufficient for a standard keyboard, as it would lack many essential keys.
Option B: 101 keys is the correct number for a standard keyboard configuration.
Option C: 111 keys is more than the standard configuration and would include additional keys that are not typically found on a standard keyboard.
Option D: 121 keys is also more than the standard configuration and would include additional keys that are not typically found on a standard keyboard.

2. We enter text in computer by using:

Correct Answer: Correct answer is: (B) Keyboard.

Exam Relevance: Computer Science Exams, IT Certification Exams, Basic Computer Skills Tests

Difficulty: Easy

Concept notes: The keyboard is an input device used to enter text and commands into a computer.

Common Mistakes: A common mistake is to confuse the mouse with a text input device, as the mouse is primarily used for navigation and selection, not text entry.

Explanations: The keyboard is the primary device used for entering text into a computer. Each key on the keyboard corresponds to a specific character or function, allowing users to type words, numbers, and symbols. The mouse, screen, and other options do not serve the primary function of text entry.

Option Analysis:

Option A: The mouse is used for pointing and clicking, not for entering text.
Option B: The keyboard is the correct device for entering text into a computer.
Option C: The screen is an output device used to display information, not for entering text.
Option D: This option is incorrect as the keyboard is the correct device for text entry.

3. A hand-operated device that allows control of the cursor on a computer screen.

Correct Answer: Correct answer is: (A) Mouse.

Exam Relevance: Computer Science Exams, IT Certification Exams, Basic Computing Exams

Difficulty: Easy

Concept notes: A mouse is an input device that allows users to control the cursor on a computer screen by moving the mouse around.

Common Mistakes: A common mistake is to confuse the mouse with other input devices like the keyboard, which is primarily used for typing text and issuing commands.

Explanations: The mouse is specifically designed to control the cursor on a computer screen. It translates physical movements into digital signals that move the cursor on the screen. This makes it the most appropriate choice for the given description.

Option Analysis:

Option A: Correct. The mouse is the device that allows control of the cursor on a computer screen.
Option B: Incorrect. The keyboard is used for typing and issuing commands, not for controlling the cursor.
Option C: Incorrect. The printer is an output device used for printing documents and images, not for controlling the cursor.
Option D: Incorrect. "Hardware" is a broad term that includes all physical components of a computer, not a specific device for controlling the cursor.

4. Barcode is written in which of the following language?

Correct Answer: Correct answer is: (A) Binary language.

Exam Relevance: Computer Science Exams, Information Technology Exams, Data Processing Exams

Difficulty: Easy

Concept notes: Barcodes are a form of machine-readable data that can be interpreted by scanners. They are typically encoded in binary form, which is a series of 1s and 0s.

Common Mistakes: A common misunderstanding is that barcodes are written in a high-level programming language like HTML or CSS, which are used for web development and not for encoding data in physical formats.

Explanations: Barcodes are encoded using binary language because it is a simple and efficient way to represent data that can be easily read by scanners. The black and white bars in a barcode represent binary digits (1s and 0s), which can be translated into meaningful data by the scanner.

Option Analysis:

Option A: Correct. Barcodes are encoded in binary language.
Option B: Incorrect. HTML is a markup language used for web pages, not for encoding barcodes.
Option C: Incorrect. CSS is a style sheet language used for web design, not for encoding barcodes.
Option D: Incorrect. The correct answer is binary language.

5. A type of input device that can record videos and take pictures.

Correct Answer: Correct answer is: (D) Web Camera.

Exam Relevance: Computer Science Exams, IT Certification Exams, Basic Computing Exams

Difficulty: Easy

Concept notes: A web camera is an input device that can record videos and take pictures.

Common Mistakes: A common misunderstanding is that a web camera is only used for video calls, but it can also take pictures and record videos.

Explanations: A web camera is designed to capture visual data, which can be used for both taking pictures and recording videos. This makes it a versatile input device for capturing visual information.

Option Analysis:

Option A: A keyboard is an input device used for typing text and commands, not for capturing visual data.
Option B: A scanner is an input device used for digitizing physical documents and images, but it does not record videos.
Option C: A mouse is an input device used for controlling the cursor on a screen, not for capturing visual data.
Option D: A web camera is an input device that can record videos and take pictures, making it the correct choice.

6. What type of device could allow a refrigerator to place a replacement order for an item contained within it?

Correct Answer: Correct answer is: (D) Sensor.

Exam Relevance: Computer Science Exams, Engineering Exams, IoT Exams

Difficulty: Moderate

Concept notes: A sensor is an input device that detects or measures a physical property and records, indicates, or otherwise responds to it. In the context of a refrigerator, a sensor could detect when a specific item is running low and trigger an order for a replacement.

Common Mistakes: A common misunderstanding might be that a digital network, generator, or smartphone could directly place an order. However, these devices do not directly detect the physical state of items within the refrigerator.

Explanations: A sensor can detect the presence or absence of items within the refrigerator. When a sensor detects that a specific item is running low, it can send a signal to a connected system to place an order for a replacement. This makes a sensor the most appropriate input device for this task.

Option Analysis:

Option A: A digital network is a system of interconnected devices, but it does not directly detect the physical state of items within the refrigerator.
Option B: A generator produces electrical power and is not an input device that can detect the state of items within the refrigerator.
Option C: A smartphone can be used to place orders, but it does not directly detect the physical state of items within the refrigerator.
Option D: A sensor can detect the presence or absence of items within the refrigerator and trigger an order for a replacement.

7. Which input device detects and records sound?

Correct Answer: Correct answer is: (B) Microphone.

Exam Relevance: Computer Science Exams, IT Certification Exams, Basic Computing Exams

Difficulty: Easy

Concept notes: A microphone is an input device that converts sound waves into electrical signals, which can then be recorded or processed by a computer.

Common Mistakes: A common mistake is confusing a microphone with other input devices like a scanner, which captures images, or a webcam, which captures video.

Explanations: A microphone is specifically designed to detect and record sound. It converts sound waves into electrical signals that can be processed by a computer. Other options like a scanner, touchscreen, and webcam are not designed to capture sound.

Option Analysis:

Option A: A scanner is used to capture images and documents, not sound.
Option B: A microphone is used to detect and record sound.
Option C: A touchscreen is used for input through touch, not for capturing sound.
Option D: A webcam is used to capture video, not sound.

8. Which term is defined as accepting data into the computer via input devices?

Correct Answer: Correct answer is: (C) Input.

Exam Relevance: Computer Science Exams, IT Certification Exams, Basic Computing Skills Tests

Difficulty: Easy

Concept notes: Input refers to the process of entering data into a computer system through input devices such as keyboards, mice, or scanners.

Common Mistakes: A common misunderstanding is confusing input with output, which is the process of retrieving processed data from the computer.

Explanations: Input is the term used to describe the process of accepting data into the computer via input devices. This is a fundamental concept in computer operations, where data is entered into the system for processing.

Option Analysis:

Option A: Data is the raw facts or figures that are entered into the computer, but it does not describe the process of entering it.
Option B: Information is the processed data that is meaningful and useful, but it does not describe the process of entering data into the computer.
Option C: Input is the correct term for the process of accepting data into the computer via input devices.
Option D: Output is the process of retrieving processed data from the computer, not the process of entering data.

9. A peripheral device that allows you to type in information.

Correct Answer: Correct answer is: (C) Keyboard.

Exam Relevance: Computer Science Exams, IT Certification Exams, Basic Computing Skills Tests

Difficulty: Easy

Concept notes: A keyboard is an input device that allows users to type in information into a computer.

Common Mistakes: A common misunderstanding is that a mouse or monitor could be used to type in information, but these devices are not designed for text input.

Explanations: A keyboard is specifically designed to allow users to input text and commands into a computer. It has keys that correspond to letters, numbers, and symbols, making it the primary device for typing information.

Option Analysis:

Option A: A mouse is a pointing device used to control the cursor on a screen, not for typing.
Option B: A monitor is an output device used to display information, not for inputting text.
Option C: A keyboard is the correct input device for typing information into a computer.
Option D: A CPU (Central Processing Unit) is the main component that processes data, not an input device.

10. Which one is not an input device?

Correct Answer: Correct answer is: (C) Speaker.

Exam Relevance: Computer Science Exams, IT Certification Exams, Basic Computing Exams

Difficulty: Easy

Concept notes: An input device is a hardware component that allows users to enter data or commands into a computer. Examples include keyboards, mice, and scanners. A speaker, however, is an output device that converts digital signals into sound for the user to hear.

Common Mistakes: A common mistake is confusing input and output devices. Input devices send data to the computer, while output devices receive data from the computer.

Explanations: A speaker is not an input device because it does not send data to the computer. Instead, it receives data from the computer and converts it into sound. Input devices like keyboards, mice, and scanners are designed to capture user input and send it to the computer for processing.

Option Analysis:

Option A: A keyboard is an input device used to enter text and commands into a computer.
Option B: A mouse is an input device used to control the cursor and interact with graphical user interfaces.
Option C: A speaker is an output device used to produce sound from digital signals.
Option D: A scanner is an input device used to digitize images and documents.

Frequently Asked Questions

What is an input device?

An input device is any hardware component that allows data to be entered into a computer system for processing. Examples include keyboards, mice, and web cameras.

How does a barcode scanner work?

A barcode scanner reads the unique pattern of a barcode and converts it into machine-readable data, which is then processed by the computer system to perform tasks such as inventory tracking or price lookup.

What is the function of a microphone in a computer?

A microphone is an input device that captures sound and converts it into digital data that can be processed by a computer. It is commonly used for voice commands, recording audio, and video conferencing.

What is the standard key count for a keyboard?

A standard keyboard typically has 104 keys, including alphanumeric keys, function keys, and special keys for navigation and system control. The exact number can vary depending on the manufacturer and intended use.

How do sensors function as input devices?

Sensors are input devices that detect changes in the environment and convert these changes into data that can be processed by a computer. They are used in various applications, such as temperature monitoring in refrigerators or motion detection in security systems.

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