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Electronics Worksheet: Final Test

Electronics lesson 30: Final electronics test · Set 928 · 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.

NameDateTime takenScore ___ / 40
  1. 1.⚡ A home appliance on the 230 V mains takes 1.5 A. What is its power (in watts)?
  2. 2.🔐 Is it a good or a risky habit to set up with a parent? (a) good habit (b) risky habit
  3. 3.True or false: “a single current path” is true of a series circuit. (a) True (b) False
  4. 4.⏱️ How many milliseconds is a wait of 4.2 seconds?
  5. 5.🤖 Does a toy robot usually have a microcontroller inside? (a) Yes (b) No
  6. 6.🔺 A current of 20 mA flows when 4 V is joined across a resistor. What is its resistance (in ohms)?
  7. 7.🌈 A resistor has the colour bands violet, violet, orange. What is its value (in ohms)?
  8. 8.💡 Does it save or waste electricity to set the AC to 24 °C? (a) wastes electricity (b) saves electricity
  9. 9.🌈 A resistor has the colour bands red, brown, red. What is its value in kilo-ohms (kΩ)? =
  10. 10.📶 A pin that reads a push button is set as … (a) a battery (b) an output (c) a resistor (d) an input
  11. 11.🔺 In the V-I-R triangle, how do we find R? (a) R = V ÷ I (b) R = V + I (c) R = V × I (d) R = I ÷ V
  12. 12.🔁 count = 1
    while (count < 26) { count = count + 5 }
    How many times does the loop run?
  13. 13.🔍 Which is the odd one out? (a) log out of shared phones (b) post your live location (c) share camera links (d) share the Wi-Fi key
  14. 14.True or false: a water heater mainly gives out light. (a) True (b) False
  15. 15.🧾 A 200 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
  16. 16.⚡ What does an electric toy car mainly change electricity into? (a) light (b) heat (c) sound (d) movement
  17. 17.📶 Digital or analog: a door: open or shut? (a) analog (b) digital
  18. 18.🌐 Each reading a sensor sends is 20 bytes. How many bytes do 70 readings take?
  19. 19.True or false: a buzzer makes a beeping sound. (a) False (b) True
  20. 20.🔺 A current of 0.1 A flows through a 10 Ω resistor. What is the voltage across it (in volts)? =
  21. 21.🔁 Is the circuit closed or open if the switch is ON? (a) open (b) closed
  22. 22.True or false: to use small battery cells is not safe. (a) True (b) False
  23. 23.🔘 What does a switch do in a circuit? (a) changes the voltage (b) makes electricity (c) stores current (d) opens or closes the loop
  24. 24.True or false: a washing machine usually has a microcontroller inside. (a) False (b) True
  25. 25.🧮 An 8 V battery is joined to 5 Ω and 3 Ω resistors in series. What current flows (in amperes)? =
  26. 26.Which of these is true of a series circuit? (a) one out, the rest glow (b) own switch for each bulb (c) used in house wiring (d) a single current path
  27. 27.True or false: the voltmeter is joined in series. (a) True (b) False
  28. 28.🔌 Is an iron nail a conductor or an insulator? (a) an insulator (b) a conductor
  29. 29.True or false: “a break stops every bulb” is true of a parallel circuit. (a) True (b) False
  30. 30.True or false: an electric iron mainly gives out light. (a) False (b) True
  31. 31.📏 Which unit measures resistance? (a) ohm (Ω) (b) watt (W) (c) volt (V) (d) ampere (A)
  32. 32.Which of these is not safe? (a) take cells out after use (b) dry your hands first (c) stay away from pylons (d) open a phone charger
  33. 33.True or false: a circle with a cross is the symbol for a bulb. (a) False (b) True
  34. 34.🔗 Series or parallel circuit: “own switch for each bulb”? (a) series (b) parallel
  35. 35.🔌 Is a motor an input or an output for a microcontroller? (a) input (b) output
  36. 36.💡 A battery lights 5 identical bulbs joined in parallel. One more identical bulb is added in parallel. How do the bulbs glow now? (a) brighter (b) dimmer (c) the same
  37. 37.💡 In a series circuit, how many paths does the current have? (a) none (b) one for each bulb (c) one (d) two
  38. 38.🔁 What does a variable do in a program? (a) measures light (b) stores a value (c) joins two wires (d) blinks an LED
  39. 39.🔘 Which kind of switch closes near a magnet? (a) a push button (b) a reed switch (c) a tilt switch (d) a slide switch
  40. 40.🔘 When a switch is ON, the circuit is … (a) broken (b) cut (c) open (d) closed

Answer key

  1. 345
  2. good habit
  3. True
  4. 4200
  5. Yes
  6. 200
  7. 77000
  8. saves electricity
  9. 2.1
  10. an input
  11. R = V ÷ I
  12. 5
  13. log out of shared phones
  14. False
  15. 1
  16. movement
  17. digital
  18. 1400
  19. True
  20. 1
  21. closed
  22. False
  23. opens or closes the loop
  24. True
  25. 1
  26. a single current path
  27. False
  28. a conductor
  29. False
  30. False
  31. ohm (Ω)
  32. open a phone charger
  33. True
  34. parallel
  35. output
  36. the same
  37. one
  38. stores a value
  39. a reed switch
  40. closed

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