Electronics Worksheet: Final Test

Electronics lesson 30: Final electronics test · Set 764 · 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 “count = count + 1” do? (a) prints 1 (b) takes 1 away (c) sets count to 1 (d) adds 1 to count
2. 2.🔌 Is a glass marble a conductor or an insulator? (a) a conductor (b) an insulator
3. 3.🔋 A 12 V battery and two 1.5 V cells are joined in series, all facing the same way. What is the total voltage (in volts)? =
4. 4.✏️ In a circuit diagram, which part is drawn as one tall, one short bar? (a) wire (b) diode (c) capacitor (d) cell
5. 5.🔍 Which is the odd one out? (a) a school bell (b) a buzzer (c) a street light (d) a doorbell
6. 6.🔁 count = 8
   repeat 2 times { count = count + 3 }
   What is count at the end?
7. 7.📶 A pin set LOW gives about … (a) 9 V (b) 0 V (c) 1.5 V (d) 5 V
8. 8.🔘 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 OFF, B is ON and C is ON. Does the bulb glow? (a) Yes (b) No
9. 9.✏️ In a circuit diagram, which part is drawn as triangle, bar and arrows? (a) diode (b) LED (c) resistor (d) motor
10. 10.🔋 7 identical 1.2 V cells are joined in series (+ of one cell to − of the next). What is the total voltage (in volts)? =
11. 11.⚡ Which formula gives electric power? (a) P = V + I (b) P = V ÷ I (c) P = I ÷ V (d) P = V × I
12. 12.🌈 A resistor has the colour bands brown, grey, brown. What is its value (in ohms)?
13. 13.🔌 Is an LED an input or an output for a microcontroller? (a) output (b) input
14. 14.🤖 if (temperature > 30) { show “Hot” } else if (temperature > 25) { show “Warm” } else { show “Cool” }
    The temperature is 30 °C. What is shown? (a) Hot (b) Warm (c) Cool
15. 15.💡 A battery lights 5 identical bulbs joined in parallel. One more identical bulb is added in parallel. How do the bulbs glow now? (a) dimmer (b) brighter (c) the same
16. 16.⚠️ Who should be with you when you build a circuit? (a) a trusted adult (b) a stranger online (c) a younger child (d) nobody
17. 17.True or false: on an LED, the longer leg is the anode (+). (a) False (b) True
18. 18.🔺 A 5 V supply is joined across a 100 Ω resistor. What current flows (in milliamperes, mA)?
19. 19.True or false: a water heater mainly gives out heat. (a) True (b) False
20. 20.🔗 Series or parallel circuit: “each gets the full volts”? (a) series (b) parallel
21. 21.True or false: a thermistor turns a fan or wheels. (a) False (b) True
22. 22.True or false: to switch on with a clap, use a temperature sensor. (a) True (b) False
23. 23.Which of these gives us electricity? (a) a computer (b) a bicycle dynamo (c) a washing machine (d) a water pump
24. 24.🔋 How many 1.2 V cells must be joined in series to give 8.4 V?
25. 25.💡 An LED (with its resistor) is on pin 7. All pins start LOW. The program runs once:
    set pin 8 LOW
    set pin 8 HIGH
    Is the LED ON or OFF at the end? (a) OFF (b) ON
26. 26.🤖 Does a microwave oven usually have a microcontroller inside? (a) Yes (b) No
27. 27.True or false: a steel coin is an insulator. (a) True (b) False
28. 28.Which of these is true of a series circuit? (a) used in house wiring (b) each gets the full volts (c) a break stops every bulb (d) one out, the rest glow
29. 29.⚡ A home appliance on the 230 V mains takes 8 A. What is its power (in watts)?
30. 30.🔍 Which is the odd one out? (a) a water heater (b) a torch (c) a street light (d) an LED lamp
31. 31.🔁 repeat 4 times { repeat 3 times { beep } }
    How many beeps are there?
32. 32.💡 4 identical bulbs are joined in series with a battery and a closed switch on the main wire. All the bulbs are in place. Does bulb 2 glow? (a) Yes (b) No
33. 33.Which of these is a conductor? (a) a copper wire (b) a ceramic cup (c) a glass marble (d) a paper strip
34. 34.🔍 Which is the odd one out? (a) a traffic signal (b) an LED lamp (c) a street light (d) a room heater
35. 35.🔺 A current of 0.5 A flows when 1 V is joined across a resistor. What is its resistance (in ohms)?
36. 36.🔺 A current of 25 mA flows when 3 V is joined across a resistor. What is its resistance (in ohms)?
37. 37.🔌 Is a plastic ruler a conductor or an insulator? (a) a conductor (b) an insulator
38. 38.🧾 A 100 W filament bulb is swapped for a 15 W LED lamp that gives about the same light. Both would run for 1 hour. How many watt-hours (Wh) are saved?
39. 39.🔺 A current of 50 mA flows through a 150 Ω resistor. What is the voltage across it (in volts)? =
40. 40.🔺 A current of 0.1 A flows when 1.5 V is joined across a resistor. What is its resistance (in ohms)?

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