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Electronics Worksheet: Final Test

Electronics lesson 30: Final electronics test · Set 419 · 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.⏱️ How many milliseconds are in 1 second? (a) 10 (b) 1000 (c) 100 (d) 60
  2. 2.Which of these uses electricity? (a) a power station (b) a battery (c) a washing machine (d) a bicycle dynamo
  3. 3.💡 In a series circuit, how many paths does the current have? (a) one for each bulb (b) two (c) none (d) one
  4. 4.🌐 In an IoT system, which part carries the data? (a) sensor (b) cloud server (c) microcontroller (d) Wi-Fi
  5. 5.🔁 count = 5
    repeat 10 times { count = count + 8 }
    What is count at the end?
  6. 6.🔺 A current of 50 mA flows when 11 V is joined across a resistor. What is its resistance (in ohms)?
  7. 7.🔺 A current of 0.5 A flows when 7.5 V is joined across a resistor. What is its resistance (in ohms)?
  8. 8.💡 On an LED, is the longer leg the anode (+) or the cathode (−)? (a) cathode (−) (b) anode (+)
  9. 9.✏️ In a circuit diagram, which part is drawn as a circle with an X in it? (a) diode (b) capacitor (c) voltmeter (d) bulb
  10. 10.🔺 A 20 V supply is joined across a 500 Ω resistor. What current flows (in milliamperes, mA)?
  11. 11.🔺 A current of 10 mA flows through a 150 Ω resistor. What is the voltage across it (in volts)? =
  12. 12.Which of these uses electricity? (a) a generator (b) a bicycle dynamo (c) a mobile phone (d) a wind turbine
  13. 13.Which of these is a conductor? (a) a ceramic cup (b) a glass marble (c) a plastic straw (d) a steel coin
  14. 14.🔺 A 45 V supply is joined across a 15 Ω resistor. What current flows (in amperes)? =
  15. 15.⚡ A device works on 24 V and takes 3 A. What is its power (in watts)? =
  16. 16.True or false: a push button works only while pressed. (a) False (b) True
  17. 17.True or false: “used in house wiring” is true of a parallel circuit. (a) False (b) True
  18. 18.💡 On an LED, is the round-side leg the anode (+) or the cathode (−)? (a) cathode (−) (b) anode (+)
  19. 19.🌈 Which colour bands (1st digit, 2nd digit, multiplier) mark a 100 Ω resistor? (a) brown-black-brown (b) brown-black-black (c) red-brown-brown (d) brown-black-red
  20. 20.🧩 Which component stores a little charge? (a) potentiometer (b) diode (c) fuse (d) capacitor
  21. 21.🧩 A capacitor in a circuit can … (a) measure heat (b) spin a wheel (c) store charge briefly (d) make light
  22. 22.🔁 x = 5
    repeat 1 time { x = x × 2 }
    What is x at the end?
  23. 23.🔺 The voltage stays the same and the resistance gets bigger. The current … (a) stays the same (b) gets smaller (c) becomes zero (d) gets bigger
  24. 24.Which of these is the process? (a) a light level reading (b) the pump turns on (c) a motion sensor signal (d) count button presses
  25. 25.True or false: “a single current path” is true of a series circuit. (a) True (b) False
  26. 26.🌈 A gold fourth band on a resistor means the value may be off by … (a) 25 % (b) 5 % (c) 50 % (d) 0 %
  27. 27.🤖 Does a smart watch usually have a microcontroller inside? (a) No (b) Yes
  28. 28.Which of these is true of a parallel circuit? (a) one bulb out, all go out (b) many paths for current (c) bulbs share the voltage (d) a break stops every bulb
  29. 29.🔦 A circuit has a new cell, a good bulb and a switch that is ON. All the wires are firmly joined. A gap in one wire is bridged by an iron nail. Does the bulb glow? (a) No (b) Yes
  30. 30.🧮 Two resistors in parallel give a total that is … (a) their sum (b) more than either one (c) always zero (d) less than either one
  31. 31.🔍 Which is the odd one out? (a) leave the TV on standby (b) run fans in empty rooms (c) use LED lamps (d) leave fridge door open
  32. 32.🔌 Is a steel spoon a conductor or an insulator? (a) a conductor (b) an insulator
  33. 33.💡 Does it save or waste electricity to unplug idle chargers? (a) wastes electricity (b) saves electricity
  34. 34.True or false: a bicycle bell usually has a microcontroller inside. (a) False (b) True
  35. 35.⚡ Which tiny particles drift along a metal wire to carry the current? (a) water drops (b) photons (c) dust particles (d) electrons
  36. 36.💡 Old festival light strings went fully dark when one bulb failed. How were they joined? (a) in series (b) in parallel (c) not joined (d) by Wi-Fi
  37. 37.🔐 Is it a good or a risky habit to read app permissions? (a) risky habit (b) good habit
  38. 38.What does the Wi-Fi link do? (a) reads values, decides (b) acts on a command (c) carries the data (d) measures the real world
  39. 39.⚠️ Who should be with you when you build a circuit? (a) nobody (b) a younger child (c) a stranger online (d) a trusted adult
  40. 40.⚡ A fan changes electrical energy mainly into which kind of energy? (a) movement energy (b) sound energy (c) light energy (d) chemical energy

Answer key

  1. 1000
  2. a washing machine
  3. one
  4. Wi-Fi
  5. 85
  6. 220
  7. 15
  8. anode (+)
  9. bulb
  10. 40
  11. 1.5
  12. a mobile phone
  13. a steel coin
  14. 3
  15. 72
  16. True
  17. True
  18. anode (+)
  19. brown-black-brown
  20. capacitor
  21. store charge briefly
  22. 10
  23. gets smaller
  24. count button presses
  25. True
  26. 5 %
  27. Yes
  28. many paths for current
  29. Yes
  30. less than either one
  31. use LED lamps
  32. a conductor
  33. saves electricity
  34. False
  35. electrons
  36. in series
  37. good habit
  38. carries the data
  39. a trusted adult
  40. movement energy

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