Electronics Worksheet: Final Test

Electronics lesson 30: Final electronics test · Set 437 · 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.🔋 2 identical 3 V cells are joined side by side in parallel (all + ends together, all − ends together). What is the voltage across them (in volts)? =
2. 2.⚠️ Is it safe to use mains for a project? (a) safe (b) not safe
3. 3.🔗 Series or parallel circuit: “a single current path”? (a) series (b) parallel
4. 4.🔘 Which kind of switch slides side to side? (a) a toggle switch (b) a slide switch (c) a push button (d) a tilt switch
5. 5.🔐 Is it a good or a risky habit to turn off unused gadgets? (a) risky habit (b) good habit
6. 6.🧾 A family uses 120 units of electricity in a month and each unit costs ₹7. What is the bill (in ₹)?
7. 7.🔦 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 wooden stick. Does the bulb glow? (a) No (b) Yes
8. 8.💡 A blue LED uses 3 V and should get 20 mA. It runs from a 12 V supply. What resistor (in ohms) is needed in series?
9. 9.🧭 Which part of a microcontroller board restarts the program? (a) the pins (b) the USB port (c) the main chip (d) the reset button
10. 10.🔢 To plan an electronics project, which comes first: “test it and fix it” or “pick a problem to solve”? (a) pick a problem to solve (b) test it and fix it
11. 11.⚡ A 12 W device works on 6 V. What current does it take (in amperes)? =
12. 12.True or false: a microcontroller uses very little power. (a) True (b) False
13. 13.True or false: the flow of charge is measured in volts (V). (a) False (b) True
14. 14.🔍 Which is the odd one out? (a) a rubber band (b) a plastic ruler (c) a woollen thread (d) a steel coin
15. 15.Which job is done by the USB port? (a) keeps the voltage steady (b) runs the program (c) brings power and code (d) connect sensors and LEDs
16. 16.🔐 Is it a good or a risky habit to set up with a parent? (a) risky habit (b) good habit
17. 17.💡 On an LED, is the longer leg the anode (+) or the cathode (−)? (a) cathode (−) (b) anode (+)
18. 18.🔺 A 6 V supply is joined across a 6 Ω resistor. What current flows (in amperes)? =
19. 19.🔍 Which is the odd one out? (a) an exhaust fan (b) a table fan (c) a mixer grinder (d) a rice cooker
20. 20.Which of these is an output? (a) a light sensor (b) a turning knob (c) a temperature sensor (d) a speaker
21. 21.🔦 A tester circuit has a new cell, a good bulb and wires with a gap between two clips. We put a glass marble across the gap. Does the bulb glow? (a) Yes (b) No
22. 22.🔗 Series or parallel circuit: “one bulb out, all go out”? (a) parallel (b) series
23. 23.Which of these is true of a series circuit? (a) own switch for each bulb (b) many paths for current (c) each gets the full volts (d) bulbs share the voltage
24. 24.🔺 A current of 0.2 A flows through a 4 Ω resistor. What is the voltage across it (in volts)? =
25. 25.True or false: a circle with an X in it is the symbol for a junction. (a) True (b) False
26. 26.🔁 total = 0
    for i = 1 to 10 { total = total + i }
    What is total at the end?
27. 27.⏱️ loop forever { LED ON; wait 550 ms; LED OFF; wait 450 ms }
    How many milliseconds does one blink (ON + OFF) take?
28. 28.🧩 A capacitor in a circuit can … (a) spin a wheel (b) make light (c) store charge briefly (d) measure heat
29. 29.True or false: to install software updates is a good habit. (a) True (b) False
30. 30.🔁 repeat 4 times { repeat 4 times { beep } }
    How many beeps are there?
31. 31.🧩 Which part changes electrical energy into sound? (a) a resistor (b) a capacitor (c) a diode (d) a buzzer
32. 32.🔍 Which is the odd one out? (a) stop if a part gets hot (b) dry your hands first (c) use small battery cells (d) climb an electric pole
33. 33.True or false: the voltmeter measures current. (a) False (b) True
34. 34.💡 A battery lights 2 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
35. 35.💡 2 identical bulbs are joined in parallel across a 12 V battery (ideal wires). How many volts does each bulb get? =
36. 36.📏 Voltmeter or ammeter: which one measures voltage? (a) ammeter (b) voltmeter
37. 37.🔁 Is the circuit closed or open if the loop is complete? (a) closed (b) open
38. 38.True or false: a tube light mainly makes sound. (a) False (b) True
39. 39.True or false: if the switch is OFF, the circuit is closed and current flows. (a) True (b) False
40. 40.📏 Voltmeter or ammeter: which one measures current? (a) voltmeter (b) ammeter

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