Electronics Worksheet: Final Test

Electronics lesson 30: Final electronics test · Set 597 · 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 digital alarm clock has no microcontroller inside. (a) False (b) True
2. 2.🌈 A resistor has the colour bands white, grey, yellow. What is its value in kilo-ohms (kΩ)? =
3. 3.Which of these mainly makes sound? (a) a rice cooker (b) an exhaust fan (c) a doorbell (d) an electric iron
4. 4.🧮 Adding another resistor in series makes the total resistance … (a) zero (b) smaller (c) stay the same (d) bigger
5. 5.⏱️ How many milliseconds is a wait of 2.5 seconds?
6. 6.⏱️ How many milliseconds are in 1 second? (a) 100 (b) 1000 (c) 10 (d) 60
7. 7.📏 Voltmeter or ammeter: which one is joined across a part? (a) ammeter (b) voltmeter
8. 8.🤖 “if (A AND B)” is true when … (a) only B is true (b) both are false (c) both A and B are true (d) only A is true
9. 9.🔍 Which is the odd one out? (a) a paper calendar (b) a plain wall switch (c) a battery torch (d) a Wi-Fi doorbell camera
10. 10.True or false: a slide switch slides side to side. (a) True (b) False
11. 11.🔺 A 12.5 V supply is joined across a 5 Ω resistor. What current flows (in amperes)? =
12. 12.True or false: a buzzer makes a beeping sound. (a) True (b) False
13. 13.💡 A red LED (it uses 2 V) is joined with a 100 Ω resistor to a 3 V supply. What current flows (in mA)?
14. 14.🔘 Which kind of switch closes when tipped over? (a) a slide switch (b) a reed switch (c) a push button (d) a tilt switch
15. 15.⚡ A fan changes electrical energy mainly into which kind of energy? (a) chemical energy (b) light energy (c) sound energy (d) movement energy
16. 16.True or false: to change default passwords is a good habit. (a) True (b) False
17. 17.🌈 A resistor has the colour bands brown, green, brown. What is its value (in ohms)?
18. 18.True or false: on a cell, “the end with a bump” means the + (positive) end. (a) False (b) True
19. 19.🌈 A resistor has the colour bands brown, black, red. What is its value in kilo-ohms (kΩ)? =
20. 20.📏 Which unit measures power? (a) volt (V) (b) watt (W) (c) ohm (Ω) (d) ampere (A)
21. 21.🧭 Which part of a microcontroller board restarts the program? (a) the reset button (b) the voltage regulator (c) the USB port (d) the pins
22. 22.True or false: current is measured in volts (V). (a) False (b) True
23. 23.True or false: if all wires are joined, the circuit is closed and current flows. (a) False (b) True
24. 24.🔺 A 15 V supply is joined across a 300 Ω resistor. What current flows (in milliamperes, mA)?
25. 25.🔦 A tester circuit has a new cell, a good bulb and wires with a gap between two clips. We put a copper wire across the gap. Does the bulb glow? (a) No (b) Yes
26. 26.Which of these usually has a microcontroller inside? (a) a plain wall switch (b) a microwave oven (c) a candle (d) a hand pump
27. 27.True or false: to install software updates is a good habit. (a) False (b) True
28. 28.🌈 A gold fourth band on a resistor means the value may be off by … (a) 0 % (b) 25 % (c) 5 % (d) 50 %
29. 29.⚡ A cell changes stored chemical energy into which kind of energy? (a) electrical energy (b) nuclear energy (c) wind energy (d) sound energy
30. 30.🧾 A family uses 90 units of electricity in a month and each unit costs ₹6. What is the bill (in ₹)?
31. 31.🔁 repeat 4 times { repeat 5 times { beep } }
    How many beeps are there?
32. 32.🔍 For a microcontroller, is a sensor an input or an output? (a) an output (b) an input (c) a power source (d) a fuse
33. 33.✏️ In a circuit diagram, which part is drawn as two equal parallel lines? (a) capacitor (b) voltmeter (c) junction (d) cell
34. 34.True or false: “bulbs share the voltage” is true of a parallel circuit. (a) True (b) False
35. 35.🔁 repeat 4 times { repeat 4 times { beep } }
    How many beeps are there?
36. 36.🔁 In an old-style bulb, which thin wire glows when current flows? (a) the glass (b) the filament (c) the switch (d) the base
37. 37.⏱️ How many milliseconds is a wait of 1.7 seconds?
38. 38.🤖 if (temperature > 34) { show “Hot” } else if (temperature > 22) { show “Warm” } else { show “Cool” }
    The temperature is 23 °C. What is shown? (a) Warm (b) Hot (c) Cool
39. 39.🏠 Which is a smart-home example? (a) a candle in a jar (b) lights on from an app (c) a printed map (d) a hand fan
40. 40.🔺 A 5 V supply is joined across a 100 Ω resistor. What current flows (in milliamperes, mA)?

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