Electronics Worksheet: Final Test

Electronics lesson 30: Final electronics test · Set 472 · 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 device works on 1.5 V and takes 0.1 A. What is its power (in watts)? =
2. 2.🌐 What does IoT stand for? (a) Internet of Talk (b) Input of Tools (c) Internet of Things (d) Inside of Toys
3. 3.⚡ A 27 W device works on 9 V. What current does it take (in amperes)? =
4. 4.🔁 count = 4
   repeat 9 times { count = count + 7 }
   What is count at the end?
5. 5.Which job needs a sound sensor? (a) stop a robot near walls (b) warn of a gas leak (c) measure classroom noise (d) open blinds at sunrise
6. 6.🧩 Which component is a resistance knob? (a) buzzer (b) potentiometer (c) resistor (d) LDR
7. 7.🔢 To run one loop of a plant-watering program, what comes right after “switch the pump on/off”? (a) wait a few seconds (b) compare with the limit (c) read the soil sensor
8. 8.🔍 Which is the odd one out? (a) a Wi-Fi smart plug (b) a pencil sharpener (c) a plain wall switch (d) a wind-up clock
9. 9.✏️ Why do engineers draw circuits with symbols? (a) quick and clear for all (b) to make it colourful (c) to hide the circuit (d) symbols are heavier
10. 10.⏱️ How many milliseconds are in 1 second? (a) 60 (b) 100 (c) 10 (d) 1000
11. 11.🔍 Which is the odd one out? (a) an electric toy car (b) a buzzer (c) a table fan (d) a ceiling fan
12. 12.💡 An LED is joined to a 5 V battery with no resistor; its long leg goes to the + side and its short leg to the − side. What happens? (a) lights up (b) may burn out (c) does not light
13. 13.📏 How many kilowatts (kW) is 2600 W? =
14. 14.⚡ Which formula gives electric power? (a) P = V × I (b) P = I ÷ V (c) P = V ÷ I (d) P = V + I
15. 15.💡 A battery lights 5 identical bulbs joined in series. One more identical bulb is added in series. How do the bulbs glow now? (a) dimmer (b) the same (c) brighter
16. 16.⚠️ Is it safe to keep drinks far away? (a) safe (b) not safe
17. 17.💡 In a parallel circuit, one bulb breaks. What happens to the others? (a) they explode (b) they keep glowing (c) they all go out (d) they get dimmer
18. 18.🗺️ In an input → process → output plan, is “a button press” the input, the process or the output? (a) output (b) input (c) process
19. 19.🔢 To plan an electronics project, which comes first: “test it and fix it” or “draw the circuit diagram”? (a) draw the circuit diagram (b) test it and fix it
20. 20.🔍 Which is the odd one out? (a) fly a kite near wires (b) touch a fallen wire (c) use small battery cells (d) use a cable with cuts
21. 21.🔍 Which is the odd one out? (a) a rubber eraser (b) a rubber band (c) a cotton thread (d) an iron nail
22. 22.🧮 Adding another resistor in series makes the total resistance … (a) smaller (b) stay the same (c) zero (d) bigger
23. 23.🔘 Switch A is on the main wire next to the cell and the bulb; then the wire splits into two side-by-side paths, one with switch B and one with switch C. A is OFF, B is OFF and C is OFF. Does the bulb glow? (a) No (b) Yes
24. 24.🔦 A circuit has a new cell, a good bulb and a switch that is OFF. All the wires are firmly joined. Does the bulb glow? (a) Yes (b) No
25. 25.🔢 To run one loop of a plant-watering program, which is the FIRST step? (a) wait a few seconds (b) read the soil sensor (c) compare with the limit (d) switch the pump on/off
26. 26.🌈 In the resistor colour code, which number does brown stand for?
27. 27.🗺️ In an input → process → output plan, is “a motion sensor signal” the input, the process or the output? (a) input (b) output (c) process
28. 28.🌈 In the resistor colour code, which number does violet stand for?
29. 29.True or false: the voltmeter is joined in series. (a) True (b) False
30. 30.🔍 Which is the odd one out? (a) turn off unused gadgets (b) cover unused cameras (c) accept every permission (d) set up with a parent
31. 31.🌈 A resistor has the colour bands grey, white, orange. What is its value (in ohms)?
32. 32.🌈 Which band is read first on a resistor? (a) the one nearest an end (b) the gold band (c) the widest gap (d) any band
33. 33.🔘 Which kind of switch springs back when let go? (a) a push button (b) a reed switch (c) a slide switch (d) a tilt switch
34. 34.🧮 Resistors of 330 Ω, 68 Ω, 470 Ω and 330 Ω are joined in series. What is the total resistance (in ohms)?
35. 35.📏 Voltmeter or ammeter: which one measures current? (a) ammeter (b) voltmeter
36. 36.🤖 if (temperature > 35) { show “Hot” } else if (temperature > 22) { show “Warm” } else { show “Cool” }
    The temperature is 26 °C. What is shown? (a) Hot (b) Cool (c) Warm
37. 37.🤖 if (distance < 30) { buzzer beeps } else { buzzer is silent }
    The distance sensor reads 32 cm. What happens? (a) buzzer is silent (b) buzzer beeps
38. 38.💡 A red LED (it uses 2 V) is joined with a 100 Ω resistor to a 4 V supply. What current flows (in mA)?
39. 39.💡 3 identical bulbs are joined in parallel across a 1.5 V battery (ideal wires). How many volts does each bulb get? =
40. 40.✏️ In a circuit diagram, which part is drawn as a circle with A inside? (a) ammeter (b) voltmeter (c) bulb (d) junction

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