Electronics Worksheet: Final Test

Electronics lesson 30: Final electronics test · Set 848 · 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 of these is a risky habit? (a) share only needed data (b) install software updates (c) accept every permission (d) log out of shared phones
2. 2.🤖 Does a candle usually have a microcontroller inside? (a) Yes (b) No
3. 3.🤖 if (temperature > 32) { show “Hot” } else if (temperature > 24) { show “Warm” } else { show “Cool” }
   The temperature is 32 °C. What is shown? (a) Warm (b) Cool (c) Hot
4. 4.Which of these is an output? (a) an LED (b) a temperature sensor (c) a keypad (d) a push button
5. 5.Which of these is true of a series circuit? (a) each gets the full volts (b) one bulb out, all go out (c) one out, the rest glow (d) used in house wiring
6. 6.💡 5 identical bulbs are joined in parallel across a 12 V battery (ideal wires). How many volts does each bulb get? =
7. 7.True or false: a reed switch closes when tipped over. (a) True (b) False
8. 8.🗺️ In an input → process → output plan, is “decide if soil is dry” the input, the process or the output? (a) output (b) process (c) input
9. 9.🔁 Is the circuit closed or open if a cell is taken out? (a) closed (b) open
10. 10.Which job is done by the pins? (a) runs the program (b) restarts the program (c) connect sensors and LEDs (d) brings power and code
11. 11.Which of these means the circuit is closed? (a) all wires are joined (b) a cell is taken out (c) the switch is OFF (d) a wire is cut
12. 12.📏 How many ohms make 1 kilo-ohm (kΩ)? (a) 100 (b) 10 (c) 1000 (d) 1024
13. 13.🔘 Which kind of switch stays where you flip it? (a) a toggle switch (b) a tilt switch (c) a push button (d) a reed switch
14. 14.🔁 What do we call a circuit with a break in it? (a) a series circuit (b) a full circuit (c) a closed circuit (d) an open circuit
15. 15.Which of these is the process? (a) an alert on the phone (b) a light level reading (c) an LED lights up (d) decide if soil is dry
16. 16.🧮 Two equal 470 Ω resistors are joined in parallel. What is the total resistance (in ohms)?
17. 17.🌈 Which band is read first on a resistor? (a) the widest gap (b) the gold band (c) the one nearest an end (d) any band
18. 18.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 6 hours. How many watt-hours (Wh) are saved?
19. 19.⚡ A device works on 24 V and takes 0.1 A. What is its power (in watts)? =
20. 20.⚙️ What is an actuator? (a) a sensor (b) a battery (c) an output that acts (d) a program
21. 21.⏱️ repeat 5 times { buzzer ON; wait 400 ms; buzzer OFF; wait 600 ms }
    How many milliseconds does this take in all?
22. 22.True or false: to stop a robot near walls, use a soil moisture sensor. (a) False (b) True
23. 23.🔺 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
24. 24.🔦 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
25. 25.🌐 In an IoT system, which part stores data online? (a) Wi-Fi (b) cloud server (c) phone app (d) microcontroller
26. 26.True or false: a street light mainly gives out light. (a) True (b) False
27. 27.True or false: “many paths for current” is true of a series circuit. (a) False (b) True
28. 28.🔁 x = 2
    repeat 1 time { x = x × 2 }
    What is x at the end?
29. 29.🔁 Is the circuit closed or open if the bulb is unscrewed? (a) closed (b) open
30. 30.🔗 Series or parallel circuit: “a single current path”? (a) parallel (b) series
31. 31.🌈 Which colour bands (1st digit, 2nd digit, multiplier) mark a 5200 Ω resistor? (a) green-red-red (b) green-red-brown (c) red-green-red (d) green-red-orange
32. 32.🔍 Which sensor would you use to spot someone walking in? (a) a rain sensor (b) a temperature sensor (c) a motion sensor (d) a distance sensor
33. 33.⚙️ Which actuator would you use to move water to plants? (a) a display (b) a motor (c) an LED (d) a pump
34. 34.🔋 How many 1.5 V cells must be joined in series to give 6 V?
35. 35.⚡ A device works on 3 V and takes 1.5 A. What is its power (in watts)? =
36. 36.True or false: “bulbs share the voltage” is true of a series circuit. (a) True (b) False
37. 37.True or false: to water a dry plant, use a gas sensor. (a) True (b) False
38. 38.🤖 Microcontroller or laptop: which one runs one small program? (a) laptop (b) microcontroller
39. 39.💡 2 identical bulbs are joined in series with a battery and a closed switch on the main wire. Bulb 2 is taken out of its holder. How many bulbs glow?
40. 40.💡 What does LED stand for? (a) light-emitting diode (b) low energy device (c) light energy dial (d) large electric dial

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