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Electronics Worksheet: Final Test

Electronics lesson 30: Final electronics test · Set 462 · 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.🧩 Which part changes electrical energy into movement? (a) a motor (b) a fuse (c) a resistor (d) an LED
  2. 2.🔺 The voltage stays the same and the resistance gets bigger. The current … (a) gets bigger (b) gets smaller (c) becomes zero (d) stays the same
  3. 3.🌐 A soil sensor sends a reading to an app every 30 minutes. How many readings arrive in 4 hours?
  4. 4.⚠️ About how many volts do home sockets in India supply? (a) 12 V (b) 9 V (c) 1.5 V (d) 230 V
  5. 5.Which of these is a good habit? (a) change default passwords (b) post your live location (c) ignore update messages (d) accept every permission
  6. 6.🧩 Which component turns a fan or wheels? (a) resistor (b) transistor (c) motor (d) diode
  7. 7.⚡ What does an electric iron mainly change electricity into? (a) movement (b) light (c) sound (d) heat
  8. 8.🔋 How many 1.2 V cells must be joined in series to give 7.2 V?
  9. 9.🤖 Microcontroller or laptop: which one needs much more power? (a) laptop (b) microcontroller
  10. 10.🔁 Is the circuit closed or open if the switch is ON? (a) open (b) closed
  11. 11.True or false: a straight line is the symbol for a switch. (a) True (b) False
  12. 12.🔁 What must there be for a current to flow? (a) a complete loop (b) a broken path (c) a plastic gap (d) one loose end
  13. 13.🤖 if (light < 400 AND motion) { porch lamp ON } else { porch lamp OFF }
    The light reading is 200 and motion is not detected (false). What happens?     (a) porch lamp OFF (b) porch lamp ON
  14. 14.True or false: a motor turns a fan or wheels. (a) True (b) False
  15. 15.🔺 A current of 0.1 A flows when 0.3 V is joined across a resistor. What is its resistance (in ohms)?
  16. 16.Which of these means the circuit is open? (a) a wire has come loose (b) all wires are joined (c) the switch is ON (d) the loop is complete
  17. 17.📏 How many ohms (Ω) is 0.7 kΩ?
  18. 18.Which of these means the circuit is closed? (a) the bulb is unscrewed (b) the switch is OFF (c) a wire has come loose (d) the loop is complete
  19. 19.⏱️ A program says “wait 6250 ms”. How many seconds is that? =
  20. 20.True or false: a motor limits the current. (a) True (b) False
  21. 21.🤖 if (temperature > 34) { show “Hot” } else if (temperature > 20) { show “Warm” } else { show “Cool” }
    The temperature is 30 °C. What is shown?     (a) Cool (b) Hot (c) Warm
  22. 22.🤖 if (light < 200 OR motion) { porch lamp ON } else { porch lamp OFF }
    The light reading is 330 and motion is not detected (false). What happens?     (a) porch lamp OFF (b) porch lamp ON
  23. 23.🌈 A resistor has the colour bands green, grey, orange. What is its value in kilo-ohms (kΩ)? =
  24. 24.Which of these is measured in volts (V)? (a) the push of a cell (b) energy used each second (c) resistance (d) current
  25. 25.Which job needs a servo motor? (a) beep an alarm (b) spin a robot’s wheels (c) move water to plants (d) open a gate to 90°
  26. 26.🔺 A current of 50 mA flows through a 100 Ω resistor. What is the voltage across it (in volts)? =
  27. 27.True or false: a washing machine has no microcontroller inside. (a) False (b) True
  28. 28.🔦 A circuit has a new cell, a good bulb and a switch that is ON. All the wires are firmly joined. A gap in one wire is bridged by a plastic straw. Does the bulb glow? (a) Yes (b) No
  29. 29.🔋 How many 1.2 V cells must be joined in series to give 2.4 V?
  30. 30.True or false: a long and a short line is the symbol for a bulb. (a) False (b) True
  31. 31.🔍 Which is the odd one out? (a) a brass key (b) a graphite rod (c) a glass marble (d) a steel coin
  32. 32.✏️ In a circuit diagram, which part is drawn as two or more cell symbols? (a) capacitor (b) voltmeter (c) battery (d) cell
  33. 33.🌈 A resistor has the colour bands red, red, black. What is its value (in ohms)?
  34. 34.🔁 count = 2
    while (count < 34) { count = count + 4 }
    How many times does the loop run?
  35. 35.⚡ A solar panel changes which kind of energy into electricity? (a) sound energy (b) chemical energy (c) light energy (d) wind energy
  36. 36.Which of these mainly gives out heat? (a) a tube light (b) a buzzer (c) an electric kettle (d) a mixer grinder
  37. 37.True or false: on an LED, the leg by the flat edge is the cathode (−). (a) False (b) True
  38. 38.🤖 if (light < 400 AND motion) { porch lamp ON } else { porch lamp OFF }
    The light reading is 320 and motion is detected (true). What happens?     (a) porch lamp OFF (b) porch lamp ON
  39. 39.🗺️ Before building a project, what should you write down first? (a) inputs and outputs (b) the box colour (c) nothing at all (d) the final price
  40. 40.⚡ A device works on 24 V and takes 2 A. What is its power (in watts)? =

Answer key

  1. a motor
  2. gets smaller
  3. 8
  4. 230 V
  5. change default passwords
  6. motor
  7. heat
  8. 6
  9. laptop
  10. closed
  11. False
  12. a complete loop
  13. porch lamp OFF
  14. True
  15. 3
  16. a wire has come loose
  17. 700
  18. the loop is complete
  19. 6.25
  20. False
  21. Warm
  22. porch lamp OFF
  23. 58
  24. the push of a cell
  25. open a gate to 90°
  26. 5
  27. False
  28. No
  29. 2
  30. False
  31. a glass marble
  32. battery
  33. 22
  34. 8
  35. light energy
  36. an electric kettle
  37. True
  38. porch lamp ON
  39. inputs and outputs
  40. 48

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