Electronics Worksheet: Final Test

Electronics lesson 30: Final electronics test · Set 554 · 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.🔍 Which is the odd one out? (a) a toaster (b) a doorbell (c) a water heater (d) an electric kettle
2. 2.🔁 What does a variable do in a program? (a) joins two wires (b) blinks an LED (c) stores a value (d) measures light
3. 3.📏 How many kilowatts (kW) is 700 W? =
4. 4.🏠 Which is a smart-home example? (a) a candle in a jar (b) a hand fan (c) lights on from an app (d) a printed map
5. 5.What does the sensor do? (a) measures the real world (b) shows data to you (c) carries the data (d) stores data online
6. 6.🔐 Is it a good or a risky habit to turn off unused gadgets? (a) risky habit (b) good habit
7. 7.🔘 Two switches are in series. When does the bulb glow? (a) never (b) when both are ON (c) when either is ON (d) when both are OFF
8. 8.Which of these uses electricity? (a) a cell (b) a refrigerator (c) a generator (d) a battery
9. 9.🤖 if (temperature > 35) { show “Hot” } else if (temperature > 24) { show “Warm” } else { show “Cool” }
   The temperature is 18 °C. What is shown? (a) Cool (b) Warm (c) Hot
10. 10.✏️ In a circuit diagram, which part is drawn as a line lifted at a gap? (a) bulb (b) LED (c) junction (d) switch
11. 11.🧮 Adding another resistor in series makes the total resistance … (a) smaller (b) stay the same (c) bigger (d) zero
12. 12.🔺 A current of 25 mA flows through a 400 Ω resistor. What is the voltage across it (in volts)? =
13. 13.⏱️ loop forever { LED ON; wait 600 ms; LED OFF; wait 450 ms }
    How many milliseconds does one blink (ON + OFF) take?
14. 14.True or false: “one bulb out, all go out” is true of a parallel circuit. (a) True (b) False
15. 15.🔗 Series or parallel circuit: “own switch for each bulb”? (a) series (b) parallel
16. 16.🔺 A current of 20 mA flows through a 100 Ω resistor. What is the voltage across it (in volts)? =
17. 17.Which of these gives us electricity? (a) a mobile phone (b) a water pump (c) a television (d) a cell
18. 18.Which of these is measured in ohms (Ω)? (a) the push of a cell (b) power (c) energy used each second (d) how much a part resists
19. 19.📏 Voltmeter or ammeter: which one is joined in series? (a) voltmeter (b) ammeter
20. 20.Which drawing is the symbol for a junction? (a) a circle with V inside (b) a small empty box (c) a circle with a cross (d) a dot where wires meet
21. 21.🧾 A family uses 90 units of electricity in a month and each unit costs ₹5. What is the bill (in ₹)?
22. 22.📏 Voltmeter or ammeter: which one measures voltage? (a) voltmeter (b) ammeter
23. 23.🌐 Each reading a sensor sends is 25 bytes. How many bytes do 170 readings take?
24. 24.True or false: to dry your hands first is not safe. (a) True (b) False
25. 25.🔺 A current of 10 mA flows through a 220 Ω resistor. What is the voltage across it (in volts)? =
26. 26.🔌 Is a cotton thread a conductor or an insulator? (a) an insulator (b) a conductor
27. 27.🔁 count = 8
    repeat 6 times { count = count + 3 }
    What is count at the end?
28. 28.💡 4 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 3 are taken out of their holders. How many bulbs glow?
29. 29.🔍 Which is the odd one out? (a) touch a switch when wet (b) fly kites in open fields (c) keep drinks far away (d) take cells out after use
30. 30.True or false: to reuse one password is a risky habit. (a) False (b) True
31. 31.🌐 In an IoT system, which part stores data online? (a) sensor (b) Wi-Fi (c) microcontroller (d) cloud server
32. 32.🧾 A 1000 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
33. 33.🔺 A current of 20 mA flows through a 330 Ω resistor. What is the voltage across it (in volts)? =
34. 34.🔍 Which is the odd one out? (a) a traffic signal (b) a torch (c) a street light (d) a siren
35. 35.True or false: a plain wall switch usually has a microcontroller inside. (a) False (b) True
36. 36.📏 How many watts (W) is 2.7 kW?
37. 37.🔁 What must there be for a current to flow? (a) a broken path (b) a plastic gap (c) one loose end (d) a complete loop
38. 38.Which job needs a buzzer? (a) turn to an exact angle (b) beep an alarm (c) move water to plants (d) open a gate to 90°
39. 39.🌐 Is an app-controlled bulb an IoT device? (a) an IoT device (b) not an IoT device
40. 40.True or false: a thermistor smooths a wobbly supply. (a) False (b) True

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