Electronics Worksheet: Final Test

Electronics lesson 30: Final electronics test · Set 906 · 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.🔌 Is a turning knob an input or an output for a microcontroller? (a) output (b) input
2. 2.💡 5 identical bulbs are joined in series with a battery and a closed switch on the main wire. Bulb 2 is taken out of its holder. How many bulbs glow?
3. 3.True or false: the ammeter is joined in series. (a) False (b) True
4. 4.🔍 Which is the odd one out? (a) an exhaust fan (b) a tube light (c) a night lamp (d) a street light
5. 5.✏️ Why do engineers draw circuits with symbols? (a) symbols are heavier (b) quick and clear for all (c) to hide the circuit (d) to make it colourful
6. 6.True or false: a circle with a cross is the symbol for an LED. (a) False (b) True
7. 7.🔍 Which is the odd one out? (a) a steel spoon (b) a metal paper clip (c) a copper wire (d) a ceramic cup
8. 8.🔌 Most metals are good … (a) batteries (b) magnets only (c) insulators (d) conductors
9. 9.True or false: to set a strong password is a risky habit. (a) True (b) False
10. 10.True or false: to unplug idle chargers wastes electricity. (a) True (b) False
11. 11.What does a push button do? (a) springs back when let go (b) closes when tipped over (c) closes near a magnet (d) stays where you flip it
12. 12.True or false: if all wires are joined, the circuit is closed and current flows. (a) True (b) False
13. 13.🔢 To run one loop of a plant-watering program, what comes right after “compare with the limit”? (a) wait a few seconds (b) read the soil sensor (c) switch the pump on/off
14. 14.True or false: “how loud a sound is” is a digital signal. (a) True (b) False
15. 15.🤖 if (distance < 10) { buzzer beeps } else { buzzer is silent }
    The distance sensor reads 18 cm. What happens? (a) buzzer beeps (b) buzzer is silent
16. 16.⚡ A device works on 12 V and takes 3 A. What is its power (in watts)? =
17. 17.True or false: one tall, one short bar is the symbol for a diode. (a) False (b) True
18. 18.🔋 Cells joined + to − in a row (series) give … (a) no voltage (b) a bigger voltage (c) a smaller voltage (d) the same voltage
19. 19.What does a push button do? (a) stays where you flip it (b) closes near a magnet (c) flips up or down (d) works only while pressed
20. 20.⚙️ Which actuator would you use to spin a robot’s wheels? (a) a buzzer (b) a servo motor (c) a pump (d) a motor
21. 21.True or false: “one bulb out, all go out” is true of a parallel circuit. (a) False (b) True
22. 22.🧮 Adding another resistor in series makes the total resistance … (a) smaller (b) bigger (c) zero (d) stay the same
23. 23.Which of these is safe? (a) touch a switch when wet (b) climb an electric pole (c) keep drinks far away (d) fly a kite near wires
24. 24.🔺 A current of 1 A flows when 12 V is joined across a resistor. What is its resistance (in ohms)?
25. 25.🔐 A smart speaker is always listening for its wake word. What is a sensible habit? (a) mute it when not in use (b) let strangers use it (c) put it in the bathroom (d) tell it your passwords
26. 26.🧩 Which part changes electrical energy into movement? (a) a resistor (b) a motor (c) a fuse (d) an LED
27. 27.True or false: to iron one shirt at a time saves electricity. (a) True (b) False
28. 28.🔐 Is it a good or a risky habit to read app permissions? (a) good habit (b) risky habit
29. 29.💡 Why is house wiring done in parallel? (a) to make bulbs dim (b) so all go off together (c) to save copper only (d) each gets full voltage
30. 30.💡 6 identical bulbs are in parallel and each bulb has its own switch on its path. 2 of the switches are OFF and the rest are ON. How many bulbs glow?
31. 31.🌈 A resistor has the colour bands yellow, grey, red. What is its value (in ohms)?
32. 32.Which of these is an insulator? (a) an iron nail (b) a brass key (c) a glass marble (d) a safety pin
33. 33.🔢 To plan an electronics project, what comes right after “list inputs and outputs”? (a) draw the circuit diagram (b) build it with an adult (c) test it and fix it (d) pick a problem to solve
34. 34.🔐 Privacy for a smart device means controlling … (a) who can see your data (b) its battery size (c) its colour (d) how loud it beeps
35. 35.🔌 Is a paper strip a conductor or an insulator? (a) a conductor (b) an insulator
36. 36.🔍 Which is the odd one out? (a) a sound sensor (b) a water pump (c) a light sensor (d) a keypad
37. 37.🔺 A current of 50 mA flows through a 220 Ω resistor. What is the voltage across it (in volts)? =
38. 38.🤖 In “if (temp > 30)”, what runs when temp is exactly 30? (a) both parts (b) neither part (c) the if part (d) the else part
39. 39.True or false: triangle against a bar is the symbol for a capacitor. (a) False (b) True
40. 40.🔍 Which is the odd one out? (a) set a strong password (b) share the Wi-Fi key (c) change default passwords (d) log out of shared phones

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