Electronics Worksheet: Final Test

Electronics lesson 30: Final electronics test · Set 579 · 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.💡 3 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. Bulb 1 is taken out of its holder. How many bulbs glow?
2. 2.🏠 Which is a smart-home example? (a) a printed map (b) a candle in a jar (c) a hand fan (d) lights on from an app
3. 3.🔌 Why are electric wires covered in plastic? (a) plastic is a conductor (b) to make them heavy (c) plastic makes current (d) plastic is an insulator
4. 4.💡 2 identical bulbs are joined in series with a battery and a closed switch on the main wire. All the bulbs are in place. Does bulb 1 glow? (a) Yes (b) No
5. 5.📏 How many ohms make 1 kilo-ohm (kΩ)? (a) 1024 (b) 10 (c) 1000 (d) 100
6. 6.📶 How many states can a digital pin have? (a) ten (b) one (c) two (d) a thousand
7. 7.🔍 Which sensor would you use to switch on with a clap? (a) a soil moisture sensor (b) a motion sensor (c) a light sensor (d) a sound sensor
8. 8.Which of these uses electricity? (a) a battery (b) a generator (c) a solar panel (d) a television
9. 9.🔍 For a microcontroller, is a sensor an input or an output? (a) an output (b) an input (c) a fuse (d) a power source
10. 10.🔋 A 9 V battery and four 1.5 V cells are joined in series, all facing the same way. What is the total voltage (in volts)? =
11. 11.Which of these is the process? (a) a buzzer beeps (b) count button presses (c) a temperature reading (d) an LED lights up
12. 12.💡 Does it save or waste electricity to use LED lamps? (a) saves electricity (b) wastes electricity
13. 13.🔐 A smart speaker is always listening for its wake word. What is a sensible habit? (a) tell it your passwords (b) let strangers use it (c) put it in the bathroom (d) mute it when not in use
14. 14.Which of these is true of a series circuit? (a) one out, the rest glow (b) bulbs share the voltage (c) used in house wiring (d) many paths for current
15. 15.🔍 A distance sensor sends a sound pulse and hears the echo 10 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
16. 16.🤖 if (light < 200 AND motion) { porch lamp ON } else { porch lamp OFF }
    The light reading is 560 and motion is detected (true). What happens? (a) porch lamp OFF (b) porch lamp ON
17. 17.Which of these is true of a series circuit? (a) one out, the rest glow (b) a break stops every bulb (c) each gets the full volts (d) used in house wiring
18. 18.🔍 Which is the odd one out? (a) a torch (b) a street light (c) a traffic signal (d) a water heater
19. 19.💡 2 identical bulbs are joined in series with a 4 V battery (ideal wires). How many volts does each bulb get? =
20. 20.🔐 Is it a good or a risky habit to share only needed data? (a) risky habit (b) good habit
21. 21.⚡ A 0.3 W device works on 1.5 V. What current does it take (in amperes)? =
22. 22.🔦 A circuit has a used-up (dead) cell, a good bulb and a switch that is ON. All the wires are firmly joined. A gap in one wire is bridged by a wooden stick. Does the bulb glow? (a) No (b) Yes
23. 23.⚡ A device works on 9 V and takes 0.1 A. What is its power (in watts)? =
24. 24.🔺 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
25. 25.🔍 Which is the odd one out? (a) a loudspeaker (b) a tube light (c) a siren (d) a doorbell
26. 26.💡 4 identical bulbs are in parallel and each bulb has its own switch on its path. 2 of the switches are OFF and the rest are ON. How many bulbs glow?
27. 27.🔍 Which is the odd one out? (a) build with an adult near (b) dry your hands first (c) use a cable with cuts (d) take cells out after use
28. 28.🧮 Adding another resistor in series makes the total resistance … (a) stay the same (b) bigger (c) smaller (d) zero
29. 29.True or false: on an LED, the leg by the flat edge is the anode (+). (a) True (b) False
30. 30.🔋 8 identical 1.5 V cells are joined in series, but one of them is put in the wrong way round. What is the total voltage now (in volts)? =
31. 31.🔍 Which is the odd one out? (a) stop if a part gets hot (b) fly a kite near wires (c) use small battery cells (d) keep drinks far away
32. 32.🧮 A 22 V battery is joined to 12 Ω and 10 Ω resistors in series. What current flows (in amperes)? =
33. 33.🔍 Which is the odd one out? (a) a paper strip (b) a plastic straw (c) a copper wire (d) a rubber eraser
34. 34.💡 Old festival light strings went fully dark when one bulb failed. How were they joined? (a) in series (b) by Wi-Fi (c) in parallel (d) not joined
35. 35.🔗 Series or parallel circuit: “one out, the rest glow”? (a) parallel (b) series
36. 36.🧮 Two equal 200 Ω resistors are joined in parallel. What is the total resistance (in ohms)?
37. 37.🤖 if (temperature > 32) { show “Hot” } else if (temperature > 23) { show “Warm” } else { show “Cool” }
    The temperature is 12 °C. What is shown? (a) Cool (b) Warm (c) Hot
38. 38.🔺 In the V-I-R triangle, how do we find V? (a) V = I + R (b) V = R ÷ I (c) V = I ÷ R (d) V = I × R
39. 39.Which of these is safe? (a) take cells out after use (b) fly a kite near wires (c) use a cable with cuts (d) use mains for a project
40. 40.🌐 Is a plain table fan an IoT device? (a) an IoT device (b) not an IoT device

Free electronics lessons, practice and worksheets at talentjr.in/electronics-for-kids