Electronics Worksheet: Final Test

Electronics lesson 30: Final electronics test · Set 154 · 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 is the odd one out? (a) a woollen thread (b) a glass marble (c) a steel spoon (d) a rubber band
2. 2.⏱️ How many milliseconds are in 1 second? (a) 1000 (b) 10 (c) 100 (d) 60
3. 3.🔘 Which kind of switch flips up or down? (a) a push button (b) a tilt switch (c) a toggle switch (d) a slide switch
4. 4.🔘 Two switches are in parallel (side by side). When does the bulb glow? (a) only when both are ON (b) only when both are OFF (c) never (d) when either is ON
5. 5.🌈 Which band is read first on a resistor? (a) the one nearest an end (b) the gold band (c) the widest gap (d) any band
6. 6.💡 An LED (with its resistor) is on pin 8. All pins start LOW. The program runs once:
   set pin 7 LOW
   set pin 8 LOW
   set pin 8 LOW
   set pin 7 LOW
   set pin 7 HIGH
   Is the LED ON or OFF at the end? (a) OFF (b) ON
7. 7.🧮 Adding another resistor in series makes the total resistance … (a) zero (b) stay the same (c) smaller (d) bigger
8. 8.💡 2 identical bulbs are joined in series with a 3 V battery (ideal wires). How many volts does each bulb get? =
9. 9.🔢 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
10. 10.🔁 count = 2
    while (count < 14) { count = count + 2 }
    How many times does the loop run?
11. 11.🧾 Which lamp gives the same light for the least power? (a) an oil lamp (b) an LED lamp (c) a filament bulb (d) a candle
12. 12.🤖 if (light < 200 AND motion) { porch lamp ON } else { porch lamp OFF }
    The light reading is 560 and motion is not detected (false). What happens? (a) porch lamp ON (b) porch lamp OFF
13. 13.🔺 A current of 3 A flows when 24 V is joined across a resistor. What is its resistance (in ohms)?
14. 14.True or false: a washing machine usually has a microcontroller inside. (a) True (b) False
15. 15.True or false: a smart watch usually has a microcontroller inside. (a) False (b) True
16. 16.💡 A battery lights 2 identical bulbs joined in parallel. One more identical bulb is added in parallel. How do the bulbs glow now? (a) the same (b) dimmer (c) brighter
17. 17.True or false: a push button closes near a magnet. (a) True (b) False
18. 18.Which of these is true of a parallel circuit? (a) a single current path (b) a break stops every bulb (c) each gets the full volts (d) one bulb out, all go out
19. 19.🔘 When a switch is ON, the circuit is … (a) cut (b) open (c) broken (d) closed
20. 20.🌈 A gold fourth band on a resistor means the value may be off by … (a) 0 % (b) 5 % (c) 25 % (d) 50 %
21. 21.🔺 A current of 50 mA flows through a 500 Ω resistor. What is the voltage across it (in volts)? =
22. 22.📶 Digital or analog: a tilt switch: on or off? (a) analog (b) digital
23. 23.Which drawing is the symbol for a capacitor? (a) two equal parallel lines (b) a circle with V inside (c) many long-short pairs (d) a circle with a cross
24. 24.🔋 How many 3 V cells must be joined in series to give 6 V?
25. 25.True or false: the ammeter is joined in series. (a) True (b) False
26. 26.True or false: to cover unused cameras is a good habit. (a) True (b) False
27. 27.Which of these is an insulator? (a) a copper wire (b) a metal paper clip (c) a steel spoon (d) a plastic ruler
28. 28.True or false: on a cell, “the end with a bump” means the + (positive) end. (a) True (b) False
29. 29.💡 An LED is joined to a 9 V battery through a 1000 Ω resistor; the leg next to the flat edge of its rim goes to the + side. What happens? (a) lights up (b) does not light (c) may burn out
30. 30.💡 A battery lights 5 identical bulbs joined in parallel. One more identical bulb is added in parallel. How do the bulbs glow now? (a) the same (b) dimmer (c) brighter
31. 31.🔁 count = 3
    while (count < 13) { count = count + 2 }
    How many times does the loop run?
32. 32.True or false: to set a strong password is a risky habit. (a) False (b) True
33. 33.⚙️ Which actuator would you use to spin a robot’s wheels? (a) a servo motor (b) an LED (c) a display (d) a motor
34. 34.🗺️ In “input → process → output”, which part is the decision the program makes? (a) the battery (b) the input (c) the process (d) the output
35. 35.🔐 Is it a good or a risky habit to tap unknown app links? (a) good habit (b) risky habit
36. 36.Which of these is a conductor? (a) a dry cork (b) a woollen thread (c) an iron nail (d) a glass marble
37. 37.True or false: “one bulb out, all go out” is true of a parallel circuit. (a) True (b) False
38. 38.True or false: a toy robot has no microcontroller inside. (a) False (b) True
39. 39.🔍 Which is the odd one out? (a) a soil moisture reading (b) check if temp > 30 (c) a motion sensor signal (d) a button press
40. 40.💡 4 identical bulbs are joined in series with a 4 V battery (ideal wires). How many volts does each bulb get? =

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