Electronics Worksheet: Final Test

Electronics lesson 30: Final electronics test · Set 622 · 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.🔁 total = 0
   for i = 1 to 11 { total = total + i }
   What is total at the end?
2. 2.🔍 Which is the odd one out? (a) a small display (b) a speaker (c) a sound sensor (d) a servo motor
3. 3.🔦 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 woollen thread. Does the bulb glow? (a) No (b) Yes
4. 4.Which of these is a conductor? (a) a plastic ruler (b) a cotton thread (c) a paper strip (d) aluminium foil
5. 5.🧭 Which part of a microcontroller board keeps the voltage steady? (a) the power LED (b) the main chip (c) the pins (d) the voltage regulator
6. 6.🔍 Which is the odd one out? (a) a glass marble (b) a plastic ruler (c) an iron nail (d) a plastic straw
7. 7.🔋 What should you do with used-up cells? (a) throw them in a fire (b) cut them open (c) bury them in soil (d) give them for recycling
8. 8.Which of these saves electricity? (a) iron one shirt at a time (b) leave the TV on standby (c) close the fridge quickly (d) leave fridge door open
9. 9.🌈 Which colour bands (1st digit, 2nd digit, multiplier) mark a 28000 Ω resistor? (a) red-grey-orange (b) red-grey-yellow (c) red-grey-red (d) grey-red-orange
10. 10.What does an LED do? (a) makes a beeping sound (b) limits the current (c) blows if current is high (d) glows using little power
11. 11.⏱️ What does “wait 500 ms” do? (a) blinks 500 times (b) waits 500 seconds (c) pauses for half a second (d) turns the LED off
12. 12.⚠️ Is it safe to stop if a part gets hot? (a) not safe (b) safe
13. 13.🔺 A current of 3 A flows through a 5 Ω resistor. What is the voltage across it (in volts)? =
14. 14.🔁 x = 5
    repeat 1 time { x = x × 2 }
    What is x at the end?
15. 15.🔋 A 6 V battery and three 1.5 V cells are joined in series, all facing the same way. What is the total voltage (in volts)? =
16. 16.True or false: a digital alarm clock usually has a microcontroller inside. (a) True (b) False
17. 17.True or false: on a cell, “the longer symbol line” means the + (positive) end. (a) False (b) True
18. 18.🔺 In the V-I-R triangle, how do we find V? (a) V = I + R (b) V = I ÷ R (c) V = R ÷ I (d) V = I × R
19. 19.⏱️ loop forever { LED ON; wait 250 ms; LED OFF; wait 300 ms }
    How many milliseconds does one blink (ON + OFF) take?
20. 20.🧮 A 3 V battery is joined to 2 Ω and 10 Ω resistors in series. What current flows (in amperes)? =
21. 21.🔺 A current of 20 mA flows through a 100 Ω resistor. What is the voltage across it (in volts)? =
22. 22.True or false: if the bulb is unscrewed, the circuit is closed and current flows. (a) True (b) False
23. 23.🔘 Two switches are in parallel (side by side). When does the bulb glow? (a) only when both are ON (b) never (c) when either is ON (d) only when both are OFF
24. 24.🔐 Is it a good or a risky habit to change default passwords? (a) risky habit (b) good habit
25. 25.🔺 A current of 1 A flows through a 3 Ω resistor. What is the voltage across it (in volts)? =
26. 26.🤖 if (light < 200 AND motion) { porch lamp ON } else { porch lamp OFF }
    The light reading is 530 and motion is detected (true). What happens? (a) porch lamp OFF (b) porch lamp ON
27. 27.📶 On a 5 V board, a pin set HIGH gives about … (a) 230 V (b) 0 V (c) 50 V (d) 5 V
28. 28.🗺️ In an input → process → output plan, is “the fan starts” the input, the process or the output? (a) process (b) output (c) input
29. 29.True or false: to use daylight to read saves electricity. (a) False (b) True
30. 30.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 9 hours. How many watt-hours (Wh) are saved?
31. 31.True or false: a toy robot has no microcontroller inside. (a) False (b) True
32. 32.True or false: a thermistor blows if current is high. (a) False (b) True
33. 33.Which of these mainly gives out light? (a) a loudspeaker (b) a water heater (c) a night lamp (d) an exhaust fan
34. 34.🤖 if (distance < 20) { buzzer beeps } else { buzzer is silent }
    The distance sensor reads 16 cm. What happens? (a) buzzer beeps (b) buzzer is silent
35. 35.🌈 Which colour bands (1st digit, 2nd digit, multiplier) mark a 1000 Ω resistor? (a) brown-black-brown (b) brown-black-orange (c) red-brown-red (d) brown-black-red
36. 36.🧭 Which part of a microcontroller board shows the board is on? (a) the voltage regulator (b) the power LED (c) the main chip (d) the pins
37. 37.🔘 When a switch is ON, the circuit is … (a) cut (b) broken (c) closed (d) open
38. 38.What does the microcontroller do? (a) reads values, decides (b) acts on a command (c) stores data online (d) carries the data
39. 39.Which of these is not an IoT device? (a) a Wi-Fi doorbell camera (b) a fitness band with app (c) an app-controlled bulb (d) a plain table fan
40. 40.🔺 A current of 25 mA flows when 7.5 V is joined across a resistor. What is its resistance (in ohms)?

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