Electronics Worksheet: Final Test

Electronics lesson 30: Final electronics test · Set 765 · 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.📶 Digital or analog: HIGH or LOW only? (a) analog (b) digital
2. 2.💡 4 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. Does bulb 4 glow? (a) Yes (b) No
3. 3.🔺 The voltage stays the same and the resistance gets bigger. The current … (a) stays the same (b) gets bigger (c) gets smaller (d) becomes zero
4. 4.🔋 On a cell, does “the longer symbol line” mean the + end or the − end? (a) − (negative) (b) + (positive)
5. 5.✏️ In a circuit diagram, wires are usually drawn as … (a) little stars (b) dotted circles (c) straight lines (d) wavy lines
6. 6.⏱️ How many milliseconds are in 1 second? (a) 60 (b) 1000 (c) 100 (d) 10
7. 7.⚡ What do we call a flow of electric charge through a wire? (a) electric current (b) sound (c) friction (d) a magnet
8. 8.⚡ A cell changes stored chemical energy into which kind of energy? (a) nuclear energy (b) electrical energy (c) wind energy (d) sound energy
9. 9.🔗 Series or parallel circuit: “a break stops every bulb”? (a) series (b) parallel
10. 10.True or false: to share the Wi-Fi key is a risky habit. (a) False (b) True
11. 11.💡 3 identical bulbs are joined in parallel across a 4.5 V battery (ideal wires). How many volts does each bulb get? =
12. 12.✏️ In a circuit diagram, which part is drawn as one tall, one short bar? (a) capacitor (b) switch (c) cell (d) LED
13. 13.Which of these saves electricity? (a) iron one shirt at a time (b) leave fridge door open (c) run fans in empty rooms (d) switch off empty rooms
14. 14.🔍 Which is the odd one out? (a) a woollen thread (b) a copper wire (c) a safety pin (d) an iron nail
15. 15.🔐 Who should decide which smart devices go in a child’s room? (a) a parent or guardian (b) the app’s adverts (c) nobody at all (d) an online stranger
16. 16.⏱️ repeat 8 times { buzzer ON; wait 400 ms; buzzer OFF; wait 100 ms }
    How many milliseconds does this take in all?
17. 17.🔍 Which is the odd one out? (a) a wind-up clock (b) a plain table fan (c) a battery torch (d) a fitness band with app
18. 18.🔁 total = 0
    for i = 1 to 10 { total = total + i }
    What is total at the end?
19. 19.True or false: “decide if soil is dry” is the process. (a) False (b) True
20. 20.🔁 Is the circuit closed or open if the switch is ON? (a) open (b) closed
21. 21.True or false: a rubber eraser is a conductor. (a) True (b) False
22. 22.⚠️ Is it safe to dry your hands first? (a) not safe (b) safe
23. 23.⚡ Which formula gives electric power? (a) P = V × I (b) P = V + I (c) P = V ÷ I (d) P = I ÷ V
24. 24.🔐 Is it a good or a risky habit to read app permissions? (a) good habit (b) risky habit
25. 25.📏 How many ohms make 1 kilo-ohm (kΩ)? (a) 10 (b) 1000 (c) 100 (d) 1024
26. 26.Which job is done by the reset button? (a) keeps the voltage steady (b) runs the program (c) shows the board is on (d) restarts the program
27. 27.📏 How many ohms (Ω) is 1 kΩ?
28. 28.⚡ A device works on 1.5 V and takes 0.5 A. What is its power (in watts)? =
29. 29.⚠️ Is it safe to use a cable with cuts? (a) not safe (b) safe
30. 30.⏱️ What does “wait 500 ms” do? (a) turns the LED off (b) blinks 500 times (c) waits 500 seconds (d) pauses for half a second
31. 31.True or false: on a cell, “the end with a bump” means the − (negative) end. (a) False (b) True
32. 32.💡 A battery lights 4 identical bulbs joined in series. One more identical bulb is added in series. How do the bulbs glow now? (a) dimmer (b) the same (c) brighter
33. 33.🔗 Series or parallel circuit: “used in house wiring”? (a) parallel (b) series
34. 34.True or false: on an LED, the longer leg is the anode (+). (a) False (b) True
35. 35.🔁 count = 3
    while (count < 15) { count = count + 2 }
    How many times does the loop run?
36. 36.🔍 Which sensor would you use to spot someone walking in? (a) a rain sensor (b) a sound sensor (c) a motion sensor (d) a gas sensor
37. 37.True or false: if the switch is OFF, the circuit is closed and current flows. (a) False (b) True
38. 38.🔁 What does a variable do in a program? (a) joins two wires (b) measures light (c) blinks an LED (d) stores a value
39. 39.🔺 A 10 V supply is joined across a 4 Ω resistor. What current flows (in amperes)? =
40. 40.⏱️ A program says “wait 7750 ms”. How many seconds is that? =

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