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Electronics Worksheet: Final Test

Electronics lesson 30: Final electronics test · Set 826 · 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.🧩 Which part changes electrical energy into movement? (a) a motor (b) an LED (c) a resistor (d) a fuse
  2. 2.🤖 if (moisture < 50) { pump ON } else { pump OFF }
    The soil moisture sensor reads 63 %. What happens?     (a) pump OFF (b) pump ON
  3. 3.⏱️ What does “wait 500 ms” do? (a) pauses for half a second (b) waits 500 seconds (c) blinks 500 times (d) turns the LED off
  4. 4.⚡ A device works on 6 V and takes 0.25 A. What is its power (in watts)? =
  5. 5.✏️ In a cell symbol, which line is the + terminal? (a) the shorter line (b) both lines (c) neither line (d) the longer line
  6. 6.🔦 A tester circuit has a new cell, a good bulb and wires with a gap between two clips. We put a rubber band across the gap. Does the bulb glow? (a) No (b) Yes
  7. 7.🔺 In the V-I-R triangle, how do we find R? (a) R = V + I (b) R = V × I (c) R = V ÷ I (d) R = I ÷ V
  8. 8.🔁 count = 4
    repeat 2 times { count = count + 7 }
    What is count at the end?
  9. 9.💡 An LED (with its resistor) is on pin 7. All pins start LOW. The program runs once:
    set pin 8 HIGH
    set pin 8 LOW
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  10. 10.⚡ A home appliance on the 230 V mains takes 4 A. What is its power (in watts)?
  11. 11.True or false: a toaster mainly gives out heat. (a) True (b) False
  12. 12.🧭 Which part of a microcontroller board keeps the voltage steady? (a) the voltage regulator (b) the power LED (c) the USB port (d) the reset button
  13. 13.⚠️ Who should be with you when you build a circuit? (a) nobody (b) a trusted adult (c) a stranger online (d) a younger child
  14. 14.⚠️ Is it safe to use a cable with cuts? (a) safe (b) not safe
  15. 15.True or false: to set the AC to 24 °C wastes electricity. (a) True (b) False
  16. 16.🔺 A current of 1 A flows when 2 V is joined across a resistor. What is its resistance (in ohms)?
  17. 17.🌐 Each reading a sensor sends is 20 bytes. How many bytes do 70 readings take?
  18. 18.⚠️ Is it safe to touch a switch when wet? (a) safe (b) not safe
  19. 19.🔁 repeat 5 times { repeat 3 times { beep } }
    How many beeps are there?
  20. 20.🔍 Which is the odd one out? (a) a motion sensor (b) a speaker (c) a servo motor (d) a motor
  21. 21.✏️ In a circuit diagram, which part is drawn as two equal parallel lines? (a) LED (b) capacitor (c) diode (d) cell
  22. 22.💡 In a parallel circuit, one bulb breaks. What happens to the others? (a) they get dimmer (b) they all go out (c) they keep glowing (d) they explode
  23. 23.⚡ Power tells us … (a) the length of a wire (b) the size of a cell (c) the colour of light (d) energy used each second
  24. 24.🤖 if (light < 400 AND motion) { porch lamp ON } else { porch lamp OFF }
    The light reading is 370 and motion is detected (true). What happens?     (a) porch lamp OFF (b) porch lamp ON
  25. 25.⏱️ How many milliseconds are in 1 second? (a) 10 (b) 100 (c) 60 (d) 1000
  26. 26.🔺 A current of 40 mA flows through a 470 Ω resistor. What is the voltage across it (in volts)? =
  27. 27.Which drawing is the symbol for a junction? (a) a straight line (b) a dot where wires meet (c) two or more cell symbols (d) a circle with a cross
  28. 28.🧾 One “unit” on an electricity bill is … (a) 1 watt (b) 1 ampere (c) 1 volt (d) 1 kilowatt-hour (kWh)
  29. 29.True or false: a reed switch closes near a magnet. (a) False (b) True
  30. 30.🤖 if (light < 200 AND motion) { porch lamp ON } else { porch lamp OFF }
    The light reading is 350 and motion is not detected (false). What happens?     (a) porch lamp ON (b) porch lamp OFF
  31. 31.True or false: if the bulb is unscrewed, the circuit is closed and current flows. (a) True (b) False
  32. 32.🔘 Which kind of switch slides side to side? (a) a reed switch (b) a tilt switch (c) a push button (d) a slide switch
  33. 33.🔋 What should you do with used-up cells? (a) give them for recycling (b) cut them open (c) throw them in a fire (d) bury them in soil
  34. 34.True or false: to cover unused cameras is a good habit. (a) True (b) False
  35. 35.True or false: a rice cooker mainly makes sound. (a) False (b) True
  36. 36.🌈 Which band is read first on a resistor? (a) the widest gap (b) the one nearest an end (c) the gold band (d) any band
  37. 37.💡 A battery lights 5 identical bulbs joined in series. One more identical bulb is added in series. How do the bulbs glow now? (a) the same (b) brighter (c) dimmer
  38. 38.Which of these is a conductor? (a) a brass key (b) a glass marble (c) a ceramic cup (d) a rubber eraser
  39. 39.Which of these is true of a series circuit? (a) one out, the rest glow (b) one bulb out, all go out (c) many paths for current (d) each gets the full volts
  40. 40.🔋 Does a wind turbine give electricity or use electricity? (a) uses electricity (b) gives electricity

Answer key

  1. a motor
  2. pump OFF
  3. pauses for half a second
  4. 1.5
  5. the longer line
  6. No
  7. R = V ÷ I
  8. 18
  9. OFF
  10. 920
  11. True
  12. the voltage regulator
  13. a trusted adult
  14. not safe
  15. False
  16. 2
  17. 1400
  18. not safe
  19. 15
  20. a motion sensor
  21. capacitor
  22. they keep glowing
  23. energy used each second
  24. porch lamp ON
  25. 1000
  26. 18.8
  27. a dot where wires meet
  28. 1 kilowatt-hour (kWh)
  29. True
  30. porch lamp OFF
  31. False
  32. a slide switch
  33. give them for recycling
  34. True
  35. False
  36. the one nearest an end
  37. dimmer
  38. a brass key
  39. one bulb out, all go out
  40. gives electricity

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