Electronics Worksheet: Final Test

Electronics lesson 30: Final electronics test · Set 336 · 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) becomes zero (c) stays the same (d) gets bigger
2. 2.🤖 if (light < 300 AND motion) { porch lamp ON } else { porch lamp OFF }
   The light reading is 210 and motion is not detected (false). What happens? (a) porch lamp OFF (b) porch lamp ON
3. 3.True or false: to accept every permission is a risky habit. (a) False (b) True
4. 4.🔍 Which is the odd one out? (a) change default passwords (b) set a strong password (c) install software updates (d) share camera links
5. 5.What does a slide switch do? (a) closes near a magnet (b) stays where you flip it (c) works only while pressed (d) slides side to side
6. 6.🔌 Is a motion sensor an input or an output for a microcontroller? (a) output (b) input
7. 7.🔋 On a cell, does “usually the black wire” mean the + end or the − end? (a) − (negative) (b) + (positive)
8. 8.🔋 2 identical 2 V cells are joined side by side in parallel (all + ends together, all − ends together). What is the voltage across them (in volts)? =
9. 9.🔍 Which is the odd one out? (a) set the AC to 24 °C (b) run fans in empty rooms (c) switch off empty rooms (d) use daylight to read
10. 10.🤖 if (temperature > 34) { show “Hot” } else if (temperature > 19) { show “Warm” } else { show “Cool” }
    The temperature is 12 °C. What is shown? (a) Hot (b) Cool (c) Warm
11. 11.🔌 Is a keypad an input or an output for a microcontroller? (a) input (b) output
12. 12.🧮 Two equal 10 Ω resistors are joined in parallel. What is the total resistance (in ohms)?
13. 13.💡 A red LED uses 2 V and should get 20 mA. It runs from a 6 V supply. What resistor (in ohms) is needed in series?
14. 14.True or false: a circle with M inside is the symbol for a bulb. (a) True (b) False
15. 15.True or false: a candle has no microcontroller inside. (a) True (b) False
16. 16.Which of these is a risky habit? (a) install software updates (b) set a strong password (c) share only needed data (d) ignore update messages
17. 17.What does a push button do? (a) works only while pressed (b) stays where you flip it (c) slides side to side (d) closes when tipped over
18. 18.🔋 How many 3 V cells must be joined in series to give 21 V?
19. 19.True or false: on an LED, the longer leg is the anode (+). (a) False (b) True
20. 20.🧩 Which component limits the current? (a) fuse (b) diode (c) capacitor (d) resistor
21. 21.🔍 Which is the odd one out? (a) a sound sensor (b) a light sensor (c) an LED (d) a temperature sensor
22. 22.🔋 3 identical 1.2 V cells are joined side by side in parallel (all + ends together, all − ends together). What is the voltage across them (in volts)? =
23. 23.💡 6 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. Does bulb 5 glow? (a) Yes (b) No
24. 24.🔌 Is a steel coin a conductor or an insulator? (a) an insulator (b) a conductor
25. 25.🌐 Is a paper calendar an IoT device? (a) not an IoT device (b) an IoT device
26. 26.🔋 Does a wind turbine give electricity or use electricity? (a) uses electricity (b) gives electricity
27. 27.🔌 Is a light sensor an input or an output for a microcontroller? (a) input (b) output
28. 28.True or false: an LED lets current go one way. (a) True (b) False
29. 29.True or false: triangle against a bar is the symbol for a diode. (a) True (b) False
30. 30.True or false: an LED blows if current is high. (a) False (b) True
31. 31.🔁 Is the circuit closed or open if the switch is OFF? (a) open (b) closed
32. 32.🔁 repeat 4 times { repeat 6 times { beep } }
    How many beeps are there?
33. 33.Which of these means the circuit is open? (a) the switch is ON (b) the switch is OFF (c) all wires are joined (d) the loop is complete
34. 34.🔺 In the V-I-R triangle, how do we find R? (a) R = V + I (b) R = V ÷ I (c) R = I ÷ V (d) R = V × I
35. 35.🔘 Switch A is on the main wire next to the cell and the bulb; then the wire splits into two side-by-side paths, one with switch B and one with switch C. A is ON, B is OFF and C is ON. Does the bulb glow? (a) Yes (b) No
36. 36.⚡ An 18 W device works on 9 V. What current does it take (in amperes)? =
37. 37.🧮 A 0.6 V battery is joined to 2 Ω and 4 Ω resistors in series. What current flows (in amperes)? =
38. 38.🔢 To get a sensor reading onto a phone, what comes right after “the board reads it”? (a) the cloud stores it (b) the sensor measures (c) the app shows it (d) it is sent by Wi-Fi
39. 39.🔘 A cell and a bulb are joined to two side-by-side paths: path 1 has switches A and B one after another, path 2 has switch C. A is OFF, B is OFF and C is OFF. Does the bulb glow? (a) Yes (b) No
40. 40.🧾 One “unit” on an electricity bill is … (a) 1 volt (b) 1 ampere (c) 1 watt (d) 1 kilowatt-hour (kWh)

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