Electronics Worksheet: Final Test

Electronics lesson 30: Final electronics test · Set 832 · 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: a steel spoon is a conductor. (a) False (b) True
2. 2.🧮 Two equal 100 Ω resistors are joined in parallel. What is the total resistance (in ohms)?
3. 3.🌈 A gold fourth band on a resistor means the value may be off by … (a) 50 % (b) 5 % (c) 0 % (d) 25 %
4. 4.Which of these mainly gives out heat? (a) a ceiling fan (b) a water heater (c) a traffic signal (d) a torch
5. 5.⏱️ repeat 8 times { buzzer ON; wait 600 ms; buzzer OFF; wait 700 ms }
   How many milliseconds does this take in all?
6. 6.🔺 A current of 0.2 A flows through a 10 Ω resistor. What is the voltage across it (in volts)? =
7. 7.🔍 Which is the odd one out? (a) run fans in empty rooms (b) switch off empty rooms (c) iron one shirt at a time (d) leave the TV on standby
8. 8.⚡ A device works on 6 V and takes 0.1 A. What is its power (in watts)? =
9. 9.🔦 A tester circuit has a new cell, a good bulb and wires with a gap between two clips. We put a plastic ruler across the gap. Does the bulb glow? (a) No (b) Yes
10. 10.⚙️ What is an actuator? (a) an output that acts (b) a sensor (c) a battery (d) a program
11. 11.🔌 Is a servo motor an input or an output for a microcontroller? (a) output (b) input
12. 12.💡 4 identical bulbs are joined in series with a battery and a closed switch on the main wire. Bulb 4 is taken out of its holder. How many bulbs glow?
13. 13.⚡ Which formula gives electric power? (a) P = V × I (b) P = V + I (c) P = I ÷ V (d) P = V ÷ I
14. 14.True or false: if a cell is taken out, the circuit is closed and current flows. (a) False (b) True
15. 15.🔌 Why are electric wires covered in plastic? (a) plastic is a conductor (b) to make them heavy (c) plastic makes current (d) plastic is an insulator
16. 16.🗺️ In an input → process → output plan, is “a buzzer beeps” the input, the process or the output? (a) output (b) process (c) input
17. 17.💡 5 identical bulbs are joined in series with a battery and a closed switch on the main wire. Bulb 2 is taken out of its holder. Does bulb 1 glow? (a) No (b) Yes
18. 18.🤖 Microcontroller or laptop: which one has a built-in keyboard? (a) microcontroller (b) laptop
19. 19.💡 4 identical bulbs are joined in series with a battery and a closed switch on the main wire. All the bulbs are in place. How many bulbs glow?
20. 20.🔘 Which kind of switch works only while pressed? (a) a slide switch (b) a push button (c) a reed switch (d) a toggle switch
21. 21.⚠️ Is it safe to throw cells in a fire? (a) safe (b) not safe
22. 22.🤖 if (temperature > 32) { show “Hot” } else if (temperature > 22) { show “Warm” } else { show “Cool” }
    The temperature is 14 °C. What is shown? (a) Cool (b) Warm (c) Hot
23. 23.🤖 Does a digital thermometer usually have a microcontroller inside? (a) No (b) Yes
24. 24.📏 How many watts (W) is 0.9 kW?
25. 25.Which of these mainly gives out light? (a) a rice cooker (b) a school bell (c) a traffic signal (d) a mixer grinder
26. 26.🔍 Which is the odd one out? (a) check if temp > 30 (b) count button presses (c) decide if soil is dry (d) a buzzer beeps
27. 27.True or false: a toggle switch works only while pressed. (a) True (b) False
28. 28.💡 Does it save or waste electricity to unplug idle chargers? (a) wastes electricity (b) saves electricity
29. 29.💡 3 identical bulbs are joined in series with a 3 V battery (ideal wires). How many volts does each bulb get? =
30. 30.🌈 A resistor has the colour bands blue, black, red. What is its value in kilo-ohms (kΩ)? =
31. 31.🔍 Which is the odd one out? (a) share camera links (b) change default passwords (c) accept every permission (d) ignore update messages
32. 32.🔗 Series or parallel circuit: “bulbs share the voltage”? (a) parallel (b) series
33. 33.🧾 One “unit” on an electricity bill is … (a) 1 volt (b) 1 kilowatt-hour (kWh) (c) 1 ampere (d) 1 watt
34. 34.🔍 Which is the odd one out? (a) a tube light (b) a street light (c) a mixer grinder (d) a torch
35. 35.⏱️ loop forever { LED ON; wait 600 ms; LED OFF; wait 450 ms }
    How many milliseconds does one blink (ON + OFF) take?
36. 36.🤖 Does a washing machine usually have a microcontroller inside? (a) Yes (b) No
37. 37.True or false: triangle against a bar is the symbol for a bulb. (a) True (b) False
38. 38.True or false: a microcontroller uses very little power. (a) False (b) True
39. 39.True or false: “decide if soil is dry” is the input. (a) False (b) True
40. 40.🔐 Is it a good or a risky habit to share the Wi-Fi key? (a) good habit (b) risky habit

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