Electronics Worksheet: Final Test

Electronics lesson 30: Final electronics test · Set 606 · 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.🤖 if (temperature > 34) { show “Hot” } else if (temperature > 24) { show “Warm” } else { show “Cool” }
   The temperature is 11 °C. What is shown? (a) Warm (b) Hot (c) Cool
2. 2.True or false: the voltmeter measures current. (a) True (b) False
3. 3.🔦 A circuit has a new cell, a good bulb and a switch that is ON. One wire has come loose from the cell. A gap in one wire is bridged by a safety pin. Does the bulb glow? (a) Yes (b) No
4. 4.🔌 Is a copper wire a conductor or an insulator? (a) a conductor (b) an insulator
5. 5.True or false: on an LED, the leg by the flat edge is the cathode (−). (a) False (b) True
6. 6.🔘 Which kind of switch works only while pressed? (a) a slide switch (b) a reed switch (c) a push button (d) a toggle switch
7. 7.True or false: a table fan mainly makes movement. (a) True (b) False
8. 8.True or false: the ammeter measures voltage. (a) True (b) False
9. 9.Which of these is a good habit? (a) accept every permission (b) cover unused cameras (c) reuse one password (d) tap unknown app links
10. 10.⏱️ loop forever { LED ON; wait 600 ms; LED OFF; wait 550 ms }
    How many milliseconds does one blink (ON + OFF) take?
11. 11.🌈 A resistor has the colour bands orange, violet, red. What is its value (in ohms)?
12. 12.🔦 A circuit has a new cell, a good bulb and a switch that is ON. All the wires are firmly joined. Does the bulb glow? (a) No (b) Yes
13. 13.True or false: a dot where wires meet is the symbol for a junction. (a) False (b) True
14. 14.🧮 Resistors of 10 Ω, 68 Ω, 470 Ω and 47 Ω are joined in series. What is the total resistance (in ohms)?
15. 15.🔺 In the V-I-R triangle, how do we find I? (a) I = V × R (b) I = V ÷ R (c) I = V + R (d) I = R ÷ V
16. 16.🔘 Which kind of switch closes near a magnet? (a) a tilt switch (b) a reed switch (c) a toggle switch (d) a slide switch
17. 17.🔁 Is the circuit closed or open if the switch is OFF? (a) open (b) closed
18. 18.True or false: a ceiling fan mainly gives out heat. (a) True (b) False
19. 19.🔺 A current of 10 mA flows when 2 V is joined across a resistor. What is its resistance (in ohms)?
20. 20.💡 A red LED (it uses 2 V) is joined with a 300 Ω resistor to a 5 V supply. What current flows (in mA)?
21. 21.🔘 Which kind of switch springs back when let go? (a) a push button (b) a tilt switch (c) a reed switch (d) a slide switch
22. 22.⏱️ How many milliseconds are in 1 second? (a) 100 (b) 1000 (c) 60 (d) 10
23. 23.🔦 A circuit has a new cell, a bulb with a broken filament and a switch that is ON. All the wires are firmly joined. A gap in one wire is bridged by a safety pin. Does the bulb glow? (a) Yes (b) No
24. 24.True or false: on a cell, “usually the black wire” means the − (negative) end. (a) True (b) False
25. 25.⚡ Which formula gives electric power? (a) P = V + I (b) P = V ÷ I (c) P = I ÷ V (d) P = V × I
26. 26.True or false: to reuse one password is a risky habit. (a) False (b) True
27. 27.Which of these is true of a series circuit? (a) used in house wiring (b) one bulb out, all go out (c) each gets the full volts (d) many paths for current
28. 28.🔍 Which is the odd one out? (a) take cells out after use (b) touch a switch when wet (c) use small battery cells (d) stop if a part gets hot
29. 29.🔺 A current of 1 A flows through a 15 Ω resistor. What is the voltage across it (in volts)? =
30. 30.True or false: “a knob turned part way” is a digital signal. (a) True (b) False
31. 31.🤖 “if (A AND B)” is true when … (a) only A is true (b) both are false (c) both A and B are true (d) only B is true
32. 32.⚠️ About how many volts do home sockets in India supply? (a) 12 V (b) 1.5 V (c) 230 V (d) 9 V
33. 33.🔍 Which is the odd one out? (a) post your live location (b) install software updates (c) reuse one password (d) keep factory passwords
34. 34.Which drawing is the symbol for a resistor? (a) two or more cell symbols (b) a small empty box (c) a circle with V inside (d) many long-short pairs
35. 35.🌈 Which colour bands (1st digit, 2nd digit, multiplier) mark a 69000 Ω resistor? (a) blue-white-yellow (b) blue-white-orange (c) white-blue-orange (d) blue-white-red
36. 36.🗺️ In “input → process → output”, which part is the decision the program makes? (a) the input (b) the battery (c) the process (d) the output
37. 37.⏱️ loop forever { LED ON; wait 200 ms; LED OFF; wait 750 ms }
    How many milliseconds does one blink (ON + OFF) take?
38. 38.Which of these is measured in volts (V)? (a) voltage (b) how much a part resists (c) energy used each second (d) the flow of charge
39. 39.Which of these mainly gives out light? (a) a toaster (b) a water heater (c) an electric kettle (d) a night lamp
40. 40.Which of these is the process? (a) a temperature reading (b) a button press (c) count button presses (d) a buzzer beeps

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