Which of the following is an electronic device? A. Capacitor B. Resistor C. Inductor D. Transistor

Here are the solutions to the objective test items:

1. Which of the following is an electronic device?

• A. Capacitor
• B. Resistor
• C. Inductor
• D. Transistor

A capacitor, resistor, and inductor are passive electronic components. A transistor is an active semiconductor electronic device used for switching or amplification. While all are electronic components, a transistor is often specifically referred to as an "electronic device" due to its active nature and more complex functionality compared to passive components.

The correct option is D.
$\boxed{\text{D. Transistor}}$

2. A diode that detects light energy

• A. an LED
• B. a rectifier
• C.