Electronics Worksheet: Final Test

Electronics lesson 30: Final electronics test · Set 605 · 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 job is done by the power LED? (a) connect sensors and LEDs (b) restarts the program (c) shows the board is on (d) keeps the voltage steady
2. 2.🧮 Two equal 200 Ω resistors are joined in parallel. What is the total resistance (in ohms)?
3. 3.🧮 A 0.9 V battery is joined to 6 Ω and 3 Ω resistors in series. What current flows (in amperes)? =
4. 4.📏 Which unit measures how much a part resists? (a) ohm (Ω) (b) volt (V) (c) watt (W) (d) ampere (A)
5. 5.🔍 Which sensor would you use to close a window in rain? (a) a light sensor (b) a soil moisture sensor (c) a rain sensor (d) a sound sensor
6. 6.⏱️ loop forever { LED ON; wait 900 ms; LED OFF; wait 300 ms }
   How many milliseconds does one blink (ON + OFF) take?
7. 7.🔁 What must there be for a current to flow? (a) one loose end (b) a broken path (c) a plastic gap (d) a complete loop
8. 8.🌈 In the resistor colour code, which number does black stand for?
9. 9.Which of these is an insulator? (a) a steel coin (b) a graphite rod (c) a safety pin (d) a wooden stick
10. 10.⏱️ loop forever { LED ON; wait 400 ms; LED OFF; wait 600 ms }
    How many times does the LED blink in 10 seconds?
11. 11.True or false: a reed switch works only while pressed. (a) False (b) True
12. 12.Which of these is true of a series circuit? (a) many paths for current (b) used in house wiring (c) own switch for each bulb (d) a break stops every bulb
13. 13.🔁 repeat 3 times { repeat 2 times { beep } }
    How many beeps are there?
14. 14.🧩 Which component boosts a small signal? (a) diode (b) motor (c) transistor (d) resistor
15. 15.🔍 Which is the odd one out? (a) an exhaust fan (b) an electric toy car (c) a ceiling fan (d) a traffic signal
16. 16.🔍 Which is the odd one out? (a) set the AC to 24 °C (b) unplug idle chargers (c) use LED lamps (d) leave the TV on standby
17. 17.🏠 Which is a smart-home example? (a) a candle in a jar (b) a printed map (c) lights on from an app (d) a hand fan
18. 18.True or false: “each gets the full volts” is true of a parallel circuit. (a) False (b) True
19. 19.🤖 In “if (temp > 30)”, what runs when temp is exactly 30? (a) the if part (b) the else part (c) neither part (d) both parts
20. 20.Which of these is the output? (a) a temperature reading (b) a soil moisture reading (c) compare with a limit (d) a buzzer beeps
21. 21.✏️ In a circuit diagram, wires are usually drawn as … (a) wavy lines (b) dotted circles (c) little stars (d) straight lines
22. 22.True or false: a plastic ruler is a conductor. (a) True (b) False
23. 23.True or false: to share only needed data is a good habit. (a) True (b) False
24. 24.🔘 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 OFF and C is ON. Does the bulb glow? (a) No (b) Yes
25. 25.🤖 if (temperature > 32) { show “Hot” } else if (temperature > 20) { show “Warm” } else { show “Cool” }
    The temperature is 29 °C. What is shown? (a) Cool (b) Warm (c) Hot
26. 26.Which of these is a conductor? (a) a plastic ruler (b) a safety pin (c) a rubber band (d) a glass marble
27. 27.🔗 Series or parallel circuit: “each gets the full volts”? (a) series (b) parallel
28. 28.🧮 Two resistors in parallel give a total that is … (a) less than either one (b) always zero (c) their sum (d) more than either one
29. 29.⚠️ Is it safe to dry your hands first? (a) safe (b) not safe
30. 30.✏️ In a circuit diagram, which part is drawn as a circle with an X in it? (a) bulb (b) switch (c) resistor (d) junction
31. 31.🔁 count = 1
    while (count < 25) { count = count + 4 }
    How many times does the loop run?
32. 32.True or false: a brass key is an insulator. (a) True (b) False
33. 33.True or false: a circle with M inside is the symbol for a motor. (a) True (b) False
34. 34.True or false: the voltmeter measures voltage. (a) True (b) False
35. 35.🔁 A bulb has two contacts. How many must be joined into the loop for it to glow? (a) none (b) both of them (c) only one (d) it does not matter
36. 36.⚠️ Someone is getting a shock and is still touching a wire. What should you do? (a) pull them by the hand (b) shout for an adult (c) pour water on them (d) wait and watch
37. 37.💡 Does it save or waste electricity to leave the TV on standby? (a) wastes electricity (b) saves electricity
38. 38.Which of these is the process? (a) the fan starts (b) a button press (c) a temperature reading (d) decide if soil is dry
39. 39.🧮 Resistors of 330 Ω and 10 Ω are joined in series. What is the total resistance (in ohms)?
40. 40.🔁 count = 2
    repeat 6 times { count = count + 2 }
    What is count at the end?

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