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Electronics Worksheet: Final Test

Electronics lesson 30: Final electronics test · Set 276 · 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.🔌 Is a motion sensor an input or an output for a microcontroller? (a) output (b) input
  2. 2.📏 In the water-pipe picture of a circuit, voltage is like … (a) the water tank lid (b) the pipe colour (c) the water pressure (d) the tap handle
  3. 3.🧮 Two resistors in parallel give a total that is … (a) always zero (b) more than either one (c) their sum (d) less than either one
  4. 4.🌈 In the resistor colour code, which number does grey stand for?
  5. 5.🌈 A resistor has the colour bands orange, brown, orange. What is its value (in ohms)?
  6. 6.🔁 total = 0
    for i = 1 to 10 { total = total + i }
    What is total at the end?
  7. 7.⚠️ A cell gets hot when its + and − ends are joined by a bare wire. What is this called? (a) a parallel circuit (b) a safe circuit (c) an open circuit (d) a short circuit
  8. 8.💡 A battery lights 2 identical bulbs joined in series. One more identical bulb is added in series. How do the bulbs glow now? (a) the same (b) dimmer (c) brighter
  9. 9.⚠️ What protects home wiring by melting or tripping when too much current flows? (a) a bulb (b) a plug top (c) a long wire (d) a fuse or MCB
  10. 10.🔺 An 8 V supply is joined across an 8 Ω resistor. What current flows (in amperes)? =
  11. 11.Which of these is true of a series circuit? (a) one out, the rest glow (b) used in house wiring (c) each gets the full volts (d) one bulb out, all go out
  12. 12.⏱️ loop forever { LED ON; wait 150 ms; LED OFF; wait 100 ms }
    How many times does the LED blink in 4 seconds?
  13. 13.⚠️ Who should be with you when you build a circuit? (a) a younger child (b) nobody (c) a trusted adult (d) a stranger online
  14. 14.⏱️ loop forever { LED ON; wait 700 ms; LED OFF; wait 1300 ms }
    How many times does the LED blink in 10 seconds?
  15. 15.🔢 To plan an electronics project, which comes first: “test it and fix it” or “build it with an adult”? (a) test it and fix it (b) build it with an adult
  16. 16.Which of these is an input? (a) a buzzer (b) a speaker (c) a motor (d) a sound sensor
  17. 17.Which of these means the circuit is open? (a) the switch is ON (b) all wires are joined (c) the loop is complete (d) the bulb is unscrewed
  18. 18.🔺 A current of 0.2 A flows when 1.6 V is joined across a resistor. What is its resistance (in ohms)?
  19. 19.🔌 Most metals are good … (a) insulators (b) batteries (c) magnets only (d) conductors
  20. 20.🔦 A tester circuit has a new cell, a good bulb and wires with a gap between two clips. We put a steel coin across the gap. Does the bulb glow? (a) Yes (b) No
  21. 21.⚠️ Is it safe to stop if a part gets hot? (a) safe (b) not safe
  22. 22.⚡ Which formula gives electric power? (a) P = V ÷ I (b) P = V + I (c) P = V × I (d) P = I ÷ V
  23. 23.🗺️ In an input → process → output plan, is “the pump turns on” the input, the process or the output? (a) input (b) process (c) output
  24. 24.🧾 A 250 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
  25. 25.🔗 Series or parallel circuit: “bulbs share the voltage”? (a) parallel (b) series
  26. 26.True or false: a toggle switch closes when tipped over. (a) False (b) True
  27. 27.🔺 A current of 40 mA flows through a 250 Ω resistor. What is the voltage across it (in volts)? =
  28. 28.🌈 Which band is read first on a resistor? (a) the widest gap (b) any band (c) the one nearest an end (d) the gold band
  29. 29.True or false: to read app permissions is a risky habit. (a) False (b) True
  30. 30.Which of these mainly gives out light? (a) a school bell (b) a tube light (c) an electric iron (d) an electric toy car
  31. 31.True or false: on a cell, “the flat end” means the − (negative) end. (a) False (b) True
  32. 32.🤖 if (distance < 15) { buzzer beeps } else { buzzer is silent }
    The distance sensor reads 11 cm. What happens?     (a) buzzer is silent (b) buzzer beeps
  33. 33.🔗 Series or parallel circuit: “each gets the full volts”? (a) series (b) parallel
  34. 34.🧮 Adding another resistor in series makes the total resistance … (a) stay the same (b) bigger (c) zero (d) smaller
  35. 35.💡 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
  36. 36.🔌 Is a servo motor an input or an output for a microcontroller? (a) output (b) input
  37. 37.🔺 A current of 20 mA flows through a 250 Ω resistor. What is the voltage across it (in volts)? =
  38. 38.✏️ In a circuit diagram, which part is drawn as a small empty box? (a) ammeter (b) bulb (c) resistor (d) LED
  39. 39.🌈 In the resistor colour code, which number does blue stand for?
  40. 40.🧮 Five equal 500 Ω resistors are joined in parallel. What is the total resistance (in ohms)?

Answer key

  1. input
  2. the water pressure
  3. less than either one
  4. 8
  5. 31000
  6. 55
  7. a short circuit
  8. dimmer
  9. a fuse or MCB
  10. 1
  11. one bulb out, all go out
  12. 16
  13. a trusted adult
  14. 5
  15. build it with an adult
  16. a sound sensor
  17. the bulb is unscrewed
  18. 8
  19. conductors
  20. Yes
  21. safe
  22. P = V × I
  23. output
  24. 1.5
  25. series
  26. False
  27. 10
  28. the one nearest an end
  29. False
  30. a tube light
  31. True
  32. buzzer beeps
  33. parallel
  34. bigger
  35. they keep glowing
  36. output
  37. 5
  38. resistor
  39. 6
  40. 100

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