← Final electronics test lesson New set →

Electronics Worksheet: Final Test

Electronics lesson 30: Final electronics test · Set 86 · 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 program says “wait 7000 ms”. How many seconds is that? =
  2. 2.🔢 To plan an electronics project, which comes first: “list inputs and outputs” or “draw the circuit diagram”? (a) draw the circuit diagram (b) list inputs and outputs
  3. 3.🔺 A current of 40 mA flows when 16 V is joined across a resistor. What is its resistance (in ohms)?
  4. 4.🔘 Which kind of switch works only while pressed? (a) a tilt switch (b) a slide switch (c) a toggle switch (d) a push button
  5. 5.🔁 count = 2
    while (count < 10) { count = count + 2 }
    How many times does the loop run?
  6. 6.🔁 x = 4
    repeat 5 times { x = x × 2 }
    What is x at the end?
  7. 7.🤖 if (temperature > 32) { show “Hot” } else if (temperature > 25) { show “Warm” } else { show “Cool” }
    The temperature is 13 °C. What is shown?     (a) Hot (b) Warm (c) Cool
  8. 8.🌐 Is a battery torch an IoT device? (a) not an IoT device (b) an IoT device
  9. 9.📏 How many kilo-ohms (kΩ) is 9300 Ω? =
  10. 10.🌈 Which colour bands (1st digit, 2nd digit, multiplier) mark a 98 Ω resistor? (a) brown-grey-black (b) white-grey-black (c) white-grey-brown (d) grey-white-black
  11. 11.🔦 A tester circuit has a new cell, a good bulb and wires with a gap between two clips. We put a glass marble across the gap. Does the bulb glow? (a) No (b) Yes
  12. 12.🔋 Cells joined + to − in a row (series) give … (a) no voltage (b) a smaller voltage (c) the same voltage (d) a bigger voltage
  13. 13.🤖 Which is a safe power source for a beginner microcontroller board? (a) a wall socket directly (b) a 230 V cable (c) bare mains wires (d) USB or a 9 V battery
  14. 14.🧩 Which component turns a fan or wheels? (a) potentiometer (b) motor (c) transistor (d) resistor
  15. 15.🔋 Does a battery give electricity or use electricity? (a) gives electricity (b) uses electricity
  16. 16.True or false: to keep drinks far away is safe. (a) True (b) False
  17. 17.True or false: a circle with an X in it is the symbol for an LED. (a) False (b) True
  18. 18.🔦 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) No (b) Yes
  19. 19.🔺 A current of 1 A flows through a 4 Ω resistor. What is the voltage across it (in volts)? =
  20. 20.🔁 Is the circuit closed or open if a wire has come loose? (a) open (b) closed
  21. 21.🌈 A gold fourth band on a resistor means the value may be off by … (a) 0 % (b) 25 % (c) 50 % (d) 5 %
  22. 22.🔋 Does a water pump give electricity or use electricity? (a) gives electricity (b) uses electricity
  23. 23.True or false: on a cell, “the end with a bump” means the + (positive) end. (a) True (b) False
  24. 24.🧮 A 3 V battery is joined to 2 Ω and 10 Ω resistors in series. What current flows (in amperes)? =
  25. 25.🧩 Which component is a resistance knob? (a) potentiometer (b) fuse (c) diode (d) motor
  26. 26.⏱️ loop forever { LED ON; wait 550 ms; LED OFF; wait 800 ms }
    How many milliseconds does one blink (ON + OFF) take?
  27. 27.Which of these mainly gives out heat? (a) a buzzer (b) an LED lamp (c) a tube light (d) a rice cooker
  28. 28.💡 Old festival light strings went fully dark when one bulb failed. How were they joined? (a) by Wi-Fi (b) not joined (c) in series (d) in parallel
  29. 29.🧾 A family uses 150 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
  30. 30.Which of these is an input? (a) a water pump (b) a small display (c) a servo motor (d) a motion sensor
  31. 31.Which of these means the circuit is closed? (a) all wires are joined (b) the switch is OFF (c) a wire is cut (d) a wire has come loose
  32. 32.🧩 Which component boosts a small signal? (a) LDR (b) motor (c) transistor (d) capacitor
  33. 33.🔋 On a cell, does “the end with a bump” mean the + end or the − end? (a) + (positive) (b) − (negative)
  34. 34.True or false: “a temperature reading” is the input. (a) False (b) True
  35. 35.⚠️ Is it safe to keep drinks far away? (a) safe (b) not safe
  36. 36.Which of these is an input? (a) a motor (b) a small display (c) a temperature sensor (d) a servo motor
  37. 37.💡 An LED (with its resistor) is on pin 8. All pins start LOW. The program runs once:
    set pin 7 HIGH
    set pin 8 HIGH
    set pin 7 LOW
    set pin 7 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  38. 38.True or false: on a cell, “usually the black wire” means the − (negative) end. (a) False (b) True
  39. 39.🔺 In the V-I-R triangle, how do we find V? (a) V = I × R (b) V = I ÷ R (c) V = R ÷ I (d) V = I + R
  40. 40.⏱️ A program says “wait 3250 ms”. How many seconds is that? =

Answer key

  1. 7
  2. list inputs and outputs
  3. 400
  4. a push button
  5. 4
  6. 128
  7. Cool
  8. not an IoT device
  9. 9.3
  10. white-grey-black
  11. No
  12. a bigger voltage
  13. USB or a 9 V battery
  14. motor
  15. gives electricity
  16. True
  17. False
  18. No
  19. 4
  20. open
  21. 5 %
  22. uses electricity
  23. True
  24. 0.25
  25. potentiometer
  26. 1350
  27. a rice cooker
  28. in series
  29. 900
  30. a motion sensor
  31. all wires are joined
  32. transistor
  33. + (positive)
  34. True
  35. safe
  36. a temperature sensor
  37. ON
  38. True
  39. V = I × R
  40. 3.25

Free electronics lessons, practice and worksheets at talentjr.in/electronics-for-kids