Electronics Worksheet: Final Test

Electronics lesson 30: Final electronics test · Set 213 · 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.True or false: a motor makes a beeping sound. (a) False (b) True
2. 2.🌈 Which colour bands (1st digit, 2nd digit, multiplier) mark a 56 Ω resistor? (a) green-blue-black (b) blue-green-black (c) blue-blue-black (d) green-blue-brown
3. 3.Which of these is true of a parallel circuit? (a) used in house wiring (b) bulbs share the voltage (c) a single current path (d) a break stops every bulb
4. 4.🔍 Which sensor would you use to make a parking alarm? (a) a motion sensor (b) a gas sensor (c) a distance sensor (d) a soil moisture sensor
5. 5.🤖 if (temperature > 34) { show “Hot” } else if (temperature > 19) { show “Warm” } else { show “Cool” }
   The temperature is 14 °C. What is shown? (a) Cool (b) Warm (c) Hot
6. 6.True or false: one tall, one short bar is the symbol for a switch. (a) False (b) True
7. 7.True or false: a fuse stores a little charge. (a) True (b) False
8. 8.🔋 Cells joined + to − in a row (series) give … (a) a smaller voltage (b) the same voltage (c) a bigger voltage (d) no voltage
9. 9.⚡ A device works on 1.5 V and takes 0.1 A. What is its power (in watts)? =
10. 10.⚡ What does an electric kettle mainly change electricity into? (a) heat (b) sound (c) light (d) movement
11. 11.💡 6 identical bulbs are joined in series with a battery and a closed switch on the main wire. Bulb 6 is taken out of its holder. Does bulb 1 glow? (a) Yes (b) No
12. 12.🔺 In the V-I-R triangle, how do we find V? (a) V = R ÷ I (b) V = I × R (c) V = I + R (d) V = I ÷ R
13. 13.True or false: if a wire has come loose, the circuit is closed and current flows. (a) False (b) True
14. 14.Which of these means the circuit is closed? (a) a wire is cut (b) the bulb is unscrewed (c) the loop is complete (d) a cell is taken out
15. 15.🔁 repeat 6 times { repeat 3 times { beep } }
    How many beeps are there?
16. 16.True or false: a loudspeaker mainly gives out heat. (a) False (b) True
17. 17.🔌 Is an LED an input or an output for a microcontroller? (a) output (b) input
18. 18.True or false: on an LED, the longer leg is the anode (+). (a) True (b) False
19. 19.🔋 Does a mobile phone give electricity or use electricity? (a) uses electricity (b) gives electricity
20. 20.🔍 Which is the odd one out? (a) a Wi-Fi doorbell camera (b) a pencil sharpener (c) a Wi-Fi weather station (d) a Wi-Fi smart plug
21. 21.🧮 Two resistors in parallel give a total that is … (a) more than either one (b) their sum (c) always zero (d) less than either one
22. 22.🔺 A current of 0.1 A flows when 0.5 V is joined across a resistor. What is its resistance (in ohms)?
23. 23.What does a diode do? (a) makes a beeping sound (b) boosts a small signal (c) lets current go one way (d) is a resistance knob
24. 24.🔢 To run one loop of a plant-watering program, which comes first: “wait a few seconds” or “switch the pump on/off”? (a) switch the pump on/off (b) wait a few seconds
25. 25.Which drawing is the symbol for a junction? (a) a circle with V inside (b) a circle with M inside (c) a dot where wires meet (d) a circle with an X in it
26. 26.🧾 One “unit” on an electricity bill is … (a) 1 ampere (b) 1 volt (c) 1 kilowatt-hour (kWh) (d) 1 watt
27. 27.🔺 The voltage stays the same and the resistance gets bigger. The current … (a) gets bigger (b) gets smaller (c) becomes zero (d) stays the same
28. 28.True or false: a capacitor is a resistance knob. (a) False (b) True
29. 29.💡 Why does an LED need a resistor in series? (a) to limit the current (b) to store charge (c) to change its colour (d) to make it brighter
30. 30.🧮 Adding another resistor in series makes the total resistance … (a) stay the same (b) smaller (c) zero (d) bigger
31. 31.💡 In a series circuit, how many paths does the current have? (a) one for each bulb (b) none (c) two (d) one
32. 32.⚡ A device works on 6 V and takes 1.5 A. What is its power (in watts)? =
33. 33.🧩 Which component senses how hot it is? (a) motor (b) LED (c) capacitor (d) thermistor
34. 34.🔍 For a microcontroller, is a sensor an input or an output? (a) an input (b) an output (c) a fuse (d) a power source
35. 35.📏 Which unit measures the flow of charge? (a) watt (W) (b) ohm (Ω) (c) ampere (A) (d) volt (V)
36. 36.📏 Voltmeter or ammeter: which one measures voltage? (a) ammeter (b) voltmeter
37. 37.⏱️ How many milliseconds are in 1 second? (a) 1000 (b) 100 (c) 10 (d) 60
38. 38.True or false: “own switch for each bulb” is true of a series circuit. (a) False (b) True
39. 39.🧮 Resistors of 33 Ω, 220 Ω and 22 Ω are joined in series. What is the total resistance (in ohms)?
40. 40.⚡ Which formula gives electric power? (a) P = V ÷ I (b) P = V × I (c) P = V + I (d) P = I ÷ V

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