Electronics Worksheet: Final Test

Electronics lesson 30: Final electronics test · Set 577 · 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 of these is measured in amperes (A)? (a) the flow of charge (b) power (c) resistance (d) how much a part resists
2. 2.💡 What happens if an LED is put in backwards? (a) it does not light (b) it changes colour (c) it makes a sound (d) it lights brighter
3. 3.🔘 What does a switch do in a circuit? (a) stores current (b) opens or closes the loop (c) changes the voltage (d) makes electricity
4. 4.⚡ A device works on 24 V and takes 1.5 A. What is its power (in watts)? =
5. 5.🔋 A 6 V battery and four 1.5 V cells are joined in series, all facing the same way. What is the total voltage (in volts)? =
6. 6.True or false: a motor is a resistance knob. (a) False (b) True
7. 7.⚡ What does a room heater mainly change electricity into? (a) movement (b) heat (c) light (d) sound
8. 8.🔌 Is a rubber band a conductor or an insulator? (a) an insulator (b) a conductor
9. 9.Which of these is safe? (a) dry your hands first (b) touch a switch when wet (c) use mains for a project (d) poke things in a socket
10. 10.🔦 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 cotton thread. Does the bulb glow? (a) Yes (b) No
11. 11.⚡ Which tiny particles drift along a metal wire to carry the current? (a) photons (b) dust particles (c) electrons (d) water drops
12. 12.📏 Voltmeter or ammeter: which one is joined across a part? (a) ammeter (b) voltmeter
13. 13.⏱️ repeat 3 times { buzzer ON; wait 900 ms; buzzer OFF; wait 600 ms }
    How many milliseconds does this take in all?
14. 14.🧩 A capacitor in a circuit can … (a) store charge briefly (b) make light (c) measure heat (d) spin a wheel
15. 15.🌈 A resistor has the colour bands grey, green, orange. What is its value (in ohms)?
16. 16.🔌 Is a push button an input or an output for a microcontroller? (a) output (b) input
17. 17.🔺 A 23.5 V supply is joined across a 470 Ω resistor. What current flows (in milliamperes, mA)?
18. 18.🔁 count = 9
    repeat 3 times { count = count + 7 }
    What is count at the end?
19. 19.True or false: to share the Wi-Fi key is a good habit. (a) False (b) True
20. 20.🔗 Series or parallel circuit: “bulbs share the voltage”? (a) series (b) parallel
21. 21.💡 2 identical bulbs are joined in series with a battery and a closed switch on the main wire. Bulb 1 is taken out of its holder. How many bulbs glow?
22. 22.🔋 How many 1.2 V cells must be joined in series to give 7.2 V?
23. 23.Which of these usually has a microcontroller inside? (a) a microwave oven (b) a wind-up toy (c) a spinning top (d) a plain wall switch
24. 24.True or false: a tilt switch closes when tipped over. (a) True (b) False
25. 25.🔍 For a microcontroller, is a sensor an input or an output? (a) a fuse (b) an output (c) a power source (d) an input
26. 26.🔗 Series or parallel circuit: “one bulb out, all go out”? (a) parallel (b) series
27. 27.🧮 Resistors of 150 Ω, 100 Ω, 10 Ω and 47 Ω are joined in series. What is the total resistance (in ohms)?
28. 28.💡 Why does an LED need a resistor in series? (a) to make it brighter (b) to change its colour (c) to store charge (d) to limit the current
29. 29.🔺 A current of 25 mA flows when 7.5 V is joined across a resistor. What is its resistance (in ohms)?
30. 30.🔁 repeat 5 times { repeat 4 times { beep } }
    How many beeps are there?
31. 31.📏 Which unit measures energy used each second? (a) ohm (Ω) (b) watt (W) (c) volt (V) (d) ampere (A)
32. 32.🧾 Which lamp gives the same light for the least power? (a) an oil lamp (b) a filament bulb (c) a candle (d) an LED lamp
33. 33.⚡ What does a doorbell mainly change electricity into? (a) heat (b) light (c) movement (d) sound
34. 34.📶 A pin that reads a push button is set as … (a) a resistor (b) an input (c) an output (d) a battery
35. 35.⚠️ Why must we never touch switches with wet hands? (a) it is just untidy (b) water makes it cold (c) it spoils the paint (d) water carries current
36. 36.💡 On an LED, is the shorter leg the anode (+) or the cathode (−)? (a) anode (+) (b) cathode (−)
37. 37.🔘 Which kind of switch springs back when let go? (a) a reed switch (b) a tilt switch (c) a push button (d) a slide switch
38. 38.🧭 Which part of a microcontroller board runs the program? (a) the USB port (b) the voltage regulator (c) the main chip (d) the reset button
39. 39.Which of these is an output? (a) a temperature sensor (b) a buzzer (c) a sound sensor (d) a motion sensor
40. 40.✏️ In a circuit diagram, which part is drawn as two or more cell symbols? (a) ammeter (b) battery (c) motor (d) voltmeter

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