← Final electronics test lesson New set →

Electronics Worksheet: Final Test

Electronics lesson 30: Final electronics test · Set 4 · 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.🔦 A tester circuit has a new cell, a good bulb and wires with a gap between two clips. We put a steel spoon across the gap. Does the bulb glow? (a) Yes (b) No
  2. 2.What does an LED do? (a) smooths a wobbly supply (b) glows using little power (c) beeps for an alarm (d) stores a little charge
  3. 3.⏱️ How many milliseconds are in 1 second? (a) 10 (b) 60 (c) 100 (d) 1000
  4. 4.True or false: to change default passwords is a risky habit. (a) False (b) True
  5. 5.True or false: “check if temp > 30” is the process. (a) False (b) True
  6. 6.What does the phone app do? (a) stores data online (b) reads values, decides (c) shows data to you (d) measures the real world
  7. 7.🔁 Is the circuit closed or open if a cell is taken out? (a) open (b) closed
  8. 8.📶 On a 5 V board, a pin set HIGH gives about … (a) 0 V (b) 50 V (c) 230 V (d) 5 V
  9. 9.True or false: to use daylight to read wastes electricity. (a) True (b) False
  10. 10.🤖 if (temperature > 35) { show “Hot” } else if (temperature > 18) { show “Warm” } else { show “Cool” }
    The temperature is 39 °C. What is shown?     (a) Hot (b) Warm (c) Cool
  11. 11.✏️ Why do engineers draw circuits with symbols? (a) to hide the circuit (b) to make it colourful (c) symbols are heavier (d) quick and clear for all
  12. 12.💡 On an LED, is the longer leg the anode (+) or the cathode (−)? (a) anode (+) (b) cathode (−)
  13. 13.🔍 Which is the odd one out? (a) a toaster (b) an electric iron (c) a night lamp (d) a room heater
  14. 14.🔍 Which is the odd one out? (a) set up with a parent (b) share camera links (c) post your live location (d) keep factory passwords
  15. 15.🧮 Adding another resistor in series makes the total resistance … (a) stay the same (b) bigger (c) zero (d) smaller
  16. 16.Which of these is not an IoT device? (a) an app-controlled bulb (b) a smart energy meter (c) a Wi-Fi doorbell camera (d) a wind-up clock
  17. 17.🔋 Does an air conditioner give electricity or use electricity? (a) gives electricity (b) uses electricity
  18. 18.🔋 Identical cells side by side (in parallel) give … (a) the same voltage (b) double the voltage (c) no voltage (d) half the voltage
  19. 19.🌈 A resistor has the colour bands brown, orange, orange. What is its value (in ohms)?
  20. 20.🤖 Microcontroller or laptop: which one needs much more power? (a) laptop (b) microcontroller
  21. 21.🌈 Which colour bands (1st digit, 2nd digit, multiplier) mark a 1000 Ω resistor? (a) brown-black-orange (b) brown-black-brown (c) red-brown-red (d) brown-black-red
  22. 22.🔍 Which is the odd one out? (a) a glass marble (b) a copper wire (c) a woollen thread (d) a cotton thread
  23. 23.🔌 Is a metal paper clip a conductor or an insulator? (a) a conductor (b) an insulator
  24. 24.🔁 Is the circuit closed or open if the switch is ON? (a) open (b) closed
  25. 25.True or false: if the switch is ON, the circuit is closed and current flows. (a) False (b) True
  26. 26.🔺 A current of 40 mA flows when 8.8 V is joined across a resistor. What is its resistance (in ohms)?
  27. 27.⚡ An 18 W device works on 12 V. What current does it take (in amperes)? =
  28. 28.⏱️ loop forever { LED ON; wait 250 ms; LED OFF; wait 150 ms }
    How many times does the LED blink in 6 seconds?
  29. 29.🌐 Is a pencil sharpener an IoT device? (a) not an IoT device (b) an IoT device
  30. 30.🌐 In an IoT system, which part shows data to you? (a) sensor (b) microcontroller (c) actuator (d) phone app
  31. 31.🔁 total = 0
    for i = 1 to 3 { total = total + i }
    What is total at the end?
  32. 32.🔍 Which is the odd one out? (a) post your live location (b) share the Wi-Fi key (c) ignore update messages (d) change default passwords
  33. 33.⏱️ What does “wait 500 ms” do? (a) turns the LED off (b) waits 500 seconds (c) pauses for half a second (d) blinks 500 times
  34. 34.True or false: “one bulb out, all go out” is true of a series circuit. (a) False (b) True
  35. 35.True or false: a plain wall switch has no microcontroller inside. (a) False (b) True
  36. 36.🤖 if (temperature > 31) { show “Hot” } else if (temperature > 23) { show “Warm” } else { show “Cool” }
    The temperature is 31 °C. What is shown?     (a) Hot (b) Cool (c) Warm
  37. 37.Which drawing is the symbol for a motor? (a) a circle with A inside (b) a long and a short line (c) a small empty box (d) a circle with M inside
  38. 38.💡 Old festival light strings went fully dark when one bulb failed. How were they joined? (a) in parallel (b) not joined (c) in series (d) by Wi-Fi
  39. 39.True or false: a circle with an X in it is the symbol for a cell. (a) False (b) True
  40. 40.True or false: resistance is measured in amperes (A). (a) True (b) False

Answer key

  1. Yes
  2. glows using little power
  3. 1000
  4. False
  5. True
  6. shows data to you
  7. open
  8. 5 V
  9. False
  10. Hot
  11. quick and clear for all
  12. anode (+)
  13. a night lamp
  14. set up with a parent
  15. bigger
  16. a wind-up clock
  17. uses electricity
  18. the same voltage
  19. 13000
  20. laptop
  21. brown-black-red
  22. a copper wire
  23. a conductor
  24. closed
  25. True
  26. 220
  27. 1.5
  28. 15
  29. not an IoT device
  30. phone app
  31. 6
  32. change default passwords
  33. pauses for half a second
  34. True
  35. True
  36. Warm
  37. a circle with M inside
  38. in series
  39. False
  40. False

Free electronics lessons, practice and worksheets at talentjr.in/electronics-for-kids