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Electronics Worksheet: Final Test

Electronics lesson 30: Final electronics test · Set 43 · 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.

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  1. 1.True or false: “used in house wiring” is true of a parallel circuit. (a) False (b) True
  2. 2.Which of these is true of a series circuit? (a) used in house wiring (b) each gets the full volts (c) one bulb out, all go out (d) many paths for current
  3. 3.🔘 A bulb and a cell are joined through 3 switches on 3 side-by-side paths, one switch on each path (parallel). What is the smallest number of switches that must be ON to light the bulb?
  4. 4.📏 Which unit measures voltage? (a) volt (V) (b) ampere (A) (c) ohm (Ω) (d) watt (W)
  5. 5.🔺 A current of 10 mA flows through a 120 Ω resistor. What is the voltage across it (in volts)? =
  6. 6.🔁 count = 10
    repeat 2 times { count = count + 4 }
    What is count at the end?
  7. 7.🔐 Is it a good or a risky habit to set up with a parent? (a) risky habit (b) good habit
  8. 8.💡 An LED (with its resistor) is on pin 7. All pins start LOW. The program runs once:
    set pin 7 HIGH
    set pin 8 HIGH
    set pin 7 LOW
    set pin 8 LOW
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  9. 9.🔺 In the V-I-R triangle, how do we find V? (a) V = R ÷ I (b) V = I + R (c) V = I ÷ R (d) V = I × R
  10. 10.⚡ A device works on 12 V and takes 2 A. What is its power (in watts)? =
  11. 11.Which of these is the process? (a) a temperature reading (b) a soil moisture reading (c) check if temp > 30 (d) an LED lights up
  12. 12.True or false: to close a window in rain, use a rain sensor. (a) False (b) True
  13. 13.🔍 Which is the odd one out? (a) a street light (b) an electric kettle (c) a water heater (d) an electric iron
  14. 14.🌈 In the resistor colour code, which number does grey stand for?
  15. 15.True or false: an LED lamp mainly makes sound. (a) True (b) False
  16. 16.Which of these mainly gives out light? (a) an LED lamp (b) an electric iron (c) a ceiling fan (d) a siren
  17. 17.🔦 A circuit has a new cell, a good bulb and a switch that is ON. All the wires are firmly joined. Does the bulb glow? (a) No (b) Yes
  18. 18.True or false: a wooden stick is a conductor. (a) False (b) True
  19. 19.🔌 Is a servo motor an input or an output for a microcontroller? (a) input (b) output
  20. 20.What does a slide switch do? (a) flips up or down (b) closes near a magnet (c) stays where you flip it (d) slides side to side
  21. 21.💡 5 identical bulbs are joined in parallel across a 1.5 V battery (ideal wires). How many volts does each bulb get? =
  22. 22.Which job needs an LED? (a) turn to an exact angle (b) show the temperature (c) show a status light (d) open a gate to 90°
  23. 23.💡 What does LED stand for? (a) low energy device (b) light energy dial (c) light-emitting diode (d) large electric dial
  24. 24.💡 Why is house wiring done in parallel? (a) each gets full voltage (b) to make bulbs dim (c) to save copper only (d) so all go off together
  25. 25.True or false: “one bulb out, all go out” is true of a series circuit. (a) True (b) False
  26. 26.True or false: a microcontroller needs much more power. (a) False (b) True
  27. 27.🔺 A current of 0.25 A flows when 0.5 V is joined across a resistor. What is its resistance (in ohms)?
  28. 28.🔺 A current of 1.5 A flows when 15 V is joined across a resistor. What is its resistance (in ohms)?
  29. 29.🗺️ In an input → process → output plan, is “the fan starts” the input, the process or the output? (a) input (b) output (c) process
  30. 30.True or false: to post your live location is a good habit. (a) True (b) False
  31. 31.🔁 Is the circuit closed or open if a wire is cut? (a) open (b) closed
  32. 32.True or false: to change default passwords is a good habit. (a) True (b) False
  33. 33.🔋 3 identical 1.2 V cells are joined side by side in parallel (all + ends together, all − ends together). What is the voltage across them (in volts)? =
  34. 34.🔺 A 13.2 V supply is joined across a 330 Ω resistor. What current flows (in milliamperes, mA)?
  35. 35.Which of these mainly gives out heat? (a) a room heater (b) an electric toy car (c) a night lamp (d) a tube light
  36. 36.🤖 if (temperature > 31) { show “Hot” } else if (temperature > 25) { show “Warm” } else { show “Cool” }
    The temperature is 23 °C. What is shown?     (a) Hot (b) Cool (c) Warm
  37. 37.True or false: a spinning top usually has a microcontroller inside. (a) False (b) True
  38. 38.🔺 The voltage stays the same and the resistance gets bigger. The current … (a) becomes zero (b) stays the same (c) gets bigger (d) gets smaller
  39. 39.🔺 A 1.2 V supply is joined across a 6 Ω resistor. What current flows (in amperes)? =
  40. 40.Which of these gives us electricity? (a) an air conditioner (b) a solar panel (c) a washing machine (d) a computer

Answer key

  1. True
  2. one bulb out, all go out
  3. 1
  4. volt (V)
  5. 1.2
  6. 18
  7. good habit
  8. OFF
  9. V = I × R
  10. 24
  11. check if temp > 30
  12. True
  13. a street light
  14. 8
  15. False
  16. an LED lamp
  17. Yes
  18. False
  19. output
  20. slides side to side
  21. 1.5
  22. show a status light
  23. light-emitting diode
  24. each gets full voltage
  25. True
  26. False
  27. 2
  28. 10
  29. output
  30. False
  31. open
  32. True
  33. 1.2
  34. 40
  35. a room heater
  36. Cool
  37. False
  38. gets smaller
  39. 0.2
  40. a solar panel

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