Electronics Worksheet: Final Test

Electronics lesson 30: Final electronics test · Set 331 · 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.Which of these is an input? (a) a turning knob (b) a motor (c) a speaker (d) a servo motor
2. 2.🔺 In the V-I-R triangle, how do we find R? (a) R = V ÷ I (b) R = V + I (c) R = V × I (d) R = I ÷ V
3. 3.🔍 Which is the odd one out? (a) post your live location (b) set a strong password (c) share the Wi-Fi key (d) share camera links
4. 4.🔘 What does a switch do in a circuit? (a) changes the voltage (b) stores current (c) opens or closes the loop (d) makes electricity
5. 5.💡 An LED (with its resistor) is on pin 7. All pins start LOW. The program runs once:
   set pin 8 HIGH
   set pin 7 LOW
   set pin 8 HIGH
   Is the LED ON or OFF at the end? (a) ON (b) OFF
6. 6.Which of these means the circuit is open? (a) the bulb is unscrewed (b) the switch is ON (c) the loop is complete (d) all wires are joined
7. 7.🔗 Series or parallel circuit: “one out, the rest glow”? (a) parallel (b) series
8. 8.True or false: “a break stops every bulb” is true of a parallel circuit. (a) False (b) True
9. 9.🧮 A 2.4 V battery is joined to 10 Ω and 2 Ω resistors in series. What current flows (in amperes)? =
10. 10.True or false: to dry your hands first is safe. (a) True (b) False
11. 11.⏱️ How many milliseconds is a wait of 4.3 seconds?
12. 12.🌈 A resistor has the colour bands grey, yellow, orange. What is its value (in ohms)?
13. 13.🔦 A circuit has a new cell, a good bulb and a switch that is ON. One wire has come loose from the cell. Does the bulb glow? (a) Yes (b) No
14. 14.🧾 A 1000 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
15. 15.⚡ A 24 W device works on 12 V. What current does it take (in amperes)? =
16. 16.🧾 Which lamp gives the same light for the least power? (a) an oil lamp (b) a filament bulb (c) an LED lamp (d) a candle
17. 17.True or false: if the switch is OFF, the circuit is open and no current flows. (a) True (b) False
18. 18.🔍 For a microcontroller, is a sensor an input or an output? (a) a power source (b) an output (c) an input (d) a fuse
19. 19.🤖 if (light < 400 AND motion) { porch lamp ON } else { porch lamp OFF }
    The light reading is 530 and motion is detected (true). What happens? (a) porch lamp ON (b) porch lamp OFF
20. 20.True or false: “many paths for current” is true of a series circuit. (a) True (b) False
21. 21.⚠️ What protects home wiring by melting or tripping when too much current flows? (a) a bulb (b) a plug top (c) a fuse or MCB (d) a long wire
22. 22.🔍 Which is the odd one out? (a) a rubber band (b) an iron nail (c) a brass key (d) a safety pin
23. 23.🔌 Is a copper wire a conductor or an insulator? (a) an insulator (b) a conductor
24. 24.Which of these is a good habit? (a) install software updates (b) post your live location (c) ignore update messages (d) share the Wi-Fi key
25. 25.💡 On an LED, is the round-side leg the anode (+) or the cathode (−)? (a) cathode (−) (b) anode (+)
26. 26.🔍 Which is the odd one out? (a) build with an adult near (b) stop if a part gets hot (c) stay away from pylons (d) open a phone charger
27. 27.🧮 Resistors of 33 Ω and 47 Ω are joined in series. What is the total resistance (in ohms)?
28. 28.🔍 Which is the odd one out? (a) a ceiling fan (b) a night lamp (c) a street light (d) a tube light
29. 29.💡 Why is house wiring done in parallel? (a) to save copper only (b) to make bulbs dim (c) so all go off together (d) each gets full voltage
30. 30.🤖 if (temperature > 33) { show “Hot” } else if (temperature > 18) { show “Warm” } else { show “Cool” }
    The temperature is 39 °C. What is shown? (a) Hot (b) Warm (c) Cool
31. 31.Which job needs a temperature sensor? (a) close a window in rain (b) open blinds at sunrise (c) water a dry plant (d) keep an incubator warm
32. 32.🔘 Two switches are in parallel (side by side). When does the bulb glow? (a) only when both are OFF (b) when either is ON (c) only when both are ON (d) never
33. 33.🌐 A weather station sends one reading every 5 seconds. How many readings does it send in 5 minutes?
34. 34.🔍 Which is the odd one out? (a) log out of shared phones (b) read app permissions (c) post your live location (d) set a strong password
35. 35.✏️ In a circuit diagram, which part is drawn as a small empty box? (a) cell (b) resistor (c) capacitor (d) battery
36. 36.✏️ In a cell symbol, which line is the + terminal? (a) both lines (b) neither line (c) the longer line (d) the shorter line
37. 37.🗺️ In an input → process → output plan, is “the pump turns on” the input, the process or the output? (a) input (b) output (c) process
38. 38.🌈 A resistor has the colour bands red, violet, brown. What is its value (in ohms)?
39. 39.🔺 A 24 V supply is joined across an 8 Ω resistor. What current flows (in amperes)? =
40. 40.🔗 Series or parallel circuit: “many paths for current”? (a) series (b) parallel

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