Electronics Worksheet: Final Test

Electronics lesson 30: Final electronics test · Set 117 · 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.📏 Voltmeter or ammeter: which one is joined in series? (a) ammeter (b) voltmeter
2. 2.🔁 x = 5
   repeat 5 times { x = x × 2 }
   What is x at the end?
3. 3.🔺 A 5 V supply is joined across a 2 Ω resistor. What current flows (in amperes)? =
4. 4.True or false: a long and a short line is the symbol for a capacitor. (a) True (b) False
5. 5.📏 Which unit measures resistance? (a) watt (W) (b) ampere (A) (c) ohm (Ω) (d) volt (V)
6. 6.True or false: “used in house wiring” is true of a parallel circuit. (a) True (b) False
7. 7.💡 On an LED, is the leg by the flat edge the anode (+) or the cathode (−)? (a) anode (+) (b) cathode (−)
8. 8.🌈 A gold fourth band on a resistor means the value may be off by … (a) 0 % (b) 25 % (c) 50 % (d) 5 %
9. 9.🔋 Does a generator give electricity or use electricity? (a) uses electricity (b) gives electricity
10. 10.🌈 Which colour bands (1st digit, 2nd digit, multiplier) mark a 6000 Ω resistor? (a) blue-black-orange (b) violet-blue-red (c) blue-black-red (d) blue-black-brown
11. 11.Which drawing is the symbol for a battery? (a) one tall, one short bar (b) a circle with V inside (c) a straight line (d) many long-short pairs
12. 12.🔋 Cells joined + to − in a row (series) give … (a) a smaller voltage (b) no voltage (c) the same voltage (d) a bigger voltage
13. 13.⚠️ Someone is getting a shock and is still touching a wire. What should you do? (a) pour water on them (b) wait and watch (c) shout for an adult (d) pull them by the hand
14. 14.🔺 A current of 50 mA flows through a 330 Ω resistor. What is the voltage across it (in volts)? =
15. 15.⏱️ How many milliseconds are in 1 second? (a) 100 (b) 60 (c) 10 (d) 1000
16. 16.What does an LDR do? (a) glows using little power (b) makes things spin (c) makes a beeping sound (d) senses how bright it is
17. 17.🌈 In the resistor colour code, which number does yellow stand for?
18. 18.🔌 Is a glass marble a conductor or an insulator? (a) an insulator (b) a conductor
19. 19.🔍 Which is the odd one out? (a) change default passwords (b) set a strong password (c) cover unused cameras (d) share the Wi-Fi key
20. 20.Which of these is measured in volts (V)? (a) the flow of charge (b) current (c) voltage (d) how much a part resists
21. 21.🔺 A 4.7 V supply is joined across a 470 Ω resistor. What current flows (in milliamperes, mA)?
22. 22.Which of these has no microcontroller inside? (a) a digital thermometer (b) a smart watch (c) a TV remote (d) a plain wall switch
23. 23.True or false: a tilt switch closes when tipped over. (a) True (b) False
24. 24.🌐 What does IoT stand for? (a) Input of Tools (b) Inside of Toys (c) Internet of Talk (d) Internet of Things
25. 25.🔍 Which is the odd one out? (a) a wind-up clock (b) a pencil sharpener (c) a fitness band with app (d) a plain wall switch
26. 26.True or false: “an alert on the phone” is the output. (a) False (b) True
27. 27.🧮 Resistors of 220 Ω and 220 Ω are joined in series. What is the total resistance (in ohms)?
28. 28.🔍 Which is the odd one out? (a) use old filament bulbs (b) set the AC to 24 °C (c) leave the TV on standby (d) run fans in empty rooms
29. 29.Which of these is true of a series circuit? (a) own switch for each bulb (b) bulbs share the voltage (c) each gets the full volts (d) many paths for current
30. 30.Which of these is a conductor? (a) a paper strip (b) a safety pin (c) a wooden stick (d) a rubber eraser
31. 31.🔁 x = 4
    repeat 5 times { x = x × 2 }
    What is x at the end?
32. 32.💡 2 identical bulbs are joined in series with a battery and a closed switch on the main wire. All the bulbs are in place. Does bulb 2 glow? (a) Yes (b) No
33. 33.True or false: to use LED lamps wastes electricity. (a) True (b) False
34. 34.🧮 Two resistors in parallel give a total that is … (a) less than either one (b) their sum (c) always zero (d) more than either one
35. 35.What does the phone app do? (a) shows data to you (b) reads values, decides (c) carries the data (d) measures the real world
36. 36.🔺 A current of 3 A flows through a 2 Ω resistor. What is the voltage across it (in volts)? =
37. 37.📏 In the water-pipe picture of a circuit, current is like … (a) a narrow pipe (b) the flow of water (c) the water pressure (d) the pipe colour
38. 38.💡 An LED is joined to a 6 V battery through a 470 Ω resistor; its long leg goes to the + side and its short leg to the − side. What happens? (a) lights up (b) may burn out (c) does not light
39. 39.💡 4 identical bulbs are joined in parallel across a 3 V battery (ideal wires). How many volts does each bulb get? =
40. 40.🤖 “if (A AND B)” is true when … (a) both A and B are true (b) only A is true (c) only B is true (d) both are false

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