Which device sends information about the direction or angle of the stick to the device or application it is controlling?

Appeared in: AIIMS Nagpur NO - 2018

Explanation

A joystick is an input device specifically designed with a stick (lever) that pivots on a base.
Its primary function is to detect the angle and direction of the stick's movement.
This directional data is then sent as an electronic signal to control a computer program or a device, such as a character in a game or the motors of a powered wheelchair.

Option A: A scanner is an input device, but it works by converting physical documents or photographs into a digital format. It does not have a stick and does not control movement based on angle or direction.
Option C: A VDU (Visual Display Unit) is an output device, not an input device. It is a screen or monitor that displays information from the computer. It cannot send control signals to an application.
Option D: A mouse is an input device used to control a cursor on a two-dimensional screen. While it detects motion, it does so on a flat surface and does not use a stick to report an angle of deflection.

Visual 1: Diagram - A simple diagram of a joystick, labeling the stick, base, and buttons, with arrows indicating the axes of movement (X, Y, and sometimes Z for rotation). This helps visualize how it captures directional input.
Visual 2: Photograph - A person with a physical disability independently operating a powered wheelchair using a joystick control. This illustrates the clinical relevance and empowering nature of the device.

Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Function of Computer Input/Output Devices as background academic context rather than a clinical decision trigger.
Joysticks are a cornerstone of assistive technology, enabling patients with severe motor disabilities (e.g., from spinal cord injury, cerebral palsy, ALS) to control powered wheelchairs, computers, and communication devices.
A nurse caring for a patient with a joystick-controlled device should know how to ensure it is positioned correctly for the patient's optimal use, check its battery life, and recognize signs of malfunction that could compromise patient safety and mobility.
What if the patient has minimal hand function? Advanced joystick models can be adapted for chin, mouth (sip-and-puff), or head control, allowing even individuals with very limited mobility to operate their devices.

How to Approach the Question

First, identify the key function described in the question: sending information about the 'direction or angle of a stick'.
Next, consider each option and define its primary purpose in the context of computer hardware.
Scanner: Digitizes images. Does it use a stick? No.
Joystick: Controls movement via a stick. Does it report direction/angle? Yes.
VDU: Displays output. Is it an input device? No.
Mouse: Controls a cursor on a flat surface. Does it use a stick for angle? No.

Concept Tested & Keywords

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Practise the full AIIMS Nagpur NO - 2018

Attempt every question from this paper in a timed mock, then review the full solution for each one.