Electronics Worksheet: Final Test

Electronics lesson 30: Final electronics test · Set 109 · 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.🔢 To plan an electronics project, which comes first: “list inputs and outputs” or “test it and fix it”? (a) list inputs and outputs (b) test it and fix it
2. 2.Which of these means the circuit is closed? (a) the loop is complete (b) the switch is OFF (c) the bulb is unscrewed (d) a wire is cut
3. 3.✏️ In a circuit diagram, which part is drawn as two equal parallel lines? (a) wire (b) capacitor (c) resistor (d) LED
4. 4.🧩 Which part changes electrical energy into sound? (a) a diode (b) a capacitor (c) a resistor (d) a buzzer
5. 5.🌐 In an IoT system, which part measures the real world? (a) sensor (b) microcontroller (c) cloud server (d) Wi-Fi
6. 6.True or false: a buzzer beeps for an alarm. (a) True (b) False
7. 7.Which of these is measured in watts (W)? (a) current (b) how much a part resists (c) power (d) voltage
8. 8.🤖 Does a bicycle bell usually have a microcontroller inside? (a) Yes (b) No
9. 9.✏️ Why do engineers draw circuits with symbols? (a) to make it colourful (b) to hide the circuit (c) quick and clear for all (d) symbols are heavier
10. 10.True or false: a circle with A inside is the symbol for an ammeter. (a) False (b) True
11. 11.🔦 A circuit has a new cell, a good bulb and a switch that is OFF. All the wires are firmly joined. A gap in one wire is bridged by an iron nail. Does the bulb glow? (a) No (b) Yes
12. 12.🧩 Which component makes a beeping sound? (a) LDR (b) transistor (c) buzzer (d) capacitor
13. 13.True or false: to set up with a parent is a risky habit. (a) False (b) True
14. 14.🔺 A current of 1 A flows through a 4 Ω resistor. What is the voltage across it (in volts)? =
15. 15.🧮 Adding another resistor in series makes the total resistance … (a) stay the same (b) zero (c) smaller (d) bigger
16. 16.🤖 Microcontroller or laptop: which one runs many apps at once? (a) microcontroller (b) laptop
17. 17.💡 Old festival light strings went fully dark when one bulb failed. How were they joined? (a) not joined (b) in series (c) by Wi-Fi (d) in parallel
18. 18.🔋 A 6 V battery and two 1.5 V cells are joined in series, all facing the same way. What is the total voltage (in volts)? =
19. 19.⚠️ Is it safe to keep drinks far away? (a) safe (b) not safe
20. 20.💡 An LED (with its resistor) is on pin 8. All pins start LOW. The program runs once:
    set pin 7 LOW
    set pin 8 HIGH
    Is the LED ON or OFF at the end? (a) ON (b) OFF
21. 21.🔺 A 5 V supply is joined across a 2 Ω resistor. What current flows (in amperes)? =
22. 22.Which job is done by the voltage regulator? (a) connect sensors and LEDs (b) keeps the voltage steady (c) restarts the program (d) brings power and code
23. 23.🧮 A 100 Ω resistor is joined in series with two equal 330 Ω resistors that are in parallel with each other. What is the total resistance (in ohms)?
24. 24.⏱️ loop forever { LED ON; wait 900 ms; LED OFF; wait 100 ms }
    How many times does the LED blink in 8 seconds?
25. 25.Which of these uses electricity? (a) an air conditioner (b) a power station (c) a solar panel (d) a cell
26. 26.💡 What does LED stand for? (a) light-emitting diode (b) light energy dial (c) large electric dial (d) low energy device
27. 27.🔋 4 identical 1.5 V cells are joined side by side in parallel (all + ends together, all − ends together). What is the voltage across them (in volts)? =
28. 28.🧮 Two equal 10 Ω resistors are joined in parallel. What is the total resistance (in ohms)?
29. 29.🔺 A current of 2 A flows through a 6 Ω resistor. What is the voltage across it (in volts)? =
30. 30.True or false: to iron one shirt at a time saves electricity. (a) True (b) False
31. 31.⚠️ Is it safe to take cells out after use? (a) safe (b) not safe
32. 32.True or false: the voltmeter measures current. (a) False (b) True
33. 33.📏 Voltmeter or ammeter: which one is joined across a part? (a) ammeter (b) voltmeter
34. 34.What does a push button do? (a) flips up or down (b) works only while pressed (c) closes when tipped over (d) stays where you flip it
35. 35.⚠️ A cell gets hot when its + and − ends are joined by a bare wire. What is this called? (a) a parallel circuit (b) an open circuit (c) a safe circuit (d) a short circuit
36. 36.🧩 Which component senses how hot it is? (a) transistor (b) LED (c) thermistor (d) diode
37. 37.🔋 8 identical 1.2 V cells are joined in series (+ of one cell to − of the next). What is the total voltage (in volts)? =
38. 38.🔺 A current of 0.25 A flows when 2.5 V is joined across a resistor. What is its resistance (in ohms)?
39. 39.🔁 What does “count = count + 1” do? (a) takes 1 away (b) prints 1 (c) adds 1 to count (d) sets count to 1
40. 40.Which of these is an IoT device? (a) a battery torch (b) a Wi-Fi weather station (c) a plain table fan (d) a plain wall switch

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