Electronics Worksheet: Final Test

Electronics lesson 30: Final electronics test · Set 237 · 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.🧾 One “unit” on an electricity bill is … (a) 1 watt (b) 1 kilowatt-hour (kWh) (c) 1 volt (d) 1 ampere
2. 2.✏️ In a cell symbol, which line is the + terminal? (a) the shorter line (b) the longer line (c) both lines (d) neither line
3. 3.🧭 Which part of a microcontroller board brings power and code? (a) the reset button (b) the main chip (c) the pins (d) the USB port
4. 4.⚡ What does a buzzer mainly change electricity into? (a) movement (b) sound (c) heat (d) light
5. 5.🔦 A circuit has a new cell, a good bulb and a switch that is ON. All the wires are firmly joined. Does the bulb glow? (a) No (b) Yes
6. 6.Which of these is not an IoT device? (a) a Wi-Fi smart plug (b) a smart energy meter (c) a paper calendar (d) a Wi-Fi doorbell camera
7. 7.True or false: on an LED, the round-side leg is the cathode (−). (a) True (b) False
8. 8.🔗 Series or parallel circuit: “one out, the rest glow”? (a) parallel (b) series
9. 9.Which of these wastes electricity? (a) switch off empty rooms (b) close the fridge quickly (c) use old filament bulbs (d) set the AC to 24 °C
10. 10.True or false: if all wires are joined, the circuit is open and no current flows. (a) True (b) False
11. 11.💡 3 identical bulbs are joined in series with a 7.5 V battery (ideal wires). How many volts does each bulb get? =
12. 12.🌐 In an IoT system, which part reads values, decides? (a) microcontroller (b) sensor (c) actuator (d) cloud server
13. 13.⚡ A device works on 6 V and takes 1.5 A. What is its power (in watts)? =
14. 14.🧮 A 150 Ω resistor is joined in series with two equal 20 Ω resistors that are in parallel with each other. What is the total resistance (in ohms)?
15. 15.🔦 A circuit has a used-up (dead) cell, a good bulb and a switch that is ON. All the wires are firmly joined. Does the bulb glow? (a) No (b) Yes
16. 16.🔍 Which is the odd one out? (a) a sound sensor (b) a speaker (c) a turning knob (d) a push button
17. 17.True or false: voltage is measured in volts (V). (a) False (b) True
18. 18.🧾 A family uses 90 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
19. 19.🔢 To plan an electronics project, which is the FIRST step? (a) draw the circuit diagram (b) list inputs and outputs (c) pick a problem to solve (d) test it and fix it
20. 20.True or false: a graphite rod is a conductor. (a) False (b) True
21. 21.⚡ A solar panel changes which kind of energy into electricity? (a) sound energy (b) wind energy (c) chemical energy (d) light energy
22. 22.Which of these mainly makes sound? (a) an electric iron (b) a ceiling fan (c) a loudspeaker (d) a rice cooker
23. 23.Which of these is a risky habit? (a) accept every permission (b) read app permissions (c) change default passwords (d) cover unused cameras
24. 24.⏱️ A program says “wait 3250 ms”. How many seconds is that? =
25. 25.🔺 A current of 1.5 A flows through a 5 Ω resistor. What is the voltage across it (in volts)? =
26. 26.🔢 To run one loop of a plant-watering program, what comes right after “read the soil sensor”? (a) compare with the limit (b) wait a few seconds (c) switch the pump on/off
27. 27.🔍 Which sensor would you use to stop a robot near walls? (a) a light sensor (b) a rain sensor (c) a distance sensor (d) a sound sensor
28. 28.📶 A pin that reads a push button is set as … (a) an input (b) an output (c) a resistor (d) a battery
29. 29.🔺 In the V-I-R triangle, how do we find R? (a) R = V × I (b) R = V ÷ I (c) R = I ÷ V (d) R = V + I
30. 30.🔍 Which is the odd one out? (a) an exhaust fan (b) an electric toy car (c) a traffic signal (d) a ceiling fan
31. 31.⚡ Which formula gives electric power? (a) P = V ÷ I (b) P = I ÷ V (c) P = V × I (d) P = V + I
32. 32.Which of these is not an IoT device? (a) a fitness band with app (b) a plain wall switch (c) a Wi-Fi smart plug (d) a Wi-Fi doorbell camera
33. 33.Which of these is measured in amperes (A)? (a) power (b) how much a part resists (c) voltage (d) current
34. 34.🔁 count = 1
    while (count < 13) { count = count + 4 }
    How many times does the loop run?
35. 35.🔁 x = 2
    repeat 3 times { x = x × 2 }
    What is x at the end?
36. 36.Which of these gives us electricity? (a) a television (b) a refrigerator (c) a water pump (d) a solar panel
37. 37.🔘 A cell, a bulb and switches A and B are joined one after another in a single loop (series). A is ON and B is OFF. Does the bulb glow? (a) Yes (b) No
38. 38.🔌 Why are electric wires covered in plastic? (a) to make them heavy (b) plastic is an insulator (c) plastic makes current (d) plastic is a conductor
39. 39.⚡ A home appliance on the 230 V mains takes 8 A. What is its power (in watts)?
40. 40.True or false: “bulbs share the voltage” is true of a parallel circuit. (a) False (b) True

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