Electronics Worksheet: Final Test

Electronics lesson 30: Final electronics test · Set 468 · 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.True or false: a microcontroller runs one small program. (a) True (b) False
2. 2.💡 On an LED, is the leg by the flat edge the anode (+) or the cathode (−)? (a) anode (+) (b) cathode (−)
3. 3.True or false: resistance is measured in volts (V). (a) True (b) False
4. 4.True or false: “one bulb out, all go out” is true of a series circuit. (a) True (b) False
5. 5.Which job is done by the reset button? (a) brings power and code (b) restarts the program (c) keeps the voltage steady (d) shows the board is on
6. 6.Which of these mainly gives out heat? (a) a tube light (b) a mixer grinder (c) a traffic signal (d) a rice cooker
7. 7.🔁 Is the circuit closed or open if the switch is OFF? (a) closed (b) open
8. 8.🔋 How many volts does one ordinary torch cell give? (a) 230 V (b) 15 V (c) 0.5 V (d) 1.5 V
9. 9.✏️ In a circuit diagram, which part is drawn as a plain rectangle? (a) voltmeter (b) resistor (c) switch (d) wire
10. 10.📏 How many amperes (A) is 320 mA? =
11. 11.🔁 count = 9
    repeat 2 times { count = count + 7 }
    What is count at the end?
12. 12.🔋 Does a washing machine give electricity or use electricity? (a) gives electricity (b) uses electricity
13. 13.🔺 A 15 V supply is joined across a 300 Ω resistor. What current flows (in milliamperes, mA)?
14. 14.🤖 if (light < 400) { lamp ON } else { lamp OFF }
    The light sensor reads 337. What happens? (a) lamp OFF (b) lamp ON
15. 15.🔺 A current of 2 A flows through a 12 Ω resistor. What is the voltage across it (in volts)? =
16. 16.🔋 On a cell, does “the shorter symbol line” mean the + end or the − end? (a) + (positive) (b) − (negative)
17. 17.True or false: “own switch for each bulb” is true of a series circuit. (a) False (b) True
18. 18.🧮 A 10 V battery is joined to 8 Ω and 12 Ω resistors in series. What current flows (in amperes)? =
19. 19.⚡ A device works on 5 V and takes 3 A. What is its power (in watts)? =
20. 20.🔗 Series or parallel circuit: “one bulb out, all go out”? (a) parallel (b) series
21. 21.True or false: to use small battery cells is safe. (a) True (b) False
22. 22.🔘 Which kind of switch works only while pressed? (a) a push button (b) a reed switch (c) a tilt switch (d) a toggle switch
23. 23.🔁 total = 0
    for i = 1 to 5 { total = total + i }
    What is total at the end?
24. 24.Which of these is measured in ohms (Ω)? (a) the flow of charge (b) the push of a cell (c) energy used each second (d) how much a part resists
25. 25.Which of these is the output? (a) check if temp > 30 (b) a light level reading (c) decide if soil is dry (d) the pump turns on
26. 26.What does the actuator do? (a) acts on a command (b) stores data online (c) shows data to you (d) carries the data
27. 27.Which of these saves electricity? (a) iron one shirt at a time (b) leave fridge door open (c) unplug idle chargers (d) use old filament bulbs
28. 28.🌐 Is a pencil sharpener an IoT device? (a) an IoT device (b) not an IoT device
29. 29.💡 In a series circuit, how many paths does the current have? (a) one for each bulb (b) one (c) two (d) none
30. 30.🤖 “if (A AND B)” is true when … (a) both are false (b) only A is true (c) both A and B are true (d) only B is true
31. 31.🔐 Is it a good or a risky habit to keep factory passwords? (a) risky habit (b) good habit
32. 32.🔁 Is the circuit closed or open if a cell is taken out? (a) open (b) closed
33. 33.⚡ What does an electric drill mainly change electricity into? (a) heat (b) light (c) movement (d) sound
34. 34.🔐 Is it a good or a risky habit to ignore update messages? (a) good habit (b) risky habit
35. 35.🔁 total = 0
    for i = 1 to 8 { total = total + i }
    What is total at the end?
36. 36.🔺 The voltage stays the same and the resistance gets bigger. The current … (a) gets smaller (b) stays the same (c) gets bigger (d) becomes zero
37. 37.🔁 count = 9
    repeat 3 times { count = count + 9 }
    What is count at the end?
38. 38.True or false: a slide switch slides side to side. (a) True (b) False
39. 39.💡 An LED (with its resistor) is on pin 7. All pins start LOW. The program runs once:
    set pin 7 LOW
    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
40. 40.⚡ A home appliance on the 230 V mains takes 10 A. What is its power (in watts)?

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