Electronics Worksheet: Final Test

Electronics lesson 30: Final electronics test · Set 563 · 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.True or false: power is measured in ohms (Ω). (a) False (b) True
2. 2.🔌 Why are electric wires covered in plastic? (a) plastic is an insulator (b) plastic makes current (c) to make them heavy (d) plastic is a conductor
3. 3.True or false: “one out, the rest glow” is true of a series circuit. (a) True (b) False
4. 4.⏱️ loop forever { LED ON; wait 950 ms; LED OFF; wait 350 ms }
   How many milliseconds does one blink (ON + OFF) take?
5. 5.🌈 Which band is read first on a resistor? (a) the one nearest an end (b) any band (c) the gold band (d) the widest gap
6. 6.💡 2 identical bulbs are joined in parallel across a 1.5 V battery (ideal wires). How many volts does each bulb get? =
7. 7.🔺 A current of 25 mA flows when 5 V is joined across a resistor. What is its resistance (in ohms)?
8. 8.⚡ A 0.6 W device works on 6 V. What current does it take (in amperes)? =
9. 9.📏 Which unit measures how much a part resists? (a) ampere (A) (b) volt (V) (c) watt (W) (d) ohm (Ω)
10. 10.True or false: the voltmeter measures voltage. (a) True (b) False
11. 11.🌈 In the resistor colour code, which number does blue stand for?
12. 12.🔺 A 2.5 V supply is joined across a 100 Ω resistor. What current flows (in milliamperes, mA)?
13. 13.True or false: to throw cells in a fire is safe. (a) True (b) False
14. 14.🔁 What does “count = count + 1” do? (a) prints 1 (b) takes 1 away (c) sets count to 1 (d) adds 1 to count
15. 15.⚡ A 6 W device works on 3 V. What current does it take (in amperes)? =
16. 16.💡 A battery lights 2 identical bulbs joined in series. One more identical bulb is added in series. How do the bulbs glow now? (a) the same (b) brighter (c) dimmer
17. 17.💡 2 identical bulbs are joined in parallel across a 6 V battery (ideal wires). How many volts does each bulb get? =
18. 18.⏱️ How many milliseconds are in 1 second? (a) 100 (b) 10 (c) 1000 (d) 60
19. 19.⏱️ repeat 3 times { buzzer ON; wait 300 ms; buzzer OFF; wait 1000 ms }
    How many milliseconds does this take in all?
20. 20.🔋 Does an air conditioner give electricity or use electricity? (a) uses electricity (b) gives electricity
21. 21.⏱️ loop forever { LED ON; wait 100 ms; LED OFF; wait 150 ms }
    How many times does the LED blink in 6 seconds?
22. 22.🌐 Is a Wi-Fi smart plug an IoT device? (a) not an IoT device (b) an IoT device
23. 23.✏️ Why do engineers draw circuits with symbols? (a) symbols are heavier (b) to hide the circuit (c) quick and clear for all (d) to make it colourful
24. 24.🧩 Which component blows if current is high? (a) LED (b) fuse (c) thermistor (d) buzzer
25. 25.💡 Old festival light strings went fully dark when one bulb failed. How were they joined? (a) not joined (b) in series (c) by Wi-Fi (d) in parallel
26. 26.🔍 Which is the odd one out? (a) a doorbell (b) a buzzer (c) a street light (d) a loudspeaker
27. 27.🔁 count = 4
    repeat 5 times { count = count + 7 }
    What is count at the end?
28. 28.🔌 Is a paper strip a conductor or an insulator? (a) an insulator (b) a conductor
29. 29.True or false: “bulbs share the voltage” is true of a series circuit. (a) False (b) True
30. 30.🧮 Two equal 220 Ω resistors are joined in parallel. What is the total resistance (in ohms)?
31. 31.🔺 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
32. 32.💡 A battery lights 4 identical bulbs joined in parallel. One more identical bulb is added in parallel. How do the bulbs glow now? (a) dimmer (b) the same (c) brighter
33. 33.📶 Digital or analog: a door: open or shut? (a) analog (b) digital
34. 34.🤖 if (light < 200) { lamp ON } else { lamp OFF }
    The light sensor reads 299. What happens? (a) lamp OFF (b) lamp ON
35. 35.💡 An LED (with its resistor) is on pin 7. All pins start LOW. The program runs once:
    set pin 8 LOW
    set pin 7 LOW
    set pin 7 LOW
    set pin 8 HIGH
    Is the LED ON or OFF at the end? (a) OFF (b) ON
36. 36.🔍 Which is the odd one out? (a) a graphite rod (b) a paper strip (c) a glass marble (d) a rubber eraser
37. 37.🔺 A current of 20 mA flows when 3 V is joined across a resistor. What is its resistance (in ohms)?
38. 38.🔺 The voltage stays the same and the resistance gets bigger. The current … (a) gets smaller (b) becomes zero (c) gets bigger (d) stays the same
39. 39.🔋 How many volts does one ordinary torch cell give? (a) 1.5 V (b) 0.5 V (c) 230 V (d) 15 V
40. 40.🔗 Series or parallel circuit: “a single current path”? (a) parallel (b) series

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