11-2-4- ইনপুট আউটপুট ইউনিট (৬৭-৭২)

Dot matrix printers use a print head with tiny pins to strike an ink ribbon, creating a pattern of dots on the paper to form characters and images. While not as common as they once were, they are still used in some applications because of their durability and ability to make multiple copies at once.

The speed of a dot matrix printer is measured in characters per second (cps). Characters per second (cps) is a unit of measure used to describe the speed of dot-matrix and daisy-wheel printers. It is the number of characters that a printer can print in one second. The higher the cps, the faster the printer.

Duel Core is not a type of computer printer. Other options: ppm (pages per minute) is a unit of measure used to describe the speed of a printer. It is the number of pages that a printer can print in one minute. Dot Matrix printers use a print head with tiny pins to strike an ink ribbon, creating a pattern of dots on the paper to form characters and images. Laser printers use a laser beam to create an image on a drum, which is then transferred to paper using toner. Duel Core is a type of processor that has two cores. It is not a type of printe

You are correct! Line printer is not usually used in an office setting anymore. Line printers were once common in offices for high-volume printing tasks, especially for reports and continuous forms. However, they have largely been replaced by faster and more versatile printers like laser and inkjet printers.

Ink-jet printers spray ink onto paper. Laser printers use a laser beam to create an image on a drum, which is then transferred to paper using toner. Dot matrix printers use a print head with tiny pins to strike an ink ribbon, creating a pattern of dots on the paper to form characters and images.

The correct answer is page printers. Laser printers are known as page printers because they print an entire page at once, rather than printing one line at a time like line printers. They are also known as electrophotographic printers because they use a process called electrophotography to create an image on paper.

সবচেয়ে দ্রুতগতিতে উন্নতমানের প্রিন্ট প্রদানে সক্ষম প্রিন্টার হল লেজার প্রিন্টার। কারণ: দ্রুত গতি: লেজার প্রিন্টার ইনকজেট প্রিন্টারের তুলনায় অনেক দ্রুত প্রিন্ট করতে পারে। লেজার প্রিন্টার প্রতি মিনিটে 12 থেকে 30 পৃষ্ঠা প্রিন্ট করতে পারে, যেখানে ইনকজেট প্রিন্টার প্রতি মিনিটে 4 থেকে 12 পৃষ্ঠা প্রিন্ট করতে পারে। উন্নতমানের প্রিন্ট: লেজার প্রিন্টার ইনকজেট প্রিন্টারের তুলনায় উন্নতমানের প্রিন্ট প্রদান করে। লেজার প্রিন্টারের টেক্সট এবং গ্রাফিক্স আরও স্পষ্ট এবং ধারালো হয়। কার্যক্ষমতা: লেজার প্রিন্টার ইনকজেট প্রিন্টারের তুলনায় বেশি কার্যকর। লেজার প্রিন্টারের টোনার কার্টিজ ইনকজেট প্রিন্টারের কার্তুজের তুলনায় অনেক বেশি পৃষ্ঠা প্রিন্ট করতে পারে।

উইন্ডোজ অপারেটিং সিস্টেমে ওয়ার্ড ডকুমেন্ট প্রিন্ট দিতে ব্যবহৃত শর্টকার্ট কী হল Ctrl + P।

You are correct! A Plotter doesn't use scanning as a first step in its working principle. Plotter: A plotter is a type of printer that uses pens or other drawing instruments to create vector graphics on paper or other media. It translates digital instructions from a computer program into physical drawings. Unlike scanners, plotters don't need to scan an existing image; they work based on the vector data received. OCR (Optical Character Recognition): OCR scanners use light to capture an image of text, then convert that image into editable text. Scanning is the first step for OCR. MICR (Magnetic Ink Character Recognition): Similar to OCR, MICR scanners use light to capture images of special characters printed with magnetic ink, used primarily for checks. Scanning is the initial step. Bar Code Reader: Bar code readers use a light source to scan the barcode and decode the data encoded in the bars and spaces of the code. Scanning is crucial for their function.

You are correct! A Touch screen is both an input and output device. Keyboard and Printer are classic examples of separate input and output devices, respectively. Keyboards allow you to input data, while printers provide output in the form of physical copies. OMR (Optical Mark Recognition) scanners are input devices that read marks made on special forms. They don't provide any output themselves. Touch screens function as both input and output devices. You can use your finger or a stylus to provide input (taps, swipes, etc.) on the touch screen, and it visually responds (displays information, menus, etc.), acting as the output.

You are correct! A Modem works as both an output and input device. Modem (Modulator-Demodulator): It converts digital signals from your computer into analog signals for transmission over phone lines or cables, and vice versa. It acts as both input (receiving analog signals) and output (transmitting digital signals). Mouse and Keyboard are primarily input devices. You use them to provide instructions and data to your computer. Scanner is an input device that captures images or documents and translates them into digital data for the computer.

The speed of a Laser Printer is measured in PPM (Pages Per Minute). LPM (Lines Per Minute): This unit is sometimes used for older printers, especially line printers, which print one line of text at a time. It's not common for laser printers. DPI (Dots Per Inch): This refers to the resolution of a printer, indicating how many dots it can print per inch. Higher DPI means sharper and more detailed prints, but it doesn't directly relate to speed. DPS (Data Processing Speed): This term is not typically used for printer specifications. It might refer to the general processing power of a computer or device.

The output quality of a printer is measured by Dots Per Inch (DPI). Dot per sq. inch isn't commonly used for printer output quality. It could be relevant in other contexts, like measuring the density of objects. Dots printed per unit time refers to the printer's speed, not the quality of the output. All of the above is incorrect because DPI is the primary measure, while the others don't directly reflect output quality.

You are correct! A Scanner is not an output device. Printer and Flat Screen are both output devices. Printers produce physical copies of digital data, while flat screens display visual information processed by the computer. Touch screens can be a bit more ambiguous, but in this context, they primarily function as output devices. While you can use touch gestures for input, the screen itself displays the information, making it an output device. Scanners, on the other hand, are input devices. They take physical documents or images and convert them into a digital format that the computer can understand.

You are correct! A Pixel is the smallest resolvable part of a picture. A computer program that draws pictures is more like a graphics software or a drawing application. A picture stored in secondary memory refers to the entire image file, composed of many pixels. The smallest resolvable part of a picture is the most accurate definition of a pixel. Pixels are like tiny squares or dots that come together to form the complete image you see on a screen.

You are correct! A single point on a computer screen is called a Pixel. Cell can be used in different contexts like spreadsheets, but it doesn't refer to a single point on a screen. Element can refer to HTML elements that make up a webpage, but it's not the specific term for a single screen point. Bit is the smallest unit of information in a computer, representing a 0 or 1. While a group of bits can contribute to the color and information displayed by a pixel, it's not the pixel itself.

The computer stores its program and data in Memory. While all the options you mentioned play a role in processing information, memory is the primary storage location for both programs and data. ALU (Arithmetic Logic Unit): Performs arithmetic and logical operations on data as instructed by the program. Control Unit: Fetches instructions from memory, decodes them, and controls the overall flow of data through the computer. Cache Memory: A small, high-speed memory that stores frequently accessed data and instructions from main memory for faster retrieval by the processor. It acts as a temporary storage and doesn't hold everything permanently. Memory (Main Memory): This is the main storage area of the computer where programs and data are held while the computer is running. It's faster than secondary storage devices (like hard drives) but is volatile, meaning data is lost when the computer is turned off.

You are correct! The Memory Unit is a part of the CPU (Central Processing Unit). The CPU is the brain of the computer, and it has several components working together. The memory unit is responsible for storing data and instructions that the CPU needs to process information and carry out tasks. Output Device: Sends processed information to the external world, such as printers, monitors, speakers, etc. Input Device: Provides data and instructions to the computer, such as keyboards, mice, scanners, etc. Control Unit: Controls the flow of data through the CPU and coordinates the activities of other components.

মেমোরি দুই ভাগে ভাগ করা হয়: ১) প্রধান মেমোরি (Main Memory): কম্পিউটার চালু থাকাকালীন ডেটা এবং প্রোগ্রাম সংরক্ষণ করে। এটি দ্রুত কিন্তু অস্থায়ী। ২) সেকেন্ডারি মেমোরি (Secondary Memory): প্রধান মেমোরির চেয়ে ধীর কিন্তু স্থায়ী। ডেটা দীর্ঘ সময়ের জন্য সংরক্ষণ করে যখন কম্পিউটার বন্ধ থাকে।

You are correct! Data and instructions waiting to be processed and the resulting output are stored in Memory. The memory unit of a computer acts as the temporary or permanent storage location for: Data: Raw information waiting to be processed by the CPU. Instructions: The program code that tells the CPU what actions to perform on the data. Output: The processed information that needs to be displayed or sent to an output device.