Electronics Worksheet: Final Test

Electronics lesson 30: Final electronics test · Set 83 · 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.⚡ A bicycle dynamo changes which kind of energy into electricity? (a) chemical energy (b) movement energy (c) sound energy (d) light energy
2. 2.🧩 Which component makes a beeping sound? (a) diode (b) transistor (c) motor (d) buzzer
3. 3.🔘 When a switch is ON, the circuit is … (a) broken (b) closed (c) open (d) cut
4. 4.True or false: the ammeter measures voltage. (a) True (b) False
5. 5.🔁 What does a variable do in a program? (a) blinks an LED (b) measures light (c) joins two wires (d) stores a value
6. 6.True or false: to share camera links is a good habit. (a) True (b) False
7. 7.🌈 A resistor has the colour bands white, violet, black. What is its value (in ohms)?
8. 8.💡 A red LED (it uses 2 V) is joined with a 100 Ω resistor to a 2.5 V supply. What current flows (in mA)?
9. 9.🔋 Identical cells side by side (in parallel) give … (a) the same voltage (b) double the voltage (c) half the voltage (d) no voltage
10. 10.True or false: a toggle switch flips up or down. (a) False (b) True
11. 11.True or false: a buzzer makes a beeping sound. (a) True (b) False
12. 12.What does the cloud server do? (a) carries the data (b) measures the real world (c) stores data online (d) reads values, decides
13. 13.🧾 One “unit” on an electricity bill is … (a) 1 watt (b) 1 kilowatt-hour (kWh) (c) 1 volt (d) 1 ampere
14. 14.🔌 Is aluminium foil a conductor or an insulator? (a) a conductor (b) an insulator
15. 15.Which of these wastes electricity? (a) use LED lamps (b) unplug idle chargers (c) leave the TV on standby (d) use daylight to read
16. 16.🔐 Why install updates on IoT devices? (a) they make it heavier (b) they fix security holes (c) they change the colour (d) they delete the Wi-Fi
17. 17.🔐 A smart-camera app asks for your school name and home address. What should you do? (a) share it with friends (b) type it all in (c) ask a parent first (d) post it online
18. 18.🌈 Which colour bands (1st digit, 2nd digit, multiplier) mark a 2700 Ω resistor? (a) red-violet-red (b) violet-red-red (c) red-violet-brown (d) red-violet-orange
19. 19.🌈 Which colour bands (1st digit, 2nd digit, multiplier) mark a 92 Ω resistor? (a) white-red-brown (b) red-white-black (c) brown-red-black (d) white-red-black
20. 20.🤖 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
21. 21.True or false: the push of a cell is measured in volts (V). (a) True (b) False
22. 22.🧩 A capacitor in a circuit can … (a) store charge briefly (b) spin a wheel (c) make light (d) measure heat
23. 23.What does a potentiometer do? (a) is a resistance knob (b) glows using little power (c) boosts a small signal (d) makes things spin
24. 24.✏️ In a circuit diagram, which part is drawn as a long and a short line? (a) capacitor (b) ammeter (c) bulb (d) cell
25. 25.🔋 A 3 V battery and four 1.5 V cells are joined in series, all facing the same way. What is the total voltage (in volts)? =
26. 26.Which of these is the process? (a) decide if soil is dry (b) a temperature reading (c) a button press (d) an LED lights up
27. 27.True or false: to make a parking alarm, use a light sensor. (a) False (b) True
28. 28.Which of these is an output? (a) a sound sensor (b) a water pump (c) a temperature sensor (d) a keypad
29. 29.💡 A battery lights 4 identical bulbs joined in parallel. One more identical bulb is added in parallel. How do the bulbs glow now? (a) dimmer (b) the same (c) brighter
30. 30.True or false: a buzzer limits the current. (a) True (b) False
31. 31.🔁 What does “count = count + 1” do? (a) sets count to 1 (b) prints 1 (c) takes 1 away (d) adds 1 to count
32. 32.Which drawing is the symbol for a capacitor? (a) a circle with V inside (b) triangle, bar and arrows (c) two equal parallel lines (d) two or more cell symbols
33. 33.🔢 To run one loop of a plant-watering program, which comes first: “read the soil sensor” or “switch the pump on/off”? (a) read the soil sensor (b) switch the pump on/off
34. 34.Which of these mainly gives out light? (a) a torch (b) a water heater (c) an electric iron (d) a loudspeaker
35. 35.🌐 A weather station sends one reading every 30 seconds. How many readings does it send in 1 minute?
36. 36.🔍 Which is the odd one out? (a) a Wi-Fi weather station (b) a fitness band with app (c) a plain wall switch (d) a Wi-Fi doorbell camera
37. 37.What does a resistor do? (a) glows using little power (b) has coloured bands (c) boosts a small signal (d) turns a fan or wheels
38. 38.🧩 Which part changes electrical energy into sound? (a) a diode (b) a buzzer (c) a resistor (d) a capacitor
39. 39.True or false: on an LED, the round-side leg is the cathode (−). (a) False (b) True
40. 40.🔦 A circuit has a new cell, a good bulb and a switch that is ON. All the wires are firmly joined. A gap in one wire is bridged by a copper wire. Does the bulb glow? (a) No (b) Yes

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