Electronics Worksheet: Final Test

Electronics lesson 30: Final electronics test · Set 511 · 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.🌐 In an IoT system, which part acts on a command? (a) actuator (b) cloud server (c) sensor (d) phone app
2. 2.🔘 A cell, a bulb and switches A and B are joined one after another in a single loop (series). A is OFF and B is ON. Does the bulb glow? (a) Yes (b) No
3. 3.🧮 Two equal 40 Ω resistors are joined in parallel. What is the total resistance (in ohms)?
4. 4.Which of these is an insulator? (a) a safety pin (b) a woollen thread (c) a brass key (d) a copper wire
5. 5.✏️ In a circuit diagram, which part is drawn as a line lifted at a gap? (a) junction (b) ammeter (c) switch (d) cell
6. 6.🔗 Series or parallel circuit: “a single current path”? (a) parallel (b) series
7. 7.📏 In the water-pipe picture of a circuit, current is like … (a) a narrow pipe (b) the water pressure (c) the pipe colour (d) the flow of water
8. 8.True or false: if the bulb is unscrewed, the circuit is closed and current flows. (a) False (b) True
9. 9.Which of these has no microcontroller inside? (a) a wind-up toy (b) a TV remote (c) a washing machine (d) a digital alarm clock
10. 10.True or false: a circle with a cross is the symbol for a bulb. (a) False (b) True
11. 11.🔍 Which is the odd one out? (a) a temperature reading (b) compare with a limit (c) a light level reading (d) a soil moisture reading
12. 12.🔗 Series or parallel circuit: “each gets the full volts”? (a) parallel (b) series
13. 13.True or false: if the switch is ON, the circuit is open and no current flows. (a) True (b) False
14. 14.📶 Digital or analog: many values in a range? (a) analog (b) digital
15. 15.True or false: “many paths for current” is true of a parallel circuit. (a) True (b) False
16. 16.🔘 Switch A is on the main wire next to the cell and the bulb; then the wire splits into two side-by-side paths, one with switch B and one with switch C. A is ON, B is ON and C is ON. Does the bulb glow? (a) Yes (b) No
17. 17.🔋 How many 2 V cells must be joined in series to give 6 V?
18. 18.🔋 Identical cells side by side (in parallel) give … (a) the same voltage (b) double the voltage (c) half the voltage (d) no voltage
19. 19.🌐 Is a Wi-Fi weather station an IoT device? (a) an IoT device (b) not an IoT device
20. 20.True or false: “an alert on the phone” is the output. (a) True (b) False
21. 21.🔋 On a cell, does “the longer symbol line” mean the + end or the − end? (a) + (positive) (b) − (negative)
22. 22.🤖 if (temperature > 34) { show “Hot” } else if (temperature > 26) { show “Warm” } else { show “Cool” }
    The temperature is 19 °C. What is shown? (a) Cool (b) Warm (c) Hot
23. 23.🔁 What does a variable do in a program? (a) measures light (b) joins two wires (c) stores a value (d) blinks an LED
24. 24.True or false: to share only needed data is a risky habit. (a) False (b) True
25. 25.🔁 repeat 4 times { repeat 3 times { beep } }
    How many beeps are there?
26. 26.True or false: to accept every permission is a risky habit. (a) False (b) True
27. 27.True or false: if a cell is taken out, the circuit is open and no current flows. (a) False (b) True
28. 28.🔺 A 7.5 V supply is joined across a 3 Ω resistor. What current flows (in amperes)? =
29. 29.🔺 An 18.8 V supply is joined across a 470 Ω resistor. What current flows (in milliamperes, mA)?
30. 30.💡 A battery lights 3 identical bulbs joined in series. One more identical bulb is added in series. How do the bulbs glow now? (a) brighter (b) the same (c) dimmer
31. 31.🔺 A 1.2 V supply is joined across a 120 Ω resistor. What current flows (in milliamperes, mA)?
32. 32.⚡ What does a school bell mainly change electricity into? (a) sound (b) light (c) movement (d) heat
33. 33.Which of these is not safe? (a) dry your hands first (b) stay away from pylons (c) stop if a part gets hot (d) touch a switch when wet
34. 34.🌈 A resistor has the colour bands white, green, black. What is its value (in ohms)?
35. 35.🔁 count = 5
    while (count < 26) { count = count + 3 }
    How many times does the loop run?
36. 36.⏱️ repeat 7 times { buzzer ON; wait 300 ms; buzzer OFF; wait 400 ms }
    How many milliseconds does this take in all?
37. 37.🔘 Which kind of switch closes when tipped over? (a) a tilt switch (b) a toggle switch (c) a slide switch (d) a reed switch
38. 38.🔍 Which sensor would you use to start a fan when hot? (a) a distance sensor (b) a light sensor (c) a temperature sensor (d) a motion sensor
39. 39.Which of these mainly makes sound? (a) a table fan (b) a ceiling fan (c) a loudspeaker (d) a rice cooker
40. 40.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 2 hours. How many watt-hours (Wh) are saved?

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