Electronics Worksheet: Final Test

Electronics lesson 30: Final electronics test · Set 713 · 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.✏️ In a cell symbol, which line is the + terminal? (a) neither line (b) both lines (c) the shorter line (d) the longer line
2. 2.🔌 Most metals are good … (a) insulators (b) batteries (c) conductors (d) magnets only
3. 3.🔍 Which is the odd one out? (a) a traffic signal (b) a street light (c) an LED lamp (d) an electric iron
4. 4.Which drawing is the symbol for a junction? (a) a circle with V inside (b) triangle against a bar (c) a dot where wires meet (d) a circle with M inside
5. 5.🔺 A 4.4 V supply is joined across a 220 Ω resistor. What current flows (in milliamperes, mA)?
6. 6.🔺 A current of 25 mA flows through a 470 Ω resistor. What is the voltage across it (in volts)? =
7. 7.💡 Does it save or waste electricity to leave fridge door open? (a) wastes electricity (b) saves electricity
8. 8.🔘 Which kind of switch slides side to side? (a) a reed switch (b) a push button (c) a slide switch (d) a toggle switch
9. 9.🔺 A 10 V supply is joined across a 4 Ω resistor. What current flows (in amperes)? =
10. 10.🧮 A 22 Ω resistor is joined in series with two equal 470 Ω resistors that are in parallel with each other. What is the total resistance (in ohms)?
11. 11.🧾 A 1500 W appliance runs for 5 hours. How many units (kWh) of electricity does it use? =
12. 12.🔺 A current of 2 A flows when 10 V is joined across a resistor. What is its resistance (in ohms)?
13. 13.🔦 A circuit has a new cell, a good bulb and a switch that is ON. One wire has come loose from the cell. Does the bulb glow? (a) Yes (b) No
14. 14.🔘 Two switches are in parallel (side by side). When does the bulb glow? (a) only when both are ON (b) only when both are OFF (c) when either is ON (d) never
15. 15.💡 In a series circuit, how many paths does the current have? (a) two (b) one (c) one for each bulb (d) none
16. 16.True or false: on a cell, “usually the red wire” means the − (negative) end. (a) True (b) False
17. 17.True or false: “an LED lights up” is the output. (a) False (b) True
18. 18.🔘 When a switch is ON, the circuit is … (a) broken (b) cut (c) open (d) closed
19. 19.🔁 count = 10
    repeat 6 times { count = count + 10 }
    What is count at the end?
20. 20.True or false: a street light mainly makes movement. (a) True (b) False
21. 21.💡 Does it save or waste electricity to switch off empty rooms? (a) wastes electricity (b) saves electricity
22. 22.True or false: how much a part resists is measured in ohms (Ω). (a) False (b) True
23. 23.Which of these mainly gives out heat? (a) a school bell (b) a night lamp (c) a room heater (d) an electric toy car
24. 24.🔍 Which is the odd one out? (a) a light level reading (b) a temperature reading (c) decide if soil is dry (d) a soil moisture reading
25. 25.🔺 A current of 0.1 A flows through an 8 Ω resistor. What is the voltage across it (in volts)? =
26. 26.🔐 A smart-camera app asks for your school name and home address. What should you do? (a) post it online (b) share it with friends (c) type it all in (d) ask a parent first
27. 27.True or false: “an alert on the phone” is the process. (a) True (b) False
28. 28.🔁 In an old-style bulb, which thin wire glows when current flows? (a) the switch (b) the glass (c) the filament (d) the base
29. 29.True or false: to build with an adult near is not safe. (a) False (b) True
30. 30.🔍 Which is the odd one out? (a) a motor (b) a buzzer (c) an LED (d) a sound sensor
31. 31.🌐 What does IoT stand for? (a) Inside of Toys (b) Internet of Things (c) Input of Tools (d) Internet of Talk
32. 32.🧮 Three equal 150 Ω resistors are joined in parallel. What is the total resistance (in ohms)?
33. 33.🔍 Which is the odd one out? (a) aluminium foil (b) a copper wire (c) a brass key (d) a plastic ruler
34. 34.⚡ Which formula gives electric power? (a) P = V ÷ I (b) P = V + I (c) P = V × I (d) P = I ÷ V
35. 35.🔘 Two switches are in series. When does the bulb glow? (a) when both are ON (b) when either is ON (c) when both are OFF (d) never
36. 36.Which job is done by the pins? (a) restarts the program (b) shows the board is on (c) connect sensors and LEDs (d) runs the program
37. 37.True or false: a capacitor stores a little charge. (a) True (b) False
38. 38.🔺 A current of 0.5 A flows through a 15 Ω resistor. What is the voltage across it (in volts)? =
39. 39.🤖 Microcontroller or laptop: which one uses very little power? (a) laptop (b) microcontroller
40. 40.True or false: a resistor is a resistance knob. (a) False (b) True

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