Electronics Worksheet: Final Test

Electronics lesson 30: Final electronics test · Set 843 · 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.Which of these is an output? (a) a light sensor (b) a push button (c) a temperature sensor (d) a small display
2. 2.🔁 What does “count = count + 1” do? (a) sets count to 1 (b) prints 1 (c) takes 1 away (d) adds 1 to count
3. 3.✏️ In a circuit diagram, which part is drawn as two equal parallel lines? (a) resistor (b) capacitor (c) bulb (d) diode
4. 4.🔌 Is a rubber band a conductor or an insulator? (a) an insulator (b) a conductor
5. 5.🧾 A 1000 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
6. 6.True or false: a small empty box is the symbol for a switch. (a) False (b) True
7. 7.💡 Does it save or waste electricity to leave the TV on standby? (a) wastes electricity (b) saves electricity
8. 8.🔺 A current of 0.25 A flows through a 10 Ω resistor. What is the voltage across it (in volts)? =
9. 9.🔋 Identical cells side by side (in parallel) give … (a) half the voltage (b) double the voltage (c) no voltage (d) the same voltage
10. 10.💡 A battery lights 2 identical bulbs joined in parallel. One more identical bulb is added in parallel. How do the bulbs glow now? (a) dimmer (b) brighter (c) the same
11. 11.⏱️ How many milliseconds is a wait of 2 seconds?
12. 12.True or false: triangle, bar and arrows is the symbol for a capacitor. (a) False (b) True
13. 13.True or false: a tilt switch flips up or down. (a) True (b) False
14. 14.💡 4 identical bulbs are joined in parallel (each on its own side-by-side path) with a battery and a closed switch on the main wire. Bulbs 1 and 3 are taken out of their holders. How many bulbs glow?
15. 15.✏️ Why do engineers draw circuits with symbols? (a) to make it colourful (b) to hide the circuit (c) quick and clear for all (d) symbols are heavier
16. 16.⚡ An 18 W device works on 6 V. What current does it take (in amperes)? =
17. 17.🔘 A cell and a bulb are joined to two side-by-side paths: path 1 has switches A and B one after another, path 2 has switch C. A is OFF, B is OFF and C is OFF. Does the bulb glow? (a) No (b) Yes
18. 18.Which of these is a good habit? (a) post your live location (b) ignore update messages (c) share camera links (d) cover unused cameras
19. 19.💡 What does LED stand for? (a) light-emitting diode (b) low energy device (c) large electric dial (d) light energy dial
20. 20.📏 How many ohms (Ω) is 4.4 kΩ?
21. 21.🌈 A resistor has the colour bands yellow, black, black. What is its value (in ohms)?
22. 22.🔁 A bulb has two contacts. How many must be joined into the loop for it to glow? (a) only one (b) none (c) both of them (d) it does not matter
23. 23.🧮 Two resistors in parallel give a total that is … (a) always zero (b) less than either one (c) more than either one (d) their sum
24. 24.✏️ In a circuit diagram, which part is drawn as a circle with an X in it? (a) voltmeter (b) LED (c) bulb (d) cell
25. 25.📶 Digital or analog: a knob turned part way? (a) digital (b) analog
26. 26.💡 3 identical bulbs are joined in series with a battery and a closed switch on the main wire. Bulb 2 is taken out of its holder. How many bulbs glow?
27. 27.🤖 if (light < 400 OR motion) { porch lamp ON } else { porch lamp OFF }
    The light reading is 260 and motion is not detected (false). What happens? (a) porch lamp OFF (b) porch lamp ON
28. 28.🧮 Two equal 220 Ω resistors are joined in parallel. What is the total resistance (in ohms)?
29. 29.True or false: if all wires are joined, the circuit is open and no current flows. (a) True (b) False
30. 30.Which job needs a rain sensor? (a) start a fan when hot (b) switch on lamps at dusk (c) measure classroom noise (d) close a window in rain
31. 31.⚠️ Is it safe to poke things in a socket? (a) not safe (b) safe
32. 32.🧩 Which part changes electrical energy into movement? (a) an LED (b) a resistor (c) a motor (d) a fuse
33. 33.🔢 To run one loop of a plant-watering program, what comes right after “compare with the limit”? (a) read the soil sensor (b) switch the pump on/off (c) wait a few seconds
34. 34.True or false: the voltmeter measures current. (a) True (b) False
35. 35.🌈 A resistor has the colour bands white, white, orange. What is its value (in ohms)?
36. 36.🧮 A 1.4 V battery is joined to 12 Ω and 2 Ω resistors in series. What current flows (in amperes)? =
37. 37.💡 4 identical bulbs are joined in series with a battery and a closed switch on the main wire. Bulb 4 is taken out of its holder. Does bulb 1 glow? (a) Yes (b) No
38. 38.🔗 Series or parallel circuit: “a single current path”? (a) series (b) parallel
39. 39.🤖 if (sound > 60) { red LED ON } else { green LED ON }
    The sound sensor reads 45. What happens? (a) red LED ON (b) green LED ON
40. 40.🧩 A capacitor in a circuit can … (a) spin a wheel (b) measure heat (c) make light (d) store charge briefly

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