Electronics Worksheet: Final Test

Electronics lesson 30: Final electronics test · Set 104 · 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.🔁 count = 0
   repeat 6 times { count = count + 3 }
   What is count at the end?
2. 2.✏️ In a circuit diagram, wires are usually drawn as … (a) little stars (b) straight lines (c) wavy lines (d) dotted circles
3. 3.🤖 Microcontroller or laptop: which one has no screen of its own? (a) microcontroller (b) laptop
4. 4.🔗 Series or parallel circuit: “many paths for current”? (a) series (b) parallel
5. 5.🔋 Identical cells side by side (in parallel) give … (a) double the voltage (b) half the voltage (c) no voltage (d) the same voltage
6. 6.🔗 Series or parallel circuit: “used in house wiring”? (a) parallel (b) series
7. 7.Which of these is a conductor? (a) a woollen thread (b) a safety pin (c) a plastic straw (d) a ceramic cup
8. 8.True or false: a buzzer mainly makes sound. (a) False (b) True
9. 9.✏️ In a cell symbol, which line is the + terminal? (a) neither line (b) the shorter line (c) the longer line (d) both lines
10. 10.🧮 A 150 Ω resistor is joined in series with two equal 10 Ω resistors that are in parallel with each other. What is the total resistance (in ohms)?
11. 11.⚠️ Is it safe to use mains for a project? (a) not safe (b) safe
12. 12.True or false: to share camera links is a risky habit. (a) True (b) False
13. 13.🔘 When a switch is ON, the circuit is … (a) cut (b) broken (c) open (d) closed
14. 14.Which drawing is the symbol for a cell? (a) a straight line (b) a plain rectangle (c) one tall, one short bar (d) a dot where wires meet
15. 15.Which of these is a risky habit? (a) log out of shared phones (b) install software updates (c) accept every permission (d) change default passwords
16. 16.🔍 Which sensor would you use to close a window in rain? (a) a sound sensor (b) a motion sensor (c) a temperature sensor (d) a rain sensor
17. 17.🌈 A resistor has the colour bands white, grey, red. What is its value in kilo-ohms (kΩ)? =
18. 18.💡 Does it save or waste electricity to use daylight to read? (a) saves electricity (b) wastes electricity
19. 19.⚡ A device works on 3 V and takes 0.25 A. What is its power (in watts)? =
20. 20.🧮 Two resistors in parallel give a total that is … (a) less than either one (b) their sum (c) more than either one (d) always zero
21. 21.True or false: voltage is measured in volts (V). (a) False (b) True
22. 22.🔋 8 identical 1.5 V cells are joined in series (+ of one cell to − of the next). What is the total voltage (in volts)? =
23. 23.📏 Voltmeter or ammeter: which one measures current? (a) voltmeter (b) ammeter
24. 24.🔍 Which is the odd one out? (a) an electric toy car (b) a table fan (c) an exhaust fan (d) a torch
25. 25.Which of these is not safe? (a) use small battery cells (b) stay away from pylons (c) take cells out after use (d) poke things in a socket
26. 26.💡 An LED is joined to a 3 V battery through a 220 Ω resistor; its long leg goes to the − side and its short leg to the + side. What happens? (a) lights up (b) may burn out (c) does not light
27. 27.🔁 total = 0
    for i = 1 to 11 { total = total + i }
    What is total at the end?
28. 28.🧩 Which part changes electrical energy into sound? (a) a resistor (b) a diode (c) a capacitor (d) a buzzer
29. 29.🔋 A 6 V battery and four 1.5 V cells are joined in series, all facing the same way. What is the total voltage (in volts)? =
30. 30.🔐 Why install updates on IoT devices? (a) they fix security holes (b) they delete the Wi-Fi (c) they change the colour (d) they make it heavier
31. 31.Which job is done by the pins? (a) keeps the voltage steady (b) connect sensors and LEDs (c) runs the program (d) brings power and code
32. 32.🧮 A 50 Ω resistor is joined in series with two equal 20 Ω resistors that are in parallel with each other. What is the total resistance (in ohms)?
33. 33.💡 An LED is joined to a 5 V battery through a 330 Ω resistor; the leg next to the flat edge of its rim goes to the − side. What happens? (a) may burn out (b) lights up (c) does not light
34. 34.🔍 Which is the odd one out? (a) set a strong password (b) read app permissions (c) share camera links (d) install software updates
35. 35.⚡ What does an exhaust fan mainly change electricity into? (a) heat (b) sound (c) movement (d) light
36. 36.True or false: the ammeter measures voltage. (a) False (b) True
37. 37.🔋 A 3 V battery and one 1.5 V cell are joined in series, all facing the same way. What is the total voltage (in volts)? =
38. 38.Which of these is an insulator? (a) a metal paper clip (b) a graphite rod (c) a plastic straw (d) a steel spoon
39. 39.🔢 To get a sensor reading onto a phone, what comes right after “the sensor measures”? (a) the board reads it (b) the cloud stores it (c) it is sent by Wi-Fi (d) the app shows it
40. 40.True or false: a cotton thread is a conductor. (a) False (b) True

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