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hpssc joa exam preparation (Joa It mcq pdf)

HPSSC JOA - IT (939) Exam Preparation mcq questions for practice. Q-1) Out of following, whom do you think is the most probable user of Light Pen? i) Computer Programmer ii) Graphic Designer iii) Journalist iv) computer Scientist Ans. Graphic Designer Q-2) Name the type of mouse which uses laser technology to detect the motion of the ball. i) Optical Mouse ii) Mechanical Mouse iii) Opto Mechanical Mouse iv) All of these Ans. Optical Mouse Q-3) Which is a vector based graphical printing device? i) Printers ii) Plotters iii) Scanners iv) Light Pen Ans. Plotters Q-4) Which type of plotter is used to produce continuous output such as plotting earthquake activity? i) Drum Plotter ii) Flatbed plotter iii) Disk platters iv) None of these Ans. Drum Plotters Q-5) The diameter of the standard CD is............... i) 70mm ii) 80mm iii) 120mm iv) 180mm Ans. 120mm Q-6) The Speed of a Dot Matrix printer is measured in.........

What is Operating System? What are the types of operating system, Features and commonly used operating systems?

What is Operating System? The Operating System (OS) is the most important program that runs on a computer. Computer being a machine cannot do anything on its own. It requires specific instructions on how to perform each and every task. The user cannot communicate with the computer directly. Thus, you require an interface between the user and the hardware. The computer operating system acts like an interface. Operating system is the master program, which makes a PC alive and helps to run different applications. An operating system is a program which acts as an interface between a user and the hardware . An operating system is an important component of a computer system which controls all other components of the computer system. Operating system acts as a central coordinator between hardware and software. The operating system is classified into GUI and CUI, based on the way it interacts with the users. An Operating system encompasses all the operations like: What to do?

Input and Output Devices

Input Devices Input refers to the data or instructions which we feed into a computer. Input devices are used to enrer data and information into a computer. The input unit converts the incoming data and instructions into a pattern of binary codes which is understood by a computer. Then it further supplies data to the processor for processing. Some of the input devices are: 1. Keyboard: Keyboard is the one of the most important devices used to input data and instructions into a computer. The standard computer keyboards typically contain 101 keys. There are mainly five types of keys on a keyboard: types of keys Keyboard 2. Mouse: Mouse is the most commonly used input and pointing device that lets you select and move items on the screen. The left mouse button is used more, frequently than the right button. A single left click selects an item while double-clicking on an item activates the application. The right-click often displays a list of commands on the screen. Types of mous

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