Electronics Worksheet: Final Test

Electronics lesson 30: Final electronics test · Set 366 · 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.🔋 On a cell, does “the longer symbol line” mean the + end or the − end? (a) + (positive) (b) − (negative)
2. 2.🔋 6 identical 1.2 V cells are joined in series (+ of one cell to − of the next). What is the total voltage (in volts)? =
3. 3.Which of these is a conductor? (a) a ceramic cup (b) a cotton thread (c) a plastic ruler (d) a brass key
4. 4.⚡ Power tells us … (a) the size of a cell (b) energy used each second (c) the length of a wire (d) the colour of light
5. 5.💡 3 identical bulbs are joined in series with a battery and a closed switch on the main wire. Bulb 2 is taken out of its holder. How many bulbs glow?
6. 6.⚡ Which formula gives electric power? (a) P = V + I (b) P = V ÷ I (c) P = V × I (d) P = I ÷ V
7. 7.💡 On an LED, is the round-side leg the anode (+) or the cathode (−)? (a) cathode (−) (b) anode (+)
8. 8.✏️ Why do engineers draw circuits with symbols? (a) symbols are heavier (b) quick and clear for all (c) to make it colourful (d) to hide the circuit
9. 9.🔌 Which metal is used for most electric wires at home? (a) copper (b) glass (c) plastic (d) rubber
10. 10.🔁 Is the circuit closed or open if the switch is ON? (a) closed (b) open
11. 11.🔁 What does “count = count + 1” do? (a) sets count to 1 (b) adds 1 to count (c) takes 1 away (d) prints 1
12. 12.🔦 A tester circuit has a new cell, a good bulb and wires with a gap between two clips. We put a safety pin across the gap. Does the bulb glow? (a) Yes (b) No
13. 13.🔢 To get a sensor reading onto a phone, which is the FIRST step? (a) the sensor measures (b) the board reads it (c) it is sent by Wi-Fi (d) the cloud stores it
14. 14.🤖 if (temperature > 36) { show “Hot” } else if (temperature > 22) { show “Warm” } else { show “Cool” }
    The temperature is 11 °C. What is shown? (a) Hot (b) Cool (c) Warm
15. 15.🔢 To plan an electronics project, which comes first: “build it with an adult” or “draw the circuit diagram”? (a) build it with an adult (b) draw the circuit diagram
16. 16.🔋 7 identical 1.2 V cells are joined in series (+ of one cell to − of the next). What is the total voltage (in volts)? =
17. 17.True or false: a steel spoon is an insulator. (a) False (b) True
18. 18.🤖 “if (A AND B)” is true when … (a) only B is true (b) both are false (c) both A and B are true (d) only A is true
19. 19.⚡ A device works on 12 V and takes 0.1 A. What is its power (in watts)? =
20. 20.✏️ In a circuit diagram, wires are usually drawn as … (a) dotted circles (b) wavy lines (c) little stars (d) straight lines
21. 21.What does a resistor do? (a) is a resistance knob (b) turns a fan or wheels (c) has coloured bands (d) senses how hot it is
22. 22.✏️ In a circuit diagram, which part is drawn as a dot where wires meet? (a) battery (b) cell (c) switch (d) junction
23. 23.🔁 count = 8
    repeat 8 times { count = count + 2 }
    What is count at the end?
24. 24.🔺 A 25 V supply is joined across a 10 Ω resistor. What current flows (in amperes)? =
25. 25.🔘 Which kind of switch closes when tipped over? (a) a reed switch (b) a slide switch (c) a tilt switch (d) a push button
26. 26.True or false: a toggle switch flips up or down. (a) True (b) False
27. 27.Which of these is true of a parallel circuit? (a) a single current path (b) own switch for each bulb (c) a break stops every bulb (d) bulbs share the voltage
28. 28.⚡ A device works on 6 V and takes 3 A. What is its power (in watts)? =
29. 29.Which of these is the input? (a) the fan starts (b) a button press (c) count button presses (d) check if temp > 30
30. 30.⏱️ How many milliseconds are in 1 second? (a) 10 (b) 100 (c) 60 (d) 1000
31. 31.True or false: a slide switch slides side to side. (a) False (b) True
32. 32.🔁 What does a variable do in a program? (a) stores a value (b) measures light (c) joins two wires (d) blinks an LED
33. 33.⏱️ loop forever { LED ON; wait 250 ms; LED OFF; wait 150 ms }
    How many times does the LED blink in 4 seconds?
34. 34.🔦 A circuit has a used-up (dead) 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 brass key. Does the bulb glow? (a) No (b) Yes
35. 35.🔦 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
36. 36.🔍 Which sensor would you use to water a dry plant? (a) a light sensor (b) a motion sensor (c) a distance sensor (d) a soil moisture sensor
37. 37.💡 A battery lights 5 identical bulbs joined in parallel. One more identical bulb is added in parallel. How do the bulbs glow now? (a) the same (b) brighter (c) dimmer
38. 38.Which of these is a risky habit? (a) cover unused cameras (b) change default passwords (c) log out of shared phones (d) reuse one password
39. 39.🔢 To run one loop of a plant-watering program, which comes first: “compare with the limit” or “wait a few seconds”? (a) wait a few seconds (b) compare with the limit
40. 40.🧩 Which component has coloured bands? (a) diode (b) motor (c) potentiometer (d) resistor

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