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Electronics Worksheet: Final Test

Electronics lesson 30: Final electronics test · Set 497 · 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.⏱️ How many milliseconds are in 1 second? (a) 1000 (b) 10 (c) 100 (d) 60
  2. 2.🌈 A resistor has the colour bands blue, black, orange. What is its value (in ohms)?
  3. 3.💡 A battery lights 3 identical bulbs joined in series. One more identical bulb is added in series. How do the bulbs glow now? (a) brighter (b) dimmer (c) the same
  4. 4.🔍 Which is the odd one out? (a) an electric iron (b) an electric kettle (c) a doorbell (d) a rice cooker
  5. 5.⚡ A 0.3 W device works on 3 V. What current does it take (in amperes)? =
  6. 6.🔦 A tester circuit has a new cell, a good bulb and wires with a gap between two clips. We put a safety pin across the gap. Does the bulb glow? (a) No (b) Yes
  7. 7.🔘 A cell, a bulb and switches A and B are joined one after another in a single loop (series). A is OFF and B is ON. Does the bulb glow? (a) No (b) Yes
  8. 8.💡 4 identical bulbs are joined in series with a 10 V battery (ideal wires). How many volts does each bulb get? =
  9. 9.🌈 In the resistor colour code, which number does red stand for?
  10. 10.True or false: “many paths for current” is true of a series circuit. (a) True (b) False
  11. 11.🌈 A gold fourth band on a resistor means the value may be off by … (a) 50 % (b) 5 % (c) 25 % (d) 0 %
  12. 12.🧭 Which part of a microcontroller board shows the board is on? (a) the power LED (b) the pins (c) the USB port (d) the main chip
  13. 13.🔺 The voltage stays the same and the resistance gets bigger. The current … (a) gets smaller (b) gets bigger (c) becomes zero (d) stays the same
  14. 14.📶 A pin set LOW gives about … (a) 9 V (b) 0 V (c) 1.5 V (d) 5 V
  15. 15.Which of these is an input? (a) a buzzer (b) a small display (c) a speaker (d) a sound sensor
  16. 16.⚡ A home appliance on the 230 V mains takes 10 A. What is its power (in watts)?
  17. 17.🔍 Which sensor would you use to switch on with a clap? (a) a rain sensor (b) a sound sensor (c) a distance sensor (d) a light sensor
  18. 18.🧮 Three equal 30 Ω resistors are joined in parallel. What is the total resistance (in ohms)?
  19. 19.Which of these is an output? (a) a light sensor (b) a sound sensor (c) a push button (d) an LED
  20. 20.Which of these uses electricity? (a) a television (b) a wind turbine (c) a battery (d) a bicycle dynamo
  21. 21.🔺 A 37.5 V supply is joined across a 15 Ω resistor. What current flows (in amperes)? =
  22. 22.🔍 Which is the odd one out? (a) stop if a part gets hot (b) touch a switch when wet (c) open a phone charger (d) throw cells in a fire
  23. 23.🔍 Which is the odd one out? (a) a smart energy meter (b) a Wi-Fi weather station (c) an app-controlled bulb (d) a paper calendar
  24. 24.🔍 Which sensor would you use to start a fan when hot? (a) a temperature sensor (b) a gas sensor (c) a light sensor (d) a motion sensor
  25. 25.⚠️ Is it safe to fly kites in open fields? (a) not safe (b) safe
  26. 26.🔐 Is it a good or a risky habit to install software updates? (a) good habit (b) risky habit
  27. 27.✏️ In a circuit diagram, which part is drawn as two equal parallel lines? (a) capacitor (b) switch (c) bulb (d) voltmeter
  28. 28.True or false: on an LED, the longer leg is the anode (+). (a) False (b) True
  29. 29.🔺 A current of 2.5 A flows through a 2 Ω resistor. What is the voltage across it (in volts)? =
  30. 30.⚡ A 3 W device works on 1.5 V. What current does it take (in amperes)? =
  31. 31.🔍 Which sensor would you use to close a window in rain? (a) a sound sensor (b) a temperature sensor (c) a distance sensor (d) a rain sensor
  32. 32.True or false: “a single current path” is true of a parallel circuit. (a) False (b) True
  33. 33.Which of these is not safe? (a) keep drinks far away (b) build with an adult near (c) fly a kite near wires (d) fly kites in open fields
  34. 34.🔍 Which is the odd one out? (a) use old filament bulbs (b) leave the TV on standby (c) leave fridge door open (d) set the AC to 24 °C
  35. 35.🧾 A 500 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
  36. 36.🔺 A current of 40 mA flows through a 330 Ω resistor. What is the voltage across it (in volts)? =
  37. 37.Which of these is a risky habit? (a) share only needed data (b) set up with a parent (c) turn off unused gadgets (d) keep factory passwords
  38. 38.⚡ A solar panel changes which kind of energy into electricity? (a) chemical energy (b) wind energy (c) sound energy (d) light energy
  39. 39.💡 A red LED uses 2 V and should get 10 mA. It runs from a 5 V supply. What resistor (in ohms) is needed in series?
  40. 40.🗺️ In an input → process → output plan, is “an LED lights up” the input, the process or the output? (a) input (b) process (c) output

Answer key

  1. 1000
  2. 60000
  3. dimmer
  4. a doorbell
  5. 0.1
  6. Yes
  7. No
  8. 2.5
  9. 2
  10. False
  11. 5 %
  12. the power LED
  13. gets smaller
  14. 0 V
  15. a sound sensor
  16. 2300
  17. a sound sensor
  18. 10
  19. an LED
  20. a television
  21. 2.5
  22. stop if a part gets hot
  23. a paper calendar
  24. a temperature sensor
  25. safe
  26. good habit
  27. capacitor
  28. True
  29. 5
  30. 2
  31. a rain sensor
  32. False
  33. fly a kite near wires
  34. set the AC to 24 °C
  35. 1
  36. 13.2
  37. keep factory passwords
  38. light energy
  39. 300
  40. output

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