Electronics Worksheet: Final Test

Electronics lesson 30: Final electronics test · Set 670 · 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 formula gives electric power? (a) P = V × I (b) P = V ÷ I (c) P = I ÷ V (d) P = V + I
2. 2.🧭 Which part of a microcontroller board connect sensors and LEDs? (a) the USB port (b) the power LED (c) the pins (d) the reset button
3. 3.🧮 Adding another resistor in series makes the total resistance … (a) bigger (b) zero (c) smaller (d) stay the same
4. 4.True or false: a plastic straw is a conductor. (a) False (b) True
5. 5.🌈 A gold fourth band on a resistor means the value may be off by … (a) 50 % (b) 0 % (c) 25 % (d) 5 %
6. 6.💡 Why is house wiring done in parallel? (a) to make bulbs dim (b) to save copper only (c) so all go off together (d) each gets full voltage
7. 7.🔍 For a microcontroller, is a sensor an input or an output? (a) a power source (b) an output (c) an input (d) a fuse
8. 8.🤖 if (light < 400 OR motion) { porch lamp ON } else { porch lamp OFF }
   The light reading is 270 and motion is not detected (false). What happens? (a) porch lamp OFF (b) porch lamp ON
9. 9.🌐 A weather station sends one reading every 10 seconds. How many readings does it send in 1 minute?
10. 10.🤖 if (temperature > 32) { fan ON } else { fan OFF }
    The temperature sensor reads 26 °C. What happens? (a) fan ON (b) fan OFF
11. 11.Which of these mainly makes movement? (a) a tube light (b) a street light (c) an exhaust fan (d) a toaster
12. 12.💡 4 identical bulbs are joined in series with a 4 V battery (ideal wires). How many volts does each bulb get? =
13. 13.🔋 A 3 V battery and two 1.5 V cells are joined in series, all facing the same way. What is the total voltage (in volts)? =
14. 14.🗺️ In an input → process → output plan, is “a motion sensor signal” the input, the process or the output? (a) output (b) input (c) process
15. 15.⚡ What does a torch mainly change electricity into? (a) movement (b) sound (c) heat (d) light
16. 16.🔋 How many 1.5 V cells must be joined in series to give 12 V?
17. 17.Which of these means the circuit is open? (a) the switch is ON (b) a wire is cut (c) all wires are joined (d) the loop is complete
18. 18.🔦 A tester circuit has a new cell, a good bulb and wires with a gap between two clips. We put a woollen thread across the gap. Does the bulb glow? (a) Yes (b) No
19. 19.🔋 Does a mobile phone give electricity or use electricity? (a) uses electricity (b) gives electricity
20. 20.🤖 if (light < 200 AND motion) { porch lamp ON } else { porch lamp OFF }
    The light reading is 230 and motion is not detected (false). What happens? (a) porch lamp OFF (b) porch lamp ON
21. 21.⚠️ Is it safe to fly kites in open fields? (a) not safe (b) safe
22. 22.🌈 Which band is read first on a resistor? (a) the one nearest an end (b) any band (c) the widest gap (d) the gold band
23. 23.Which of these usually has a microcontroller inside? (a) a bicycle bell (b) a hand pump (c) a candle (d) a digital alarm clock
24. 24.🤖 if (temperature > 28) { fan ON } else { fan OFF }
    The temperature sensor reads 33 °C. What happens? (a) fan ON (b) fan OFF
25. 25.🤖 What is a microcontroller? (a) a computer on one chip (b) a type of battery (c) a kind of bulb (d) a big desktop computer
26. 26.Which of these is the input? (a) a light level reading (b) decide if soil is dry (c) an LED lights up (d) check if temp > 30
27. 27.True or false: an LDR blows if current is high. (a) True (b) False
28. 28.🔐 Is it a good or a risky habit to tap unknown app links? (a) good habit (b) risky habit
29. 29.🔋 6 identical 1.5 V cells are joined in series, but one of them is put in the wrong way round. What is the total voltage now (in volts)? =
30. 30.Which of these mainly gives out light? (a) a school bell (b) an electric drill (c) an electric kettle (d) an LED lamp
31. 31.⚡ What does a ceiling fan mainly change electricity into? (a) movement (b) sound (c) heat (d) light
32. 32.🔺 A current of 0.1 A flows when 0.8 V is joined across a resistor. What is its resistance (in ohms)?
33. 33.Which job needs a motion sensor? (a) warn of a gas leak (b) spot someone walking in (c) start a fan when hot (d) water a dry plant
34. 34.📏 Which unit measures voltage? (a) ampere (A) (b) watt (W) (c) volt (V) (d) ohm (Ω)
35. 35.🔘 When a switch is ON, the circuit is … (a) broken (b) cut (c) open (d) closed
36. 36.Which of these is measured in amperes (A)? (a) current (b) voltage (c) power (d) energy used each second
37. 37.🌈 In the resistor colour code, which number does black stand for?
38. 38.True or false: to post your live location is a risky habit. (a) True (b) False
39. 39.⏱️ loop forever { LED ON; wait 50 ms; LED OFF; wait 200 ms }
    How many times does the LED blink in 6 seconds?
40. 40.🧮 A 7 V battery is joined to 8 Ω and 6 Ω resistors in series. What current flows (in amperes)? =

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