When the user presses one of the buttons, the mouse either marks a place on the screen or makes selection from data or menu on the screen. As a user moves the mouse on a flat surface, the mouse controls the cursor movement on the screen. The mouse is an input device that usually contains one or two buttons. Other examples of input devices are: mouse, joystick, trackball, light pens, digitizers, scanners, optical character reader (OCR), touch window, etc.
For example, a keyboard is commonly used to transfer data or information from human readable form to machine readable form. A variety of input devices are used with the computer depending on the type and purpose of input information. The computer follows the instructions given to it by and input device. Input devices are used to provide data or information to the computer. Question: Name the different categories of input devices?
We can open application programs, operate the menus of the application and save the work. It may be used to say text (word) to the computer or to give commands to the computer. User can input his voice through speaker into the system. Question: What is voice recognition software? Explain.Ī voice recognition system uses a microphone as input device and it converts a person‟s speech into digital data by comparing the electrical pattern produces by the voice with a set of prerecorded patterns stored in the computer. Secondly we can place a trackball on any type of surface. Question: What is advantage of trackball over mouse?Īnswer: The advantage of trackball is that the trackball is stationary and it does not require much space for use. This event is used to select more than one item at a time or to drop and object into another application. Question: What are the functions performed by drag event of a mouse?ĭrag event triggers when we keep on pressing the left mouse button while moving the mouse. Right click is used to view the properties of an object such as file, folder, desktop etc. Question: What is the function of right click? Left click is use to select a graphical object such as a file icon and a piece of text in a document etc or to press a button such as start button and closing, opening and minimizing a window. Question What is the function of left click? This will help you to revise and learn the entire course fast and easily. Please refer to the below Input and Output Devices Class 9 Computer Science solved questions.
Class 9 Computer Science Input and Output Devices Notes and Questions You can go through the questions and solutions below which will help you to get better marks in your examinations. These revision notes and important examination questions have been prepared based on the latest Computer Science books for Class 9. The answers have been carefully curated by highly trained and experienced teachers from across the nation.Please refer to Input and Output Devices Class 9 Computer Science notes and questions with solutions below. The quality of the NCERT social science class 9 book solutions is simply impeccable.
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