Electronics Worksheet: Final Test

Electronics lesson 30: Final electronics test · Set 719 · 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.🔗 Series or parallel circuit: “each gets the full volts”? (a) series (b) parallel
2. 2.🤖 What is a microcontroller? (a) a type of battery (b) a big desktop computer (c) a kind of bulb (d) a computer on one chip
3. 3.🔋 8 identical 2 V cells are joined in series (+ of one cell to − of the next). What is the total voltage (in volts)? =
4. 4.💡 Does it save or waste electricity to use old filament bulbs? (a) saves electricity (b) wastes electricity
5. 5.🧮 Resistors of 330 Ω, 20 Ω and 470 Ω are joined in series. What is the total resistance (in ohms)?
6. 6.🤖 if (light < 300 OR motion) { porch lamp ON } else { porch lamp OFF }
   The light reading is 360 and motion is not detected (false). What happens? (a) porch lamp ON (b) porch lamp OFF
7. 7.🔋 What is a battery? (a) two or more cells joined (b) one single wire (c) a kind of bulb (d) a switch with a lid
8. 8.🔋 6 identical 1.5 V cells are joined in series, but one of them is put in the wrong way round. What is the total voltage now (in volts)? =
9. 9.🌈 A resistor has the colour bands white, violet, orange. What is its value (in ohms)?
10. 10.💡 In a parallel circuit, one bulb breaks. What happens to the others? (a) they all go out (b) they get dimmer (c) they keep glowing (d) they explode
11. 11.True or false: on a cell, “the flat end” means the − (negative) end. (a) True (b) False
12. 12.Which drawing is the symbol for a resistor? (a) triangle against a bar (b) a line lifted at a gap (c) a small empty box (d) a circle with a cross
13. 13.True or false: to take cells out after use is safe. (a) False (b) True
14. 14.🌐 What does IoT stand for? (a) Internet of Talk (b) Inside of Toys (c) Internet of Things (d) Input of Tools
15. 15.⚡ Which tiny particles drift along a metal wire to carry the current? (a) electrons (b) photons (c) dust particles (d) water drops
16. 16.What does a reed switch do? (a) works only while pressed (b) closes near a magnet (c) springs back when let go (d) stays where you flip it
17. 17.🤖 “if (A AND B)” is true when … (a) both A and B are true (b) both are false (c) only B is true (d) only A is true
18. 18.Which of these is a risky habit? (a) change default passwords (b) share camera links (c) set a strong password (d) read app permissions
19. 19.Which of these is safe? (a) open a phone charger (b) climb an electric pole (c) use a cable with cuts (d) fly kites in open fields
20. 20.🧩 A capacitor in a circuit can … (a) spin a wheel (b) measure heat (c) store charge briefly (d) make light
21. 21.True or false: a buzzer glows using little power. (a) False (b) True
22. 22.✏️ In a circuit diagram, which part is drawn as a circle with M inside? (a) junction (b) battery (c) wire (d) motor
23. 23.⏱️ A program says “wait 8750 ms”. How many seconds is that? =
24. 24.True or false: if a wire has come loose, the circuit is open and no current flows. (a) True (b) False
25. 25.⏱️ How many milliseconds are in 1 second? (a) 100 (b) 10 (c) 1000 (d) 60
26. 26.🔦 A circuit has a new cell, a good bulb and a switch that is OFF. All the wires are firmly joined. A gap in one wire is bridged by a rubber band. Does the bulb glow? (a) No (b) Yes
27. 27.🔍 Which is the odd one out? (a) share camera links (b) install software updates (c) keep factory passwords (d) reuse one password
28. 28.🔦 A circuit has a new cell, a good bulb and a switch that is OFF. All the wires are firmly joined. A gap in one wire is bridged by a rubber eraser. Does the bulb glow? (a) No (b) Yes
29. 29.🔺 A current of 20 mA flows when 8 V is joined across a resistor. What is its resistance (in ohms)?
30. 30.🤖 if (light < 500) { lamp ON } else { lamp OFF }
    The light sensor reads 352. What happens? (a) lamp OFF (b) lamp ON
31. 31.Which of these means the circuit is open? (a) the switch is ON (b) all wires are joined (c) a wire is cut (d) the loop is complete
32. 32.🔐 Is it a good or a risky habit to set a strong password? (a) risky habit (b) good habit
33. 33.🧮 Three equal 30 Ω resistors are joined in parallel. What is the total resistance (in ohms)?
34. 34.💡 5 identical bulbs are in parallel and each one takes 0.2 A. What total current (in amperes) comes from the battery? =
35. 35.🔺 The voltage stays the same and the resistance gets bigger. The current … (a) stays the same (b) gets smaller (c) gets bigger (d) becomes zero
36. 36.🤖 Does a plain wall switch usually have a microcontroller inside? (a) Yes (b) No
37. 37.🔋 On a cell, does “the end with a bump” mean the + end or the − end? (a) − (negative) (b) + (positive)
38. 38.⚡ A device works on 6 V and takes 0.5 A. What is its power (in watts)? =
39. 39.⚡ A 0.75 W device works on 3 V. What current does it take (in amperes)? =
40. 40.📶 Digital or analog: a button: pressed or not? (a) digital (b) analog

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