Electronics Worksheet: Final Test

Electronics lesson 30: Final electronics test · Set 305 · 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.🧮 Adding another resistor in series makes the total resistance … (a) stay the same (b) smaller (c) bigger (d) zero
2. 2.🔐 Why install updates on IoT devices? (a) they make it heavier (b) they delete the Wi-Fi (c) they fix security holes (d) they change the colour
3. 3.💡 On an LED, is the leg by the flat edge the anode (+) or the cathode (−)? (a) anode (+) (b) cathode (−)
4. 4.What does a toggle switch do? (a) springs back when let go (b) closes when tipped over (c) stays where you flip it (d) closes near a magnet
5. 5.True or false: “a temperature reading” is the process. (a) True (b) False
6. 6.Which of these mainly gives out heat? (a) a doorbell (b) a tube light (c) an electric kettle (d) an electric toy car
7. 7.🔁 What does a variable do in a program? (a) stores a value (b) measures light (c) blinks an LED (d) joins two wires
8. 8.True or false: a circle with A inside is the symbol for an ammeter. (a) True (b) False
9. 9.🤖 if (light < 400 OR motion) { porch lamp ON } else { porch lamp OFF }
   The light reading is 290 and motion is not detected (false). What happens? (a) porch lamp OFF (b) porch lamp ON
10. 10.🔐 Is it a good or a risky habit to share only needed data? (a) good habit (b) risky habit
11. 11.🔌 Is a dry cork a conductor or an insulator? (a) an insulator (b) a conductor
12. 12.💡 Why is house wiring done in parallel? (a) to make bulbs dim (b) each gets full voltage (c) so all go off together (d) to save copper only
13. 13.🔐 Privacy for a smart device means controlling … (a) its colour (b) its battery size (c) who can see your data (d) how loud it beeps
14. 14.🔦 A tester circuit has a new cell, a good bulb and wires with a gap between two clips. We put a rubber eraser across the gap. Does the bulb glow? (a) Yes (b) No
15. 15.True or false: the voltmeter measures voltage. (a) False (b) True
16. 16.🔺 In the V-I-R triangle, how do we find R? (a) R = V ÷ I (b) R = V × I (c) R = V + I (d) R = I ÷ V
17. 17.⚠️ Is it safe to climb an electric pole? (a) safe (b) not safe
18. 18.🔌 Is a motor an input or an output for a microcontroller? (a) output (b) input
19. 19.📶 How many states can a digital pin have? (a) ten (b) two (c) one (d) a thousand
20. 20.📶 Digital or analog: a button: pressed or not? (a) analog (b) digital
21. 21.🔘 Two switches are in series. When does the bulb glow? (a) when either is ON (b) never (c) when both are OFF (d) when both are ON
22. 22.True or false: on an LED, the round-side leg is the cathode (−). (a) True (b) False
23. 23.🔺 A current of 0.2 A flows through a 15 Ω resistor. What is the voltage across it (in volts)? =
24. 24.✏️ In a circuit diagram, which part is drawn as a circle with M inside? (a) LED (b) capacitor (c) motor (d) resistor
25. 25.🔘 Which kind of switch closes near a magnet? (a) a reed switch (b) a tilt switch (c) a toggle switch (d) a slide switch
26. 26.🔁 In an old-style bulb, which thin wire glows when current flows? (a) the filament (b) the switch (c) the glass (d) the base
27. 27.🔘 Which kind of switch stays where you flip it? (a) a toggle switch (b) a push button (c) a tilt switch (d) a slide switch
28. 28.True or false: “one bulb out, all go out” is true of a series circuit. (a) False (b) True
29. 29.Which of these uses electricity? (a) a bicycle dynamo (b) a computer (c) a power station (d) a solar panel
30. 30.🔋 On a cell, does “the end with a bump” mean the + end or the − end? (a) − (negative) (b) + (positive)
31. 31.🔁 repeat 3 times { repeat 4 times { beep } }
    How many beeps are there?
32. 32.True or false: a circle with A inside is the symbol for a bulb. (a) True (b) False
33. 33.Which of these is a conductor? (a) a copper wire (b) a plastic straw (c) a glass marble (d) a cotton thread
34. 34.🤖 if (light < 200 OR motion) { porch lamp ON } else { porch lamp OFF }
    The light reading is 240 and motion is not detected (false). What happens? (a) porch lamp OFF (b) porch lamp ON
35. 35.Which of these is safe? (a) touch a switch when wet (b) fly a kite near wires (c) take cells out after use (d) open a phone charger
36. 36.🔺 A 0.8 V supply is joined across a 4 Ω resistor. What current flows (in amperes)? =
37. 37.True or false: a torch mainly makes movement. (a) False (b) True
38. 38.🔋 4 identical 3 V cells are joined side by side in parallel (all + ends together, all − ends together). What is the voltage across them (in volts)? =
39. 39.Which of these mainly gives out light? (a) a mixer grinder (b) a torch (c) a room heater (d) a table fan
40. 40.💡 Old festival light strings went fully dark when one bulb failed. How were they joined? (a) in parallel (b) in series (c) by Wi-Fi (d) not joined

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