Electronics Worksheet: Final Test

Electronics lesson 30: Final electronics test · Set 994 · 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 drawing is the symbol for a wire? (a) two or more cell symbols (b) a line lifted at a gap (c) many long-short pairs (d) a straight line
2. 2.🤖 In “if (temp > 30)”, what runs when temp is exactly 30? (a) the else part (b) the if part (c) neither part (d) both parts
3. 3.🔌 Is a dry cork a conductor or an insulator? (a) a conductor (b) an insulator
4. 4.🔺 A current of 0.1 A flows when 1.5 V is joined across a resistor. What is its resistance (in ohms)?
5. 5.⚡ Which formula gives electric power? (a) P = V ÷ I (b) P = I ÷ V (c) P = V + I (d) P = V × I
6. 6.🔘 A cell and a bulb are joined to 4 side-by-side paths with one switch on each path — A, B, C and D (parallel). A is ON, B is OFF, C is ON and D is OFF. Does the bulb glow? (a) No (b) Yes
7. 7.🔍 For a microcontroller, is a sensor an input or an output? (a) an output (b) a power source (c) an input (d) a fuse
8. 8.🔋 5 identical 1.5 V cells are joined side by side in parallel (all + ends together, all − ends together). What is the voltage across them (in volts)? =
9. 9.Which of these mainly makes movement? (a) an electric drill (b) a school bell (c) a loudspeaker (d) a traffic signal
10. 10.⏱️ loop forever { LED ON; wait 50 ms; LED OFF; wait 1950 ms }
    How many times does the LED blink in 18 seconds?
11. 11.💡 A red LED uses 2 V and should get 25 mA. It runs from a 9 V supply. What resistor (in ohms) is needed in series?
12. 12.🧩 Which component is a resistance knob? (a) resistor (b) LED (c) diode (d) potentiometer
13. 13.🔺 A current of 0.2 A flows when 3 V is joined across a resistor. What is its resistance (in ohms)?
14. 14.🔍 Which is the odd one out? (a) a ceiling fan (b) an electric toy car (c) an electric kettle (d) an exhaust fan
15. 15.📏 Which unit measures the push of a cell? (a) ampere (A) (b) volt (V) (c) ohm (Ω) (d) watt (W)
16. 16.🔗 Series or parallel circuit: “a single current path”? (a) parallel (b) series
17. 17.🧩 Which component makes a beeping sound? (a) resistor (b) transistor (c) buzzer (d) LED
18. 18.🤖 if (temperature > 31) { show “Hot” } else if (temperature > 26) { show “Warm” } else { show “Cool” }
    The temperature is 42 °C. What is shown? (a) Warm (b) Cool (c) Hot
19. 19.⏱️ How many milliseconds is a wait of 3.5 seconds?
20. 20.🔺 A current of 2 A flows when 12 V is joined across a resistor. What is its resistance (in ohms)?
21. 21.🔺 A current of 25 mA flows through a 330 Ω resistor. What is the voltage across it (in volts)? =
22. 22.Which drawing is the symbol for a resistor? (a) a small empty box (b) two equal parallel lines (c) a circle with V inside (d) a dot where wires meet
23. 23.🧮 Resistors of 330 Ω, 220 Ω, 470 Ω and 220 Ω are joined in series. What is the total resistance (in ohms)?
24. 24.🧮 Two equal 20 Ω resistors are joined in parallel. What is the total resistance (in ohms)?
25. 25.✏️ In a circuit diagram, which part is drawn as a circle with A inside? (a) LED (b) motor (c) ammeter (d) bulb
26. 26.💡 6 identical bulbs are in parallel and each one takes 1.5 A. What total current (in amperes) comes from the battery? =
27. 27.🔁 total = 0
    for i = 1 to 5 { total = total + i }
    What is total at the end?
28. 28.💡 5 identical bulbs are joined in parallel across a 6 V battery (ideal wires). How many volts does each bulb get? =
29. 29.⚡ Which tiny particles drift along a metal wire to carry the current? (a) electrons (b) dust particles (c) photons (d) water drops
30. 30.⚡ A 4.5 W device works on 1.5 V. What current does it take (in amperes)? =
31. 31.Which of these is an input? (a) a buzzer (b) a motor (c) a keypad (d) an LED
32. 32.True or false: “own switch for each bulb” is true of a parallel circuit. (a) False (b) True
33. 33.🔋 A 9 V battery and one 1.5 V cell are joined in series, all facing the same way. What is the total voltage (in volts)? =
34. 34.Which of these is not safe? (a) build with an adult near (b) keep drinks far away (c) stop if a part gets hot (d) touch a fallen wire
35. 35.True or false: “the fan starts” is the input. (a) False (b) True
36. 36.True or false: a slide switch flips up or down. (a) True (b) False
37. 37.🤖 “if (A AND B)” is true when … (a) only B is true (b) only A is true (c) both are false (d) both A and B are true
38. 38.🔍 Which is the odd one out? (a) open a phone charger (b) build with an adult near (c) dry your hands first (d) use small battery cells
39. 39.🤖 Microcontroller or laptop: which one has no screen of its own? (a) microcontroller (b) laptop
40. 40.🧮 A 47 Ω resistor is joined in series with two equal 1000 Ω resistors that are in parallel with each other. What is the total resistance (in ohms)?

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