Electronics Worksheet: Final Test

Electronics lesson 30: Final electronics test · Set 407 · 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 a risky habit? (a) set a strong password (b) keep factory passwords (c) read app permissions (d) turn off unused gadgets
2. 2.🔍 Which is the odd one out? (a) stay away from pylons (b) use small battery cells (c) poke things in a socket (d) keep drinks far away
3. 3.🔁 total = 0
   for i = 1 to 8 { total = total + i }
   What is total at the end?
4. 4.🔍 Which is the odd one out? (a) take cells out after use (b) use small battery cells (c) stay away from pylons (d) throw cells in a fire
5. 5.💡 2 identical bulbs are joined in parallel (each on its own side-by-side path) with a battery and a closed switch on the main wire. Bulb 2 is taken out of its holder. How many bulbs glow?
6. 6.🔐 Is it a good or a risky habit to share only needed data? (a) good habit (b) risky habit
7. 7.Which of these means the circuit is closed? (a) a cell is taken out (b) the bulb is unscrewed (c) a wire has come loose (d) the loop is complete
8. 8.🔍 Which is the odd one out? (a) a steel spoon (b) a graphite rod (c) a rubber eraser (d) a brass key
9. 9.Which of these means the circuit is open? (a) the loop is complete (b) all wires are joined (c) a wire is cut (d) the switch is ON
10. 10.Which of these usually has a microcontroller inside? (a) a wind-up toy (b) a candle (c) a hand pump (d) a digital alarm clock
11. 11.True or false: on an LED, the leg by the flat edge is the anode (+). (a) True (b) False
12. 12.🔋 Does a battery give electricity or use electricity? (a) uses electricity (b) gives electricity
13. 13.True or false: on an LED, the round-side leg is the anode (+). (a) False (b) True
14. 14.⚠️ Who should be with you when you build a circuit? (a) a younger child (b) a stranger online (c) nobody (d) a trusted adult
15. 15.🔦 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 graphite rod. Does the bulb glow? (a) Yes (b) No
16. 16.🔍 Which is the odd one out? (a) a room heater (b) an electric kettle (c) a torch (d) an electric iron
17. 17.🌈 A resistor has the colour bands orange, yellow, black. What is its value (in ohms)?
18. 18.🔍 For a microcontroller, is a sensor an input or an output? (a) a fuse (b) an input (c) a power source (d) an output
19. 19.✏️ In a circuit diagram, which part is drawn as a circle with an X in it? (a) diode (b) bulb (c) ammeter (d) switch
20. 20.Which of these has no microcontroller inside? (a) a wind-up toy (b) a toy robot (c) a microwave oven (d) a washing machine
21. 21.🔐 Is it a good or a risky habit to post your live location? (a) good habit (b) risky habit
22. 22.🔍 Which is the odd one out? (a) a speaker (b) a turning knob (c) a sound sensor (d) a push button
23. 23.🔋 On a cell, does “usually the black wire” mean the + end or the − end? (a) + (positive) (b) − (negative)
24. 24.🔘 A bulb and a cell are joined through 3 switches one after another in a single loop (series). What is the smallest number of switches that must be ON to light the bulb?
25. 25.Which of these mainly makes sound? (a) a street light (b) a rice cooker (c) an electric toy car (d) a doorbell
26. 26.True or false: “a temperature reading” is the process. (a) False (b) True
27. 27.True or false: “own switch for each bulb” is true of a series circuit. (a) True (b) False
28. 28.🔋 On a cell, does “the shorter symbol line” mean the + end or the − end? (a) + (positive) (b) − (negative)
29. 29.🔍 Which sensor would you use to spot someone walking in? (a) a soil moisture sensor (b) a distance sensor (c) a temperature sensor (d) a motion sensor
30. 30.🌈 A resistor has the colour bands red, yellow, red. What is its value in kilo-ohms (kΩ)? =
31. 31.⏱️ What does “wait 500 ms” do? (a) blinks 500 times (b) pauses for half a second (c) turns the LED off (d) waits 500 seconds
32. 32.✏️ In a circuit diagram, which part is drawn as a straight line? (a) resistor (b) voltmeter (c) wire (d) motor
33. 33.💡 A battery lights 2 identical bulbs joined in series. One more identical bulb is added in series. How do the bulbs glow now? (a) brighter (b) the same (c) dimmer
34. 34.🗺️ In an input → process → output plan, is “decide if soil is dry” the input, the process or the output? (a) output (b) input (c) process
35. 35.True or false: to change default passwords is a good habit. (a) False (b) True
36. 36.🌐 In an IoT system, which part reads values, decides? (a) microcontroller (b) actuator (c) Wi-Fi (d) cloud server
37. 37.True or false: to turn off unused gadgets is a risky habit. (a) False (b) True
38. 38.🌈 A resistor has the colour bands orange, red, brown. What is its value (in ohms)?
39. 39.🔁 count = 3
    while (count < 9) { count = count + 3 }
    How many times does the loop run?
40. 40.🌈 In the resistor colour code, which number does orange stand for?

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