Electronics Worksheet: Final Test

Electronics lesson 30: Final electronics test · Set 929 · 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.🤖 In “if (temp > 30)”, what runs when temp is exactly 30? (a) the else part (b) the if part (c) both parts (d) neither part
2. 2.🔋 Does a generator give electricity or use electricity? (a) uses electricity (b) gives electricity
3. 3.Which drawing is the symbol for a motor? (a) a circle with M inside (b) triangle, bar and arrows (c) two or more cell symbols (d) a straight line
4. 4.🔌 Is a temperature sensor an input or an output for a microcontroller? (a) input (b) output
5. 5.🔍 Which is the odd one out? (a) open a phone charger (b) throw cells in a fire (c) use a cable with cuts (d) build with an adult near
6. 6.🌐 In an IoT system, which part carries the data? (a) microcontroller (b) actuator (c) Wi-Fi (d) cloud server
7. 7.⏱️ repeat 10 times { buzzer ON; wait 100 ms; buzzer OFF; wait 400 ms }
   How many milliseconds does this take in all?
8. 8.🧮 Two resistors in parallel give a total that is … (a) their sum (b) more than either one (c) always zero (d) less than either one
9. 9.✏️ In a circuit diagram, which part is drawn as a plain rectangle? (a) ammeter (b) resistor (c) voltmeter (d) cell
10. 10.🧮 A 3 V battery is joined to 6 Ω and 6 Ω resistors in series. What current flows (in amperes)? =
11. 11.Which of these uses electricity? (a) a bicycle dynamo (b) a solar panel (c) an air conditioner (d) a generator
12. 12.⚡ A 5 W device works on 5 V. What current does it take (in amperes)? =
13. 13.🤖 if (light < 300) { lamp ON } else { lamp OFF }
    The light sensor reads 315. What happens? (a) lamp ON (b) lamp OFF
14. 14.✏️ In a cell symbol, which line is the + terminal? (a) neither line (b) both lines (c) the shorter line (d) the longer line
15. 15.Which of these is an IoT device? (a) a Wi-Fi doorbell camera (b) a wind-up clock (c) a plain table fan (d) a plain wall switch
16. 16.⚠️ Is it safe to poke things in a socket? (a) not safe (b) safe
17. 17.Which of these is not safe? (a) keep drinks far away (b) stay away from pylons (c) build with an adult near (d) use mains for a project
18. 18.⚙️ Which actuator would you use to turn to an exact angle? (a) a display (b) a buzzer (c) an LED (d) a servo motor
19. 19.💡 A battery lights 3 identical bulbs joined in series. One more identical bulb is added in series. How do the bulbs glow now? (a) dimmer (b) brighter (c) the same
20. 20.🧮 A 1.4 V battery is joined to 6 Ω and 8 Ω resistors in series. What current flows (in amperes)? =
21. 21.🔁 What does a variable do in a program? (a) joins two wires (b) stores a value (c) measures light (d) blinks an LED
22. 22.🔺 An 8.8 V supply is joined across a 220 Ω resistor. What current flows (in milliamperes, mA)?
23. 23.True or false: to touch a fallen wire is safe. (a) False (b) True
24. 24.🌈 A resistor has the colour bands red, orange, brown. What is its value (in ohms)?
25. 25.🧮 Three equal 60 Ω resistors are joined in parallel. What is the total resistance (in ohms)?
26. 26.💡 A red LED (it uses 2 V) is joined with a 150 Ω resistor to a 5 V supply. What current flows (in mA)?
27. 27.True or false: to build with an adult near is safe. (a) True (b) False
28. 28.🌈 A resistor has the colour bands orange, red, red. What is its value in kilo-ohms (kΩ)? =
29. 29.🔺 A 2.5 V supply is joined across a 10 Ω resistor. What current flows (in amperes)? =
30. 30.True or false: a reed switch closes near a magnet. (a) True (b) False
31. 31.🧮 Two equal 330 Ω resistors are joined in parallel. What is the total resistance (in ohms)?
32. 32.🧮 Resistors of 330 Ω, 10 Ω, 10 Ω and 10 Ω are joined in series. What is the total resistance (in ohms)?
33. 33.🔗 Series or parallel circuit: “many paths for current”? (a) parallel (b) series
34. 34.🔍 Which is the odd one out? (a) a sound sensor (b) a turning knob (c) a light sensor (d) a water pump
35. 35.🔺 A 6 V supply is joined across a 12 Ω resistor. What current flows (in amperes)? =
36. 36.📶 A pin that reads a push button is set as … (a) an output (b) a battery (c) a resistor (d) an input
37. 37.🌈 Which colour bands (1st digit, 2nd digit, multiplier) mark a 6000 Ω resistor? (a) blue-black-orange (b) blue-black-brown (c) blue-black-red (d) violet-blue-red
38. 38.🔍 Which sensor would you use to spot someone walking in? (a) a light sensor (b) a sound sensor (c) a motion sensor (d) a temperature sensor
39. 39.True or false: if a wire has come loose, the circuit is closed and current flows. (a) False (b) True
40. 40.🌈 Which band is read first on a resistor? (a) any band (b) the one nearest an end (c) the gold band (d) the widest gap

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