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Electronics Worksheet: Final Test

Electronics lesson 30: Final electronics test · Set 699 · 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 glass marble a conductor or an insulator? (a) an insulator (b) a conductor
  2. 2.True or false: to reuse one password is a good habit. (a) True (b) False
  3. 3.💡 Does it save or waste electricity to use daylight to read? (a) wastes electricity (b) saves electricity
  4. 4.🌐 A weather station sends one reading every 15 seconds. How many readings does it send in 9 minutes?
  5. 5.🔋 What should you do with used-up cells? (a) cut them open (b) bury them in soil (c) give them for recycling (d) throw them in a fire
  6. 6.🔘 A cell and a bulb are joined to two side-by-side paths: path 1 has switches A and B one after another, path 2 has switch C. A is OFF, B is OFF and C is OFF. Does the bulb glow? (a) No (b) Yes
  7. 7.🌈 A resistor has the colour bands red, violet, red. What is its value in kilo-ohms (kΩ)? =
  8. 8.🔌 Is a dry cork a conductor or an insulator? (a) an insulator (b) a conductor
  9. 9.🤖 Microcontroller or laptop: which one needs much more power? (a) microcontroller (b) laptop
  10. 10.⏱️ loop forever { LED ON; wait 150 ms; LED OFF; wait 50 ms }
    How many times does the LED blink in 1 second?
  11. 11.🔘 A cell and a bulb are joined to two side-by-side paths: path 1 has switches A and B one after another, path 2 has switch C. A is OFF, B is ON and C is OFF. Does the bulb glow? (a) No (b) Yes
  12. 12.✏️ In a circuit diagram, wires are usually drawn as … (a) straight lines (b) dotted circles (c) wavy lines (d) little stars
  13. 13.🌈 Which colour bands (1st digit, 2nd digit, multiplier) mark a 320 Ω resistor? (a) orange-red-black (b) red-orange-brown (c) orange-red-red (d) orange-red-brown
  14. 14.🤖 if (temperature > 25) { fan ON } else { fan OFF }
    The temperature sensor reads 24 °C. What happens?     (a) fan ON (b) fan OFF
  15. 15.🧩 Which part changes electrical energy into sound? (a) a resistor (b) a capacitor (c) a diode (d) a buzzer
  16. 16.What does a tilt switch do? (a) slides side to side (b) closes when tipped over (c) works only while pressed (d) closes near a magnet
  17. 17.🔺 A 12 V supply is joined across a 12 Ω resistor. What current flows (in amperes)? =
  18. 18.🗺️ In an input → process → output plan, is “a motion sensor signal” the input, the process or the output? (a) input (b) output (c) process
  19. 19.🤖 Microcontroller or laptop: which one runs many apps at once? (a) laptop (b) microcontroller
  20. 20.🧾 A 500 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
  21. 21.🧮 Five equal 250 Ω resistors are joined in parallel. What is the total resistance (in ohms)?
  22. 22.🧮 Five equal 500 Ω resistors are joined in parallel. What is the total resistance (in ohms)?
  23. 23.🔁 count = 0
    repeat 2 times { count = count + 2 }
    What is count at the end?
  24. 24.🌐 A soil sensor sends a reading to an app every 5 minutes. How many readings arrive in 4 hours?
  25. 25.True or false: a digital alarm clock has no microcontroller inside. (a) False (b) True
  26. 26.🧩 Which part changes electrical energy into movement? (a) a fuse (b) a resistor (c) an LED (d) a motor
  27. 27.Which of these is a risky habit? (a) cover unused cameras (b) turn off unused gadgets (c) share only needed data (d) accept every permission
  28. 28.📶 Digital or analog: many values in a range? (a) digital (b) analog
  29. 29.⚡ Power tells us … (a) the colour of light (b) the length of a wire (c) the size of a cell (d) energy used each second
  30. 30.🔋 6 identical 1.5 V cells are joined in series, but one of them is put in the wrong way round. What is the total voltage now (in volts)? =
  31. 31.✏️ In a circuit diagram, which part is drawn as a small empty box? (a) ammeter (b) resistor (c) diode (d) wire
  32. 32.🔍 Which is the odd one out? (a) a wooden stick (b) a graphite rod (c) a rubber band (d) a plastic ruler
  33. 33.🔗 Series or parallel circuit: “used in house wiring”? (a) series (b) parallel
  34. 34.🔁 count = 5
    while (count < 20) { count = count + 3 }
    How many times does the loop run?
  35. 35.🧩 Which component is a resistance knob? (a) thermistor (b) resistor (c) diode (d) potentiometer
  36. 36.🗺️ In an input → process → output plan, is “the pump turns on” the input, the process or the output? (a) process (b) output (c) input
  37. 37.What does a thermistor do? (a) senses how hot it is (b) limits the current (c) stores a little charge (d) is a resistance knob
  38. 38.🔦 A circuit has a used-up (dead) cell, a good bulb and a switch that is ON. All the wires are firmly joined. Does the bulb glow? (a) Yes (b) No
  39. 39.🧩 Which component makes a beeping sound? (a) fuse (b) thermistor (c) potentiometer (d) buzzer
  40. 40.Which of these means the circuit is closed? (a) a wire is cut (b) the switch is OFF (c) the switch is ON (d) a wire has come loose

Answer key

  1. an insulator
  2. False
  3. saves electricity
  4. 36
  5. give them for recycling
  6. No
  7. 2.7
  8. an insulator
  9. laptop
  10. 5
  11. No
  12. straight lines
  13. orange-red-brown
  14. fan OFF
  15. a buzzer
  16. closes when tipped over
  17. 1
  18. input
  19. laptop
  20. 2
  21. 50
  22. 100
  23. 4
  24. 48
  25. False
  26. a motor
  27. accept every permission
  28. analog
  29. energy used each second
  30. 6
  31. resistor
  32. a graphite rod
  33. parallel
  34. 5
  35. potentiometer
  36. output
  37. senses how hot it is
  38. No
  39. buzzer
  40. the switch is ON

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