Electronics Worksheet: Final Test

Electronics lesson 30: Final electronics test · Set 211 · 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.🤖 In “if (temp > 30)”, what runs when temp is exactly 30? (a) neither part (b) the else part (c) the if part (d) both parts
2. 2.Which of these is the input? (a) count button presses (b) compare with a limit (c) an alert on the phone (d) a button press
3. 3.🔺 The voltage stays the same and the resistance gets bigger. The current … (a) gets bigger (b) becomes zero (c) gets smaller (d) stays the same
4. 4.Which of these is safe? (a) use small battery cells (b) climb an electric pole (c) fly a kite near wires (d) touch a switch when wet
5. 5.🔍 A distance sensor sends a sound pulse and hears the echo 13 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
6. 6.🔍 A distance sensor sends a sound pulse and hears the echo 4 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
7. 7.🔦 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 cotton thread. Does the bulb glow? (a) Yes (b) No
8. 8.True or false: a brass key is an insulator. (a) True (b) False
9. 9.🌈 In the resistor colour code, which number does blue stand for?
10. 10.🔢 To plan an electronics project, which comes first: “list inputs and outputs” or “build it with an adult”? (a) list inputs and outputs (b) build it with an adult
11. 11.Which of these is an IoT device? (a) a wind-up clock (b) a plain wall switch (c) a battery torch (d) a smart energy meter
12. 12.📏 How many kilowatts (kW) is 2950 W? =
13. 13.🔍 Which is the odd one out? (a) open a phone charger (b) fly kites in open fields (c) stay away from pylons (d) keep drinks far away
14. 14.What does a diode do? (a) limits the current (b) blows if current is high (c) lets current go one way (d) has coloured bands
15. 15.💡 What happens if an LED is put in backwards? (a) it does not light (b) it changes colour (c) it makes a sound (d) it lights brighter
16. 16.🔋 What is a battery? (a) one single wire (b) a kind of bulb (c) two or more cells joined (d) a switch with a lid
17. 17.✏️ In a cell symbol, which line is the + terminal? (a) the shorter line (b) neither line (c) the longer line (d) both lines
18. 18.🔗 Series or parallel circuit: “a break stops every bulb”? (a) parallel (b) series
19. 19.True or false: “each gets the full volts” is true of a series circuit. (a) False (b) True
20. 20.Which of these is true of a parallel circuit? (a) a break stops every bulb (b) one bulb out, all go out (c) each gets the full volts (d) bulbs share the voltage
21. 21.🤖 if (distance < 10) { buzzer beeps } else { buzzer is silent }
    The distance sensor reads 3 cm. What happens? (a) buzzer beeps (b) buzzer is silent
22. 22.Which of these is safe? (a) touch a fallen wire (b) poke things in a socket (c) climb an electric pole (d) take cells out after use
23. 23.🔍 Which is the odd one out? (a) accept every permission (b) read app permissions (c) share camera links (d) tap unknown app links
24. 24.🤖 “if (A AND B)” is true when … (a) both A and B are true (b) both are false (c) only A is true (d) only B is true
25. 25.🤖 if (light < 400) { lamp ON } else { lamp OFF }
    The light sensor reads 397. What happens? (a) lamp ON (b) lamp OFF
26. 26.🧮 Adding another resistor in series makes the total resistance … (a) smaller (b) zero (c) stay the same (d) bigger
27. 27.🗺️ Before building a project, what should you write down first? (a) the box colour (b) inputs and outputs (c) the final price (d) nothing at all
28. 28.⚡ A 0.6 W device works on 3 V. What current does it take (in amperes)? =
29. 29.⏱️ loop forever { LED ON; wait 100 ms; LED OFF; wait 400 ms }
    How many milliseconds does one blink (ON + OFF) take?
30. 30.True or false: triangle against a bar is the symbol for a diode. (a) True (b) False
31. 31.🤖 if (sound > 70) { red LED ON } else { green LED ON }
    The sound sensor reads 52. What happens? (a) green LED ON (b) red LED ON
32. 32.🔁 count = 4
    while (count < 20) { count = count + 2 }
    How many times does the loop run?
33. 33.🔘 Which kind of switch works only while pressed? (a) a tilt switch (b) a push button (c) a toggle switch (d) a slide switch
34. 34.True or false: to keep factory passwords is a risky habit. (a) False (b) True
35. 35.🔍 Which is the odd one out? (a) a plastic ruler (b) a plastic straw (c) a copper wire (d) a woollen thread
36. 36.🔁 total = 0
    for i = 1 to 12 { total = total + i }
    What is total at the end?
37. 37.🔢 To run one loop of a plant-watering program, which comes first: “compare with the limit” or “wait a few seconds”? (a) compare with the limit (b) wait a few seconds
38. 38.🧩 A capacitor in a circuit can … (a) spin a wheel (b) store charge briefly (c) make light (d) measure heat
39. 39.True or false: many long-short pairs is the symbol for a resistor. (a) True (b) False
40. 40.🔍 Which is the odd one out? (a) a toaster (b) a table fan (c) a room heater (d) an electric iron

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