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Electronics Worksheet: Final Test

Electronics lesson 30: Final electronics test · Set 205 · 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 component has coloured bands? (a) transistor (b) diode (c) resistor (d) potentiometer
  2. 2.🔺 A current of 40 mA flows through a 200 Ω resistor. What is the voltage across it (in volts)? =
  3. 3.📏 In the water-pipe picture of a circuit, current is like … (a) a narrow pipe (b) the pipe colour (c) the flow of water (d) the water pressure
  4. 4.🔁 count = 10
    repeat 5 times { count = count + 2 }
    What is count at the end?
  5. 5.🔋 6 identical 1.2 V cells are joined side by side in parallel (all + ends together, all − ends together). What is the voltage across them (in volts)? =
  6. 6.🔦 A tester circuit has a new cell, a good bulb and wires with a gap between two clips. We put a wooden stick across the gap. Does the bulb glow? (a) Yes (b) No
  7. 7.🔘 A bulb and a cell are joined through 4 switches on 4 side-by-side paths, one switch on each path (parallel). What is the smallest number of switches that must be ON to light the bulb?
  8. 8.🔋 On a cell, does “the shorter symbol line” mean the + end or the − end? (a) + (positive) (b) − (negative)
  9. 9.🌐 A weather station sends one reading every 20 seconds. How many readings does it send in 7 minutes?
  10. 10.Which of these is an insulator? (a) a brass key (b) a plastic straw (c) a steel spoon (d) a metal paper clip
  11. 11.True or false: the push of a cell is measured in amperes (A). (a) False (b) True
  12. 12.True or false: to poke things in a socket is not safe. (a) True (b) False
  13. 13.Which of these is safe? (a) dry your hands first (b) throw cells in a fire (c) open a phone charger (d) poke things in a socket
  14. 14.🌐 Is a paper calendar an IoT device? (a) not an IoT device (b) an IoT device
  15. 15.💡 What does LED stand for? (a) low energy device (b) large electric dial (c) light energy dial (d) light-emitting diode
  16. 16.🔍 Which is the odd one out? (a) switch off empty rooms (b) leave the TV on standby (c) iron one shirt at a time (d) run fans in empty rooms
  17. 17.🤖 if (light < 300) { lamp ON } else { lamp OFF }
    The light sensor reads 281. What happens?     (a) lamp ON (b) lamp OFF
  18. 18.True or false: a line lifted at a gap is the symbol for a switch. (a) True (b) False
  19. 19.True or false: on a cell, “usually the red wire” means the − (negative) end. (a) False (b) True
  20. 20.Which of these is a conductor? (a) a dry cork (b) a cotton thread (c) a plastic straw (d) a steel spoon
  21. 21.True or false: a smart watch usually has a microcontroller inside. (a) True (b) False
  22. 22.True or false: a straight line is the symbol for a wire. (a) True (b) False
  23. 23.🌐 In an IoT system, which part reads values, decides? (a) sensor (b) microcontroller (c) actuator (d) cloud server
  24. 24.🧮 A 1.2 V battery is joined to 10 Ω and 2 Ω resistors in series. What current flows (in amperes)? =
  25. 25.True or false: to install software updates is a good habit. (a) True (b) False
  26. 26.⚙️ Which actuator would you use to move water to plants? (a) a display (b) an LED (c) a pump (d) a buzzer
  27. 27.⏱️ loop forever { LED ON; wait 200 ms; LED OFF; wait 50 ms }
    How many times does the LED blink in 8 seconds?
  28. 28.🔌 Is a motion sensor an input or an output for a microcontroller? (a) input (b) output
  29. 29.What does a fuse do? (a) senses how hot it is (b) blows if current is high (c) smooths a wobbly supply (d) beeps for an alarm
  30. 30.💡 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 8 LOW
    set pin 8 LOW
    Is the LED ON or OFF at the end?     (a) OFF (b) ON
  31. 31.🔗 Series or parallel circuit: “bulbs share the voltage”? (a) parallel (b) series
  32. 32.Which of these is a conductor? (a) a ceramic cup (b) a plastic straw (c) aluminium foil (d) a wooden stick
  33. 33.True or false: a buzzer makes a beeping sound. (a) True (b) False
  34. 34.⏱️ loop forever { LED ON; wait 300 ms; LED OFF; wait 700 ms }
    How many times does the LED blink in 6 seconds?
  35. 35.What does a push button do? (a) flips up or down (b) closes near a magnet (c) stays where you flip it (d) springs back when let go
  36. 36.🤖 if (light < 200 OR motion) { porch lamp ON } else { porch lamp OFF }
    The light reading is 50 and motion is not detected (false). What happens?     (a) porch lamp OFF (b) porch lamp ON
  37. 37.📏 How many kilo-ohms (kΩ) is 8800 Ω? =
  38. 38.💡 2 identical bulbs are joined in series with a battery and a closed switch on the main wire. All the bulbs are in place. Does bulb 1 glow? (a) Yes (b) No
  39. 39.🔦 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 graphite rod. Does the bulb glow? (a) No (b) Yes
  40. 40.True or false: on a cell, “the flat end” means the + (positive) end. (a) True (b) False

Answer key

  1. resistor
  2. 8
  3. the flow of water
  4. 20
  5. 1.2
  6. No
  7. 1
  8. − (negative)
  9. 21
  10. a plastic straw
  11. False
  12. True
  13. dry your hands first
  14. not an IoT device
  15. light-emitting diode
  16. switch off empty rooms
  17. lamp ON
  18. True
  19. False
  20. a steel spoon
  21. True
  22. True
  23. microcontroller
  24. 0.1
  25. True
  26. a pump
  27. 32
  28. input
  29. blows if current is high
  30. OFF
  31. series
  32. aluminium foil
  33. True
  34. 6
  35. springs back when let go
  36. porch lamp ON
  37. 8.8
  38. Yes
  39. Yes
  40. False

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