Electronics Worksheet: Final Test

Electronics lesson 30: Final electronics test · Set 952 · 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.💡 5 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?
2. 2.💡 3 identical bulbs are joined in series with a 6 V battery (ideal wires). How many volts does each bulb get? =
3. 3.💡 Does it save or waste electricity to switch off empty rooms? (a) wastes electricity (b) saves electricity
4. 4.🔘 Which kind of switch closes near a magnet? (a) a tilt switch (b) a reed switch (c) a push button (d) a slide switch
5. 5.🔘 A cell, a bulb and switches A and B are joined one after another in a single loop (series). A is OFF and B is OFF. Does the bulb glow? (a) Yes (b) No
6. 6.🔋 Does a water pump give electricity or use electricity? (a) gives electricity (b) uses electricity
7. 7.📏 How many milliamperes (mA) is 0.52 A?
8. 8.🤖 if (temperature > 36) { show “Hot” } else if (temperature > 20) { show “Warm” } else { show “Cool” }
   The temperature is 33 °C. What is shown? (a) Hot (b) Cool (c) Warm
9. 9.🔍 Which is the odd one out? (a) close the fridge quickly (b) switch off empty rooms (c) use daylight to read (d) leave fridge door open
10. 10.🔐 Which is the strongest password for a home smart camera? (a) password (b) 123456 (c) admin (d) Tiger#Lamp42!Moon
11. 11.True or false: one tall, one short bar is the symbol for a cell. (a) True (b) False
12. 12.True or false: a circle with an X in it is the symbol for a bulb. (a) True (b) False
13. 13.🗺️ In an input → process → output plan, is “a light level reading” the input, the process or the output? (a) process (b) output (c) input
14. 14.💡 Does it save or waste electricity to use old filament bulbs? (a) saves electricity (b) wastes electricity
15. 15.💡 A red LED uses 2 V and should get 10 mA. It runs from a 12 V supply. What resistor (in ohms) is needed in series?
16. 16.⚠️ Which power source should children use for electronics projects? (a) a mains extension board (b) an inverter socket (c) a small battery pack (d) a wall socket
17. 17.🔘 Which kind of switch flips up or down? (a) a tilt switch (b) a reed switch (c) a toggle switch (d) a push button
18. 18.🌈 A resistor has the colour bands brown, orange, orange. What is its value (in ohms)?
19. 19.🗺️ In “input → process → output”, which part is the decision the program makes? (a) the process (b) the input (c) the output (d) the battery
20. 20.🔋 6 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)? =
21. 21.⚡ Which formula gives electric power? (a) P = V ÷ I (b) P = V × I (c) P = V + I (d) P = I ÷ V
22. 22.🔢 To plan an electronics project, what comes right after “pick a problem to solve”? (a) build it with an adult (b) list inputs and outputs (c) test it and fix it (d) draw the circuit diagram
23. 23.🔁 What does “count = count + 1” do? (a) takes 1 away (b) adds 1 to count (c) sets count to 1 (d) prints 1
24. 24.Which of these is measured in volts (V)? (a) power (b) the push of a cell (c) the flow of charge (d) current
25. 25.🔋 Does a battery give electricity or use electricity? (a) uses electricity (b) gives electricity
26. 26.🧾 One “unit” on an electricity bill is … (a) 1 watt (b) 1 ampere (c) 1 kilowatt-hour (kWh) (d) 1 volt
27. 27.🔐 Is it a good or a risky habit to share camera links? (a) risky habit (b) good habit
28. 28.🔍 A distance sensor sends a sound pulse and hears the echo 12 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
29. 29.🧮 Two equal 220 Ω resistors are joined in parallel. What is the total resistance (in ohms)?
30. 30.🧩 Which part changes electrical energy into sound? (a) a capacitor (b) a diode (c) a resistor (d) a buzzer
31. 31.💡 In a parallel circuit, one bulb breaks. What happens to the others? (a) they explode (b) they keep glowing (c) they get dimmer (d) they all go out
32. 32.🔦 A tester circuit has a new cell, a good bulb and wires with a gap between two clips. We put aluminium foil across the gap. Does the bulb glow? (a) No (b) Yes
33. 33.What does a buzzer do? (a) turns a fan or wheels (b) senses how bright it is (c) beeps for an alarm (d) lets current go one way
34. 34.✏️ In a circuit diagram, which part is drawn as a circle with M inside? (a) switch (b) motor (c) LED (d) capacitor
35. 35.True or false: the voltmeter measures voltage. (a) True (b) False
36. 36.⏱️ How many milliseconds is a wait of 3.8 seconds?
37. 37.🔘 Two switches are in parallel (side by side). When does the bulb glow? (a) only when both are OFF (b) never (c) when either is ON (d) only when both are ON
38. 38.🔢 To run one loop of a plant-watering program, which comes first: “read the soil sensor” or “compare with the limit”? (a) compare with the limit (b) read the soil sensor
39. 39.True or false: a line lifted at a gap is the symbol for a capacitor. (a) False (b) True
40. 40.🌐 Each reading a sensor sends is 25 bytes. How many bytes do 170 readings take?

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