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Electronics Worksheet: Final Test

Electronics lesson 30: Final electronics test · Set 55 · 40 questions
TalentJR

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.

NameDateTime takenScore ___ / 40
  1. 1.True or false: a circle with an X in it is the symbol for a bulb. (a) False (b) True
  2. 2.Which of these is a good habit? (a) tap unknown app links (b) share the Wi-Fi key (c) set a strong password (d) share camera links
  3. 3.🔺 The voltage stays the same and the resistance gets bigger. The current … (a) gets bigger (b) becomes zero (c) gets smaller (d) stays the same
  4. 4.🔁 total = 0
    for i = 1 to 12 { total = total + i }
    What is total at the end?
  5. 5.🔌 Is a servo motor an input or an output for a microcontroller? (a) output (b) input
  6. 6.🔋 How many 2 V cells must be joined in series to give 8 V?
  7. 7.True or false: a thermistor senses how bright it is. (a) True (b) False
  8. 8.✏️ In a circuit diagram, which part is drawn as two or more cell symbols? (a) resistor (b) wire (c) battery (d) diode
  9. 9.🔢 To run one loop of a plant-watering program, what comes right after “switch the pump on/off”? (a) read the soil sensor (b) compare with the limit (c) wait a few seconds
  10. 10.🔺 A current of 25 mA flows through a 330 Ω resistor. What is the voltage across it (in volts)? =
  11. 11.🔘 Which kind of switch springs back when let go? (a) a tilt switch (b) a reed switch (c) a push button (d) a slide switch
  12. 12.True or false: to post your live location is a good habit. (a) False (b) True
  13. 13.🔐 Why install updates on IoT devices? (a) they fix security holes (b) they delete the Wi-Fi (c) they make it heavier (d) they change the colour
  14. 14.⚡ Which formula gives electric power? (a) P = V ÷ I (b) P = V × I (c) P = V + I (d) P = I ÷ V
  15. 15.💡 Does it save or waste electricity to use old filament bulbs? (a) wastes electricity (b) saves electricity
  16. 16.True or false: to spot someone walking in, use a distance sensor. (a) True (b) False
  17. 17.⚡ A home appliance on the 230 V mains takes 0.5 A. What is its power (in watts)?
  18. 18.🔘 A cell and a bulb are joined to 2 side-by-side paths with one switch on each path — A and B (parallel). A is OFF and B is ON. Does the bulb glow? (a) No (b) Yes
  19. 19.Which of these means the circuit is open? (a) a wire is cut (b) all wires are joined (c) the switch is ON (d) the loop is complete
  20. 20.🔁 What does “count = count + 1” do? (a) prints 1 (b) takes 1 away (c) adds 1 to count (d) sets count to 1
  21. 21.⚡ A 72 W device works on 24 V. What current does it take (in amperes)? =
  22. 22.🔌 Is a wooden stick a conductor or an insulator? (a) a conductor (b) an insulator
  23. 23.🔍 Which is the odd one out? (a) a brass key (b) a plastic ruler (c) a rubber eraser (d) a cotton thread
  24. 24.⚡ A bicycle dynamo changes which kind of energy into electricity? (a) chemical energy (b) light energy (c) sound energy (d) movement energy
  25. 25.✏️ Why do engineers draw circuits with symbols? (a) quick and clear for all (b) to hide the circuit (c) symbols are heavier (d) to make it colourful
  26. 26.🌈 Which colour bands (1st digit, 2nd digit, multiplier) mark an 86000 Ω resistor? (a) grey-blue-orange (b) grey-blue-red (c) blue-grey-orange (d) grey-blue-yellow
  27. 27.🔌 Which part of a screwdriver should an electrician hold? (a) the steel shaft (b) the bare end (c) the metal tip (d) the plastic handle
  28. 28.⚙️ Which actuator would you use to spin a robot’s wheels? (a) a servo motor (b) a pump (c) an LED (d) a motor
  29. 29.🔐 Is it a good or a risky habit to share only needed data? (a) good habit (b) risky habit
  30. 30.Which of these saves electricity? (a) leave the TV on standby (b) run fans in empty rooms (c) close the fridge quickly (d) use old filament bulbs
  31. 31.True or false: “an alert on the phone” is the input. (a) False (b) True
  32. 32.🔌 Is a ceramic cup a conductor or an insulator? (a) a conductor (b) an insulator
  33. 33.True or false: “bulbs share the voltage” is true of a series circuit. (a) True (b) False
  34. 34.Which of these saves electricity? (a) leave the TV on standby (b) use old filament bulbs (c) leave fridge door open (d) use daylight to read
  35. 35.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 3 hours. How many watt-hours (Wh) are saved?
  36. 36.📏 Which unit measures voltage? (a) watt (W) (b) ohm (Ω) (c) volt (V) (d) ampere (A)
  37. 37.🔍 Which is the odd one out? (a) a wooden stick (b) a paper strip (c) a rubber eraser (d) a safety pin
  38. 38.🔍 Which is the odd one out? (a) a temperature sensor (b) a buzzer (c) a push button (d) a motion sensor
  39. 39.💡 In a parallel circuit, one bulb breaks. What happens to the others? (a) they explode (b) they get dimmer (c) they keep glowing (d) they all go out
  40. 40.True or false: how much a part resists is measured in ohms (Ω). (a) False (b) True

Answer key

  1. True
  2. set a strong password
  3. gets smaller
  4. 78
  5. output
  6. 4
  7. False
  8. battery
  9. wait a few seconds
  10. 8.25
  11. a push button
  12. False
  13. they fix security holes
  14. P = V × I
  15. wastes electricity
  16. False
  17. 115
  18. Yes
  19. a wire is cut
  20. adds 1 to count
  21. 3
  22. an insulator
  23. a brass key
  24. movement energy
  25. quick and clear for all
  26. grey-blue-orange
  27. the plastic handle
  28. a motor
  29. good habit
  30. close the fridge quickly
  31. False
  32. an insulator
  33. True
  34. use daylight to read
  35. 255
  36. volt (V)
  37. a safety pin
  38. a buzzer
  39. they keep glowing
  40. True

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