Electronics Worksheet: Final Test

Electronics lesson 30: Final electronics test · Set 482 · 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.🌈 A resistor has the colour bands violet, white, orange. What is its value (in ohms)?
2. 2.🔺 A current of 40 mA flows when 8 V is joined across a resistor. What is its resistance (in ohms)?
3. 3.🔁 total = 0
   for i = 1 to 11 { total = total + i }
   What is total at the end?
4. 4.🔁 total = 0
   for i = 1 to 5 { total = total + i }
   What is total at the end?
5. 5.⏱️ How many milliseconds are in 1 second? (a) 100 (b) 10 (c) 60 (d) 1000
6. 6.🧮 Adding another resistor in series makes the total resistance … (a) zero (b) stay the same (c) bigger (d) smaller
7. 7.💡 On an LED, is the longer leg the anode (+) or the cathode (−)? (a) cathode (−) (b) anode (+)
8. 8.🧮 Resistors of 330 Ω and 20 Ω are joined in series. What is the total resistance (in ohms)?
9. 9.🌈 A gold fourth band on a resistor means the value may be off by … (a) 50 % (b) 25 % (c) 0 % (d) 5 %
10. 10.💡 An LED (with its resistor) is on pin 8. All pins start LOW. The program runs once:
    set pin 7 LOW
    set pin 7 HIGH
    Is the LED ON or OFF at the end? (a) OFF (b) ON
11. 11.🤖 In “if (temp > 30)”, what runs when temp is exactly 30? (a) both parts (b) the else part (c) the if part (d) neither part
12. 12.Which of these is a conductor? (a) a rubber band (b) a plastic ruler (c) aluminium foil (d) a woollen thread
13. 13.🤖 if (light < 200 AND motion) { porch lamp ON } else { porch lamp OFF }
    The light reading is 570 and motion is not detected (false). What happens? (a) porch lamp OFF (b) porch lamp ON
14. 14.True or false: a fuse glows using little power. (a) True (b) False
15. 15.🧮 Five equal 250 Ω resistors are joined in parallel. What is the total resistance (in ohms)?
16. 16.🔦 A tester circuit has a new cell, a good bulb and wires with a gap between two clips. We put a rubber eraser across the gap. Does the bulb glow? (a) No (b) Yes
17. 17.Which of these usually has a microcontroller inside? (a) a candle (b) a digital alarm clock (c) a wind-up toy (d) a spinning top
18. 18.🔺 A current of 1.5 A flows when 6 V is joined across a resistor. What is its resistance (in ohms)?
19. 19.🤖 if (temperature > 34) { show “Hot” } else if (temperature > 23) { show “Warm” } else { show “Cool” }
    The temperature is 13 °C. What is shown? (a) Hot (b) Cool (c) Warm
20. 20.What does a fuse do? (a) lets current go one way (b) senses how bright it is (c) is a resistance knob (d) blows if current is high
21. 21.💡 2 identical bulbs are joined in series with a 6 V battery (ideal wires). How many volts does each bulb get? =
22. 22.🤖 if (temperature > 30) { fan ON } else { fan OFF }
    The temperature sensor reads 25 °C. What happens? (a) fan OFF (b) fan ON
23. 23.📏 Which unit measures how much a part resists? (a) watt (W) (b) ampere (A) (c) ohm (Ω) (d) volt (V)
24. 24.🧩 Which component makes a beeping sound? (a) potentiometer (b) thermistor (c) LED (d) buzzer
25. 25.🔁 total = 0
    for i = 1 to 3 { total = total + i }
    What is total at the end?
26. 26.🔦 A tester circuit has a new cell, a good bulb and wires with a gap between two clips. We put a plastic straw across the gap. Does the bulb glow? (a) No (b) Yes
27. 27.🔌 Is a small display an input or an output for a microcontroller? (a) input (b) output
28. 28.🔢 To plan an electronics project, what comes right after “list inputs and outputs”? (a) test it and fix it (b) draw the circuit diagram (c) build it with an adult (d) pick a problem to solve
29. 29.⏱️ repeat 10 times { buzzer ON; wait 800 ms; buzzer OFF; wait 600 ms }
    How many milliseconds does this take in all?
30. 30.💡 A red LED uses 2 V and should get 20 mA. It runs from a 9 V supply. What resistor (in ohms) is needed in series?
31. 31.🧾 A 1000 W appliance runs for 6 hours. How many units (kWh) of electricity does it use? =
32. 32.🔋 Does a washing machine give electricity or use electricity? (a) gives electricity (b) uses electricity
33. 33.True or false: a capacitor limits the current. (a) False (b) True
34. 34.🤖 if (light < 300 OR motion) { porch lamp ON } else { porch lamp OFF }
    The light reading is 330 and motion is not detected (false). What happens? (a) porch lamp ON (b) porch lamp OFF
35. 35.🔦 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) Yes (b) No
36. 36.🗺️ In an input → process → output plan, is “an LED lights up” the input, the process or the output? (a) process (b) output (c) input
37. 37.⚡ A home appliance on the 230 V mains takes 5 A. What is its power (in watts)?
38. 38.🔋 8 identical 3 V cells are joined in series (+ of one cell to − of the next). What is the total voltage (in volts)? =
39. 39.🧮 A 50 Ω resistor is joined in series with two equal 10 Ω resistors that are in parallel with each other. What is the total resistance (in ohms)?
40. 40.🔗 Series or parallel circuit: “one out, the rest glow”? (a) series (b) parallel

Free electronics lessons, practice and worksheets at talentjr.in/electronics-for-kids