Electronics Worksheet: Final Test

Electronics lesson 30: Final electronics test · Set 975 · 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.🤖 Does a spinning top usually have a microcontroller inside? (a) No (b) Yes
2. 2.🔍 Which is the odd one out? (a) an iron nail (b) a copper wire (c) a ceramic cup (d) a steel spoon
3. 3.💡 Does it save or waste electricity to unplug idle chargers? (a) wastes electricity (b) saves electricity
4. 4.Which job is done by the power LED? (a) keeps the voltage steady (b) connect sensors and LEDs (c) shows the board is on (d) brings power and code
5. 5.🗺️ In “input → process → output”, which part is the decision the program makes? (a) the battery (b) the output (c) the input (d) the process
6. 6.True or false: “own switch for each bulb” is true of a series circuit. (a) False (b) True
7. 7.🌐 Is a smart energy meter an IoT device? (a) not an IoT device (b) an IoT device
8. 8.🔁 count = 5
   while (count < 13) { count = count + 2 }
   How many times does the loop run?
9. 9.💡 An LED (with its resistor) is on pin 8. All pins start LOW. The program runs once:
   set pin 7 HIGH
   set pin 8 HIGH
   set pin 8 HIGH
   Is the LED ON or OFF at the end? (a) ON (b) OFF
10. 10.🌈 A resistor has the colour bands red, white, brown. What is its value (in ohms)?
11. 11.💡 Why does an LED need a resistor in series? (a) to make it brighter (b) to store charge (c) to change its colour (d) to limit the current
12. 12.⚡ Which formula gives electric power? (a) P = I ÷ V (b) P = V + I (c) P = V ÷ I (d) P = V × I
13. 13.🔺 In the V-I-R triangle, how do we find R? (a) R = V ÷ I (b) R = I ÷ V (c) R = V × I (d) R = V + I
14. 14.🔍 Which is the odd one out? (a) unplug idle chargers (b) set the AC to 24 °C (c) leave the TV on standby (d) switch off empty rooms
15. 15.🔺 A 0.8 V supply is joined across a 4 Ω resistor. What current flows (in amperes)? =
16. 16.🌈 A resistor has the colour bands white, blue, black. What is its value (in ohms)?
17. 17.Which of these is an IoT device? (a) an app-controlled bulb (b) a pencil sharpener (c) a plain table fan (d) a plain wall switch
18. 18.🔌 A gap of dry air between two wires acts as … (a) a conductor (b) an insulator (c) a cell (d) a switch that is ON
19. 19.🔺 The voltage stays the same and the resistance gets bigger. The current … (a) gets bigger (b) stays the same (c) gets smaller (d) becomes zero
20. 20.🔌 Why are electric wires covered in plastic? (a) to make them heavy (b) plastic is a conductor (c) plastic is an insulator (d) plastic makes current
21. 21.True or false: to set up with a parent is a risky habit. (a) True (b) False
22. 22.💡 4 identical bulbs are joined in series with a battery and a closed switch on the main wire. All the bulbs are in place. Does bulb 1 glow? (a) Yes (b) No
23. 23.🔁 Is the circuit closed or open if all wires are joined? (a) open (b) closed
24. 24.Which job needs a pump? (a) spin a robot’s wheels (b) show a status light (c) turn to an exact angle (d) move water to plants
25. 25.True or false: triangle, bar and arrows is the symbol for an LED. (a) True (b) False
26. 26.🔍 Which is the odd one out? (a) a Wi-Fi weather station (b) a wind-up clock (c) a paper calendar (d) a plain table fan
27. 27.True or false: on a cell, “the end with a bump” means the − (negative) end. (a) True (b) False
28. 28.💡 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
29. 29.⚡ A home appliance on the 230 V mains takes 1 A. What is its power (in watts)?
30. 30.True or false: the voltmeter measures voltage. (a) False (b) True
31. 31.🌈 A resistor has the colour bands yellow, orange, yellow. What is its value in kilo-ohms (kΩ)? =
32. 32.🌈 A gold fourth band on a resistor means the value may be off by … (a) 25 % (b) 50 % (c) 5 % (d) 0 %
33. 33.True or false: to leave the TV on standby saves electricity. (a) False (b) True
34. 34.True or false: if a cell is taken out, the circuit is closed and current flows. (a) False (b) True
35. 35.📏 In the water-pipe picture of a circuit, resistance is like … (a) a bigger tank (b) the water pressure (c) a narrow pipe (d) the flow of water
36. 36.Which drawing is the symbol for a motor? (a) a circle with M inside (b) a straight line (c) one tall, one short bar (d) a long and a short line
37. 37.What does a thermistor do? (a) boosts a small signal (b) senses how hot it is (c) blows if current is high (d) glows using little power
38. 38.🧩 Which part changes electrical energy into sound? (a) a diode (b) a resistor (c) a buzzer (d) a capacitor
39. 39.Which job is done by the USB port? (a) connect sensors and LEDs (b) brings power and code (c) restarts the program (d) keeps the voltage steady
40. 40.True or false: to switch off empty rooms saves electricity. (a) True (b) False

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