Electronics Worksheet: Final Test

Electronics lesson 30: Final electronics test · Set 466 · 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.True or false: a laptop has a built-in keyboard. (a) False (b) True
2. 2.🌐 Is a paper calendar an IoT device? (a) an IoT device (b) not an IoT device
3. 3.True or false: “HIGH or LOW only” is an analog signal. (a) False (b) True
4. 4.🔢 To plan an electronics project, which is the FIRST step? (a) draw the circuit diagram (b) list inputs and outputs (c) pick a problem to solve (d) test it and fix it
5. 5.True or false: if a wire has come loose, the circuit is open and no current flows. (a) False (b) True
6. 6.⏱️ What does “wait 500 ms” do? (a) waits 500 seconds (b) turns the LED off (c) blinks 500 times (d) pauses for half a second
7. 7.True or false: “a break stops every bulb” is true of a parallel circuit. (a) False (b) True
8. 8.🔁 What do we call a circuit with a break in it? (a) an open circuit (b) a series circuit (c) a full circuit (d) a closed circuit
9. 9.True or false: a dry cork is a conductor. (a) False (b) True
10. 10.True or false: if a wire is cut, the circuit is closed and current flows. (a) True (b) False
11. 11.🤖 if (light < 300 AND motion) { porch lamp ON } else { porch lamp OFF }
    The light reading is 440 and motion is not detected (false). What happens? (a) porch lamp ON (b) porch lamp OFF
12. 12.🔋 On a cell, does “the end with a bump” mean the + end or the − end? (a) − (negative) (b) + (positive)
13. 13.Which of these mainly makes movement? (a) a ceiling fan (b) a rice cooker (c) a toaster (d) a traffic signal
14. 14.🔁 total = 0
    for i = 1 to 3 { total = total + i }
    What is total at the end?
15. 15.🌈 A resistor has the colour bands grey, brown, red. What is its value (in ohms)?
16. 16.Which of these is safe? (a) poke things in a socket (b) stay away from pylons (c) touch a fallen wire (d) touch a switch when wet
17. 17.🔁 Is the circuit closed or open if the switch is OFF? (a) open (b) closed
18. 18.🧮 Resistors of 330 Ω, 470 Ω and 33 Ω are joined in series. What is the total resistance (in ohms)?
19. 19.💡 4 identical bulbs are in parallel and each one takes 1.5 A. What total current (in amperes) comes from the battery? =
20. 20.True or false: if a cell is taken out, the circuit is open and no current flows. (a) True (b) False
21. 21.🔺 In the V-I-R triangle, how do we find I? (a) I = V × R (b) I = V + R (c) I = V ÷ R (d) I = R ÷ V
22. 22.Which job is done by the main chip? (a) runs the program (b) brings power and code (c) keeps the voltage steady (d) shows the board is on
23. 23.🔋 How many 1.2 V cells must be joined in series to give 7.2 V?
24. 24.True or false: “many paths for current” is true of a parallel circuit. (a) True (b) False
25. 25.Which of these is an input? (a) a water pump (b) an LED (c) a buzzer (d) a temperature sensor
26. 26.Which of these is not safe? (a) stay away from pylons (b) keep drinks far away (c) throw cells in a fire (d) stop if a part gets hot
27. 27.🔍 Which is the odd one out? (a) a plastic straw (b) a woollen thread (c) a dry cork (d) a graphite rod
28. 28.⏱️ A program says “wait 1250 ms”. How many seconds is that? =
29. 29.⚡ A 2.25 W device works on 9 V. What current does it take (in amperes)? =
30. 30.True or false: if the loop is complete, the circuit is closed and current flows. (a) True (b) False
31. 31.True or false: the voltmeter measures voltage. (a) False (b) True
32. 32.💡 An LED (with its resistor) is on pin 8. All pins start LOW. The program runs once:
    set pin 7 HIGH
    set pin 7 HIGH
    set pin 8 LOW
    Is the LED ON or OFF at the end? (a) ON (b) OFF
33. 33.⚡ Power tells us … (a) the colour of light (b) the length of a wire (c) energy used each second (d) the size of a cell
34. 34.🌈 A resistor has the colour bands blue, green, orange. What is its value (in ohms)?
35. 35.🔁 count = 1
    while (count < 17) { count = count + 2 }
    How many times does the loop run?
36. 36.True or false: to start a fan when hot, use a temperature sensor. (a) False (b) True
37. 37.🌈 Which band is read first on a resistor? (a) the one nearest an end (b) the gold band (c) the widest gap (d) any band
38. 38.🔦 A circuit has a new cell, a good bulb and a switch that is ON. All the wires are firmly joined. A gap in one wire is bridged by a wooden stick. Does the bulb glow? (a) Yes (b) No
39. 39.🔺 A current of 10 mA flows when 5 V is joined across a resistor. What is its resistance (in ohms)?
40. 40.Which of these wastes electricity? (a) iron one shirt at a time (b) use LED lamps (c) switch off empty rooms (d) close the fridge quickly

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