Electronics Worksheet: Final Test

Electronics lesson 30: Final electronics test · Set 908 · 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 drawing is the symbol for an ammeter? (a) a circle with A inside (b) two or more cell symbols (c) a long and a short line (d) one tall, one short bar
2. 2.True or false: a circle with a cross is the symbol for a bulb. (a) False (b) True
3. 3.🔋 On a cell, does “the longer symbol line” mean the + end or the − end? (a) − (negative) (b) + (positive)
4. 4.True or false: to stop if a part gets hot is safe. (a) False (b) True
5. 5.True or false: how much a part resists is measured in ohms (Ω). (a) True (b) False
6. 6.🔁 Is the circuit closed or open if a wire is cut? (a) open (b) closed
7. 7.Which of these is true of a series circuit? (a) used in house wiring (b) one out, the rest glow (c) many paths for current (d) bulbs share the voltage
8. 8.⚙️ Which actuator would you use to show a status light? (a) a servo motor (b) a motor (c) an LED (d) a buzzer
9. 9.Which of these is an insulator? (a) an iron nail (b) aluminium foil (c) a safety pin (d) a dry cork
10. 10.🔘 A bulb and a cell are joined through 6 switches on 6 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?
11. 11.🔘 Which kind of switch stays where you flip it? (a) a reed switch (b) a slide switch (c) a toggle switch (d) a tilt switch
12. 12.💡 What does LED stand for? (a) large electric dial (b) light energy dial (c) light-emitting diode (d) low energy device
13. 13.🔐 Is it a good or a risky habit to change default passwords? (a) good habit (b) risky habit
14. 14.True or false: the flow of charge is measured in amperes (A). (a) False (b) True
15. 15.⚠️ Is it safe to throw cells in a fire? (a) not safe (b) safe
16. 16.Which of these is the process? (a) a temperature reading (b) check if temp > 30 (c) a motion sensor signal (d) a buzzer beeps
17. 17.⏱️ A program says “wait 9250 ms”. How many seconds is that? =
18. 18.🌐 Each reading a sensor sends is 50 bytes. How many bytes do 160 readings take?
19. 19.🔍 Which is the odd one out? (a) a plain table fan (b) a plain wall switch (c) a paper calendar (d) an app-controlled bulb
20. 20.True or false: an LDR senses how bright it is. (a) False (b) True
21. 21.Which of these is an IoT device? (a) a battery torch (b) a wind-up clock (c) a Wi-Fi smart plug (d) a plain wall switch
22. 22.True or false: “own switch for each bulb” is true of a series circuit. (a) True (b) False
23. 23.🧩 Which component stores a little charge? (a) resistor (b) motor (c) thermistor (d) capacitor
24. 24.What does a motor do? (a) limits the current (b) makes a beeping sound (c) is a resistance knob (d) makes things spin
25. 25.🔍 Which sensor would you use to close a window in rain? (a) a motion sensor (b) a light sensor (c) a temperature sensor (d) a rain sensor
26. 26.🔍 Which is the odd one out? (a) use a cable with cuts (b) dry your hands first (c) use mains for a project (d) climb an electric pole
27. 27.💡 5 identical bulbs are joined in parallel across a 3 V battery (ideal wires). How many volts does each bulb get? =
28. 28.🔺 A 5 V supply is joined across a 500 Ω resistor. What current flows (in milliamperes, mA)?
29. 29.True or false: a dry cork is an insulator. (a) False (b) True
30. 30.📏 How many kilowatts (kW) is 1750 W? =
31. 31.📏 Which unit measures power? (a) volt (V) (b) ohm (Ω) (c) ampere (A) (d) watt (W)
32. 32.🌐 A soil sensor sends a reading to an app every 5 minutes. How many readings arrive in 2 hours?
33. 33.🔦 A tester circuit has a new cell, a good bulb and wires with a gap between two clips. We put a plastic straw across the gap. Does the bulb glow? (a) No (b) Yes
34. 34.💡 5 identical bulbs are joined in series with a battery and a closed switch on the main wire. All the bulbs are in place. Does bulb 2 glow? (a) Yes (b) No
35. 35.Which of these mainly makes movement? (a) a toaster (b) a torch (c) an exhaust fan (d) a street light
36. 36.📏 In the water-pipe picture of a circuit, current is like … (a) the pipe colour (b) the flow of water (c) the water pressure (d) a narrow pipe
37. 37.💡 A battery lights 3 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.⚠️ Is it safe to climb an electric pole? (a) safe (b) not safe
39. 39.True or false: a steel spoon is an insulator. (a) True (b) False
40. 40.⚡ Power tells us … (a) the length of a wire (b) the colour of light (c) the size of a cell (d) energy used each second

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