Electronics Worksheet: Final Test

Electronics lesson 30: Final electronics test · Set 530 · 40 questions

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.

1. 1.🔘 Which kind of switch stays where you flip it? (a) a push button (b) a tilt switch (c) a toggle switch (d) a reed switch
2. 2.🤖 if (temperature > 36) { show “Hot” } else if (temperature > 20) { show “Warm” } else { show “Cool” }
   The temperature is 20 °C. What is shown? (a) Warm (b) Hot (c) Cool
3. 3.🔍 Which is the odd one out? (a) a keypad (b) a small display (c) a push button (d) a turning knob
4. 4.True or false: if a wire has come loose, the circuit is open and no current flows. (a) False (b) True
5. 5.🧮 Two resistors in parallel give a total that is … (a) less than either one (b) more than either one (c) their sum (d) always zero
6. 6.✏️ In a circuit diagram, which part is drawn as a dot where wires meet? (a) bulb (b) cell (c) LED (d) junction
7. 7.💡 2 identical bulbs are joined in series with a 2 V battery (ideal wires). How many volts does each bulb get? =
8. 8.🔌 Is a sound sensor an input or an output for a microcontroller? (a) input (b) output
9. 9.True or false: a transistor turns a fan or wheels. (a) True (b) False
10. 10.Which of these is an input? (a) a buzzer (b) a motor (c) an LED (d) a turning knob
11. 11.🔘 A cell and a bulb are joined to two side-by-side paths: path 1 has switches A and B one after another, path 2 has switch C. A is ON, B is ON and C is ON. Does the bulb glow? (a) Yes (b) No
12. 12.Which of these mainly makes sound? (a) a loudspeaker (b) a tube light (c) a street light (d) a traffic signal
13. 13.🔌 Which metal is used for most electric wires at home? (a) plastic (b) glass (c) copper (d) rubber
14. 14.🤖 How does a new program get onto a microcontroller board? (a) uploaded over USB (b) drawn with a pen (c) typed on the chip (d) sent by sound
15. 15.🤖 if (light < 400 OR motion) { porch lamp ON } else { porch lamp OFF }
    The light reading is 110 and motion is detected (true). What happens? (a) porch lamp OFF (b) porch lamp ON
16. 16.🔁 count = 1
    while (count < 13) { count = count + 4 }
    How many times does the loop run?
17. 17.⚙️ Which actuator would you use to beep an alarm? (a) an LED (b) a display (c) a buzzer (d) a servo motor
18. 18.🔍 Which is the odd one out? (a) a Wi-Fi weather station (b) an app-controlled bulb (c) a Wi-Fi doorbell camera (d) a plain table fan
19. 19.🔌 Is a steel coin a conductor or an insulator? (a) a conductor (b) an insulator
20. 20.🔋 8 identical 2 V cells are joined in series (+ of one cell to − of the next). What is the total voltage (in volts)? =
21. 21.🗺️ In an input → process → output plan, is “a soil moisture reading” the input, the process or the output? (a) input (b) output (c) process
22. 22.True or false: a room heater mainly gives out light. (a) False (b) True
23. 23.Which of these wastes electricity? (a) set the AC to 24 °C (b) use daylight to read (c) close the fridge quickly (d) leave the TV on standby
24. 24.Which of these mainly makes sound? (a) an electric drill (b) a siren (c) an electric iron (d) a rice cooker
25. 25.🔘 Which kind of switch works only while pressed? (a) a toggle switch (b) a reed switch (c) a push button (d) a tilt switch
26. 26.True or false: “count button presses” is the process. (a) True (b) False
27. 27.🔺 A current of 0.2 A flows through an 8 Ω resistor. What is the voltage across it (in volts)? =
28. 28.🔺 A current of 20 mA flows through a 120 Ω resistor. What is the voltage across it (in volts)? =
29. 29.True or false: a toggle switch springs back when let go. (a) True (b) False
30. 30.🤖 if (light < 300 OR motion) { porch lamp ON } else { porch lamp OFF }
    The light reading is 110 and motion is not detected (false). What happens? (a) porch lamp OFF (b) porch lamp ON
31. 31.⚠️ Is it safe to dry your hands first? (a) not safe (b) safe
32. 32.🧮 Adding another resistor in series makes the total resistance … (a) stay the same (b) zero (c) smaller (d) bigger
33. 33.🌈 Which colour bands (1st digit, 2nd digit, multiplier) mark a 40 Ω resistor? (a) yellow-black-brown (b) green-black-black (c) green-yellow-black (d) yellow-black-black
34. 34.🔋 Does a wind turbine give electricity or use electricity? (a) uses electricity (b) gives electricity
35. 35.🔁 count = 1
    repeat 5 times { count = count + 8 }
    What is count at the end?
36. 36.True or false: triangle, bar and arrows is the symbol for an LED. (a) True (b) False
37. 37.⏱️ What does “wait 500 ms” do? (a) blinks 500 times (b) pauses for half a second (c) turns the LED off (d) waits 500 seconds
38. 38.True or false: to install software updates is a risky habit. (a) True (b) False
39. 39.🔌 Is a plastic straw a conductor or an insulator? (a) a conductor (b) an insulator
40. 40.💡 5 identical bulbs are joined in parallel (each on its own side-by-side path) with a battery and a closed switch on the main wire. Bulb 2 is taken out of its holder. Does bulb 1 glow? (a) No (b) Yes

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