Electronics Worksheet: Final Test

Electronics lesson 30: Final electronics test · Set 396 · 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 steel spoon is an insulator. (a) False (b) True
2. 2.💡 6 identical bulbs are joined in parallel (each on its own side-by-side path) with a battery and a closed switch on the main wire. Bulb 3 is taken out of its holder. How many bulbs glow?
3. 3.💡 5 identical bulbs are joined in parallel across a 9 V battery (ideal wires). How many volts does each bulb get? =
4. 4.Which of these saves electricity? (a) leave the TV on standby (b) run fans in empty rooms (c) use daylight to read (d) leave fridge door open
5. 5.🔁 What does a variable do in a program? (a) measures light (b) joins two wires (c) blinks an LED (d) stores a value
6. 6.🧩 Which component turns a fan or wheels? (a) buzzer (b) capacitor (c) motor (d) thermistor
7. 7.🔁 x = 2
   repeat 5 times { x = x × 2 }
   What is x at the end?
8. 8.🧮 Two equal 220 Ω resistors are joined in parallel. What is the total resistance (in ohms)?
9. 9.🔺 A 1 V supply is joined across a 100 Ω resistor. What current flows (in milliamperes, mA)?
10. 10.Which of these wastes electricity? (a) unplug idle chargers (b) use old filament bulbs (c) switch off empty rooms (d) set the AC to 24 °C
11. 11.🔘 A cell and a bulb are joined to 2 side-by-side paths with one switch on each path — A and B (parallel). A is ON and B is ON. Does the bulb glow? (a) Yes (b) No
12. 12.📶 How many states can a digital pin have? (a) a thousand (b) one (c) two (d) ten
13. 13.🌐 In an IoT system, which part carries the data? (a) cloud server (b) Wi-Fi (c) actuator (d) phone app
14. 14.Which drawing is the symbol for a resistor? (a) a long and a short line (b) a plain rectangle (c) a straight line (d) a circle with an X in it
15. 15.Which of these is a good habit? (a) share camera links (b) change default passwords (c) tap unknown app links (d) post your live location
16. 16.💡 4 identical bulbs are joined in series with a battery and a closed switch on the main wire. Bulb 3 is taken out of its holder. How many bulbs glow?
17. 17.🤖 Does a toy robot usually have a microcontroller inside? (a) Yes (b) No
18. 18.🗺️ In an input → process → output plan, is “a temperature reading” the input, the process or the output? (a) process (b) output (c) input
19. 19.🧮 Three equal 300 Ω resistors are joined in parallel. What is the total resistance (in ohms)?
20. 20.True or false: a safety pin is a conductor. (a) False (b) True
21. 21.💡 In a series circuit, how many paths does the current have? (a) none (b) one for each bulb (c) one (d) two
22. 22.🤖 Does a washing machine usually have a microcontroller inside? (a) No (b) Yes
23. 23.🔌 Is a woollen thread a conductor or an insulator? (a) a conductor (b) an insulator
24. 24.True or false: how much a part resists is measured in volts (V). (a) True (b) False
25. 25.True or false: a push button flips up or down. (a) True (b) False
26. 26.True or false: resistance is measured in amperes (A). (a) False (b) True
27. 27.⚙️ What is an actuator? (a) a sensor (b) a battery (c) a program (d) an output that acts
28. 28.🌈 Which band is read first on a resistor? (a) the gold band (b) any band (c) the widest gap (d) the one nearest an end
29. 29.💡 4 identical bulbs are joined in parallel across a 4.5 V battery (ideal wires). How many volts does each bulb get? =
30. 30.Which drawing is the symbol for an LED? (a) triangle, bar and arrows (b) a circle with an X in it (c) a dot where wires meet (d) one tall, one short bar
31. 31.What does a capacitor do? (a) is a resistance knob (b) lets current go one way (c) stores a little charge (d) boosts a small signal
32. 32.💡 A battery lights 2 identical bulbs joined in series. One more identical bulb is added in series. How do the bulbs glow now? (a) dimmer (b) brighter (c) the same
33. 33.🔍 Which is the odd one out? (a) a night lamp (b) a loudspeaker (c) an LED lamp (d) a street light
34. 34.⚡ A device works on 1.5 V and takes 0.2 A. What is its power (in watts)? =
35. 35.🔋 5 identical 1.5 V cells are joined in series (+ of one cell to − of the next). What is the total voltage (in volts)? =
36. 36.⚡ A device works on 12 V and takes 3 A. What is its power (in watts)? =
37. 37.Which of these is a conductor? (a) a rubber eraser (b) a metal paper clip (c) a ceramic cup (d) a plastic ruler
38. 38.⚡ A device works on 1.5 V and takes 2 A. What is its power (in watts)? =
39. 39.Which of these has no microcontroller inside? (a) a TV remote (b) a candle (c) a digital thermometer (d) a microwave oven
40. 40.🔁 total = 0
    for i = 1 to 7 { total = total + i }
    What is total at the end?

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