Electronics Worksheet: Final Test

Electronics lesson 30: Final electronics test · Set 905 · 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.🧩 A capacitor in a circuit can … (a) measure heat (b) spin a wheel (c) make light (d) store charge briefly
2. 2.🤖 if (light < 200) { lamp ON } else { lamp OFF }
   The light sensor reads 300. What happens? (a) lamp ON (b) lamp OFF
3. 3.🔌 Is a rubber band a conductor or an insulator? (a) a conductor (b) an insulator
4. 4.🔺 A current of 20 mA flows through a 150 Ω resistor. What is the voltage across it (in volts)? =
5. 5.🔍 Which is the odd one out? (a) an LED (b) a temperature sensor (c) a motion sensor (d) a turning knob
6. 6.🔢 To run one loop of a plant-watering program, what comes right after “compare with the limit”? (a) read the soil sensor (b) wait a few seconds (c) switch the pump on/off
7. 7.Which job needs a temperature sensor? (a) spot someone walking in (b) start a fan when hot (c) stop a robot near walls (d) close a window in rain
8. 8.🔌 Is a cotton thread a conductor or an insulator? (a) a conductor (b) an insulator
9. 9.🧾 A 200 W appliance runs for 10 hours. How many units (kWh) of electricity does it use? =
10. 10.⚙️ What is an actuator? (a) a sensor (b) a battery (c) an output that acts (d) a program
11. 11.🔁 What does a variable do in a program? (a) stores a value (b) blinks an LED (c) measures light (d) joins two wires
12. 12.What does a potentiometer do? (a) is a resistance knob (b) makes a beeping sound (c) senses how bright it is (d) limits the current
13. 13.True or false: “a break stops every bulb” is true of a series circuit. (a) False (b) True
14. 14.⏱️ A program says “wait 3000 ms”. How many seconds is that? =
15. 15.🔗 Series or parallel circuit: “many paths for current”? (a) series (b) parallel
16. 16.🤖 if (light < 300) { lamp ON } else { lamp OFF }
    The light sensor reads 391. What happens? (a) lamp OFF (b) lamp ON
17. 17.✏️ In a cell symbol, which line is the + terminal? (a) the shorter line (b) neither line (c) both lines (d) the longer line
18. 18.🧮 A 0.8 V battery is joined to 3 Ω and 5 Ω resistors in series. What current flows (in amperes)? =
19. 19.🔍 Which is the odd one out? (a) a school bell (b) a tube light (c) a loudspeaker (d) a buzzer
20. 20.⚡ Which formula gives electric power? (a) P = I ÷ V (b) P = V + I (c) P = V ÷ I (d) P = V × I
21. 21.🔋 On a cell, does “the shorter symbol line” mean the + end or the − end? (a) − (negative) (b) + (positive)
22. 22.🤖 Where does the board keep its program when the power is off? (a) the power LED (b) flash memory (c) the resistor (d) the USB cable
23. 23.True or false: the voltmeter is joined across a part. (a) True (b) False
24. 24.🧾 One “unit” on an electricity bill is … (a) 1 ampere (b) 1 watt (c) 1 kilowatt-hour (kWh) (d) 1 volt
25. 25.⚡ A bicycle dynamo changes which kind of energy into electricity? (a) sound energy (b) chemical energy (c) movement energy (d) light energy
26. 26.🗺️ In an input → process → output plan, is “the pump turns on” the input, the process or the output? (a) output (b) input (c) process
27. 27.Which drawing is the symbol for a resistor? (a) a plain rectangle (b) two or more cell symbols (c) triangle, bar and arrows (d) a long and a short line
28. 28.🔺 The voltage stays the same and the resistance gets bigger. The current … (a) stays the same (b) becomes zero (c) gets bigger (d) gets smaller
29. 29.🔘 Which kind of switch springs back when let go? (a) a toggle switch (b) a reed switch (c) a tilt switch (d) a push button
30. 30.🔍 Which is the odd one out? (a) use LED lamps (b) iron one shirt at a time (c) use old filament bulbs (d) leave fridge door open
31. 31.True or false: to share camera links is a risky habit. (a) False (b) True
32. 32.Which of these means the circuit is open? (a) a wire has come loose (b) the switch is ON (c) all wires are joined (d) the loop is complete
33. 33.🔍 For a microcontroller, is a sensor an input or an output? (a) an input (b) an output (c) a power source (d) a fuse
34. 34.🔦 A tester circuit has a new cell, a good bulb and wires with a gap between two clips. We put a steel coin across the gap. Does the bulb glow? (a) Yes (b) No
35. 35.🔋 On a cell, does “usually the red wire” mean the + end or the − end? (a) − (negative) (b) + (positive)
36. 36.Which of these uses electricity? (a) a solar panel (b) a power station (c) a computer (d) a generator
37. 37.🔺 A current of 10 mA flows when 3 V is joined across a resistor. What is its resistance (in ohms)?
38. 38.Which of these is an output? (a) a temperature sensor (b) a motion sensor (c) a push button (d) a water pump
39. 39.Which job needs a temperature sensor? (a) warn of a gas leak (b) measure classroom noise (c) switch on lamps at dusk (d) keep an incubator warm
40. 40.🗺️ In an input → process → output plan, is “a button press” the input, the process or the output? (a) input (b) process (c) output

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