Electronics Worksheet: Final Test

Electronics lesson 30: Final electronics test · Set 950 · 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 of these is true of a series circuit? (a) own switch for each bulb (b) many paths for current (c) bulbs share the voltage (d) each gets the full volts
2. 2.🧮 Adding another resistor in series makes the total resistance … (a) smaller (b) zero (c) stay the same (d) bigger
3. 3.True or false: if all wires are joined, the circuit is open and no current flows. (a) False (b) True
4. 4.True or false: on a cell, “the end with a bump” means the − (negative) end. (a) True (b) False
5. 5.True or false: “bulbs share the voltage” is true of a parallel circuit. (a) False (b) True
6. 6.🔗 Series or parallel circuit: “each gets the full volts”? (a) series (b) parallel
7. 7.📏 Voltmeter or ammeter: which one is joined in series? (a) ammeter (b) voltmeter
8. 8.💡 An LED (with its resistor) is on pin 8. All pins start LOW. The program runs once:
   set pin 7 LOW
   set pin 8 HIGH
   set pin 7 HIGH
   set pin 8 LOW
   Is the LED ON or OFF at the end? (a) OFF (b) ON
9. 9.True or false: a long and a short line is the symbol for a cell. (a) False (b) True
10. 10.🔺 An 18.8 V supply is joined across a 470 Ω resistor. What current flows (in milliamperes, mA)?
11. 11.Which of these has no microcontroller inside? (a) a washing machine (b) a smart watch (c) a candle (d) a toy robot
12. 12.🌈 In the resistor colour code, which number does white stand for?
13. 13.True or false: a straight line is the symbol for a bulb. (a) True (b) False
14. 14.🔁 What must there be for a current to flow? (a) a plastic gap (b) a complete loop (c) a broken path (d) one loose end
15. 15.🧩 Which component makes a beeping sound? (a) buzzer (b) potentiometer (c) thermistor (d) capacitor
16. 16.⚙️ What is an actuator? (a) a battery (b) an output that acts (c) a program (d) a sensor
17. 17.🧮 A 2 V battery is joined to 8 Ω and 2 Ω resistors in series. What current flows (in amperes)? =
18. 18.Which of these is a conductor? (a) a cotton thread (b) a glass marble (c) an iron nail (d) a ceramic cup
19. 19.🔍 A distance sensor sends a sound pulse and hears the echo 8 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
20. 20.True or false: to unplug idle chargers wastes electricity. (a) True (b) False
21. 21.Which job is done by the USB port? (a) restarts the program (b) runs the program (c) connect sensors and LEDs (d) brings power and code
22. 22.True or false: a potentiometer has coloured bands. (a) True (b) False
23. 23.⚡ A 24 W device works on 24 V. What current does it take (in amperes)? =
24. 24.🔁 repeat 6 times { repeat 4 times { beep } }
    How many beeps are there?
25. 25.True or false: to share only needed data is a risky habit. (a) False (b) True
26. 26.True or false: voltage is measured in volts (V). (a) True (b) False
27. 27.⏱️ loop forever { LED ON; wait 450 ms; LED OFF; wait 1550 ms }
    How many times does the LED blink in 6 seconds?
28. 28.🔘 Which kind of switch slides side to side? (a) a slide switch (b) a toggle switch (c) a reed switch (d) a tilt switch
29. 29.🔺 In the V-I-R triangle, how do we find I? (a) I = V × R (b) I = V ÷ R (c) I = R ÷ V (d) I = V + R
30. 30.🔢 To plan an electronics project, which comes first: “test it and fix it” or “pick a problem to solve”? (a) test it and fix it (b) pick a problem to solve
31. 31.Which of these is true of a series circuit? (a) one bulb out, all go out (b) many paths for current (c) one out, the rest glow (d) each gets the full volts
32. 32.🤖 if (temperature > 37) { show “Hot” } else if (temperature > 23) { show “Warm” } else { show “Cool” }
    The temperature is 13 °C. What is shown? (a) Warm (b) Hot (c) Cool
33. 33.📏 In the water-pipe picture of a circuit, current is like … (a) the water pressure (b) the pipe colour (c) a narrow pipe (d) the flow of water
34. 34.What does the cloud server do? (a) stores data online (b) reads values, decides (c) acts on a command (d) measures the real world
35. 35.⚡ Power tells us … (a) the colour of light (b) energy used each second (c) the size of a cell (d) the length of a wire
36. 36.⚡ A device works on 24 V and takes 1.5 A. What is its power (in watts)? =
37. 37.⏱️ loop forever { LED ON; wait 50 ms; LED OFF; wait 350 ms }
    How many times does the LED blink in 12 seconds?
38. 38.🌈 A resistor has the colour bands red, violet, red. What is its value in kilo-ohms (kΩ)? =
39. 39.⚡ A 0.15 W device works on 1.5 V. What current does it take (in amperes)? =
40. 40.🔘 A bulb and a cell are joined through 6 switches one after another in a single loop (series). What is the smallest number of switches that must be ON to light the bulb?

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