Electronics Worksheet: Final Test

Electronics lesson 30: Final electronics test · Set 436 · 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.🧮 Two equal 330 Ω resistors are joined in parallel. What is the total resistance (in ohms)?
2. 2.True or false: “a single current path” is true of a parallel circuit. (a) False (b) True
3. 3.🌐 What does IoT stand for? (a) Inside of Toys (b) Input of Tools (c) Internet of Things (d) Internet of Talk
4. 4.Which job is done by the pins? (a) connect sensors and LEDs (b) keeps the voltage steady (c) restarts the program (d) shows the board is on
5. 5.True or false: a microcontroller uses very little power. (a) False (b) True
6. 6.✏️ In a circuit diagram, which part is drawn as two equal parallel lines? (a) bulb (b) switch (c) voltmeter (d) capacitor
7. 7.Which of these has no microcontroller inside? (a) a bicycle bell (b) a toy robot (c) a digital thermometer (d) a digital alarm clock
8. 8.True or false: a hand pump usually has a microcontroller inside. (a) False (b) True
9. 9.🤖 if (light < 400 AND motion) { porch lamp ON } else { porch lamp OFF }
   The light reading is 340 and motion is not detected (false). What happens? (a) porch lamp ON (b) porch lamp OFF
10. 10.💡 A blue LED uses 3 V and should get 10 mA. It runs from a 12 V supply. What resistor (in ohms) is needed in series?
11. 11.🤖 if (temperature > 33) { show “Hot” } else if (temperature > 18) { show “Warm” } else { show “Cool” }
    The temperature is 42 °C. What is shown? (a) Hot (b) Warm (c) Cool
12. 12.🌐 A soil sensor sends a reading to an app every 30 minutes. How many readings arrive in 1 hour?
13. 13.🔁 Is the circuit closed or open if the switch is OFF? (a) closed (b) open
14. 14.🔋 Does a computer give electricity or use electricity? (a) uses electricity (b) gives electricity
15. 15.🔘 Which kind of switch flips up or down? (a) a toggle switch (b) a slide switch (c) a tilt switch (d) a reed switch
16. 16.Which job needs a distance sensor? (a) open blinds at sunrise (b) measure classroom noise (c) switch on lamps at dusk (d) make a parking alarm
17. 17.⚡ A bicycle dynamo changes which kind of energy into electricity? (a) movement energy (b) chemical energy (c) light energy (d) sound energy
18. 18.⚡ Power tells us … (a) the size of a cell (b) energy used each second (c) the length of a wire (d) the colour of light
19. 19.True or false: to fly kites in open fields is safe. (a) True (b) False
20. 20.🔍 For a microcontroller, is a sensor an input or an output? (a) an input (b) a fuse (c) an output (d) a power source
21. 21.🔌 Is a keypad an input or an output for a microcontroller? (a) input (b) output
22. 22.💡 Why is house wiring done in parallel? (a) so all go off together (b) each gets full voltage (c) to make bulbs dim (d) to save copper only
23. 23.🧮 Two equal 40 Ω resistors are joined in parallel. What is the total resistance (in ohms)?
24. 24.True or false: on an LED, the round-side leg is the cathode (−). (a) False (b) True
25. 25.🤖 if (light < 200) { lamp ON } else { lamp OFF }
    The light sensor reads 318. What happens? (a) lamp OFF (b) lamp ON
26. 26.🔋 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)? =
27. 27.💡 Does it save or waste electricity to leave fridge door open? (a) saves electricity (b) wastes electricity
28. 28.True or false: “HIGH or LOW only” is an analog signal. (a) False (b) True
29. 29.⏱️ loop forever { LED ON; wait 700 ms; LED OFF; wait 650 ms }
    How many milliseconds does one blink (ON + OFF) take?
30. 30.🧮 Resistors of 150 Ω, 220 Ω and 100 Ω are joined in series. What is the total resistance (in ohms)?
31. 31.💡 6 identical bulbs are joined in parallel (each on its own side-by-side path) with a battery and a closed switch on the main wire. Bulbs 2 and 4 are taken out of their holders. Does bulb 5 glow? (a) Yes (b) No
32. 32.⏱️ How many milliseconds are in 1 second? (a) 10 (b) 1000 (c) 60 (d) 100
33. 33.⚡ What does a school bell mainly change electricity into? (a) movement (b) sound (c) heat (d) light
34. 34.True or false: to throw cells in a fire is safe. (a) True (b) False
35. 35.True or false: on an LED, the leg by the flat edge is the anode (+). (a) False (b) True
36. 36.Which drawing is the symbol for a capacitor? (a) a circle with an X in it (b) a dot where wires meet (c) a long and a short line (d) two equal parallel lines
37. 37.✏️ In a cell symbol, which line is the + terminal? (a) the longer line (b) neither line (c) the shorter line (d) both lines
38. 38.🌈 Which colour bands (1st digit, 2nd digit, multiplier) mark an 870 Ω resistor? (a) grey-violet-brown (b) grey-violet-red (c) grey-violet-black (d) violet-grey-brown
39. 39.🌈 A resistor has the colour bands red, blue, red. What is its value (in ohms)?
40. 40.📏 How many milliamperes (mA) is 2.82 A?

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