Electronics Worksheet: Final Test

Electronics lesson 30: Final electronics test · Set 849 · 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.🔦 A tester circuit has a new cell, a good bulb and wires with a gap between two clips. We put a dry cork across the gap. Does the bulb glow? (a) No (b) Yes
2. 2.Which of these mainly makes sound? (a) a school bell (b) a traffic signal (c) an LED lamp (d) an exhaust fan
3. 3.🔺 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
4. 4.🌈 A resistor has the colour bands green, orange, red. What is its value (in ohms)?
5. 5.Which drawing is the symbol for a switch? (a) a circle with an X in it (b) a circle with A inside (c) a line lifted at a gap (d) a circle with a cross
6. 6.🔋 3 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)? =
7. 7.True or false: “each gets the full volts” is true of a parallel circuit. (a) True (b) False
8. 8.📶 How many states can a digital pin have? (a) a thousand (b) one (c) two (d) ten
9. 9.🔋 4 identical 1.5 V cells are joined side by side in parallel (all + ends together, all − ends together). What is the voltage across them (in volts)? =
10. 10.🔺 A current of 0.2 A flows through a 20 Ω resistor. What is the voltage across it (in volts)? =
11. 11.🔍 Which is the odd one out? (a) a small display (b) a turning knob (c) a push button (d) a keypad
12. 12.🔍 Which is the odd one out? (a) a paper strip (b) a brass key (c) a metal paper clip (d) an iron nail
13. 13.🔁 repeat 2 times { repeat 2 times { beep } }
    How many beeps are there?
14. 14.✏️ In a circuit diagram, which part is drawn as a circle with A inside? (a) battery (b) ammeter (c) resistor (d) capacitor
15. 15.🤖 Does a smart watch usually have a microcontroller inside? (a) Yes (b) No
16. 16.🤖 if (light < 300 OR motion) { porch lamp ON } else { porch lamp OFF }
    The light reading is 120 and motion is detected (true). What happens? (a) porch lamp ON (b) porch lamp OFF
17. 17.⏱️ What does “wait 500 ms” do? (a) waits 500 seconds (b) blinks 500 times (c) pauses for half a second (d) turns the LED off
18. 18.Which of these has no microcontroller inside? (a) a TV remote (b) a digital alarm clock (c) a plain wall switch (d) a toy robot
19. 19.⏱️ How many milliseconds are in 1 second? (a) 60 (b) 100 (c) 10 (d) 1000
20. 20.Which of these is a conductor? (a) a steel spoon (b) a ceramic cup (c) a rubber eraser (d) a woollen thread
21. 21.🧮 Resistors of 68 Ω and 220 Ω are joined in series. What is the total resistance (in ohms)?
22. 22.📶 Digital or analog: the room temperature? (a) analog (b) digital
23. 23.🔁 repeat 2 times { repeat 4 times { beep } }
    How many beeps are there?
24. 24.📏 How many amperes (A) is 20 mA? =
25. 25.Which of these is an insulator? (a) a steel spoon (b) aluminium foil (c) a copper wire (d) a woollen thread
26. 26.🔺 A current of 10 mA flows through a 150 Ω resistor. What is the voltage across it (in volts)? =
27. 27.🔐 Is it a good or a risky habit to share the Wi-Fi key? (a) good habit (b) risky habit
28. 28.Which job is done by the main chip? (a) shows the board is on (b) keeps the voltage steady (c) runs the program (d) connect sensors and LEDs
29. 29.💡 2 identical bulbs are joined in series with a 6 V battery (ideal wires). How many volts does each bulb get? =
30. 30.True or false: “decide if soil is dry” is the process. (a) True (b) False
31. 31.True or false: a night lamp mainly makes sound. (a) True (b) False
32. 32.True or false: a washing machine usually has a microcontroller inside. (a) True (b) False
33. 33.True or false: how much a part resists is measured in ohms (Ω). (a) True (b) False
34. 34.🔍 Which is the odd one out? (a) an app-controlled bulb (b) a battery torch (c) a smart energy meter (d) a Wi-Fi doorbell camera
35. 35.🤖 Microcontroller or laptop: which one has no screen of its own? (a) microcontroller (b) laptop
36. 36.📏 Which unit measures the push of a cell? (a) ohm (Ω) (b) watt (W) (c) ampere (A) (d) volt (V)
37. 37.⚡ What does a room heater mainly change electricity into? (a) movement (b) heat (c) light (d) sound
38. 38.📶 Digital or analog: a button: pressed or not? (a) analog (b) digital
39. 39.Which of these is not an IoT device? (a) a Wi-Fi smart plug (b) a pencil sharpener (c) a fitness band with app (d) an app-controlled bulb
40. 40.True or false: “how bright a room is” is an analog signal. (a) False (b) True

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