Electronics Worksheet: Final Test

Electronics lesson 30: Final electronics test · Set 470 · 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.Which job is done by the pins? (a) brings power and code (b) runs the program (c) connect sensors and LEDs (d) shows the board is on
2. 2.🔍 Which is the odd one out? (a) set a strong password (b) install software updates (c) share only needed data (d) keep factory passwords
3. 3.🧮 A 10 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)?
4. 4.💡 A battery lights 2 identical bulbs joined in parallel. One more identical bulb is added in parallel. How do the bulbs glow now? (a) the same (b) dimmer (c) brighter
5. 5.Which of these is measured in amperes (A)? (a) power (b) current (c) resistance (d) energy used each second
6. 6.🔋 On a cell, does “the flat end” mean the + end or the − end? (a) − (negative) (b) + (positive)
7. 7.🔌 Is a glass marble a conductor or an insulator? (a) a conductor (b) an insulator
8. 8.🌈 Which colour bands (1st digit, 2nd digit, multiplier) mark a 45 Ω resistor? (a) yellow-green-brown (b) green-yellow-black (c) yellow-green-black (d) green-green-black
9. 9.📏 In the water-pipe picture of a circuit, resistance is like … (a) the water pressure (b) a bigger tank (c) a narrow pipe (d) the flow of water
10. 10.🔋 3 identical 1.5 V cells are joined in series, but one of them is put in the wrong way round. What is the total voltage now (in volts)? =
11. 11.🌐 In an IoT system, which part measures the real world? (a) sensor (b) microcontroller (c) cloud server (d) Wi-Fi
12. 12.💡 In a parallel circuit, one bulb breaks. What happens to the others? (a) they get dimmer (b) they all go out (c) they explode (d) they keep glowing
13. 13.True or false: “how loud a sound is” is a digital signal. (a) True (b) False
14. 14.💡 What does LED stand for? (a) light energy dial (b) light-emitting diode (c) large electric dial (d) low energy device
15. 15.🤖 if (temperature > 32) { fan ON } else { fan OFF }
    The temperature sensor reads 32 °C. What happens? (a) fan OFF (b) fan ON
16. 16.🧮 Two equal 200 Ω resistors are joined in parallel. What is the total resistance (in ohms)?
17. 17.🤖 if (temperature > 33) { show “Hot” } else if (temperature > 26) { show “Warm” } else { show “Cool” }
    The temperature is 32 °C. What is shown? (a) Cool (b) Warm (c) Hot
18. 18.🌐 Is a wind-up clock an IoT device? (a) an IoT device (b) not an IoT device
19. 19.📏 How many ohms (Ω) is 1.3 kΩ?
20. 20.📏 How many kilo-ohms (kΩ) is 9100 Ω? =
21. 21.🔁 What do we call a circuit with a break in it? (a) a full circuit (b) an open circuit (c) a closed circuit (d) a series circuit
22. 22.🧮 A 100 Ω resistor is joined in series with two equal 220 Ω resistors that are in parallel with each other. What is the total resistance (in ohms)?
23. 23.🔋 A 3 V battery and four 1.5 V cells are joined in series, all facing the same way. What is the total voltage (in volts)? =
24. 24.🤖 In “if (temp > 30)”, what runs when temp is exactly 30? (a) neither part (b) the if part (c) the else part (d) both parts
25. 25.🔘 When a switch is ON, the circuit is … (a) broken (b) open (c) cut (d) closed
26. 26.🔌 Is a copper wire a conductor or an insulator? (a) an insulator (b) a conductor
27. 27.🧮 Adding another resistor in series makes the total resistance … (a) bigger (b) smaller (c) stay the same (d) zero
28. 28.🔺 The voltage stays the same and the resistance gets bigger. The current … (a) gets bigger (b) stays the same (c) gets smaller (d) becomes zero
29. 29.📶 Digital or analog: how loud a sound is? (a) digital (b) analog
30. 30.True or false: “used in house wiring” is true of a parallel circuit. (a) False (b) True
31. 31.Which drawing is the symbol for a resistor? (a) one tall, one short bar (b) a circle with M inside (c) a circle with A inside (d) a plain rectangle
32. 32.🔁 total = 0
    for i = 1 to 5 { total = total + i }
    What is total at the end?
33. 33.📏 In the water-pipe picture of a circuit, current is like … (a) the pipe colour (b) the water pressure (c) a narrow pipe (d) the flow of water
34. 34.True or false: “many paths for current” is true of a parallel circuit. (a) False (b) True
35. 35.🔐 Which is the strongest password for a home smart camera? (a) password (b) Tiger#Lamp42!Moon (c) admin (d) 123456
36. 36.Which of these means the circuit is closed? (a) a wire has come loose (b) the switch is OFF (c) a cell is taken out (d) all wires are joined
37. 37.True or false: a buzzer mainly gives out light. (a) False (b) True
38. 38.🔁 repeat 2 times { repeat 2 times { beep } }
    How many beeps are there?
39. 39.🔍 Which is the odd one out? (a) a speaker (b) a push button (c) a motor (d) a small display
40. 40.🔍 Which is the odd one out? (a) a Wi-Fi doorbell camera (b) a Wi-Fi smart plug (c) a wind-up clock (d) an app-controlled bulb

Free electronics lessons, practice and worksheets at talentjr.in/electronics-for-kids