Electronics Worksheet: Final Test

Electronics lesson 30: Final electronics test · Set 662 · 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.📶 Digital or analog: how bright a room is? (a) digital (b) analog
2. 2.💡 3 identical bulbs are joined in parallel across a 6 V battery (ideal wires). How many volts does each bulb get? =
3. 3.🔍 Which is the odd one out? (a) reuse one password (b) log out of shared phones (c) accept every permission (d) keep factory passwords
4. 4.🤖 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
5. 5.🔢 To plan an electronics project, which comes first: “list inputs and outputs” or “draw the circuit diagram”? (a) draw the circuit diagram (b) list inputs and outputs
6. 6.⚡ What does an electric iron mainly change electricity into? (a) light (b) sound (c) movement (d) heat
7. 7.🔍 Which sensor would you use to keep an incubator warm? (a) a motion sensor (b) a gas sensor (c) a temperature sensor (d) a distance sensor
8. 8.🔌 Is a small display an input or an output for a microcontroller? (a) input (b) output
9. 9.🤖 if (light < 400 AND motion) { porch lamp ON } else { porch lamp OFF }
   The light reading is 70 and motion is detected (true). What happens? (a) porch lamp ON (b) porch lamp OFF
10. 10.🌈 Which colour bands (1st digit, 2nd digit, multiplier) mark a 220 Ω resistor? (a) red-orange-brown (b) red-red-black (c) red-red-brown (d) red-red-red
11. 11.🔁 Is the circuit closed or open if a wire has come loose? (a) open (b) closed
12. 12.⚡ Which formula gives electric power? (a) P = V ÷ I (b) P = I ÷ V (c) P = V + I (d) P = V × I
13. 13.🌈 In the resistor colour code, which number does violet stand for?
14. 14.🔍 Which is the odd one out? (a) use old filament bulbs (b) set the AC to 24 °C (c) use LED lamps (d) use daylight to read
15. 15.🧮 A 100 Ω resistor is joined in series with two equal 330 Ω resistors that are in parallel with each other. What is the total resistance (in ohms)?
16. 16.🔘 Two switches are in parallel (side by side). When does the bulb glow? (a) when either is ON (b) only when both are OFF (c) never (d) only when both are ON
17. 17.True or false: to use old filament bulbs wastes electricity. (a) True (b) False
18. 18.True or false: a torch mainly gives out light. (a) True (b) False
19. 19.Which of these is the process? (a) a light level reading (b) a motion sensor signal (c) compare with a limit (d) the fan starts
20. 20.🔐 Is it a good or a risky habit to share camera links? (a) good habit (b) risky habit
21. 21.🤖 if (light < 300 AND motion) { porch lamp ON } else { porch lamp OFF }
    The light reading is 540 and motion is not detected (false). What happens? (a) porch lamp OFF (b) porch lamp ON
22. 22.🔁 In an old-style bulb, which thin wire glows when current flows? (a) the switch (b) the glass (c) the base (d) the filament
23. 23.Which job needs a sound sensor? (a) open blinds at sunrise (b) warn of a gas leak (c) switch on with a clap (d) make a parking alarm
24. 24.What does a toggle switch do? (a) stays where you flip it (b) closes when tipped over (c) springs back when let go (d) works only while pressed
25. 25.⚡ Power tells us … (a) energy used each second (b) the length of a wire (c) the size of a cell (d) the colour of light
26. 26.🔁 count = 6
    repeat 5 times { count = count + 6 }
    What is count at the end?
27. 27.True or false: a ceiling fan mainly gives out light. (a) False (b) True
28. 28.📶 A pin set LOW gives about … (a) 5 V (b) 1.5 V (c) 0 V (d) 9 V
29. 29.🌈 A resistor has the colour bands brown, grey, orange. What is its value in kilo-ohms (kΩ)? =
30. 30.💡 An LED (with its resistor) is on pin 8. All pins start LOW. The program runs once:
    set pin 8 LOW
    set pin 8 LOW
    set pin 7 LOW
    Is the LED ON or OFF at the end? (a) OFF (b) ON
31. 31.🔦 A tester circuit has a new cell, a good bulb and wires with a gap between two clips. We put a graphite rod across the gap. Does the bulb glow? (a) No (b) Yes
32. 32.True or false: a woollen thread is an insulator. (a) False (b) True
33. 33.What does a buzzer do? (a) is a resistance knob (b) has coloured bands (c) limits the current (d) beeps for an alarm
34. 34.💡 An LED (with its resistor) is on pin 8. All pins start LOW. The program runs once:
    set pin 8 LOW
    set pin 7 HIGH
    Is the LED ON or OFF at the end? (a) ON (b) OFF
35. 35.🧾 A 200 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
36. 36.🔋 Identical cells side by side (in parallel) give … (a) the same voltage (b) half the voltage (c) double the voltage (d) no voltage
37. 37.💡 On an LED, is the round-side leg the anode (+) or the cathode (−)? (a) cathode (−) (b) anode (+)
38. 38.🔋 On a cell, does “the end with a bump” mean the + end or the − end? (a) − (negative) (b) + (positive)
39. 39.🔍 Which is the odd one out? (a) an LED lights up (b) count button presses (c) the fan starts (d) a buzzer beeps
40. 40.Which of these is an IoT device? (a) a plain table fan (b) a plain wall switch (c) a battery torch (d) a fitness band with app

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