Electronics Worksheet: Final Test

Electronics lesson 30: Final electronics test · Set 220 · 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.True or false: a ceiling fan mainly makes sound. (a) False (b) True
2. 2.📏 In the water-pipe picture of a circuit, voltage is like … (a) the pipe colour (b) the water pressure (c) the water tank lid (d) the tap handle
3. 3.🗺️ In an input → process → output plan, is “a motion sensor signal” the input, the process or the output? (a) process (b) output (c) input
4. 4.🤖 Microcontroller or laptop: which one uses very little power? (a) laptop (b) microcontroller
5. 5.🤖 Microcontroller or laptop: which one runs one small program? (a) laptop (b) microcontroller
6. 6.🧾 A family uses 70 units of electricity in a month and each unit costs ₹4. What is the bill (in ₹)?
7. 7.🤖 if (temperature > 38) { show “Hot” } else if (temperature > 22) { show “Warm” } else { show “Cool” }
   The temperature is 28 °C. What is shown? (a) Hot (b) Cool (c) Warm
8. 8.🔋 A 12 V battery and four 1.5 V cells are joined in series, all facing the same way. What is the total voltage (in volts)? =
9. 9.🔋 On a cell, does “the longer symbol line” mean the + end or the − end? (a) + (positive) (b) − (negative)
10. 10.📶 How many states can a digital pin have? (a) two (b) a thousand (c) ten (d) one
11. 11.🔢 To get a sensor reading onto a phone, which comes first: “the app shows it” or “the board reads it”? (a) the app shows it (b) the board reads it
12. 12.💡 6 identical bulbs are joined in series with a battery and a closed switch on the main wire. Bulb 6 is taken out of its holder. How many bulbs glow?
13. 13.🔁 Is the circuit closed or open if the loop is complete? (a) closed (b) open
14. 14.True or false: a steel spoon is an insulator. (a) True (b) False
15. 15.🔋 8 identical 1.2 V cells are joined in series (+ of one cell to − of the next). What is the total voltage (in volts)? =
16. 16.📏 Voltmeter or ammeter: which one is joined in series? (a) voltmeter (b) ammeter
17. 17.True or false: on a cell, “the end with a bump” means the + (positive) end. (a) False (b) True
18. 18.Which of these is the input? (a) count button presses (b) check if temp > 30 (c) an LED lights up (d) a temperature reading
19. 19.🤖 Does a hand pump usually have a microcontroller inside? (a) Yes (b) No
20. 20.⏱️ How many milliseconds is a wait of 4.8 seconds?
21. 21.True or false: “bulbs share the voltage” is true of a parallel circuit. (a) True (b) False
22. 22.🔌 A gap of dry air between two wires acts as … (a) a conductor (b) a switch that is ON (c) a cell (d) an insulator
23. 23.💡 Does it save or waste electricity to use daylight to read? (a) wastes electricity (b) saves electricity
24. 24.🌐 A soil sensor sends a reading to an app every 5 minutes. How many readings arrive in 5 hours?
25. 25.True or false: to switch on with a clap, use a temperature sensor. (a) False (b) True
26. 26.🗺️ In an input → process → output plan, is “an alert on the phone” the input, the process or the output? (a) process (b) output (c) input
27. 27.🔘 A bulb and a cell are joined through 6 switches one after another in a single loop (series). What is the smallest number of switches that must be ON to light the bulb?
28. 28.⏱️ loop forever { LED ON; wait 200 ms; LED OFF; wait 50 ms }
    How many times does the LED blink in 3 seconds?
29. 29.Which of these wastes electricity? (a) use daylight to read (b) use LED lamps (c) switch off empty rooms (d) use old filament bulbs
30. 30.Which of these gives us electricity? (a) a refrigerator (b) a battery (c) a mobile phone (d) a television
31. 31.🤖 if (light < 400 AND motion) { porch lamp ON } else { porch lamp OFF }
    The light reading is 280 and motion is detected (true). What happens? (a) porch lamp ON (b) porch lamp OFF
32. 32.🔍 Which is the odd one out? (a) leave the TV on standby (b) use daylight to read (c) set the AC to 24 °C (d) switch off empty rooms
33. 33.🔺 A current of 10 mA flows through a 220 Ω resistor. What is the voltage across it (in volts)? =
34. 34.🔐 Is it a good or a risky habit to accept every permission? (a) good habit (b) risky habit
35. 35.True or false: on a cell, “the flat end” means the − (negative) end. (a) True (b) False
36. 36.Which of these is the process? (a) a buzzer beeps (b) a soil moisture reading (c) a button press (d) count button presses
37. 37.Which of these is safe? (a) open a phone charger (b) throw cells in a fire (c) build with an adult near (d) use a cable with cuts
38. 38.🧮 Two resistors in parallel give a total that is … (a) more than either one (b) always zero (c) their sum (d) less than either one
39. 39.🔁 total = 0
    for i = 1 to 12 { total = total + i }
    What is total at the end?
40. 40.💡 4 identical bulbs are joined in series with a battery and a closed switch on the main wire. Bulb 1 is taken out of its holder. How many bulbs glow?

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