Electronics Worksheet: Final Test

Electronics lesson 30: Final electronics test · Set 411 · 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 get a sensor reading onto a phone, which is the FIRST step? (a) the app shows it (b) it is sent by Wi-Fi (c) the sensor measures (d) the board reads it
2. 2.True or false: on a cell, “the end with a bump” means the + (positive) end. (a) False (b) True
3. 3.🔁 In an old-style bulb, which thin wire glows when current flows? (a) the filament (b) the base (c) the glass (d) the switch
4. 4.🔍 Which sensor would you use to stop a robot near walls? (a) a light sensor (b) a distance sensor (c) a gas sensor (d) a sound sensor
5. 5.💡 3 identical bulbs are joined in series with a battery and a closed switch on the main wire. All the bulbs are in place. How many bulbs glow?
6. 6.🧩 Which component makes a beeping sound? (a) transistor (b) potentiometer (c) LDR (d) buzzer
7. 7.✏️ In a circuit diagram, which part is drawn as a straight line? (a) voltmeter (b) battery (c) bulb (d) wire
8. 8.🤖 if (temperature > 31) { show “Hot” } else if (temperature > 26) { show “Warm” } else { show “Cool” }
   The temperature is 19 °C. What is shown? (a) Warm (b) Cool (c) Hot
9. 9.💡 6 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. Bulb 5 is taken out of its holder. How many bulbs glow?
10. 10.📏 Which unit measures resistance? (a) ohm (Ω) (b) volt (V) (c) ampere (A) (d) watt (W)
11. 11.🔐 Is it a good or a risky habit to reuse one password? (a) good habit (b) risky habit
12. 12.True or false: “one bulb out, all go out” is true of a series circuit. (a) False (b) True
13. 13.🗺️ Before building a project, what should you write down first? (a) the final price (b) nothing at all (c) the box colour (d) inputs and outputs
14. 14.Which of these is an output? (a) a push button (b) a water pump (c) a light sensor (d) a motion sensor
15. 15.🔺 A current of 40 mA flows through a 500 Ω resistor. What is the voltage across it (in volts)? =
16. 16.🔘 A bulb and a cell are joined through 2 switches one after another in a single loop (series). What is the smallest number of switches that must be ON to light the bulb?
17. 17.💡 2 identical bulbs are joined in series with a 2 V battery (ideal wires). How many volts does each bulb get? =
18. 18.🔁 Is the circuit closed or open if all wires are joined? (a) open (b) closed
19. 19.🔋 A 6 V battery and four 1.5 V cells are joined in series, all facing the same way. What is the total voltage (in volts)? =
20. 20.💡 5 identical bulbs are joined in parallel across a 4.5 V battery (ideal wires). How many volts does each bulb get? =
21. 21.🧩 Which component beeps for an alarm? (a) fuse (b) diode (c) capacitor (d) buzzer
22. 22.Which of these is measured in amperes (A)? (a) energy used each second (b) the push of a cell (c) how much a part resists (d) the flow of charge
23. 23.💡 On an LED, is the leg by the flat edge the anode (+) or the cathode (−)? (a) anode (+) (b) cathode (−)
24. 24.🔐 A smart speaker is always listening for its wake word. What is a sensible habit? (a) put it in the bathroom (b) let strangers use it (c) mute it when not in use (d) tell it your passwords
25. 25.🔍 Which is the odd one out? (a) a dry cork (b) a copper wire (c) a ceramic cup (d) a plastic straw
26. 26.🔘 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 OFF and C is OFF. Does the bulb glow? (a) Yes (b) No
27. 27.🔢 To run one loop of a plant-watering program, which comes first: “compare with the limit” or “switch the pump on/off”? (a) switch the pump on/off (b) compare with the limit
28. 28.⚡ A bicycle dynamo changes which kind of energy into electricity? (a) chemical energy (b) movement energy (c) sound energy (d) light energy
29. 29.🤖 Microcontroller or laptop: which one runs one small program? (a) laptop (b) microcontroller
30. 30.💡 6 identical bulbs are joined in series with a battery and a closed switch on the main wire. Bulb 1 is taken out of its holder. Does bulb 5 glow? (a) Yes (b) No
31. 31.🔍 Which is the odd one out? (a) leave fridge door open (b) use daylight to read (c) unplug idle chargers (d) use LED lamps
32. 32.🔐 Who should decide which smart devices go in a child’s room? (a) the app’s adverts (b) an online stranger (c) nobody at all (d) a parent or guardian
33. 33.🤖 How does a new program get onto a microcontroller board? (a) typed on the chip (b) drawn with a pen (c) sent by sound (d) uploaded over USB
34. 34.🔘 Which kind of switch works only while pressed? (a) a reed switch (b) a tilt switch (c) a slide switch (d) a push button
35. 35.💡 Old festival light strings went fully dark when one bulb failed. How were they joined? (a) by Wi-Fi (b) not joined (c) in parallel (d) in series
36. 36.📏 Voltmeter or ammeter: which one measures voltage? (a) voltmeter (b) ammeter
37. 37.Which of these is safe? (a) stop if a part gets hot (b) touch a fallen wire (c) poke things in a socket (d) open a phone charger
38. 38.🔍 Which is the odd one out? (a) iron one shirt at a time (b) leave the TV on standby (c) use daylight to read (d) leave fridge door open
39. 39.Which of these means the circuit is open? (a) the switch is ON (b) all wires are joined (c) the loop is complete (d) a wire is cut
40. 40.✏️ In a circuit diagram, which part is drawn as a small empty box? (a) motor (b) switch (c) ammeter (d) resistor

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