Electronics Worksheet: Final Test

Electronics lesson 30: Final electronics test · Set 127 · 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.💡 On an LED, is the shorter leg the anode (+) or the cathode (−)? (a) cathode (−) (b) anode (+)
2. 2.True or false: a line lifted at a gap is the symbol for a switch. (a) True (b) False
3. 3.📏 How many kilo-ohms (kΩ) is 3000 Ω? =
4. 4.🔍 Which is the odd one out? (a) a pencil sharpener (b) a paper calendar (c) a Wi-Fi smart plug (d) a battery torch
5. 5.Which drawing is the symbol for a voltmeter? (a) two equal parallel lines (b) a line lifted at a gap (c) a small empty box (d) a circle with V inside
6. 6.🧮 A 3.75 V battery is joined to 3 Ω and 12 Ω resistors in series. What current flows (in amperes)? =
7. 7.⚡ Which formula gives electric power? (a) P = V + I (b) P = V × I (c) P = I ÷ V (d) P = V ÷ I
8. 8.⚠️ About how many volts do home sockets in India supply? (a) 12 V (b) 1.5 V (c) 230 V (d) 9 V
9. 9.🔌 Is a rubber band a conductor or an insulator? (a) a conductor (b) an insulator
10. 10.🧩 Which part changes electrical energy into movement? (a) a fuse (b) an LED (c) a motor (d) a resistor
11. 11.🤖 if (light < 300 AND motion) { porch lamp ON } else { porch lamp OFF }
    The light reading is 70 and motion is detected (true). What happens? (a) porch lamp OFF (b) porch lamp ON
12. 12.🧾 Which lamp gives the same light for the least power? (a) an LED lamp (b) a filament bulb (c) a candle (d) an oil lamp
13. 13.🤖 if (temperature > 35) { show “Hot” } else if (temperature > 21) { show “Warm” } else { show “Cool” }
    The temperature is 22 °C. What is shown? (a) Hot (b) Warm (c) Cool
14. 14.🤖 if (temperature > 28) { fan ON } else { fan OFF }
    The temperature sensor reads 29 °C. What happens? (a) fan ON (b) fan OFF
15. 15.True or false: a straight line is the symbol for a capacitor. (a) True (b) False
16. 16.🗺️ In “input → process → output”, which part is the decision the program makes? (a) the battery (b) the output (c) the process (d) the input
17. 17.✏️ In a cell symbol, which line is the + terminal? (a) neither line (b) both lines (c) the longer line (d) the shorter line
18. 18.🔁 What does “count = count + 1” do? (a) takes 1 away (b) prints 1 (c) sets count to 1 (d) adds 1 to count
19. 19.True or false: “a break stops every bulb” is true of a series circuit. (a) True (b) False
20. 20.Which of these is a good habit? (a) reuse one password (b) read app permissions (c) share the Wi-Fi key (d) tap unknown app links
21. 21.🔢 To get a sensor reading onto a phone, which is the LAST step? (a) the app shows it (b) the board reads it (c) the sensor measures (d) it is sent by Wi-Fi
22. 22.Which of these is true of a series circuit? (a) one out, the rest glow (b) one bulb out, all go out (c) many paths for current (d) each gets the full volts
23. 23.True or false: “one bulb out, all go out” is true of a parallel circuit. (a) True (b) False
24. 24.True or false: to switch on with a clap, use a light sensor. (a) True (b) False
25. 25.🤖 Microcontroller or laptop: which one runs many apps at once? (a) laptop (b) microcontroller
26. 26.🔍 Which is the odd one out? (a) reuse one password (b) tap unknown app links (c) turn off unused gadgets (d) ignore update messages
27. 27.🔗 Series or parallel circuit: “one bulb out, all go out”? (a) parallel (b) series
28. 28.🧮 A 0.8 V battery is joined to 2 Ω and 2 Ω resistors in series. What current flows (in amperes)? =
29. 29.Which of these means the circuit is closed? (a) a wire is cut (b) a cell is taken out (c) all wires are joined (d) a wire has come loose
30. 30.🔦 A tester circuit has a new cell, a good bulb and wires with a gap between two clips. We put a copper wire across the gap. Does the bulb glow? (a) Yes (b) No
31. 31.🔋 How many 1.5 V cells must be joined in series to give 10.5 V?
32. 32.True or false: if a wire has come loose, the circuit is closed and current flows. (a) True (b) False
33. 33.True or false: to open blinds at sunrise, use a temperature sensor. (a) False (b) True
34. 34.True or false: “one bulb out, all go out” is true of a series circuit. (a) True (b) False
35. 35.🧮 Resistors of 470 Ω and 22 Ω are joined in series. What is the total resistance (in ohms)?
36. 36.🔍 Which is the odd one out? (a) an LED (b) a small display (c) a servo motor (d) a motion sensor
37. 37.Which of these is a good habit? (a) tap unknown app links (b) keep factory passwords (c) share only needed data (d) reuse one password
38. 38.🤖 Microcontroller or laptop: which one runs one small program? (a) laptop (b) microcontroller
39. 39.💡 Old festival light strings went fully dark when one bulb failed. How were they joined? (a) by Wi-Fi (b) not joined (c) in parallel (d) in series
40. 40.🔁 Is the circuit closed or open if all wires are joined? (a) closed (b) open

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