Electronics Worksheet: Final Test

Electronics lesson 30: Final electronics test · Set 152 · 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: current is measured in amperes (A). (a) True (b) False
2. 2.🔘 Switch A is on the main wire next to the cell and the bulb; then the wire splits into two side-by-side paths, one with switch B and one with switch C. A is ON, B is ON and C is OFF. Does the bulb glow? (a) No (b) Yes
3. 3.💡 An LED (with its resistor) is on pin 7. All pins start LOW. The program runs once:
   set pin 7 LOW
   set pin 7 LOW
   set pin 7 HIGH
   set pin 7 HIGH
   Is the LED ON or OFF at the end? (a) ON (b) OFF
4. 4.🤖 if (sound > 60) { red LED ON } else { green LED ON }
   The sound sensor reads 77. What happens? (a) green LED ON (b) red LED ON
5. 5.🔺 A current of 0.5 A flows through a 15 Ω resistor. What is the voltage across it (in volts)? =
6. 6.💡 Old festival light strings went fully dark when one bulb failed. How were they joined? (a) in series (b) in parallel (c) not joined (d) by Wi-Fi
7. 7.Which of these saves electricity? (a) leave the TV on standby (b) close the fridge quickly (c) iron one shirt at a time (d) leave fridge door open
8. 8.True or false: on a cell, “usually the red wire” means the + (positive) end. (a) False (b) True
9. 9.🔺 A current of 1.5 A flows through a 12 Ω resistor. What is the voltage across it (in volts)? =
10. 10.🧩 A capacitor in a circuit can … (a) make light (b) spin a wheel (c) store charge briefly (d) measure heat
11. 11.True or false: to fly kites in open fields is not safe. (a) True (b) False
12. 12.🔘 A bulb and a cell are joined through 6 switches one after another in a single loop (series). What is the smallest number of switches that must be ON to light the bulb?
13. 13.True or false: if the loop is complete, the circuit is open and no current flows. (a) True (b) False
14. 14.🔺 A current of 50 mA flows through a 470 Ω resistor. What is the voltage across it (in volts)? =
15. 15.⚡ Which formula gives electric power? (a) P = I ÷ V (b) P = V × I (c) P = V + I (d) P = V ÷ I
16. 16.True or false: a circle with A inside is the symbol for an ammeter. (a) False (b) True
17. 17.🔺 A current of 50 mA flows through a 330 Ω resistor. What is the voltage across it (in volts)? =
18. 18.⏱️ loop forever { LED ON; wait 250 ms; LED OFF; wait 150 ms }
    How many times does the LED blink in 12 seconds?
19. 19.🔋 On a cell, does “the longer symbol line” mean the + end or the − end? (a) + (positive) (b) − (negative)
20. 20.🔘 A cell, a bulb and switches A and B are joined one after another in a single loop (series). A is OFF and B is ON. Does the bulb glow? (a) Yes (b) No
21. 21.🗺️ Before building a project, what should you write down first? (a) the box colour (b) inputs and outputs (c) the final price (d) nothing at all
22. 22.🔗 Series or parallel circuit: “a break stops every bulb”? (a) series (b) parallel
23. 23.🔐 Is it a good or a risky habit to share only needed data? (a) good habit (b) risky habit
24. 24.Which drawing is the symbol for a junction? (a) a dot where wires meet (b) one tall, one short bar (c) a long and a short line (d) many long-short pairs
25. 25.🔦 A circuit has a new cell, a good bulb and a switch that is ON. All the wires are firmly joined. Does the bulb glow? (a) No (b) Yes
26. 26.True or false: the voltmeter is joined in series. (a) False (b) True
27. 27.Which drawing is the symbol for a cell? (a) a long and a short line (b) a dot where wires meet (c) a straight line (d) a circle with a cross
28. 28.True or false: how much a part resists is measured in amperes (A). (a) False (b) True
29. 29.🔍 Which is the odd one out? (a) throw cells in a fire (b) take cells out after use (c) keep drinks far away (d) dry your hands first
30. 30.🔺 A current of 50 mA flows through a 300 Ω resistor. What is the voltage across it (in volts)? =
31. 31.Which of these is the process? (a) a temperature reading (b) decide if soil is dry (c) a button press (d) a soil moisture reading
32. 32.✏️ In a circuit diagram, which part is drawn as a plain rectangle? (a) diode (b) resistor (c) ammeter (d) junction
33. 33.🔺 A 5 V supply is joined across a 100 Ω resistor. What current flows (in milliamperes, mA)?
34. 34.⚡ Power tells us … (a) the length of a wire (b) energy used each second (c) the size of a cell (d) the colour of light
35. 35.🔘 A cell, a bulb and switches A and B are joined one after another in a single loop (series). A is ON and B is OFF. Does the bulb glow? (a) No (b) Yes
36. 36.🧮 A 470 Ω resistor is joined in series with two equal 40 Ω resistors that are in parallel with each other. What is the total resistance (in ohms)?
37. 37.🧮 Three equal 15 Ω resistors are joined in parallel. What is the total resistance (in ohms)?
38. 38.🔺 A current of 10 mA flows when 1.2 V is joined across a resistor. What is its resistance (in ohms)?
39. 39.Which of these has no microcontroller inside? (a) a digital thermometer (b) a TV remote (c) a candle (d) a smart watch
40. 40.🔺 A current of 10 mA flows when 2 V is joined across a resistor. What is its resistance (in ohms)?

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