Electronics Worksheet: Final Test

Electronics lesson 30: Final electronics test · Set 989 · 40 questions

Remember (Find the topic, use the idea): Find the topic: circuit, safety, formula, component, program, sensor or IoT. Use that lesson’s rule — complete loop, V = I × R, P = V × I, last command wins, true → if part. Safety answers are always: low voltage, dry hands, an adult, never the mains.

1. 1.🔋 What is a battery? (a) a kind of bulb (b) two or more cells joined (c) a switch with a lid (d) one single wire
2. 2.🔁 repeat 3 times { repeat 4 times { beep } }
   How many beeps are there?
3. 3.📏 Which unit measures resistance? (a) watt (W) (b) volt (V) (c) ampere (A) (d) ohm (Ω)
4. 4.🔁 What must there be for a current to flow? (a) a broken path (b) a complete loop (c) a plastic gap (d) one loose end
5. 5.🧭 Which part of a microcontroller board runs the program? (a) the reset button (b) the main chip (c) the power LED (d) the pins
6. 6.Which of these means the circuit is closed? (a) a wire is cut (b) the switch is OFF (c) the switch is ON (d) a wire has come loose
7. 7.🔺 The voltage stays the same and the resistance gets bigger. The current … (a) gets smaller (b) stays the same (c) becomes zero (d) gets bigger
8. 8.🗺️ In “input → process → output”, which part is the decision the program makes? (a) the output (b) the input (c) the battery (d) the process
9. 9.🌐 In an IoT system, which part stores data online? (a) phone app (b) microcontroller (c) actuator (d) cloud server
10. 10.💡 A blue LED uses 3 V and should get 20 mA. It runs from a 6 V supply. What resistor (in ohms) is needed in series?
11. 11.💡 A battery lights 5 identical bulbs joined in series. One more identical bulb is added in series. How do the bulbs glow now? (a) dimmer (b) brighter (c) the same
12. 12.🔢 To get a sensor reading onto a phone, what comes right after “the sensor measures”? (a) the cloud stores it (b) the app shows it (c) it is sent by Wi-Fi (d) the board reads it
13. 13.True or false: a spinning top has no microcontroller inside. (a) False (b) True
14. 14.🔌 Is a plastic ruler a conductor or an insulator? (a) an insulator (b) a conductor
15. 15.True or false: “one out, the rest glow” is true of a series circuit. (a) False (b) True
16. 16.True or false: a circle with A inside is the symbol for an ammeter. (a) False (b) True
17. 17.✏️ In a circuit diagram, which part is drawn as a long and a short line? (a) motor (b) ammeter (c) bulb (d) cell
18. 18.🔁 What does a variable do in a program? (a) joins two wires (b) measures light (c) stores a value (d) blinks an LED
19. 19.⏱️ How many milliseconds is a wait of 2.2 seconds?
20. 20.Which of these is a risky habit? (a) log out of shared phones (b) tap unknown app links (c) set up with a parent (d) install software updates
21. 21.🔺 A current of 0.25 A flows through a 5 Ω resistor. What is the voltage across it (in volts)? =
22. 22.Which of these is the process? (a) a temperature reading (b) check if temp > 30 (c) the pump turns on (d) a light level reading
23. 23.True or false: “bulbs share the voltage” is true of a series circuit. (a) False (b) True
24. 24.True or false: “a motion sensor signal” is the output. (a) True (b) False
25. 25.🧩 Which part changes electrical energy into sound? (a) a capacitor (b) a diode (c) a buzzer (d) a resistor
26. 26.🔗 Series or parallel circuit: “bulbs share the voltage”? (a) parallel (b) series
27. 27.True or false: on a cell, “the shorter symbol line” means the − (negative) end. (a) True (b) False
28. 28.⏱️ How many milliseconds is a wait of 4.5 seconds?
29. 29.⚙️ What is an actuator? (a) a program (b) a battery (c) an output that acts (d) a sensor
30. 30.⚙️ Which actuator would you use to spin a robot’s wheels? (a) a motor (b) a pump (c) a servo motor (d) a display
31. 31.💡 Why is house wiring done in parallel? (a) to save copper only (b) to make bulbs dim (c) each gets full voltage (d) so all go off together
32. 32.🔍 Which is the odd one out? (a) install software updates (b) cover unused cameras (c) share the Wi-Fi key (d) read app permissions
33. 33.Which of these mainly makes movement? (a) a tube light (b) a street light (c) a torch (d) a table fan
34. 34.⚡ What does a loudspeaker mainly change electricity into? (a) light (b) sound (c) heat (d) movement
35. 35.🔋 What should you do with used-up cells? (a) throw them in a fire (b) cut them open (c) bury them in soil (d) give them for recycling
36. 36.Which job is done by the pins? (a) connect sensors and LEDs (b) brings power and code (c) keeps the voltage steady (d) restarts the program
37. 37.True or false: to measure classroom noise, use a soil moisture sensor. (a) True (b) False
38. 38.🌐 Is a fitness band with app an IoT device? (a) not an IoT device (b) an IoT device
39. 39.🔺 A current of 2.5 A flows through a 2 Ω resistor. What is the voltage across it (in volts)? =
40. 40.True or false: “used in house wiring” is true of a parallel circuit. (a) False (b) True

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