Electronics Worksheet: Final Test

Electronics lesson 30: Final electronics test · Set 932 · 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 resistor has the colour bands red, orange, red. What is its value in kilo-ohms (kΩ)? =
2. 2.🔋 5 identical 1.5 V cells are joined in series, but one of them is put in the wrong way round. What is the total voltage now (in volts)? =
3. 3.⚡ A home appliance on the 230 V mains takes 5 A. What is its power (in watts)?
4. 4.Which of these is an input? (a) a servo motor (b) a turning knob (c) a motor (d) a water pump
5. 5.Which of these mainly gives out heat? (a) a street light (b) a school bell (c) an electric iron (d) a table fan
6. 6.✏️ In a circuit diagram, which part is drawn as a circle with A inside? (a) cell (b) switch (c) capacitor (d) ammeter
7. 7.🔐 Is it a good or a risky habit to ignore update messages? (a) good habit (b) risky habit
8. 8.🔺 A 1 V supply is joined across a 100 Ω resistor. What current flows (in milliamperes, mA)?
9. 9.What does a resistor do? (a) turns a fan or wheels (b) makes things spin (c) limits the current (d) is a resistance knob
10. 10.True or false: a fuse blows if current is high. (a) False (b) True
11. 11.💡 An LED (with its resistor) is on pin 7. All pins start LOW. The program runs once:
    set pin 7 LOW
    set pin 8 LOW
    set pin 8 LOW
    Is the LED ON or OFF at the end? (a) ON (b) OFF
12. 12.📶 On a 5 V board, a pin set HIGH gives about … (a) 0 V (b) 230 V (c) 5 V (d) 50 V
13. 13.🔺 An 18 V supply is joined across a 6 Ω resistor. What current flows (in amperes)? =
14. 14.Which of these is measured in ohms (Ω)? (a) the flow of charge (b) the push of a cell (c) resistance (d) energy used each second
15. 15.🔺 A current of 0.1 A flows when 2 V is joined across a resistor. What is its resistance (in ohms)?
16. 16.⚡ A 15 W device works on 5 V. What current does it take (in amperes)? =
17. 17.🔺 A 10 V supply is joined across a 400 Ω resistor. What current flows (in milliamperes, mA)?
18. 18.⚡ A 36 W device works on 24 V. What current does it take (in amperes)? =
19. 19.⚡ Which formula gives electric power? (a) P = I ÷ V (b) P = V ÷ I (c) P = V × I (d) P = V + I
20. 20.🔢 To plan an electronics project, what comes right after “pick a problem to solve”? (a) list inputs and outputs (b) build it with an adult (c) test it and fix it (d) draw the circuit diagram
21. 21.Which job needs a motion sensor? (a) spot someone walking in (b) switch on lamps at dusk (c) start a fan when hot (d) make a parking alarm
22. 22.🔘 A bulb and a cell are joined through 5 switches on 5 side-by-side paths, one switch on each path (parallel). What is the smallest number of switches that must be ON to light the bulb?
23. 23.💡 An LED (with its resistor) is on pin 7. All pins start LOW. The program runs once:
    set pin 8 HIGH
    set pin 8 LOW
    set pin 7 LOW
    Is the LED ON or OFF at the end? (a) OFF (b) ON
24. 24.🧮 Resistors of 22 Ω, 330 Ω and 100 Ω are joined in series. What is the total resistance (in ohms)?
25. 25.True or false: a smart watch has no microcontroller inside. (a) False (b) True
26. 26.⏱️ How many milliseconds are in 1 second? (a) 100 (b) 10 (c) 60 (d) 1000
27. 27.📏 How many milliamperes (mA) is 0.28 A?
28. 28.📶 A pin that reads a push button is set as … (a) an output (b) an input (c) a resistor (d) a battery
29. 29.Which of these mainly makes movement? (a) an electric toy car (b) a torch (c) a traffic signal (d) a room heater
30. 30.🔗 Series or parallel circuit: “many paths for current”? (a) series (b) parallel
31. 31.💡 A battery lights 5 identical bulbs joined in series. One more identical bulb is added in series. How do the bulbs glow now? (a) the same (b) dimmer (c) brighter
32. 32.📏 Voltmeter or ammeter: which one measures voltage? (a) voltmeter (b) ammeter
33. 33.True or false: “one bulb out, all go out” is true of a series circuit. (a) False (b) True
34. 34.🔌 Is a plastic straw a conductor or an insulator? (a) a conductor (b) an insulator
35. 35.True or false: to use LED lamps saves electricity. (a) True (b) False
36. 36.🔘 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 ON, B is OFF and C is ON. Does the bulb glow? (a) No (b) Yes
37. 37.🔺 A 0.4 V supply is joined across a 4 Ω resistor. What current flows (in amperes)? =
38. 38.True or false: a copper wire is an insulator. (a) False (b) True
39. 39.🔦 A circuit has a new cell, a good bulb and a switch that is ON. All the wires are firmly joined. A gap in one wire is bridged by a paper strip. Does the bulb glow? (a) Yes (b) No
40. 40.⏱️ loop forever { LED ON; wait 800 ms; LED OFF; wait 400 ms }
    How many milliseconds does one blink (ON + OFF) take?

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