Electronics Worksheet: Final Test

Electronics lesson 30: Final electronics test · Set 712 · 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.🔢 To plan an electronics project, which comes first: “list inputs and outputs” or “build it with an adult”? (a) list inputs and outputs (b) build it with an adult
2. 2.True or false: the ammeter measures current. (a) True (b) False
3. 3.🔌 Is a graphite rod a conductor or an insulator? (a) a conductor (b) an insulator
4. 4.⏱️ How many milliseconds are in 1 second? (a) 60 (b) 100 (c) 10 (d) 1000
5. 5.Which of these usually has a microcontroller inside? (a) a candle (b) a toy robot (c) a hand pump (d) a bicycle bell
6. 6.🔦 A circuit has a new cell, a good bulb and a switch that is ON. One wire has come loose from the cell. A gap in one wire is bridged by a rubber eraser. Does the bulb glow? (a) No (b) Yes
7. 7.Which job needs a servo motor? (a) show the temperature (b) open a gate to 90° (c) move water to plants (d) beep an alarm
8. 8.True or false: “bulbs share the voltage” is true of a series circuit. (a) False (b) True
9. 9.💡 6 identical bulbs are in parallel and each one takes 1.5 A. What total current (in amperes) comes from the battery? =
10. 10.🔘 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 ON, B is ON and C is OFF. Does the bulb glow? (a) Yes (b) No
11. 11.Which of these means the circuit is closed? (a) a wire has come loose (b) the switch is OFF (c) the switch is ON (d) a cell is taken out
12. 12.True or false: a woollen thread is an insulator. (a) True (b) False
13. 13.✏️ In a circuit diagram, which part is drawn as a dot where wires meet? (a) junction (b) LED (c) diode (d) wire
14. 14.🔁 count = 5
    while (count < 37) { count = count + 4 }
    How many times does the loop run?
15. 15.🔌 Is aluminium foil a conductor or an insulator? (a) an insulator (b) a conductor
16. 16.Which of these wastes electricity? (a) run fans in empty rooms (b) use daylight to read (c) unplug idle chargers (d) set the AC to 24 °C
17. 17.🔦 A tester circuit has a new cell, a good bulb and wires with a gap between two clips. We put a safety pin across the gap. Does the bulb glow? (a) No (b) Yes
18. 18.💡 A red LED (it uses 2 V) is joined with a 150 Ω resistor to a 3.5 V supply. What current flows (in mA)?
19. 19.🧮 A 4.5 V battery is joined to 3 Ω and 6 Ω resistors in series. What current flows (in amperes)? =
20. 20.⚡ What does a loudspeaker mainly change electricity into? (a) heat (b) sound (c) light (d) movement
21. 21.🔺 A 10 V supply is joined across a 20 Ω resistor. What current flows (in amperes)? =
22. 22.⏱️ What does “wait 500 ms” do? (a) waits 500 seconds (b) turns the LED off (c) blinks 500 times (d) pauses for half a second
23. 23.💡 Does it save or waste electricity to use old filament bulbs? (a) saves electricity (b) wastes electricity
24. 24.🤖 if (light < 200 OR motion) { porch lamp ON } else { porch lamp OFF }
    The light reading is 130 and motion is detected (true). What happens? (a) porch lamp ON (b) porch lamp OFF
25. 25.True or false: “the pump turns on” is the output. (a) False (b) True
26. 26.✏️ In a circuit diagram, wires are usually drawn as … (a) wavy lines (b) dotted circles (c) straight lines (d) little stars
27. 27.⚡ A device works on 24 V and takes 0.25 A. What is its power (in watts)? =
28. 28.🧩 A capacitor in a circuit can … (a) measure heat (b) store charge briefly (c) spin a wheel (d) make light
29. 29.What does a reed switch do? (a) slides side to side (b) stays where you flip it (c) closes near a magnet (d) springs back when let go
30. 30.🧮 A 5.5 V battery is joined to 3 Ω and 8 Ω resistors in series. What current flows (in amperes)? =
31. 31.🔋 On a cell, does “usually the red wire” mean the + end or the − end? (a) + (positive) (b) − (negative)
32. 32.💡 A battery lights 2 identical bulbs joined in series. One more identical bulb is added in series. How do the bulbs glow now? (a) brighter (b) the same (c) dimmer
33. 33.🔍 Which is the odd one out? (a) ignore update messages (b) log out of shared phones (c) post your live location (d) share camera links
34. 34.🔍 Which is the odd one out? (a) the fan starts (b) an alert on the phone (c) an LED lights up (d) compare with a limit
35. 35.🔦 A tester circuit has a new cell, a good bulb and wires with a gap between two clips. We put a glass marble across the gap. Does the bulb glow? (a) Yes (b) No
36. 36.Which of these means the circuit is closed? (a) a cell is taken out (b) a wire has come loose (c) all wires are joined (d) the switch is OFF
37. 37.💡 Old festival light strings went fully dark when one bulb failed. How were they joined? (a) in series (b) not joined (c) by Wi-Fi (d) in parallel
38. 38.⚡ Which formula gives electric power? (a) P = V + I (b) P = V ÷ I (c) P = I ÷ V (d) P = V × I
39. 39.🔁 What does a variable do in a program? (a) joins two wires (b) blinks an LED (c) measures light (d) stores a value
40. 40.✏️ In a circuit diagram, which part is drawn as a plain rectangle? (a) resistor (b) wire (c) ammeter (d) voltmeter

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