Electronics Worksheet: Final Test

Electronics lesson 30: Final electronics test · Set 118 · 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.🤖 Microcontroller or laptop: which one needs much more power? (a) laptop (b) microcontroller
2. 2.True or false: “used in house wiring” is true of a parallel circuit. (a) True (b) False
3. 3.📏 Voltmeter or ammeter: which one measures voltage? (a) ammeter (b) voltmeter
4. 4.🌈 A gold fourth band on a resistor means the value may be off by … (a) 25 % (b) 5 % (c) 0 % (d) 50 %
5. 5.🌈 A resistor has the colour bands red, orange, orange. What is its value in kilo-ohms (kΩ)? =
6. 6.🔍 Which sensor would you use to keep an incubator warm? (a) a sound sensor (b) a temperature sensor (c) a light sensor (d) a distance sensor
7. 7.🔁 What does “count = count + 1” do? (a) adds 1 to count (b) sets count to 1 (c) prints 1 (d) takes 1 away
8. 8.🔗 Series or parallel circuit: “own switch for each bulb”? (a) parallel (b) series
9. 9.Which of these is an IoT device? (a) a plain wall switch (b) a battery torch (c) a paper calendar (d) a Wi-Fi smart plug
10. 10.True or false: on a cell, “the flat end” means the + (positive) end. (a) True (b) False
11. 11.🔋 6 identical 1.5 V cells are joined side by side in parallel (all + ends together, all − ends together). What is the voltage across them (in volts)? =
12. 12.🧮 An 8 V battery is joined to 4 Ω and 4 Ω resistors in series. What current flows (in amperes)? =
13. 13.True or false: the voltmeter measures current. (a) False (b) True
14. 14.🔺 A current of 0.1 A flows when 0.3 V is joined across a resistor. What is its resistance (in ohms)?
15. 15.🔌 Is a servo motor an input or an output for a microcontroller? (a) input (b) output
16. 16.🔺 A current of 25 mA flows through a 470 Ω resistor. What is the voltage across it (in volts)? =
17. 17.🔐 Is it a good or a risky habit to set a strong password? (a) good habit (b) risky habit
18. 18.True or false: a plain rectangle is the symbol for a wire. (a) False (b) True
19. 19.🔺 A current of 40 mA flows when 20 V is joined across a resistor. What is its resistance (in ohms)?
20. 20.🔢 To plan an electronics project, what comes right after “draw the circuit diagram”? (a) test it and fix it (b) build it with an adult (c) pick a problem to solve (d) list inputs and outputs
21. 21.🔁 count = 9
    repeat 4 times { count = count + 7 }
    What is count at the end?
22. 22.⚡ Which formula gives electric power? (a) P = V + I (b) P = V × I (c) P = I ÷ V (d) P = V ÷ I
23. 23.True or false: on an LED, the round-side leg is the anode (+). (a) True (b) False
24. 24.Which of these is a good habit? (a) ignore update messages (b) log out of shared phones (c) accept every permission (d) tap unknown app links
25. 25.🧩 Which component makes things spin? (a) LED (b) motor (c) LDR (d) diode
26. 26.True or false: two or more cell symbols is the symbol for a diode. (a) False (b) True
27. 27.⚡ What does a tube light mainly change electricity into? (a) movement (b) heat (c) sound (d) light
28. 28.💡 A battery lights 3 identical bulbs joined in series. One more identical bulb is added in series. How do the bulbs glow now? (a) brighter (b) the same (c) dimmer
29. 29.True or false: “one bulb out, all go out” is true of a parallel circuit. (a) True (b) False
30. 30.⏱️ How many milliseconds are in 1 second? (a) 100 (b) 60 (c) 10 (d) 1000
31. 31.🤖 In “if (temp > 30)”, what runs when temp is exactly 30? (a) the else part (b) both parts (c) neither part (d) the if part
32. 32.True or false: a thermistor makes things spin. (a) True (b) False
33. 33.💡 4 identical bulbs are joined in series with a battery and a closed switch on the main wire. All the bulbs are in place. Does bulb 4 glow? (a) No (b) Yes
34. 34.True or false: to use old filament bulbs saves electricity. (a) True (b) False
35. 35.💡 In a series circuit, how many paths does the current have? (a) one for each bulb (b) none (c) one (d) two
36. 36.🤖 if (temperature > 30) { show “Hot” } else if (temperature > 18) { show “Warm” } else { show “Cool” }
    The temperature is 42 °C. What is shown? (a) Warm (b) Hot (c) Cool
37. 37.🔌 Is a plastic ruler a conductor or an insulator? (a) a conductor (b) an insulator
38. 38.True or false: to cover unused cameras is a risky habit. (a) True (b) False
39. 39.💡 Why does an LED need a resistor in series? (a) to make it brighter (b) to limit the current (c) to change its colour (d) to store charge
40. 40.Which of these is an output? (a) a turning knob (b) a servo motor (c) a temperature sensor (d) a light sensor

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