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Electronics Worksheet: Final Test

Electronics lesson 30: Final electronics test · Set 130 · 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.🔋 Does a battery give electricity or use electricity? (a) uses electricity (b) gives electricity
  2. 2.Which of these means the circuit is open? (a) the switch is ON (b) the loop is complete (c) a wire has come loose (d) all wires are joined
  3. 3.🤖 if (temperature > 32) { show “Hot” } else if (temperature > 23) { show “Warm” } else { show “Cool” }
    The temperature is 45 °C. What is shown?     (a) Warm (b) Cool (c) Hot
  4. 4.💡 An LED is joined to a 6 V battery through a 330 Ω resistor; the leg next to the flat edge of its rim goes to the − side. What happens? (a) may burn out (b) lights up (c) does not light
  5. 5.Which of these uses electricity? (a) a cell (b) a washing machine (c) a generator (d) a power station
  6. 6.True or false: “bulbs share the voltage” is true of a series circuit. (a) False (b) True
  7. 7.🤖 if (temperature > 25) { fan ON } else { fan OFF }
    The temperature sensor reads 31 °C. What happens?     (a) fan OFF (b) fan ON
  8. 8.🔺 A current of 0.5 A flows through a 12 Ω resistor. What is the voltage across it (in volts)? =
  9. 9.🌈 A resistor has the colour bands grey, black, orange. What is its value in kilo-ohms (kΩ)? =
  10. 10.🔍 Which is the odd one out? (a) close the fridge quickly (b) switch off empty rooms (c) iron one shirt at a time (d) use LED lamps
  11. 11.🔺 A current of 2.5 A flows through a 3 Ω resistor. What is the voltage across it (in volts)? =
  12. 12.🔘 A cell, a bulb and switches A and B are joined one after another in a single loop (series). A is ON and B is OFF. Does the bulb glow? (a) Yes (b) No
  13. 13.🔁 count = 5
    while (count < 35) { count = count + 5 }
    How many times does the loop run?
  14. 14.🔺 In the V-I-R triangle, how do we find R? (a) R = V ÷ I (b) R = I ÷ V (c) R = V + I (d) R = V × I
  15. 15.⏱️ repeat 3 times { buzzer ON; wait 100 ms; buzzer OFF; wait 900 ms }
    How many milliseconds does this take in all?
  16. 16.Which of these is not safe? (a) dry your hands first (b) use mains for a project (c) use small battery cells (d) keep drinks far away
  17. 17.🔌 Which part of a screwdriver should an electrician hold? (a) the bare end (b) the plastic handle (c) the steel shaft (d) the metal tip
  18. 18.🔦 A tester circuit has a new cell, a good bulb and wires with a gap between two clips. We put a plastic ruler across the gap. Does the bulb glow? (a) No (b) Yes
  19. 19.🤖 Microcontroller or laptop: which one uses very little power? (a) microcontroller (b) laptop
  20. 20.True or false: current is measured in volts (V). (a) False (b) True
  21. 21.🧾 One “unit” on an electricity bill is … (a) 1 ampere (b) 1 kilowatt-hour (kWh) (c) 1 volt (d) 1 watt
  22. 22.🔁 count = 1
    repeat 6 times { count = count + 10 }
    What is count at the end?
  23. 23.Which of these is a conductor? (a) a woollen thread (b) a ceramic cup (c) a steel spoon (d) a cotton thread
  24. 24.🔍 Which is the odd one out? (a) a smart energy meter (b) a fitness band with app (c) a Wi-Fi weather station (d) a wind-up clock
  25. 25.🔘 Two switches are in parallel (side by side). When does the bulb glow? (a) never (b) only when both are OFF (c) only when both are ON (d) when either is ON
  26. 26.🧮 Two equal 200 Ω resistors are joined in parallel. What is the total resistance (in ohms)?
  27. 27.📏 How many kilo-ohms (kΩ) is 7000 Ω? =
  28. 28.🌈 A gold fourth band on a resistor means the value may be off by … (a) 5 % (b) 50 % (c) 25 % (d) 0 %
  29. 29.🧮 A 1.3 V battery is joined to 8 Ω and 5 Ω resistors in series. What current flows (in amperes)? =
  30. 30.💡 6 identical bulbs are in parallel and each one takes 1.5 A. What total current (in amperes) comes from the battery? =
  31. 31.🧮 Resistors of 68 Ω and 220 Ω are joined in series. What is the total resistance (in ohms)?
  32. 32.🔺 A 5 V supply is joined across a 250 Ω resistor. What current flows (in milliamperes, mA)?
  33. 33.📶 How many states can a digital pin have? (a) a thousand (b) ten (c) two (d) one
  34. 34.🔍 Which sensor would you use to spot someone walking in? (a) a soil moisture sensor (b) a motion sensor (c) a gas sensor (d) a temperature sensor
  35. 35.True or false: the ammeter is joined across a part. (a) True (b) False
  36. 36.🔺 A 0.8 V supply is joined across a 4 Ω resistor. What current flows (in amperes)? =
  37. 37.True or false: if the switch is OFF, the circuit is closed and current flows. (a) False (b) True
  38. 38.🔍 For a microcontroller, is a sensor an input or an output? (a) an input (b) an output (c) a fuse (d) a power source
  39. 39.📏 How many ohms (Ω) is 7.3 kΩ?
  40. 40.Which drawing is the symbol for a cell? (a) one tall, one short bar (b) a circle with M inside (c) two or more cell symbols (d) a circle with a cross

Answer key

  1. gives electricity
  2. a wire has come loose
  3. Hot
  4. lights up
  5. a washing machine
  6. True
  7. fan ON
  8. 6
  9. 80
  10. iron one shirt at a time
  11. 7.5
  12. No
  13. 6
  14. R = V ÷ I
  15. 3000
  16. use mains for a project
  17. the plastic handle
  18. No
  19. microcontroller
  20. False
  21. 1 kilowatt-hour (kWh)
  22. 61
  23. a steel spoon
  24. a wind-up clock
  25. when either is ON
  26. 100
  27. 7
  28. 5 %
  29. 0.1
  30. 9
  31. 288
  32. 20
  33. two
  34. a motion sensor
  35. False
  36. 0.2
  37. False
  38. an input
  39. 7300
  40. one tall, one short bar

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