Electronics Worksheet: Final Test

Electronics lesson 30: Final electronics test · Set 652 · 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 saves electricity? (a) use old filament bulbs (b) leave the TV on standby (c) leave fridge door open (d) set the AC to 24 °C
2. 2.🤖 In “if (temp > 30)”, what runs when temp is exactly 30? (a) the if part (b) the else part (c) both parts (d) neither part
3. 3.Which drawing is the symbol for a resistor? (a) a circle with a cross (b) a straight line (c) a small empty box (d) a circle with A inside
4. 4.⚡ A 2.25 W device works on 9 V. What current does it take (in amperes)? =
5. 5.Which of these is measured in volts (V)? (a) energy used each second (b) resistance (c) how much a part resists (d) voltage
6. 6.🤖 if (temperature > 38) { show “Hot” } else if (temperature > 23) { show “Warm” } else { show “Cool” }
   The temperature is 27 °C. What is shown? (a) Warm (b) Cool (c) Hot
7. 7.Which of these is a conductor? (a) a glass marble (b) a wooden stick (c) a steel coin (d) a paper strip
8. 8.🗺️ Before building a project, what should you write down first? (a) the box colour (b) inputs and outputs (c) the final price (d) nothing at all
9. 9.💡 On an LED, is the shorter leg the anode (+) or the cathode (−)? (a) anode (+) (b) cathode (−)
10. 10.🔋 A 6 V battery and three 1.5 V cells are joined in series, all facing the same way. What is the total voltage (in volts)? =
11. 11.🔗 Series or parallel circuit: “one bulb out, all go out”? (a) series (b) parallel
12. 12.📏 Voltmeter or ammeter: which one is joined in series? (a) voltmeter (b) ammeter
13. 13.⚡ A 2.5 W device works on 5 V. What current does it take (in amperes)? =
14. 14.🔺 A 12 V supply is joined across a 12 Ω resistor. What current flows (in amperes)? =
15. 15.True or false: on a cell, “the flat end” means the − (negative) end. (a) False (b) True
16. 16.🗺️ In an input → process → output plan, is “the fan starts” the input, the process or the output? (a) output (b) process (c) input
17. 17.🤖 if (temperature > 33) { show “Hot” } else if (temperature > 19) { show “Warm” } else { show “Cool” }
    The temperature is 12 °C. What is shown? (a) Hot (b) Cool (c) Warm
18. 18.✏️ In a circuit diagram, which part is drawn as a plain rectangle? (a) junction (b) ammeter (c) resistor (d) LED
19. 19.🔺 A current of 0.1 A flows through a 20 Ω resistor. What is the voltage across it (in volts)? =
20. 20.🌈 A resistor has the colour bands violet, black, orange. What is its value in kilo-ohms (kΩ)? =
21. 21.🔍 Which is the odd one out? (a) share only needed data (b) reuse one password (c) change default passwords (d) turn off unused gadgets
22. 22.🔢 To get a sensor reading onto a phone, which is the FIRST step? (a) the cloud stores it (b) it is sent by Wi-Fi (c) the sensor measures (d) the board reads it
23. 23.True or false: “a single current path” is true of a parallel circuit. (a) True (b) False
24. 24.True or false: “own switch for each bulb” is true of a parallel circuit. (a) True (b) False
25. 25.🔐 Privacy for a smart device means controlling … (a) who can see your data (b) how loud it beeps (c) its battery size (d) its colour
26. 26.Which drawing is the symbol for a battery? (a) triangle against a bar (b) many long-short pairs (c) one tall, one short bar (d) a line lifted at a gap
27. 27.🧩 Which component has coloured bands? (a) transistor (b) resistor (c) motor (d) buzzer
28. 28.What does a tilt switch do? (a) slides side to side (b) flips up or down (c) closes when tipped over (d) works only while pressed
29. 29.⏱️ How many milliseconds are in 1 second? (a) 100 (b) 60 (c) 1000 (d) 10
30. 30.💡 Why is house wiring done in parallel? (a) so all go off together (b) to save copper only (c) to make bulbs dim (d) each gets full voltage
31. 31.🔋 Cells joined + to − in a row (series) give … (a) the same voltage (b) no voltage (c) a bigger voltage (d) a smaller voltage
32. 32.🔍 Which sensor would you use to open blinds at sunrise? (a) a gas sensor (b) a light sensor (c) a motion sensor (d) a temperature sensor
33. 33.🔍 Which is the odd one out? (a) build with an adult near (b) take cells out after use (c) climb an electric pole (d) stop if a part gets hot
34. 34.True or false: triangle against a bar is the symbol for a diode. (a) False (b) True
35. 35.🔘 A bulb and a cell are joined through 4 switches on 4 side-by-side paths, one switch on each path (parallel). What is the smallest number of switches that must be ON to light the bulb?
36. 36.💡 Does it save or waste electricity to use LED lamps? (a) saves electricity (b) wastes electricity
37. 37.💡 4 identical bulbs are in parallel and each one takes 0.5 A. What total current (in amperes) comes from the battery? =
38. 38.🌈 Which colour bands (1st digit, 2nd digit, multiplier) mark a 6100 Ω resistor? (a) blue-brown-orange (b) blue-brown-red (c) blue-brown-brown (d) brown-blue-red
39. 39.True or false: to set up with a parent is a good habit. (a) False (b) True
40. 40.Which job needs a motor? (a) show the temperature (b) spin a robot’s wheels (c) open a gate to 90° (d) move water to plants

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