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What is the gesture that can be produced by rubbing your index finger against your thumb?

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What is the gesture that can be produced by rubbing your index finger against your thumb?

(a) Pressing a virtual button

(b) Twisting a virtual dial

(c) Pressing a virtual button and Twisting a virtual dial

(d) Neither Twisting a virtual dial nor Pressing a virtual button

This question was addressed to me by my school teacher while I was bunking the class.

The doubt is from Taking Control of Gesture Interactions in chapter Designing for IoT of IOT

1 Answer

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Right answer is (b) Twisting a virtual dial

For explanation I would say: Example of soil intuitive virtual tools, you can rub your index finger against your thumb to simulate twisting a virtual dial.

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