Electronics Worksheet: Final Test

Electronics lesson 30: Final electronics test · Set 542 · 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.🔐 Is it a good or a risky habit to share only needed data? (a) good habit (b) risky habit
2. 2.🧮 Adding another resistor in series makes the total resistance … (a) zero (b) stay the same (c) smaller (d) bigger
3. 3.🌈 A resistor has the colour bands grey, red, yellow. What is its value in kilo-ohms (kΩ)? =
4. 4.Which of these means the circuit is closed? (a) a wire has come loose (b) the switch is OFF (c) the loop is complete (d) a wire is cut
5. 5.⏱️ A program says “wait 8750 ms”. How many seconds is that? =
6. 6.🤖 if (temperature > 30) { fan ON } else { fan OFF }
   The temperature sensor reads 33 °C. What happens? (a) fan ON (b) fan OFF
7. 7.⏱️ loop forever { LED ON; wait 300 ms; LED OFF; wait 950 ms }
   How many milliseconds does one blink (ON + OFF) take?
8. 8.⚡ Power tells us … (a) the colour of light (b) the size of a cell (c) energy used each second (d) the length of a wire
9. 9.⚠️ Is it safe to use small battery cells? (a) not safe (b) safe
10. 10.✏️ In a circuit diagram, which part is drawn as a straight line? (a) wire (b) cell (c) battery (d) junction
11. 11.🔁 count = 4
    while (count < 8) { count = count + 2 }
    How many times does the loop run?
12. 12.True or false: “a single current path” is true of a series circuit. (a) False (b) True
13. 13.True or false: “the fan starts” is the input. (a) True (b) False
14. 14.🔌 Is a safety pin a conductor or an insulator? (a) an insulator (b) a conductor
15. 15.⚡ A 12 W device works on 6 V. What current does it take (in amperes)? =
16. 16.True or false: to iron one shirt at a time saves electricity. (a) False (b) True
17. 17.Which of these saves electricity? (a) iron one shirt at a time (b) leave fridge door open (c) use daylight to read (d) use old filament bulbs
18. 18.🔦 A tester circuit has a new cell, a good bulb and wires with a gap between two clips. We put a plastic ruler across the gap. Does the bulb glow? (a) Yes (b) No
19. 19.⏱️ How many milliseconds is a wait of 1.5 seconds?
20. 20.True or false: an LED lamp mainly gives out light. (a) True (b) False
21. 21.⚡ A cell changes stored chemical energy into which kind of energy? (a) electrical energy (b) sound energy (c) nuclear energy (d) wind energy
22. 22.🧮 Resistors of 150 Ω, 330 Ω and 20 Ω are joined in series. What is the total resistance (in ohms)?
23. 23.🔌 Is a servo motor an input or an output for a microcontroller? (a) input (b) output
24. 24.Which of these is true of a series circuit? (a) bulbs share the voltage (b) many paths for current (c) used in house wiring (d) each gets the full volts
25. 25.🔐 Is it a good or a risky habit to cover unused cameras? (a) risky habit (b) good habit
26. 26.💡 In a series circuit, how many paths does the current have? (a) one for each bulb (b) two (c) none (d) one
27. 27.⏱️ How many milliseconds is a wait of 0.9 seconds?
28. 28.Which of these uses electricity? (a) a bicycle dynamo (b) a mobile phone (c) a solar panel (d) a power station
29. 29.⏱️ How many milliseconds are in 1 second? (a) 10 (b) 60 (c) 1000 (d) 100
30. 30.🔁 count = 2
    repeat 9 times { count = count + 3 }
    What is count at the end?
31. 31.🗺️ In an input → process → output plan, is “a soil moisture reading” the input, the process or the output? (a) input (b) output (c) process
32. 32.True or false: if the switch is ON, the circuit is open and no current flows. (a) False (b) True
33. 33.🔍 Which is the odd one out? (a) a safety pin (b) a cotton thread (c) a ceramic cup (d) a glass marble
34. 34.💡 On an LED, is the shorter leg the anode (+) or the cathode (−)? (a) cathode (−) (b) anode (+)
35. 35.🔍 Which is the odd one out? (a) use mains for a project (b) open a phone charger (c) use small battery cells (d) fly a kite near wires
36. 36.What does a push button do? (a) springs back when let go (b) stays where you flip it (c) closes near a magnet (d) flips up or down
37. 37.💡 On an LED, is the longer leg the anode (+) or the cathode (−)? (a) anode (+) (b) cathode (−)
38. 38.🤖 Where does the board keep its program when the power is off? (a) the resistor (b) the power LED (c) flash memory (d) the USB cable
39. 39.⚠️ Why must we never touch switches with wet hands? (a) it is just untidy (b) it spoils the paint (c) water makes it cold (d) water carries current
40. 40.📏 How many amperes (A) is 950 mA? =

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