| The three basic systems that are used in the working of touch screen are Resistive, Capacitive and Surface acoustic wave. Consider the following statements in light of this. |
| 1. The surface acoustic wave system allows a touch with almost any object. |
| 2. As far as price, the resistive system is the cheapest, |
| 3. A capacitive system must have a conductive input, usually your finger, in order to register a touch. |
| Which of the statements given above are correct? |
A) 1 and 2
B) 1 and 3
C) 2 and 3
D) All of these
Correct Answer: D
Solution :
[d] The surface acoustic wave system works much like the resistive system, allowing a touch with any hard and small objects like a pen tip. We know that in case of use of touch screen we are generally using our finger which is conductive, hence it will act like a conductive input for the capacitor. When we will use a pen tip, due to the touch acoustic waves will be produced which will also contribute in sensitivity of the screen.
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