Electronics Worksheet: Final Test

Electronics lesson 30: Final electronics test · Set 464 · 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.💡 What does LED stand for? (a) light-emitting diode (b) low energy device (c) light energy dial (d) large electric dial
2. 2.Which of these means the circuit is open? (a) the loop is complete (b) the switch is ON (c) the switch is OFF (d) all wires are joined
3. 3.🤖 if (temperature > 36) { show “Hot” } else if (temperature > 24) { show “Warm” } else { show “Cool” }
   The temperature is 35 °C. What is shown? (a) Warm (b) Hot (c) Cool
4. 4.🧮 Two resistors in parallel give a total that is … (a) their sum (b) more than either one (c) always zero (d) less than either one
5. 5.Which of these is safe? (a) touch a switch when wet (b) climb an electric pole (c) fly kites in open fields (d) use a cable with cuts
6. 6.Which of these uses electricity? (a) a solar panel (b) a cell (c) a battery (d) a computer
7. 7.🔘 Which kind of switch springs back when let go? (a) a reed switch (b) a toggle switch (c) a push button (d) a slide switch
8. 8.🌈 A gold fourth band on a resistor means the value may be off by … (a) 0 % (b) 25 % (c) 5 % (d) 50 %
9. 9.🔺 A current of 0.1 A flows through a 5 Ω resistor. What is the voltage across it (in volts)? =
10. 10.🔌 Is a plastic straw a conductor or an insulator? (a) a conductor (b) an insulator
11. 11.🔍 Which is the odd one out? (a) the fan starts (b) a soil moisture reading (c) the pump turns on (d) a buzzer beeps
12. 12.⚠️ Is it safe to use small battery cells? (a) safe (b) not safe
13. 13.True or false: a straight line is the symbol for a capacitor. (a) True (b) False
14. 14.🔘 A cell and a bulb are joined to two side-by-side paths: path 1 has switches A and B one after another, path 2 has switch C. A is ON, B is OFF and C is OFF. Does the bulb glow? (a) Yes (b) No
15. 15.🧩 A capacitor in a circuit can … (a) measure heat (b) store charge briefly (c) make light (d) spin a wheel
16. 16.🔺 A current of 0.1 A flows through a 2 Ω resistor. What is the voltage across it (in volts)? =
17. 17.Which of these is the process? (a) a motion sensor signal (b) a soil moisture reading (c) a temperature reading (d) check if temp > 30
18. 18.⚡ Power tells us … (a) the colour of light (b) the size of a cell (c) the length of a wire (d) energy used each second
19. 19.Which of these is an output? (a) a temperature sensor (b) a push button (c) a motor (d) a motion sensor
20. 20.🔁 Is the circuit closed or open if the switch is ON? (a) open (b) closed
21. 21.✏️ In a circuit diagram, which part is drawn as triangle against a bar? (a) bulb (b) diode (c) resistor (d) capacitor
22. 22.Which of these saves electricity? (a) close the fridge quickly (b) leave the TV on standby (c) leave fridge door open (d) iron one shirt at a time
23. 23.💡 In a series circuit, how many paths does the current have? (a) one for each bulb (b) two (c) one (d) none
24. 24.What does a slide switch do? (a) springs back when let go (b) flips up or down (c) closes when tipped over (d) slides side to side
25. 25.💡 In a parallel circuit, one bulb breaks. What happens to the others? (a) they get dimmer (b) they explode (c) they keep glowing (d) they all go out
26. 26.🔍 Which is the odd one out? (a) a Wi-Fi smart plug (b) a wind-up clock (c) an app-controlled bulb (d) a Wi-Fi doorbell camera
27. 27.🔋 On a cell, does “the flat end” mean the + end or the − end? (a) + (positive) (b) − (negative)
28. 28.⚠️ Who should be with you when you build a circuit? (a) a stranger online (b) a trusted adult (c) a younger child (d) nobody
29. 29.🌈 In the resistor colour code, which number does red stand for?
30. 30.True or false: on a cell, “the end with a bump” means the − (negative) end. (a) False (b) True
31. 31.🔺 A current of 0.25 A flows through a 5 Ω resistor. What is the voltage across it (in volts)? =
32. 32.⚡ What does a doorbell mainly change electricity into? (a) sound (b) heat (c) movement (d) light
33. 33.🤖 if (light < 400 AND motion) { porch lamp ON } else { porch lamp OFF }
    The light reading is 480 and motion is not detected (false). What happens? (a) porch lamp OFF (b) porch lamp ON
34. 34.True or false: a plain wall switch has no microcontroller inside. (a) False (b) True
35. 35.🔌 Is a motor an input or an output for a microcontroller? (a) input (b) output
36. 36.🔘 A cell, a bulb and switches A, B, C and D are joined one after another in a single loop (series). A is OFF, B is OFF, C is ON and D is OFF. Does the bulb glow? (a) Yes (b) No
37. 37.⚠️ 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 short circuit (d) a safe circuit
38. 38.🔺 A current of 40 mA flows when 16 V is joined across a resistor. What is its resistance (in ohms)?
39. 39.🌈 A resistor has the colour bands orange, red, yellow. What is its value in kilo-ohms (kΩ)? =
40. 40.🔁 Is the circuit closed or open if all wires are joined? (a) open (b) closed

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