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Electronics Worksheet: Final Test

Electronics lesson 30: Final electronics test · Set 628 · 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.🌈 A resistor has the colour bands green, yellow, red. What is its value (in ohms)?
  2. 2.🔍 Which is the odd one out? (a) a motion sensor signal (b) count button presses (c) a temperature reading (d) a soil moisture reading
  3. 3.Which of these mainly makes movement? (a) a ceiling fan (b) a torch (c) a buzzer (d) a siren
  4. 4.True or false: a circle with an X in it is the symbol for a bulb. (a) False (b) True
  5. 5.✏️ In a circuit diagram, which part is drawn as a dot where wires meet? (a) junction (b) cell (c) voltmeter (d) wire
  6. 6.🌐 Each reading a sensor sends is 20 bytes. How many bytes do 140 readings take?
  7. 7.🗺️ In “input → process → output”, which part is the decision the program makes? (a) the output (b) the process (c) the input (d) the battery
  8. 8.🔁 What must there be for a current to flow? (a) one loose end (b) a broken path (c) a complete loop (d) a plastic gap
  9. 9.🔋 On a cell, does “the flat end” mean the + end or the − end? (a) − (negative) (b) + (positive)
  10. 10.🌐 Each reading a sensor sends is 25 bytes. How many bytes do 140 readings take?
  11. 11.🔺 A current of 1 A flows through a 2 Ω resistor. What is the voltage across it (in volts)? =
  12. 12.🔐 Is it a good or a risky habit to accept every permission? (a) risky habit (b) good habit
  13. 13.🔺 A current of 2.5 A flows through an 8 Ω resistor. What is the voltage across it (in volts)? =
  14. 14.Which drawing is the symbol for a battery? (a) a dot where wires meet (b) a circle with a cross (c) a line lifted at a gap (d) two or more cell symbols
  15. 15.🔢 To get a sensor reading onto a phone, what comes right after “the sensor measures”? (a) the app shows it (b) the cloud stores it (c) it is sent by Wi-Fi (d) the board reads it
  16. 16.Which of these is true of a parallel circuit? (a) a single current path (b) one out, the rest glow (c) one bulb out, all go out (d) bulbs share the voltage
  17. 17.⏱️ loop forever { LED ON; wait 250 ms; LED OFF; wait 750 ms }
    How many times does the LED blink in 2 seconds?
  18. 18.⏱️ loop forever { LED ON; wait 200 ms; LED OFF; wait 50 ms }
    How many times does the LED blink in 2 seconds?
  19. 19.🧩 Which part changes electrical energy into sound? (a) a resistor (b) a buzzer (c) a capacitor (d) a diode
  20. 20.True or false: a candle usually has a microcontroller inside. (a) True (b) False
  21. 21.🧩 A capacitor in a circuit can … (a) spin a wheel (b) make light (c) measure heat (d) store charge briefly
  22. 22.⏱️ loop forever { LED ON; wait 150 ms; LED OFF; wait 100 ms }
    How many times does the LED blink in 3 seconds?
  23. 23.Which job needs a distance sensor? (a) switch on with a clap (b) make a parking alarm (c) measure classroom noise (d) spot someone walking in
  24. 24.Which job is done by the power LED? (a) runs the program (b) connect sensors and LEDs (c) restarts the program (d) shows the board is on
  25. 25.True or false: “the fan starts” is the process. (a) True (b) False
  26. 26.🧾 A family uses 90 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
  27. 27.True or false: “the pump turns on” is the process. (a) True (b) False
  28. 28.True or false: “a knob turned part way” is an analog signal. (a) False (b) True
  29. 29.🔘 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 ON. Does the bulb glow? (a) No (b) Yes
  30. 30.🤖 if (light < 400 OR motion) { porch lamp ON } else { porch lamp OFF }
    The light reading is 180 and motion is detected (true). What happens?     (a) porch lamp ON (b) porch lamp OFF
  31. 31.⚡ Which formula gives electric power? (a) P = V × I (b) P = V ÷ I (c) P = I ÷ V (d) P = V + I
  32. 32.True or false: a smart watch has no microcontroller inside. (a) False (b) True
  33. 33.🔐 Is it a good or a risky habit to change default passwords? (a) risky habit (b) good habit
  34. 34.🔋 How many 1.2 V cells must be joined in series to give 3.6 V?
  35. 35.✏️ In a circuit diagram, wires are usually drawn as … (a) dotted circles (b) little stars (c) straight lines (d) wavy lines
  36. 36.🔺 A current of 1.5 A flows through an 8 Ω resistor. What is the voltage across it (in volts)? =
  37. 37.⚡ A home appliance on the 230 V mains takes 4 A. What is its power (in watts)?
  38. 38.🔺 A current of 1.5 A flows through a 4 Ω resistor. What is the voltage across it (in volts)? =
  39. 39.🌐 A weather station sends one reading every 15 seconds. How many readings does it send in 4 minutes?
  40. 40.What does a buzzer do? (a) blows if current is high (b) lets current go one way (c) beeps for an alarm (d) boosts a small signal

Answer key

  1. 5400
  2. count button presses
  3. a ceiling fan
  4. True
  5. junction
  6. 2800
  7. the process
  8. a complete loop
  9. − (negative)
  10. 3500
  11. 2
  12. risky habit
  13. 20
  14. two or more cell symbols
  15. the board reads it
  16. one out, the rest glow
  17. 2
  18. 8
  19. a buzzer
  20. False
  21. store charge briefly
  22. 12
  23. make a parking alarm
  24. shows the board is on
  25. False
  26. 360
  27. False
  28. True
  29. Yes
  30. porch lamp ON
  31. P = V × I
  32. False
  33. good habit
  34. 3
  35. straight lines
  36. 12
  37. 920
  38. 6
  39. 16
  40. beeps for an alarm

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