Electronics Worksheet: Final Test

Electronics lesson 30: Final electronics test · Set 560 · 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 is the odd one out? (a) accept every permission (b) keep factory passwords (c) share the Wi-Fi key (d) set a strong password
2. 2.🔦 A circuit has a new cell, a good bulb and a switch that is OFF. All the wires are firmly joined. Does the bulb glow? (a) Yes (b) No
3. 3.True or false: to switch off empty rooms wastes electricity. (a) False (b) True
4. 4.🔦 A circuit has a new cell, a good bulb and a switch that is ON. All the wires are firmly joined. A gap in one wire is bridged by a plastic straw. Does the bulb glow? (a) No (b) Yes
5. 5.⚡ A 0.75 W device works on 3 V. What current does it take (in amperes)? =
6. 6.True or false: “own switch for each bulb” is true of a series circuit. (a) False (b) True
7. 7.Which job is done by the main chip? (a) restarts the program (b) connect sensors and LEDs (c) brings power and code (d) runs the program
8. 8.🔺 The voltage stays the same and the resistance gets bigger. The current … (a) gets smaller (b) gets bigger (c) stays the same (d) becomes zero
9. 9.🔐 A smart speaker is always listening for its wake word. What is a sensible habit? (a) let strangers use it (b) mute it when not in use (c) put it in the bathroom (d) tell it your passwords
10. 10.Which of these means the circuit is open? (a) a wire has come loose (b) the loop is complete (c) all wires are joined (d) the switch is ON
11. 11.🌈 In the resistor colour code, which number does black stand for?
12. 12.✏️ In a circuit diagram, wires are usually drawn as … (a) little stars (b) straight lines (c) dotted circles (d) wavy lines
13. 13.🔺 A current of 1 A flows through a 6 Ω resistor. What is the voltage across it (in volts)? =
14. 14.💡 On an LED, is the longer leg the anode (+) or the cathode (−)? (a) cathode (−) (b) anode (+)
15. 15.🔁 x = 1
    repeat 5 times { x = x × 2 }
    What is x at the end?
16. 16.🔢 To run one loop of a plant-watering program, what comes right after “switch the pump on/off”? (a) compare with the limit (b) wait a few seconds (c) read the soil sensor
17. 17.🔺 A current of 2.5 A flows through a 20 Ω resistor. What is the voltage across it (in volts)? =
18. 18.✏️ In a cell symbol, which line is the + terminal? (a) the shorter line (b) neither line (c) the longer line (d) both lines
19. 19.True or false: “many paths for current” is true of a series circuit. (a) False (b) True
20. 20.🔁 total = 0
    for i = 1 to 5 { total = total + i }
    What is total at the end?
21. 21.True or false: to set the AC to 24 °C saves electricity. (a) True (b) False
22. 22.🗺️ In an input → process → output plan, is “a light level reading” the input, the process or the output? (a) output (b) process (c) input
23. 23.🧩 Which part changes electrical energy into sound? (a) a resistor (b) a capacitor (c) a diode (d) a buzzer
24. 24.✏️ In a circuit diagram, which part is drawn as a dot where wires meet? (a) capacitor (b) battery (c) junction (d) ammeter
25. 25.🗺️ Before building a project, what should you write down first? (a) the box colour (b) the final price (c) nothing at all (d) inputs and outputs
26. 26.📏 How many watts (W) is 4.3 kW?
27. 27.🔦 A circuit has a new cell, a good bulb and a switch that is OFF. All the wires are firmly joined. A gap in one wire is bridged by a wooden stick. Does the bulb glow? (a) Yes (b) No
28. 28.🌐 A weather station sends one reading every 5 seconds. How many readings does it send in 7 minutes?
29. 29.Which drawing is the symbol for a voltmeter? (a) a line lifted at a gap (b) a circle with V inside (c) a circle with a cross (d) a small empty box
30. 30.📶 Digital or analog: HIGH or LOW only? (a) analog (b) digital
31. 31.True or false: two or more cell symbols is the symbol for a motor. (a) True (b) False
32. 32.🔺 In the V-I-R triangle, how do we find I? (a) I = V + R (b) I = R ÷ V (c) I = V ÷ R (d) I = V × R
33. 33.📏 How many ohms (Ω) is 7.7 kΩ?
34. 34.📏 Which unit measures energy used each second? (a) volt (V) (b) watt (W) (c) ohm (Ω) (d) ampere (A)
35. 35.True or false: if a wire is cut, the circuit is open and no current flows. (a) True (b) False
36. 36.📏 Voltmeter or ammeter: which one measures voltage? (a) voltmeter (b) ammeter
37. 37.Which of these is true of a parallel circuit? (a) bulbs share the voltage (b) a break stops every bulb (c) own switch for each bulb (d) a single current path
38. 38.📏 In the water-pipe picture of a circuit, current is like … (a) the water pressure (b) the pipe colour (c) the flow of water (d) a narrow pipe
39. 39.Which job needs a light sensor? (a) stop a robot near walls (b) start a fan when hot (c) close a window in rain (d) switch on lamps at dusk
40. 40.🔐 Which is the strongest password for a home smart camera? (a) Tiger#Lamp42!Moon (b) admin (c) password (d) 123456

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