Olympiad Test: Fundamentals Of Computer - 1 - Class 5 MCQ

A trackball is an input device used to enter motion data into computers or other electronic devices. It serves the same purpose as a mouse, but is designed with a moveable ball on the top, which can be rolled in any direction.

Answer:
Device that emits computer audio audible to everyone:
- Speakers: Speakers are devices that emit audio from a computer or other electronic devices and make it audible to everyone in the vicinity.
- Trackball: Trackball is a pointing device used to move the cursor on a computer screen. It does not emit audio.
- Printer: Printer is a device used to produce hard copies of electronic documents or images. It does not emit audio.
- Magnetic Tape: Magnetic tape is a storage medium used to store data. It does not emit audio.
Therefore, the correct answer is Speakers as they are the devices that emit computer audio audible to everyone.

Answer:
The magnetic device that allows the cursor to be moved by touch with the fingers is called a touchpad. Here is a detailed explanation:
Touchpad:
- A touchpad is a pointing device that is commonly found on laptops and some desktop computers.
- It is a rectangular pad that is sensitive to touch and can be used to control the cursor on the screen.
- The touchpad uses a combination of magnetic sensors and electrical signals to detect the movement of the fingers and translate it into cursor movement.
- It allows users to navigate and interact with the computer without the need for an external mouse.
- The touchpad is typically located below the keyboard, within easy reach of the user's fingers.
- It is operated by sliding or tapping the fingers on the surface of the touchpad.
- The movement and gestures on the touchpad can be customized according to the user's preferences.
- The touchpad also supports multi-touch gestures, allowing users to perform functions such as scrolling, zooming, and rotating.
- It provides a convenient and efficient way to navigate and control the computer without the need for physical buttons or wheels.
In conclusion, a touchpad is the magnetic device that allows the cursor to be moved by touch with the fingers.

Question: A device that converts soft copy to hard copy
Answer: Printer
Explanation:
The device that converts soft copy to hard copy is a printer. Here is a detailed explanation:
Definition:
A printer is an output device that produces a hard copy (physical copy) of electronic documents or images that are stored in soft copy (digital form) on a computer or other digital device.
Working:
When a soft copy is sent to a printer, it follows these steps to convert it into a hard copy:
1. Data Processing: The printer receives the digital data from the computer, which includes text, images, and formatting instructions.
2. Page Description Language (PDL) Conversion: The printer translates the digital data into a language that it can understand, such as PostScript or Printer Command Language (PCL).
3. Rasterization: The printer converts the digital data into a bitmap image, which represents the content of the document or image.
4. Transfer to Paper: The printer transfers the bitmap image onto a physical medium, which is typically a sheet of paper.
5. Ink or Toner Application: The printer applies ink or toner onto the paper to reproduce the content of the digital document or image.
6. Finishing: The printer may perform additional actions, such as duplex printing (printing on both sides of the paper), stapling, or collating, depending on its capabilities.
Types of Printers:
There are various types of printers available, including:
- Inkjet printers: These printers use small nozzles to spray tiny droplets of ink onto the paper.
- Laser printers: These printers use a laser beam to create an electrostatic image on a drum, which attracts toner particles that are transferred onto the paper.
- Dot matrix printers: These printers use a print head with multiple pins to strike an inked ribbon, creating dots that form characters or images.
- Thermal printers: These printers use heat to transfer ink onto the paper, typically used for printing receipts or labels.
Advantages of Printers:
- Produces high-quality output with sharp text and vibrant colors.
- Can print on various sizes and types of paper, including plain paper, photo paper, envelopes, and labels.
- Offers different printing options, such as duplex printing, borderless printing, and poster printing.
- Can be connected to multiple devices, such as computers, smartphones, and tablets, through wired or wireless connections.
In conclusion, a printer is the device that converts soft copy to hard copy by reproducing digital documents or images onto physical paper using ink or toner.

Not a Type of Flat-Screen Display: CRT
CRT (Cathode Ray Tube) is NOT a type of flat-screen display. It is an older technology that is not considered a flat-screen display. The other options, LCD, LED, and Plasma, are all types of flat-screen displays commonly used in modern devices.
Explanation:
- LCD (Liquid Crystal Display): LCD technology uses liquid crystals to display images. It is widely used in various devices such as televisions, computer monitors, and smartphones.
- LED (Light Emitting Diode): LED displays are a type of LCD display that use LED backlights instead of traditional fluorescent lights. LED displays offer better energy efficiency and contrast ratios.
- Plasma: Plasma displays use small cells filled with ionized gas to create images. Although plasma displays were popular in the past, they have been largely replaced by LCD and LED displays due to their lower energy efficiency and higher cost.
- CRT (Cathode Ray Tube): CRT displays use a large glass vacuum tube to display images. While CRT displays were widely used in the past, they are bulky and have been replaced by flat-screen technologies.
In conclusion, CRT is the only option that is not a type of flat-screen display. LCD, LED, and Plasma are all examples of flat-screen display technologies commonly used today.

Unit of measurement for digital camera image resolution
The unit of measurement used to measure digital camera image resolution is megapixels (MP).
Explanation:
- Image resolution refers to the number of pixels contained in an image. It determines the level of detail and clarity in the image.
- Megapixels, abbreviated as MP, represent one million pixels. It is used to quantify the resolution of a digital camera's image sensor.
- The resolution of a digital camera is usually described in terms of the number of megapixels it can capture.
- Higher megapixel counts generally indicate higher image resolution and the ability to capture more detail.
- However, it is important to note that image quality is not solely determined by megapixels. Factors like sensor size, lens quality, and image processing also play a significant role.
- When purchasing a digital camera, the megapixel count is one of the specifications to consider, as it affects the potential print size and the ability to crop images while maintaining good quality.
In conclusion, the unit of measurement used to measure digital camera image resolution is megapixels (MP).