Electronics Worksheet: Final Test

Electronics lesson 30: Final electronics test · Set 164 · 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.🔺 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
2. 2.🔁 A bulb has two contacts. How many must be joined into the loop for it to glow? (a) only one (b) none (c) both of them (d) it does not matter
3. 3.📶 How many states can a digital pin have? (a) ten (b) two (c) a thousand (d) one
4. 4.✏️ In a circuit diagram, wires are usually drawn as … (a) wavy lines (b) little stars (c) dotted circles (d) straight lines
5. 5.🔘 Which kind of switch springs back when let go? (a) a tilt switch (b) a toggle switch (c) a push button (d) a reed switch
6. 6.🔢 To run one loop of a plant-watering program, which comes first: “wait a few seconds” or “read the soil sensor”? (a) read the soil sensor (b) wait a few seconds
7. 7.💡 6 identical bulbs are joined in series with a battery and a closed switch on the main wire. Bulb 5 is taken out of its holder. Does bulb 6 glow? (a) Yes (b) No
8. 8.Which of these uses electricity? (a) a bicycle dynamo (b) a battery (c) a mobile phone (d) a power station
9. 9.🔁 In an old-style bulb, which thin wire glows when current flows? (a) the base (b) the glass (c) the switch (d) the filament
10. 10.Which of these is an insulator? (a) an iron nail (b) aluminium foil (c) a woollen thread (d) a metal paper clip
11. 11.True or false: a wooden stick is an insulator. (a) False (b) True
12. 12.🤖 Does a bicycle bell usually have a microcontroller inside? (a) No (b) Yes
13. 13.🔐 Is it a good or a risky habit to post your live location? (a) good habit (b) risky habit
14. 14.⚠️ Someone is getting a shock and is still touching a wire. What should you do? (a) shout for an adult (b) pull them by the hand (c) wait and watch (d) pour water on them
15. 15.True or false: voltage is measured in ohms (Ω). (a) False (b) True
16. 16.🔌 Which part of a screwdriver should an electrician hold? (a) the plastic handle (b) the steel shaft (c) the metal tip (d) the bare end
17. 17.🧾 A 100 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
18. 18.🔁 What does “count = count + 1” do? (a) sets count to 1 (b) prints 1 (c) takes 1 away (d) adds 1 to count
19. 19.🌐 Each reading a sensor sends is 10 bytes. How many bytes do 20 readings take?
20. 20.💡 Old festival light strings went fully dark when one bulb failed. How were they joined? (a) by Wi-Fi (b) not joined (c) in series (d) in parallel
21. 21.True or false: a straight line is the symbol for a wire. (a) False (b) True
22. 22.What does a resistor do? (a) glows using little power (b) is a resistance knob (c) limits the current (d) senses how bright it is
23. 23.True or false: “a break stops every bulb” is true of a series circuit. (a) False (b) True
24. 24.True or false: on a cell, “the shorter symbol line” means the + (positive) end. (a) True (b) False
25. 25.⏱️ What does “wait 500 ms” do? (a) waits 500 seconds (b) turns the LED off (c) pauses for half a second (d) blinks 500 times
26. 26.✏️ Why do engineers draw circuits with symbols? (a) quick and clear for all (b) to hide the circuit (c) to make it colourful (d) symbols are heavier
27. 27.Which of these uses electricity? (a) a generator (b) a power station (c) a solar panel (d) a refrigerator
28. 28.🔢 To run one loop of a plant-watering program, which comes first: “read the soil sensor” or “compare with the limit”? (a) compare with the limit (b) read the soil sensor
29. 29.🌈 A resistor has the colour bands brown, green, red. What is its value (in ohms)?
30. 30.Which drawing is the symbol for a resistor? (a) a line lifted at a gap (b) one tall, one short bar (c) a small empty box (d) a circle with V inside
31. 31.💡 4 identical bulbs are joined in series with a 12 V battery (ideal wires). How many volts does each bulb get? =
32. 32.🔺 A current of 0.2 A flows through a 3 Ω resistor. What is the voltage across it (in volts)? =
33. 33.🔗 Series or parallel circuit: “a break stops every bulb”? (a) parallel (b) series
34. 34.🤖 if (light < 400 AND motion) { porch lamp ON } else { porch lamp OFF }
    The light reading is 550 and motion is not detected (false). What happens? (a) porch lamp ON (b) porch lamp OFF
35. 35.🔍 Which is the odd one out? (a) change default passwords (b) log out of shared phones (c) read app permissions (d) keep factory passwords
36. 36.📏 Voltmeter or ammeter: which one is joined in series? (a) voltmeter (b) ammeter
37. 37.⏱️ repeat 6 times { buzzer ON; wait 900 ms; buzzer OFF; wait 600 ms }
    How many milliseconds does this take in all?
38. 38.🗺️ In an input → process → output plan, is “compare with a limit” the input, the process or the output? (a) input (b) output (c) process
39. 39.🧩 Which component lets current go one way? (a) motor (b) capacitor (c) transistor (d) diode
40. 40.What does a transistor do? (a) lets current go one way (b) is a resistance knob (c) boosts a small signal (d) glows using little power

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