grade 2-4

1. In the Electronic Playground, what do we use to turn the LED on and off?

• A) Wires

• B) Buzzer

• C) Switch

• D) Resistor

2. What is LED stands for?

• A) Light Emitting Diode

• B) Line Energy Driver

• C) Light Electronic Device

• D) Low Energy Display

3. Which part of the circuit helps us make the LED brighter or dimmer?

• A) Battery

• B) Wire

• C) Potentiometer(knob)

• D) Switch

4. What happens when we slowly turn the brightness controller to the right?

• A) The LED turns off

• B) The LED becomes brighter

• C) The LED becomes dimmer

• D) Nothing will happen

5. What is a “Lazy LED”?

• A) It changes color

• B) It takes time to turn ON or OFF

• C) It is very bright

• D) It moves slowly

6. Which component makes the LED light up slowly in a Lazy LED circuit?

• A) Battery

• B) Switch

• C) Capacitor

• D) Buzzer

7. What does the capacitor do in the Lazy LED circuit?

• A) Makes a sound

• B) Stores and slowly releases energy

• C) Changes the LED color

• D) Increases battery power

8. What happens to the Lazy LED when the capacitor is fully charged?

• A) It turns off

• B) It blinks

• C) It becomes fully bright

• D) It makes noise

9. What happens when we switch off the switch in the Lazy LED circuit?

• A) The LED turns brighter

• B) The LED turns dim and goes off

• C) The LED turns OFF

• D) The wires change color

10. What is the job of a resistor in a circuit?

• A) To make a sound

• B) To increase light brightness

• C) To control or reduce the flow of electricity

• D) To charge the battery