Electronics Worksheet: Final Test

Electronics lesson 30: Final electronics test · Set 575 · 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: to switch on with a clap, use a temperature sensor. (a) False (b) True
2. 2.Which of these is a good habit? (a) post your live location (b) accept every permission (c) cover unused cameras (d) tap unknown app links
3. 3.🤖 Does a digital alarm clock usually have a microcontroller inside? (a) Yes (b) No
4. 4.🔐 A smart speaker is always listening for its wake word. What is a sensible habit? (a) mute it when not in use (b) let strangers use it (c) tell it your passwords (d) put it in the bathroom
5. 5.🔘 When a switch is ON, the circuit is … (a) open (b) cut (c) broken (d) closed
6. 6.💡 A blue LED uses 3 V and should get 20 mA. It runs from a 9 V supply. What resistor (in ohms) is needed in series?
7. 7.⏱️ loop forever { LED ON; wait 250 ms; LED OFF; wait 250 ms }
   How many times does the LED blink in 8 seconds?
8. 8.⏱️ How many milliseconds is a wait of 5 seconds?
9. 9.🔺 A 24 V supply is joined across a 12 Ω resistor. What current flows (in amperes)? =
10. 10.💡 Why is house wiring done in parallel? (a) to make bulbs dim (b) each gets full voltage (c) to save copper only (d) so all go off together
11. 11.🔌 Is a graphite rod a conductor or an insulator? (a) an insulator (b) a conductor
12. 12.True or false: to use old filament bulbs saves electricity. (a) False (b) True
13. 13.⏱️ repeat 2 times { buzzer ON; wait 500 ms; buzzer OFF; wait 1000 ms }
    How many milliseconds does this take in all?
14. 14.⚡ What does an exhaust fan mainly change electricity into? (a) light (b) movement (c) sound (d) heat
15. 15.🌐 In an IoT system, which part stores data online? (a) Wi-Fi (b) sensor (c) cloud server (d) microcontroller
16. 16.🔁 total = 0
    for i = 1 to 8 { total = total + i }
    What is total at the end?
17. 17.🔁 total = 0
    for i = 1 to 10 { total = total + i }
    What is total at the end?
18. 18.True or false: to touch a fallen wire is safe. (a) True (b) False
19. 19.True or false: a steel coin is a conductor. (a) True (b) False
20. 20.True or false: to install software updates is a risky habit. (a) True (b) False
21. 21.💡 3 identical bulbs are joined in series with a battery and a closed switch on the main wire. Bulb 3 is taken out of its holder. Does bulb 1 glow? (a) Yes (b) No
22. 22.🧮 Two equal 220 Ω resistors are joined in parallel. What is the total resistance (in ohms)?
23. 23.🔁 repeat 3 times { repeat 6 times { beep } }
    How many beeps are there?
24. 24.✏️ In a circuit diagram, which part is drawn as a circle with an X in it? (a) voltmeter (b) bulb (c) battery (d) wire
25. 25.🔐 Privacy for a smart device means controlling … (a) its colour (b) how loud it beeps (c) its battery size (d) who can see your data
26. 26.Which of these usually has a microcontroller inside? (a) a hand pump (b) a spinning top (c) a smart watch (d) a candle
27. 27.🧮 Resistors of 47 Ω and 68 Ω are joined in series. What is the total resistance (in ohms)?
28. 28.True or false: on a cell, “the longer symbol line” means the − (negative) end. (a) False (b) True
29. 29.⚡ A solar panel changes which kind of energy into electricity? (a) chemical energy (b) sound energy (c) light energy (d) wind energy
30. 30.⚡ A home appliance on the 230 V mains takes 1.5 A. What is its power (in watts)?
31. 31.Which of these is an output? (a) a turning knob (b) a push button (c) a small display (d) a motion sensor
32. 32.🔁 count = 5
    repeat 2 times { count = count + 9 }
    What is count at the end?
33. 33.Which of these is a conductor? (a) a steel coin (b) a plastic ruler (c) a wooden stick (d) a paper strip
34. 34.🌐 A soil sensor sends a reading to an app every 10 minutes. How many readings arrive in 4 hours?
35. 35.What does a tilt switch do? (a) flips up or down (b) closes when tipped over (c) slides side to side (d) works only while pressed
36. 36.🤖 Microcontroller or laptop: which one runs one small program? (a) laptop (b) microcontroller
37. 37.🗺️ In an input → process → output plan, is “a light level reading” the input, the process or the output? (a) input (b) output (c) process
38. 38.⚡ Power tells us … (a) the length of a wire (b) the colour of light (c) energy used each second (d) the size of a cell
39. 39.What does a fuse do? (a) blows if current is high (b) limits the current (c) stores a little charge (d) turns a fan or wheels
40. 40.📏 Which unit measures energy used each second? (a) volt (V) (b) ohm (Ω) (c) watt (W) (d) ampere (A)

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