Electronics Worksheet: Final Test

Electronics lesson 30: Final electronics test · Set 980 · 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.💡 2 identical bulbs are joined in series with a battery and a closed switch on the main wire. Bulb 1 is taken out of its holder. Does bulb 2 glow? (a) No (b) Yes
2. 2.📏 How many ohms make 1 kilo-ohm (kΩ)? (a) 100 (b) 1024 (c) 1000 (d) 10
3. 3.⚡ A solar panel changes which kind of energy into electricity? (a) light energy (b) chemical energy (c) sound energy (d) wind energy
4. 4.🔁 x = 4
   repeat 2 times { x = x × 2 }
   What is x at the end?
5. 5.What does a transistor do? (a) senses how hot it is (b) boosts a small signal (c) makes a beeping sound (d) glows using little power
6. 6.🤖 Does a digital thermometer usually have a microcontroller inside? (a) No (b) Yes
7. 7.✏️ Why do engineers draw circuits with symbols? (a) quick and clear for all (b) to hide the circuit (c) symbols are heavier (d) to make it colourful
8. 8.🔍 Which sensor would you use to water a dry plant? (a) a distance sensor (b) a soil moisture sensor (c) a temperature sensor (d) a gas sensor
9. 9.🔘 When a switch is ON, the circuit is … (a) cut (b) open (c) closed (d) broken
10. 10.True or false: “used in house wiring” is true of a series circuit. (a) False (b) True
11. 11.🤖 if (light < 400 OR motion) { porch lamp ON } else { porch lamp OFF }
    The light reading is 60 and motion is detected (true). What happens? (a) porch lamp OFF (b) porch lamp ON
12. 12.🧩 Which component lets current go one way? (a) LDR (b) diode (c) capacitor (d) fuse
13. 13.Which of these is not an IoT device? (a) a Wi-Fi weather station (b) a Wi-Fi smart plug (c) a wind-up clock (d) a smart energy meter
14. 14.🧮 Resistors of 330 Ω, 68 Ω and 47 Ω are joined in series. What is the total resistance (in ohms)?
15. 15.True or false: a room heater mainly gives out heat. (a) True (b) False
16. 16.⚡ A 0.6 W device works on 6 V. What current does it take (in amperes)? =
17. 17.True or false: a safety pin is a conductor. (a) False (b) True
18. 18.🔘 Which kind of switch springs back when let go? (a) a tilt switch (b) a toggle switch (c) a slide switch (d) a push button
19. 19.🌈 A resistor has the colour bands brown, black, orange. What is its value (in ohms)?
20. 20.True or false: “an alert on the phone” is the output. (a) False (b) True
21. 21.🔢 To run one loop of a plant-watering program, what comes right after “compare with the limit”? (a) read the soil sensor (b) wait a few seconds (c) switch the pump on/off
22. 22.🧮 Three equal 300 Ω resistors are joined in parallel. What is the total resistance (in ohms)?
23. 23.True or false: to build with an adult near is not safe. (a) False (b) True
24. 24.True or false: to use small battery cells is safe. (a) True (b) False
25. 25.🔍 Which is the odd one out? (a) build with an adult near (b) stay away from pylons (c) poke things in a socket (d) use small battery cells
26. 26.⏱️ loop forever { LED ON; wait 50 ms; LED OFF; wait 200 ms }
    How many times does the LED blink in 5 seconds?
27. 27.🔋 How many 1.2 V cells must be joined in series to give 4.8 V?
28. 28.🌐 A weather station sends one reading every 30 seconds. How many readings does it send in 3 minutes?
29. 29.True or false: “each gets the full volts” is true of a series circuit. (a) True (b) False
30. 30.⚠️ Is it safe to keep drinks far away? (a) not safe (b) safe
31. 31.🤖 Does a smart watch usually have a microcontroller inside? (a) No (b) Yes
32. 32.🧮 Two equal 20 Ω resistors are joined in parallel. What is the total resistance (in ohms)?
33. 33.⏱️ loop forever { LED ON; wait 900 ms; LED OFF; wait 900 ms }
    How many milliseconds does one blink (ON + OFF) take?
34. 34.🔌 Is a woollen thread a conductor or an insulator? (a) an insulator (b) a conductor
35. 35.⚡ What does a rice cooker mainly change electricity into? (a) heat (b) sound (c) light (d) movement
36. 36.Which of these is a good habit? (a) set a strong password (b) keep factory passwords (c) share the Wi-Fi key (d) accept every permission
37. 37.💡 On an LED, is the shorter leg the anode (+) or the cathode (−)? (a) cathode (−) (b) anode (+)
38. 38.🤖 “if (A AND B)” is true when … (a) both are false (b) only B is true (c) both A and B are true (d) only A is true
39. 39.🤖 Does a toy robot usually have a microcontroller inside? (a) No (b) Yes
40. 40.Which of these is a conductor? (a) a dry cork (b) an iron nail (c) a woollen thread (d) a ceramic cup

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