Electronics Worksheet: Final Test

Electronics lesson 30: Final electronics test · Set 78 · 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 mainly makes sound? (a) a tube light (b) a table fan (c) a buzzer (d) a rice cooker
2. 2.📏 In the water-pipe picture of a circuit, voltage is like … (a) the water pressure (b) the tap handle (c) the water tank lid (d) the pipe colour
3. 3.🌐 In an IoT system, which part measures the real world? (a) Wi-Fi (b) cloud server (c) actuator (d) sensor
4. 4.🔺 A 2.2 V supply is joined across a 220 Ω resistor. What current flows (in milliamperes, mA)?
5. 5.True or false: “own switch for each bulb” is true of a series circuit. (a) False (b) True
6. 6.🔺 A 3.75 V supply is joined across a 150 Ω resistor. What current flows (in milliamperes, mA)?
7. 7.📏 How many amperes (A) is 650 mA? =
8. 8.🧮 Resistors of 33 Ω, 470 Ω and 470 Ω are joined in series. What is the total resistance (in ohms)?
9. 9.True or false: a school bell mainly gives out heat. (a) True (b) False
10. 10.🔋 How many 1.2 V cells must be joined in series to give 2.4 V?
11. 11.📏 How many amperes (A) is 2900 mA? =
12. 12.🧮 Two equal 1000 Ω resistors are joined in parallel. What is the total resistance (in ohms)?
13. 13.🧾 Which lamp gives the same light for the least power? (a) a candle (b) an oil lamp (c) an LED lamp (d) a filament bulb
14. 14.⚡ A device works on 1.5 V and takes 3 A. What is its power (in watts)? =
15. 15.True or false: “bulbs share the voltage” is true of a series circuit. (a) False (b) True
16. 16.✏️ In a circuit diagram, wires are usually drawn as … (a) wavy lines (b) little stars (c) dotted circles (d) straight lines
17. 17.True or false: a microcontroller has a built-in keyboard. (a) True (b) False
18. 18.🔐 Is it a good or a risky habit to log out of shared phones? (a) good habit (b) risky habit
19. 19.🔁 x = 5
    repeat 5 times { x = x × 2 }
    What is x at the end?
20. 20.🔁 What does a variable do in a program? (a) blinks an LED (b) measures light (c) joins two wires (d) stores a value
21. 21.⏱️ How many milliseconds are in 1 second? (a) 60 (b) 10 (c) 1000 (d) 100
22. 22.Which of these is a good habit? (a) accept every permission (b) keep factory passwords (c) install software updates (d) reuse one password
23. 23.True or false: on a cell, “the longer symbol line” means the − (negative) end. (a) True (b) False
24. 24.🔦 A tester circuit has a new cell, a good bulb and wires with a gap between two clips. We put a safety pin across the gap. Does the bulb glow? (a) No (b) Yes
25. 25.🔍 Which is the odd one out? (a) a temperature sensor (b) a motion sensor (c) a keypad (d) a water pump
26. 26.🌈 Which band is read first on a resistor? (a) the gold band (b) the widest gap (c) any band (d) the one nearest an end
27. 27.💡 6 identical bulbs are in parallel and each one takes 0.25 A. What total current (in amperes) comes from the battery? =
28. 28.💡 3 identical bulbs are joined in series with a battery and a closed switch on the main wire. Bulb 2 is taken out of its holder. How many bulbs glow?
29. 29.🔦 A circuit has a new cell, a good bulb and a switch that is ON. All the wires are firmly joined. A gap in one wire is bridged by a dry cork. Does the bulb glow? (a) Yes (b) No
30. 30.True or false: to share only needed data is a good habit. (a) False (b) True
31. 31.⚙️ What is an actuator? (a) a sensor (b) an output that acts (c) a program (d) a battery
32. 32.True or false: to run fans in empty rooms saves electricity. (a) False (b) True
33. 33.📏 How many milliamperes (mA) is 1.69 A?
34. 34.🤖 Microcontroller or laptop: which one has a built-in keyboard? (a) microcontroller (b) laptop
35. 35.🔺 A current of 1 A flows through a 15 Ω resistor. What is the voltage across it (in volts)? =
36. 36.Which of these mainly gives out light? (a) a street light (b) a mixer grinder (c) a loudspeaker (d) a water heater
37. 37.🔁 count = 3
    while (count < 35) { count = count + 4 }
    How many times does the loop run?
38. 38.🔋 2 identical 2 V cells are joined in series (+ of one cell to − of the next). What is the total voltage (in volts)? =
39. 39.✏️ In a circuit diagram, which part is drawn as a circle with an X in it? (a) bulb (b) cell (c) ammeter (d) wire
40. 40.💡 Why is house wiring done in parallel? (a) to save copper only (b) so all go off together (c) to make bulbs dim (d) each gets full voltage

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