Computer practice question for SSC. Select an option to check your answer, read the explanation and continue practicing.
Which of the following is an input device used to enter motion data in computers or other electronic devices?
Correct Answerसही उत्तर
B. TrackballB. ट्रैकबॉल
Explanationव्याख्या
The correct answer is Trackball.
According to the source, a trackball is a pointing input device consisting of a ball held in a socket containing sensors that detect rotation of the ball about two axes.
The user rolls the ball with the thumb, fingers or palm of the hand in order to move a cursor.
Therefore the source-supported revision chain is: Trackball — Pointing Input Device — Ball in a Socket — Sensors Detect Rotation — Two Axes — User Rolls Ball — Cursor Movement.
Monitor, Plotter and Joystick are distractors in this question.
Although a joystick also controls movement and appears in the previous source question, the present question's printed answer identifies Trackball for entering motion data.
Students should therefore distinguish the source definitions: Joystick — movable lever controlling image movement; Trackball — ball-based pointing input device used to move a cursor.
The book does not discuss optical versus mechanical trackballs, buttons, interfaces, ergonomics or modern applications.
Therefore those details have not been added.
A reverse question may ask which pointing device uses a ball in a sensor-equipped socket; according to the source, the answer is Trackball.
Quick revision: Trackball = Ball + Socket + Rotation Sensors + Cursor Movement.
Therefore option (b), Trackball, is correct.
सही उत्तर Trackball है। स्रोत के अनुसार Trackball एक pointing input device है जिसमें एक ball socket के अंदर रहती है और socket में sensors होते हैं जो ball की two axes पर rotation detect करते हैं। User thumb, fingers या palm से ball को roll करके cursor move करता है। इसलिए complete source-supported revision chain है: Trackball — Pointing Input Device — Ball in Socket — Sensors — Rotation about Two Axes — Cursor Movement। Monitor, Plotter और Joystick distractors हैं। Previous question में Joystick भी movement control से जुड़ा था, इसलिए distinction याद रखें: Joystick = movable lever द्वारा image movement control; Trackball = ball-based pointing device द्वारा cursor movement। Source optical/mechanical trackball, buttons, interface, ergonomics या modern applications की details नहीं देती। इसलिए outside information नहीं जोड़ी गई है। Reverse question हो सकता है: sensor-equipped socket में ball वाला pointing device कौन-सा है? Source के अनुसार answer Trackball है। Quick revision: Trackball = Ball + Socket + Sensors + Cursor Movement। इसलिए विकल्प (b), Trackball, सही उत्तर है।
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