Electronics Worksheet: Final Test

Electronics lesson 30: Final electronics test · Set 541 · 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) a paper strip (b) a glass marble (c) a steel coin (d) a rubber band
2. 2.🔁 What must there be for a current to flow? (a) one loose end (b) a complete loop (c) a broken path (d) a plastic gap
3. 3.⏱️ repeat 10 times { buzzer ON; wait 600 ms; buzzer OFF; wait 300 ms }
   How many milliseconds does this take in all?
4. 4.⚡ A device works on 12 V and takes 0.2 A. What is its power (in watts)? =
5. 5.📏 Which unit measures energy used each second? (a) watt (W) (b) volt (V) (c) ampere (A) (d) ohm (Ω)
6. 6.🔺 A 1 V supply is joined across a 4 Ω resistor. What current flows (in amperes)? =
7. 7.🔋 Does a refrigerator give electricity or use electricity? (a) gives electricity (b) uses electricity
8. 8.⚡ A solar panel changes which kind of energy into electricity? (a) chemical energy (b) light energy (c) wind energy (d) sound energy
9. 9.True or false: to fly kites in open fields is not safe. (a) True (b) False
10. 10.🔐 Is it a good or a risky habit to post your live location? (a) risky habit (b) good habit
11. 11.Which of these mainly gives out light? (a) an LED lamp (b) a room heater (c) a rice cooker (d) a buzzer
12. 12.🌈 Which band is read first on a resistor? (a) any band (b) the widest gap (c) the gold band (d) the one nearest an end
13. 13.✏️ Why do engineers draw circuits with symbols? (a) quick and clear for all (b) symbols are heavier (c) to hide the circuit (d) to make it colourful
14. 14.Which of these is an insulator? (a) a safety pin (b) an iron nail (c) a plastic ruler (d) a copper wire
15. 15.🔺 A 7.5 V supply is joined across a 15 Ω resistor. What current flows (in amperes)? =
16. 16.Which of these is true of a series circuit? (a) used in house wiring (b) bulbs share the voltage (c) own switch for each bulb (d) many paths for current
17. 17.🔁 count = 4
    while (count < 16) { count = count + 4 }
    How many times does the loop run?
18. 18.🧮 A 4.5 V battery is joined to 10 Ω and 8 Ω resistors in series. What current flows (in amperes)? =
19. 19.⏱️ repeat 7 times { buzzer ON; wait 500 ms; buzzer OFF; wait 700 ms }
    How many milliseconds does this take in all?
20. 20.🔍 Which is the odd one out? (a) a fitness band with app (b) a plain table fan (c) a battery torch (d) a paper calendar
21. 21.True or false: an LED glows using little power. (a) False (b) True
22. 22.🔢 To plan an electronics project, which is the LAST step? (a) draw the circuit diagram (b) pick a problem to solve (c) build it with an adult (d) test it and fix it
23. 23.⚡ What does an exhaust fan mainly change electricity into? (a) light (b) movement (c) heat (d) sound
24. 24.⚙️ What is an actuator? (a) a sensor (b) an output that acts (c) a battery (d) a program
25. 25.True or false: “one bulb out, all go out” is true of a parallel circuit. (a) False (b) True
26. 26.True or false: on a cell, “usually the black wire” means the + (positive) end. (a) False (b) True
27. 27.🔺 A current of 0.2 A flows when 2 V is joined across a resistor. What is its resistance (in ohms)?
28. 28.⚡ A device works on 24 V and takes 0.1 A. What is its power (in watts)? =
29. 29.True or false: an LDR has coloured bands. (a) True (b) False
30. 30.🔋 What is a battery? (a) one single wire (b) two or more cells joined (c) a kind of bulb (d) a switch with a lid
31. 31.True or false: a reed switch closes when tipped over. (a) True (b) False
32. 32.🧮 Five equal 500 Ω resistors are joined in parallel. What is the total resistance (in ohms)?
33. 33.⚡ Which formula gives electric power? (a) P = V × I (b) P = V + I (c) P = I ÷ V (d) P = V ÷ I
34. 34.🔐 Is it a good or a risky habit to share only needed data? (a) good habit (b) risky habit
35. 35.🌈 A resistor has the colour bands yellow, orange, yellow. What is its value in kilo-ohms (kΩ)? =
36. 36.🔺 A current of 0.5 A flows when 7.5 V is joined across a resistor. What is its resistance (in ohms)?
37. 37.⚡ What does a table fan mainly change electricity into? (a) light (b) sound (c) heat (d) movement
38. 38.🔌 Is a graphite rod a conductor or an insulator? (a) a conductor (b) an insulator
39. 39.What does a transistor do? (a) makes things spin (b) boosts a small signal (c) blows if current is high (d) is a resistance knob
40. 40.📏 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

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