Electronics Worksheet: Final Test

Electronics lesson 30: Final electronics test · Set 958 · 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.True or false: a digital thermometer has no microcontroller inside. (a) True (b) False
2. 2.📏 How many kilowatts (kW) is 1400 W? =
3. 3.⚡ What does an LED lamp mainly change electricity into? (a) sound (b) light (c) movement (d) heat
4. 4.💡 Old festival light strings went fully dark when one bulb failed. How were they joined? (a) not joined (b) in parallel (c) by Wi-Fi (d) in series
5. 5.Which of these is an output? (a) a keypad (b) a push button (c) a small display (d) a turning knob
6. 6.Which job needs a buzzer? (a) spin a robot’s wheels (b) beep an alarm (c) turn to an exact angle (d) show the temperature
7. 7.🔍 Which is the odd one out? (a) a woollen thread (b) a rubber eraser (c) a wooden stick (d) aluminium foil
8. 8.⚡ A device works on 9 V and takes 0.1 A. What is its power (in watts)? =
9. 9.🔋 A 3 V battery and one 1.5 V cell are joined in series, all facing the same way. What is the total voltage (in volts)? =
10. 10.🔗 Series or parallel circuit: “bulbs share the voltage”? (a) series (b) parallel
11. 11.🔘 A bulb and a cell are joined through 2 switches on 2 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?
12. 12.True or false: “a break stops every bulb” is true of a parallel circuit. (a) True (b) False
13. 13.True or false: to switch off empty rooms wastes electricity. (a) True (b) False
14. 14.🔺 A current of 40 mA flows through a 150 Ω resistor. What is the voltage across it (in volts)? =
15. 15.🔁 Is the circuit closed or open if the loop is complete? (a) open (b) closed
16. 16.⏱️ How many milliseconds are in 1 second? (a) 60 (b) 10 (c) 100 (d) 1000
17. 17.🔍 Which is the odd one out? (a) an iron nail (b) a copper wire (c) a wooden stick (d) a graphite rod
18. 18.Which of these is a risky habit? (a) accept every permission (b) share only needed data (c) cover unused cameras (d) log out of shared phones
19. 19.True or false: to iron one shirt at a time saves electricity. (a) True (b) False
20. 20.⚡ A device works on 12 V and takes 0.25 A. What is its power (in watts)? =
21. 21.⏱️ How many milliseconds is a wait of 2.5 seconds?
22. 22.🔘 When a switch is ON, the circuit is … (a) open (b) cut (c) closed (d) broken
23. 23.🔗 Series or parallel circuit: “one bulb out, all go out”? (a) parallel (b) series
24. 24.🔁 count = 0
    while (count < 10) { count = count + 5 }
    How many times does the loop run?
25. 25.🧾 A 2000 W appliance runs for 2 hours. How many units (kWh) of electricity does it use? =
26. 26.⚡ A solar panel changes which kind of energy into electricity? (a) sound energy (b) light energy (c) wind energy (d) chemical energy
27. 27.⚡ A home appliance on the 230 V mains takes 2 A. What is its power (in watts)?
28. 28.🤖 Does a candle usually have a microcontroller inside? (a) No (b) Yes
29. 29.🔍 Which is the odd one out? (a) fly kites in open fields (b) dry your hands first (c) stay away from pylons (d) poke things in a socket
30. 30.✏️ In a circuit diagram, which part is drawn as a circle with a cross? (a) switch (b) wire (c) bulb (d) resistor
31. 31.🔋 How many 1.2 V cells must be joined in series to give 7.2 V?
32. 32.💡 Why does an LED need a resistor in series? (a) to make it brighter (b) to store charge (c) to limit the current (d) to change its colour
33. 33.📶 Digital or analog: a button: pressed or not? (a) digital (b) analog
34. 34.🧩 Which component has coloured bands? (a) resistor (b) motor (c) diode (d) buzzer
35. 35.True or false: to spot someone walking in, use a motion sensor. (a) False (b) True
36. 36.🔌 Is a wooden stick a conductor or an insulator? (a) an insulator (b) a conductor
37. 37.💡 Why is house wiring done in parallel? (a) to save copper only (b) each gets full voltage (c) so all go off together (d) to make bulbs dim
38. 38.🔍 Which is the odd one out? (a) use old filament bulbs (b) set the AC to 24 °C (c) use LED lamps (d) unplug idle chargers
39. 39.✏️ In a circuit diagram, which part is drawn as a long and a short line? (a) resistor (b) motor (c) cell (d) switch
40. 40.True or false: a tilt switch springs back when let go. (a) False (b) True

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