Electronics Worksheet: Final Test

Electronics lesson 30: Final electronics test · Set 153 · 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.🧾 A family uses 90 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
2. 2.🧩 Which part changes electrical energy into sound? (a) a resistor (b) a diode (c) a capacitor (d) a buzzer
3. 3.True or false: if the bulb is unscrewed, the circuit is open and no current flows. (a) False (b) True
4. 4.🔋 6 identical 3 V cells are joined side by side in parallel (all + ends together, all − ends together). What is the voltage across them (in volts)? =
5. 5.🔺 A current of 2 A flows through a 6 Ω resistor. What is the voltage across it (in volts)? =
6. 6.🔁 total = 0
   for i = 1 to 3 { total = total + i }
   What is total at the end?
7. 7.🤖 Microcontroller or laptop: which one has a built-in keyboard? (a) microcontroller (b) laptop
8. 8.🌈 A resistor has the colour bands green, orange, black. What is its value (in ohms)?
9. 9.🌐 A weather station sends one reading every 60 seconds. How many readings does it send in 9 minutes?
10. 10.🔍 Which is the odd one out? (a) a pencil sharpener (b) a Wi-Fi weather station (c) a Wi-Fi doorbell camera (d) an app-controlled bulb
11. 11.🔐 Is it a good or a risky habit to accept every permission? (a) good habit (b) risky habit
12. 12.🔐 Privacy for a smart device means controlling … (a) its colour (b) its battery size (c) how loud it beeps (d) who can see your data
13. 13.🗺️ Before building a project, what should you write down first? (a) nothing at all (b) inputs and outputs (c) the box colour (d) the final price
14. 14.🤖 if (temperature > 25) { fan ON } else { fan OFF }
    The temperature sensor reads 32 °C. What happens? (a) fan ON (b) fan OFF
15. 15.🔋 Does a power station give electricity or use electricity? (a) gives electricity (b) uses electricity
16. 16.🌐 A weather station sends one reading every 10 seconds. How many readings does it send in 8 minutes?
17. 17.🤖 if (light < 200 AND motion) { porch lamp ON } else { porch lamp OFF }
    The light reading is 70 and motion is not detected (false). What happens? (a) porch lamp OFF (b) porch lamp ON
18. 18.💡 Does it save or waste electricity to set the AC to 24 °C? (a) wastes electricity (b) saves electricity
19. 19.🤖 if (temperature > 31) { show “Hot” } else if (temperature > 25) { show “Warm” } else { show “Cool” }
    The temperature is 44 °C. What is shown? (a) Cool (b) Warm (c) Hot
20. 20.True or false: a rubber eraser is a conductor. (a) False (b) True
21. 21.🔁 What does a variable do in a program? (a) measures light (b) blinks an LED (c) joins two wires (d) stores a value
22. 22.Which drawing is the symbol for a wire? (a) a straight line (b) a circle with an X in it (c) a circle with V inside (d) triangle against a bar
23. 23.⚠️ Is it safe to stop if a part gets hot? (a) not safe (b) safe
24. 24.🔍 Which is the odd one out? (a) a tube light (b) a mixer grinder (c) a traffic signal (d) a torch
25. 25.🔗 Series or parallel circuit: “one bulb out, all go out”? (a) parallel (b) series
26. 26.🔦 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) No (b) Yes
27. 27.What does a diode do? (a) stores a little charge (b) beeps for an alarm (c) limits the current (d) lets current go one way
28. 28.Which of these wastes electricity? (a) iron one shirt at a time (b) unplug idle chargers (c) use daylight to read (d) switch off empty rooms
29. 29.Which of these usually has a microcontroller inside? (a) a hand pump (b) a digital alarm clock (c) a candle (d) a wind-up toy
30. 30.Which of these is a risky habit? (a) set up with a parent (b) accept every permission (c) set a strong password (d) share only needed data
31. 31.🔺 In the V-I-R triangle, how do we find V? (a) V = I + R (b) V = I × R (c) V = I ÷ R (d) V = R ÷ I
32. 32.🔺 A 12.5 V supply is joined across a 250 Ω resistor. What current flows (in milliamperes, mA)?
33. 33.🔦 A tester circuit has a new cell, a good bulb and wires with a gap between two clips. We put a rubber eraser across the gap. Does the bulb glow? (a) No (b) Yes
34. 34.🌈 Which colour bands (1st digit, 2nd digit, multiplier) mark a 440 Ω resistor? (a) yellow-yellow-brown (b) yellow-yellow-black (c) yellow-green-brown (d) yellow-yellow-red
35. 35.🤖 if (temperature > 37) { show “Hot” } else if (temperature > 26) { show “Warm” } else { show “Cool” }
    The temperature is 33 °C. What is shown? (a) Hot (b) Warm (c) Cool
36. 36.💡 What happens if an LED is put in backwards? (a) it makes a sound (b) it lights brighter (c) it does not light (d) it changes colour
37. 37.Which of these uses electricity? (a) a power station (b) a cell (c) a bicycle dynamo (d) a computer
38. 38.🧩 Which component stores a little charge? (a) fuse (b) capacitor (c) LDR (d) buzzer
39. 39.🔍 Which is the odd one out? (a) tap unknown app links (b) post your live location (c) set a strong password (d) keep factory passwords
40. 40.⏱️ How many milliseconds is a wait of 1.8 seconds?

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