Arduino Basics Mastery Quiz

1. What is the main purpose of a breadboard?

a) To permanently solder parts b) To connect parts without soldering c) To power an Arduino directly d) To cool electronic components

2. On a breadboard, the side rails are typically used for:

a) Connecting resistors b) Holding the Arduino board c) Power and ground connections d) Mounting LEDs

3. In Wokwi, clicking the green Start button does what?

a) Compiles Arduino code b) Powers up and runs the simulation c) Saves the circuit d) Opens the Serial Monitor

4. What is the role of a resistor in an LED circuit?

a) Increases current flow b) Reduces current to protect the LED c) Converts current to voltage d) Stores energy

5. When two LEDs are connected in series, how is brightness typically affected?

a) Brighter than one LED b) Dimmer than one LED c) The same brightness d) Depends on the wire color

6. In a parallel LED circuit, each LED should:

a) Share one resistor b) Have its own resistor for equal brightness c) Get half the current d) Glow dimmer than series

7. The max safe current draw from a USB 2.0 port powering an Arduino is:

a) 100 mA b) 250 mA c) 500 mA d) 900 mA

8. According to Ohm’s Law, current I equals:

a) I = V × R b) I = R / V c) I = V / R d) I = V + R

9. In a series circuit with R₁ = 200 Ω and R₂ = 300 Ω, the total resistance is:

a) 100 Ω b) 500 Ω c) 150 Ω d) 250 Ω

10. Two resistors 200 Ω and 300 Ω in parallel have a total resistance of approximately:

a) 500 Ω b) 120 Ω c) 60 Ω d) 300 Ω

11. You must use glue to keep components on a breadboard.

True False

12. The blue/black line on a breadboard side rail usually represents ground (–).

True False

13. Removing a component from a breadboard damages it permanently.

True False

14. The LED anode connects to the positive side of the circuit (e.g., 5 V).

True False

15. A 220 Ω resistor offers less resistance than a 330 Ω resistor.

True False

16. Two LEDs in series share the same current but divide the voltage.

True False

17. The Arduino Uno can run in Wokwi without installing software.

True False

18. Parallel LED circuits use less total current than series circuits.

True False

19. The series resistor with an LED prevents the LED from burning out.

True False

20. Ohm’s Law lets you find current, voltage, or resistance if any two are known.

True False

21. Explain why LEDs are typically brighter in parallel than in series.

22. A 9 V battery powers two resistors in series (200 Ω + 300 Ω). Calculate the total current in the circuit.

23. For a single yellow LED (≈2 V drop) with a 220 Ω resistor on 5 V, estimate the current through the LED.

24. What happens if you connect an LED directly to 5 V without a resistor?

25. If each yellow LED draws about 15 mA, roughly how many could you power from USB before reaching the 500 mA limit?