Electronics Worksheet: Final Test

Electronics lesson 30: Final electronics test · Set 60 · 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: if the switch is OFF, the circuit is open and no current flows. (a) False (b) True
2. 2.Which job needs an LED? (a) turn to an exact angle (b) spin a robot’s wheels (c) show a status light (d) show the temperature
3. 3.Which of these gives us electricity? (a) a water pump (b) a mobile phone (c) an air conditioner (d) a battery
4. 4.Which of these uses electricity? (a) a solar panel (b) a refrigerator (c) a generator (d) a battery
5. 5.💡 Why does an LED need a resistor in series? (a) to change its colour (b) to make it brighter (c) to limit the current (d) to store charge
6. 6.🔁 count = 5
   repeat 6 times { count = count + 3 }
   What is count at the end?
7. 7.🌈 Which colour bands (1st digit, 2nd digit, multiplier) mark an 88 Ω resistor? (a) grey-white-black (b) grey-grey-black (c) grey-grey-brown (d) white-grey-black
8. 8.True or false: “count button presses” is the output. (a) False (b) True
9. 9.🔘 When a switch is ON, the circuit is … (a) open (b) cut (c) broken (d) closed
10. 10.Which of these is a conductor? (a) a steel coin (b) a paper strip (c) a cotton thread (d) a plastic ruler
11. 11.🔍 Which is the odd one out? (a) a rubber eraser (b) a copper wire (c) a wooden stick (d) a woollen thread
12. 12.🔐 Is it a good or a risky habit to read app permissions? (a) risky habit (b) good habit
13. 13.🌐 In an IoT system, which part measures the real world? (a) actuator (b) sensor (c) phone app (d) Wi-Fi
14. 14.Which of these is a risky habit? (a) cover unused cameras (b) share camera links (c) set up with a parent (d) read app permissions
15. 15.✏️ In a circuit diagram, which part is drawn as two equal parallel lines? (a) motor (b) capacitor (c) cell (d) battery
16. 16.⏱️ What does “wait 500 ms” do? (a) waits 500 seconds (b) blinks 500 times (c) pauses for half a second (d) turns the LED off
17. 17.🧾 Which lamp gives the same light for the least power? (a) an oil lamp (b) an LED lamp (c) a candle (d) a filament bulb
18. 18.True or false: to open blinds at sunrise, use a light sensor. (a) True (b) False
19. 19.True or false: a buzzer makes a beeping sound. (a) False (b) True
20. 20.🧮 Two equal 330 Ω resistors are joined in parallel. What is the total resistance (in ohms)?
21. 21.🔘 Switch A is on the main wire next to the cell and the bulb; then the wire splits into two side-by-side paths, one with switch B and one with switch C. A is OFF, B is ON and C is ON. Does the bulb glow? (a) No (b) Yes
22. 22.🧾 A 1000 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
23. 23.💡 A battery lights 3 identical bulbs joined in parallel. One more identical bulb is added in parallel. How do the bulbs glow now? (a) the same (b) brighter (c) dimmer
24. 24.🏠 Which is a smart-home example? (a) a hand fan (b) lights on from an app (c) a candle in a jar (d) a printed map
25. 25.Which of these is a conductor? (a) a woollen thread (b) a paper strip (c) a rubber eraser (d) a steel spoon
26. 26.🔋 8 identical 1.5 V cells are joined in series, but one of them is put in the wrong way round. What is the total voltage now (in volts)? =
27. 27.🧩 A capacitor in a circuit can … (a) make light (b) spin a wheel (c) store charge briefly (d) measure heat
28. 28.🔐 Is it a good or a risky habit to change default passwords? (a) risky habit (b) good habit
29. 29.💡 A red LED uses 2 V and should get 25 mA. It runs from a 5 V supply. What resistor (in ohms) is needed in series?
30. 30.🌐 Is a plain table fan an IoT device? (a) not an IoT device (b) an IoT device
31. 31.🔍 Which is the odd one out? (a) use daylight to read (b) iron one shirt at a time (c) run fans in empty rooms (d) leave the TV on standby
32. 32.🤖 Does a bicycle bell usually have a microcontroller inside? (a) Yes (b) No
33. 33.Which of these gives us electricity? (a) a refrigerator (b) a washing machine (c) a bicycle dynamo (d) a computer
34. 34.🤖 if (temperature > 30) { show “Hot” } else if (temperature > 22) { show “Warm” } else { show “Cool” }
    The temperature is 18 °C. What is shown? (a) Warm (b) Cool (c) Hot
35. 35.True or false: to stop if a part gets hot is safe. (a) True (b) False
36. 36.💡 Old festival light strings went fully dark when one bulb failed. How were they joined? (a) in series (b) in parallel (c) by Wi-Fi (d) not joined
37. 37.🔋 Does a solar panel give electricity or use electricity? (a) uses electricity (b) gives electricity
38. 38.🔘 Which kind of switch slides side to side? (a) a toggle switch (b) a slide switch (c) a reed switch (d) a push button
39. 39.True or false: a toy robot usually has a microcontroller inside. (a) False (b) True
40. 40.🔁 x = 2
    repeat 3 times { x = x × 2 }
    What is x at the end?

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