Electronics Worksheet: Final Test

Electronics lesson 30: Final electronics test · Set 762 · 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.🧮 Adding another resistor in series makes the total resistance … (a) smaller (b) zero (c) stay the same (d) bigger
2. 2.Which of these usually has a microcontroller inside? (a) a microwave oven (b) a spinning top (c) a candle (d) a hand pump
3. 3.Which of these is the output? (a) decide if soil is dry (b) a light level reading (c) a buzzer beeps (d) a button press
4. 4.🔌 Why are electric wires covered in plastic? (a) to make them heavy (b) plastic makes current (c) plastic is a conductor (d) plastic is an insulator
5. 5.🔁 count = 6
   repeat 9 times { count = count + 9 }
   What is count at the end?
6. 6.🔦 A circuit has a new cell, a good bulb and a switch that is OFF. All the wires are firmly joined. A gap in one wire is bridged by a plastic straw. Does the bulb glow? (a) Yes (b) No
7. 7.What does a thermistor do? (a) senses how hot it is (b) glows using little power (c) blows if current is high (d) smooths a wobbly supply
8. 8.🔺 A current of 1 A flows when 15 V is joined across a resistor. What is its resistance (in ohms)?
9. 9.True or false: to throw cells in a fire is not safe. (a) True (b) False
10. 10.🔍 Which is the odd one out? (a) accept every permission (b) keep factory passwords (c) set up with a parent (d) reuse one password
11. 11.Which of these is a good habit? (a) ignore update messages (b) change default passwords (c) tap unknown app links (d) post your live location
12. 12.✏️ In a circuit diagram, which part is drawn as two or more cell symbols? (a) motor (b) resistor (c) switch (d) battery
13. 13.⚡ A bicycle dynamo changes which kind of energy into electricity? (a) sound energy (b) chemical energy (c) light energy (d) movement energy
14. 14.🔘 Two switches are in parallel (side by side). When does the bulb glow? (a) when either is ON (b) never (c) only when both are OFF (d) only when both are ON
15. 15.🤖 Microcontroller or laptop: which one runs one small program? (a) laptop (b) microcontroller
16. 16.💡 Old festival light strings went fully dark when one bulb failed. How were they joined? (a) in parallel (b) not joined (c) in series (d) by Wi-Fi
17. 17.Which of these is true of a parallel circuit? (a) a break stops every bulb (b) bulbs share the voltage (c) used in house wiring (d) one bulb out, all go out
18. 18.True or false: a spinning top usually has a microcontroller inside. (a) False (b) True
19. 19.🔍 Which is the odd one out? (a) a woollen thread (b) a steel spoon (c) a rubber eraser (d) a glass marble
20. 20.🤖 if (distance < 20) { buzzer beeps } else { buzzer is silent }
    The distance sensor reads 25 cm. What happens? (a) buzzer is silent (b) buzzer beeps
21. 21.⚡ A cell changes stored chemical energy into which kind of energy? (a) wind energy (b) nuclear energy (c) sound energy (d) electrical energy
22. 22.🔺 In the V-I-R triangle, how do we find V? (a) V = I ÷ R (b) V = I + R (c) V = I × R (d) V = R ÷ I
23. 23.📏 How many kilowatts (kW) is 3950 W? =
24. 24.⏱️ How many milliseconds is a wait of 3.9 seconds?
25. 25.Which of these is a conductor? (a) a glass marble (b) a steel coin (c) a wooden stick (d) a paper strip
26. 26.🔁 x = 3
    repeat 2 times { x = x × 2 }
    What is x at the end?
27. 27.🔋 3 identical 1.5 V cells are joined in series (+ of one cell to − of the next). What is the total voltage (in volts)? =
28. 28.Which of these mainly makes movement? (a) an electric kettle (b) a table fan (c) an electric iron (d) an LED lamp
29. 29.🧩 A capacitor in a circuit can … (a) store charge briefly (b) make light (c) measure heat (d) spin a wheel
30. 30.What does a push button do? (a) works only while pressed (b) flips up or down (c) stays where you flip it (d) closes near a magnet
31. 31.🔁 total = 0
    for i = 1 to 9 { total = total + i }
    What is total at the end?
32. 32.🔁 What does “count = count + 1” do? (a) takes 1 away (b) prints 1 (c) adds 1 to count (d) sets count to 1
33. 33.True or false: “used in house wiring” is true of a parallel circuit. (a) True (b) False
34. 34.🤖 if (temperature > 32) { fan ON } else { fan OFF }
    The temperature sensor reads 28 °C. What happens? (a) fan ON (b) fan OFF
35. 35.🌐 How does a home IoT device usually send its data to the app? (a) by post (b) over Wi-Fi (c) through a candle (d) by shouting
36. 36.Which of these is true of a series circuit? (a) each gets the full volts (b) one bulb out, all go out (c) own switch for each bulb (d) one out, the rest glow
37. 37.🔁 count = 1
    while (count < 7) { count = count + 3 }
    How many times does the loop run?
38. 38.True or false: on an LED, the leg by the flat edge is the anode (+). (a) False (b) True
39. 39.🔺 In the V-I-R triangle, how do we find I? (a) I = V ÷ R (b) I = V × R (c) I = R ÷ V (d) I = V + R
40. 40.🤖 “if (A AND B)” is true when … (a) both A and B are true (b) only B is true (c) both are false (d) only A is true

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