Electronics Worksheet: Final Test

Electronics lesson 30: Final electronics test · Set 603 · 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 current of 50 mA flows through a 100 Ω resistor. What is the voltage across it (in volts)? =
2. 2.🔌 Which part of a screwdriver should an electrician hold? (a) the metal tip (b) the plastic handle (c) the bare end (d) the steel shaft
3. 3.⚡ A home appliance on the 230 V mains takes 1 A. What is its power (in watts)?
4. 4.🤖 In “if (temp > 30)”, what runs when temp is exactly 30? (a) both parts (b) the else part (c) the if part (d) neither part
5. 5.Which of these is true of a series circuit? (a) bulbs share the voltage (b) many paths for current (c) one out, the rest glow (d) own switch for each bulb
6. 6.🌈 Which colour bands (1st digit, 2nd digit, multiplier) mark a 110 Ω resistor? (a) brown-red-brown (b) brown-brown-red (c) brown-brown-black (d) brown-brown-brown
7. 7.🔘 Which kind of switch closes when tipped over? (a) a tilt switch (b) a toggle switch (c) a reed switch (d) a push button
8. 8.🔍 Which is the odd one out? (a) stop if a part gets hot (b) throw cells in a fire (c) use a cable with cuts (d) poke things in a socket
9. 9.🤖 Microcontroller or laptop: which one runs one small program? (a) laptop (b) microcontroller
10. 10.🔢 To plan an electronics project, which is the FIRST step? (a) test it and fix it (b) list inputs and outputs (c) draw the circuit diagram (d) pick a problem to solve
11. 11.🔍 Which sensor would you use to open blinds at sunrise? (a) a light sensor (b) a sound sensor (c) a temperature sensor (d) a distance sensor
12. 12.📏 How many kilowatts (kW) is 400 W? =
13. 13.Which of these means the circuit is closed? (a) all wires are joined (b) a wire has come loose (c) a wire is cut (d) the switch is OFF
14. 14.🔁 Is the circuit closed or open if a wire is cut? (a) closed (b) open
15. 15.True or false: “a break stops every bulb” is true of a parallel circuit. (a) False (b) True
16. 16.🔍 Which is the odd one out? (a) a copper wire (b) aluminium foil (c) a brass key (d) a dry cork
17. 17.🔌 Is a water pump an input or an output for a microcontroller? (a) output (b) input
18. 18.Which of these is the input? (a) the fan starts (b) a motion sensor signal (c) an LED lights up (d) decide if soil is dry
19. 19.⏱️ How many milliseconds is a wait of 0.6 seconds?
20. 20.True or false: on an LED, the shorter leg is the cathode (−). (a) False (b) True
21. 21.True or false: to share the Wi-Fi key is a risky habit. (a) False (b) True
22. 22.🔋 How many 3 V cells must be joined in series to give 9 V?
23. 23.🔋 Does a battery give electricity or use electricity? (a) gives electricity (b) uses electricity
24. 24.🧮 Two equal 100 Ω resistors are joined in parallel. What is the total resistance (in ohms)?
25. 25.🔍 An object is 17 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
26. 26.Which of these is an insulator? (a) a steel coin (b) a ceramic cup (c) a graphite rod (d) an iron nail
27. 27.True or false: a table fan mainly makes movement. (a) False (b) True
28. 28.📏 Which unit measures energy used each second? (a) watt (W) (b) ohm (Ω) (c) volt (V) (d) ampere (A)
29. 29.🔐 A smart-camera app asks for your school name and home address. What should you do? (a) share it with friends (b) ask a parent first (c) post it online (d) type it all in
30. 30.🤖 if (temperature > 37) { show “Hot” } else if (temperature > 18) { show “Warm” } else { show “Cool” }
    The temperature is 31 °C. What is shown? (a) Cool (b) Warm (c) Hot
31. 31.🌐 A weather station sends one reading every 60 seconds. How many readings does it send in 3 minutes?
32. 32.🔋 On a cell, does “usually the red wire” mean the + end or the − end? (a) − (negative) (b) + (positive)
33. 33.🧮 Two equal 20 Ω resistors are joined in parallel. What is the total resistance (in ohms)?
34. 34.True or false: a microwave oven has no microcontroller inside. (a) True (b) False
35. 35.💡 6 identical bulbs are joined in series with a battery and a closed switch on the main wire. Bulb 6 is taken out of its holder. How many bulbs glow?
36. 36.What does a push button do? (a) closes when tipped over (b) springs back when let go (c) slides side to side (d) flips up or down
37. 37.Which of these is a conductor? (a) a dry cork (b) a metal paper clip (c) a glass marble (d) a rubber eraser
38. 38.✏️ In a circuit diagram, which part is drawn as many long-short pairs? (a) capacitor (b) ammeter (c) motor (d) battery
39. 39.💡 Does it save or waste electricity to set the AC to 24 °C? (a) saves electricity (b) wastes electricity
40. 40.💡 On an LED, is the leg by the flat edge the anode (+) or the cathode (−)? (a) cathode (−) (b) anode (+)

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