Electronics Worksheet: Final Test

Electronics lesson 30: Final electronics test · Set 965 · 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.🔁 Is the circuit closed or open if the switch is ON? (a) open (b) closed
2. 2.🔘 A bulb and a cell are joined through 5 switches on 5 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?
3. 3.⏱️ loop forever { LED ON; wait 650 ms; LED OFF; wait 100 ms }
   How many milliseconds does one blink (ON + OFF) take?
4. 4.🌈 A resistor has the colour bands green, orange, red. What is its value (in ohms)?
5. 5.📶 A pin set LOW gives about … (a) 9 V (b) 1.5 V (c) 0 V (d) 5 V
6. 6.⚡ Power tells us … (a) energy used each second (b) the size of a cell (c) the colour of light (d) the length of a wire
7. 7.Which drawing is the symbol for an LED? (a) one tall, one short bar (b) triangle, bar and arrows (c) two equal parallel lines (d) a circle with A inside
8. 8.🧮 Two equal 330 Ω resistors are joined in parallel. What is the total resistance (in ohms)?
9. 9.🧮 Two equal 1000 Ω resistors are joined in parallel. What is the total resistance (in ohms)?
10. 10.🔍 Which is the odd one out? (a) an LED (b) a temperature sensor (c) a sound sensor (d) a push button
11. 11.⏱️ How many milliseconds are in 1 second? (a) 1000 (b) 100 (c) 60 (d) 10
12. 12.⏱️ loop forever { LED ON; wait 300 ms; LED OFF; wait 200 ms }
    How many times does the LED blink in 10 seconds?
13. 13.🔌 Is a buzzer an input or an output for a microcontroller? (a) output (b) input
14. 14.🌐 How does a home IoT device usually send its data to the app? (a) by post (b) over Wi-Fi (c) through a candle (d) by shouting
15. 15.True or false: a slide switch springs back when let go. (a) True (b) False
16. 16.True or false: to share only needed data is a good habit. (a) True (b) False
17. 17.🧮 Five equal 50 Ω resistors are joined in parallel. What is the total resistance (in ohms)?
18. 18.Which of these usually has a microcontroller inside? (a) a plain wall switch (b) a wind-up toy (c) a digital alarm clock (d) a bicycle bell
19. 19.⏱️ How many milliseconds is a wait of 1.5 seconds?
20. 20.🔺 A current of 2.5 A flows when 37.5 V is joined across a resistor. What is its resistance (in ohms)?
21. 21.Which of these is a conductor? (a) a safety pin (b) a rubber eraser (c) a rubber band (d) a plastic straw
22. 22.🧩 A capacitor in a circuit can … (a) make light (b) spin a wheel (c) measure heat (d) store charge briefly
23. 23.⚡ Which formula gives electric power? (a) P = I ÷ V (b) P = V × I (c) P = V + I (d) P = V ÷ I
24. 24.Which of these is the input? (a) a light level reading (b) an LED lights up (c) check if temp > 30 (d) a buzzer beeps
25. 25.True or false: to keep drinks far away is safe. (a) False (b) True
26. 26.🌈 In the resistor colour code, which number does brown stand for?
27. 27.🔺 In the V-I-R triangle, how do we find R? (a) R = V × I (b) R = V ÷ I (c) R = I ÷ V (d) R = V + I
28. 28.🌈 Which colour bands (1st digit, 2nd digit, multiplier) mark an 830 Ω resistor? (a) grey-orange-brown (b) grey-orange-red (c) grey-orange-black (d) orange-grey-brown
29. 29.True or false: “one bulb out, all go out” is true of a series circuit. (a) True (b) False
30. 30.True or false: a push button springs back when let go. (a) True (b) False
31. 31.🧾 A 1500 W appliance runs for 4 hours. How many units (kWh) of electricity does it use? =
32. 32.🤖 Does a wind-up toy usually have a microcontroller inside? (a) Yes (b) No
33. 33.🔁 What do we call a circuit with a break in it? (a) an open circuit (b) a series circuit (c) a closed circuit (d) a full circuit
34. 34.🔋 2 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)? =
35. 35.📏 In the water-pipe picture of a circuit, voltage is like … (a) the pipe colour (b) the tap handle (c) the water pressure (d) the water tank lid
36. 36.💡 What happens if an LED is put in backwards? (a) it does not light (b) it makes a sound (c) it changes colour (d) it lights brighter
37. 37.Which of these uses electricity? (a) a wind turbine (b) an air conditioner (c) a solar panel (d) a bicycle dynamo
38. 38.🔘 A cell and a bulb are joined to 4 side-by-side paths with one switch on each path — A, B, C and D (parallel). A is OFF, B is OFF, C is OFF and D is OFF. Does the bulb glow? (a) No (b) Yes
39. 39.💡 A blue LED uses 3 V and should get 25 mA. It runs from a 5 V supply. What resistor (in ohms) is needed in series?
40. 40.True or false: “one bulb out, all go out” is true of a parallel circuit. (a) True (b) False

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