Electronics Worksheet: Final Test

Electronics lesson 30: Final electronics test · Set 543 · 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.Which of these is an insulator? (a) an iron nail (b) a metal paper clip (c) a woollen thread (d) a copper wire
2. 2.🔌 Is a copper wire a conductor or an insulator? (a) an insulator (b) a conductor
3. 3.🤖 How does a new program get onto a microcontroller board? (a) typed on the chip (b) drawn with a pen (c) uploaded over USB (d) sent by sound
4. 4.True or false: a transistor lets current go one way. (a) True (b) False
5. 5.🔋 Does a water pump give electricity or use electricity? (a) gives electricity (b) uses electricity
6. 6.🔢 To run one loop of a plant-watering program, which is the LAST step? (a) switch the pump on/off (b) wait a few seconds (c) compare with the limit (d) read the soil sensor
7. 7.🌐 A weather station sends one reading every 5 seconds. How many readings does it send in 3 minutes?
8. 8.🧾 One “unit” on an electricity bill is … (a) 1 ampere (b) 1 volt (c) 1 kilowatt-hour (kWh) (d) 1 watt
9. 9.🔺 A 6 V supply is joined across a 4 Ω resistor. What current flows (in amperes)? =
10. 10.True or false: two equal parallel lines is the symbol for a capacitor. (a) False (b) True
11. 11.🤖 “if (A AND B)” is true when … (a) only A is true (b) both are false (c) only B is true (d) both A and B are true
12. 12.🔺 A current of 10 mA flows when 2 V is joined across a resistor. What is its resistance (in ohms)?
13. 13.🔍 Which is the odd one out? (a) a Wi-Fi weather station (b) a Wi-Fi doorbell camera (c) a smart energy meter (d) a paper calendar
14. 14.💡 A battery lights 3 identical bulbs joined in series. One more identical bulb is added in series. How do the bulbs glow now? (a) dimmer (b) brighter (c) the same
15. 15.✏️ In a cell symbol, which line is the + terminal? (a) the shorter line (b) the longer line (c) neither line (d) both lines
16. 16.🔗 Series or parallel circuit: “bulbs share the voltage”? (a) parallel (b) series
17. 17.🔍 A distance sensor sends a sound pulse and hears the echo 12 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
18. 18.True or false: on an LED, the round-side leg is the anode (+). (a) False (b) True
19. 19.💡 A blue LED uses 3 V and should get 10 mA. It runs from a 6 V supply. What resistor (in ohms) is needed in series?
20. 20.Which of these has no microcontroller inside? (a) a washing machine (b) a toy robot (c) a bicycle bell (d) a smart watch
21. 21.Which of these is a conductor? (a) a glass marble (b) a dry cork (c) a rubber eraser (d) a safety pin
22. 22.⚡ A device works on 5 V and takes 1 A. What is its power (in watts)? =
23. 23.🔢 To plan an electronics project, what comes right after “draw the circuit diagram”? (a) pick a problem to solve (b) build it with an adult (c) test it and fix it (d) list inputs and outputs
24. 24.🔘 Which kind of switch flips up or down? (a) a toggle switch (b) a tilt switch (c) a push button (d) a reed switch
25. 25.🌈 In the resistor colour code, which number does grey stand for?
26. 26.⚡ A 1.25 W device works on 5 V. What current does it take (in amperes)? =
27. 27.Which of these is measured in volts (V)? (a) resistance (b) the flow of charge (c) voltage (d) energy used each second
28. 28.⏱️ How many milliseconds are in 1 second? (a) 60 (b) 100 (c) 1000 (d) 10
29. 29.Which of these is not safe? (a) throw cells in a fire (b) build with an adult near (c) stop if a part gets hot (d) stay away from pylons
30. 30.⚡ A home appliance on the 230 V mains takes 4 A. What is its power (in watts)?
31. 31.🔁 Is the circuit closed or open if the bulb is unscrewed? (a) open (b) closed
32. 32.⚡ Power tells us … (a) the colour of light (b) the size of a cell (c) the length of a wire (d) energy used each second
33. 33.⚙️ What is an actuator? (a) a sensor (b) a battery (c) a program (d) an output that acts
34. 34.🔁 Is the circuit closed or open if the switch is ON? (a) open (b) closed
35. 35.🔐 Is it a good or a risky habit to share the Wi-Fi key? (a) good habit (b) risky habit
36. 36.🌈 Which colour bands (1st digit, 2nd digit, multiplier) mark a 470 Ω resistor? (a) yellow-violet-black (b) yellow-violet-brown (c) violet-yellow-brown (d) yellow-violet-red
37. 37.🔺 A 20 V supply is joined across a 500 Ω resistor. What current flows (in milliamperes, mA)?
38. 38.💡 Why is house wiring done in parallel? (a) to save copper only (b) each gets full voltage (c) to make bulbs dim (d) so all go off together
39. 39.True or false: a dot where wires meet is the symbol for a capacitor. (a) False (b) True
40. 40.⚡ A 1.5 W device works on 1.5 V. What current does it take (in amperes)? =

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