Electronics Worksheet: Final Test

Electronics lesson 30: Final electronics test · Set 370 · 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 actuator would you use to turn to an exact angle? (a) a servo motor (b) a motor (c) an LED (d) a pump
2. 2.⚡ A solar panel changes which kind of energy into electricity? (a) sound energy (b) chemical energy (c) wind energy (d) light energy
3. 3.True or false: to unplug idle chargers saves electricity. (a) True (b) False
4. 4.Which of these mainly gives out heat? (a) an exhaust fan (b) a water heater (c) a night lamp (d) a ceiling fan
5. 5.True or false: an exhaust fan mainly makes movement. (a) False (b) True
6. 6.🔺 A 2.2 V supply is joined across a 220 Ω resistor. What current flows (in milliamperes, mA)?
7. 7.Which job is done by the main chip? (a) connect sensors and LEDs (b) runs the program (c) brings power and code (d) shows the board is on
8. 8.True or false: to fly kites in open fields is not safe. (a) False (b) True
9. 9.🧭 Which part of a microcontroller board keeps the voltage steady? (a) the pins (b) the voltage regulator (c) the power LED (d) the main chip
10. 10.True or false: a traffic signal mainly gives out heat. (a) True (b) False
11. 11.🔁 What does a variable do in a program? (a) stores a value (b) blinks an LED (c) measures light (d) joins two wires
12. 12.True or false: “each gets the full volts” is true of a series circuit. (a) True (b) False
13. 13.🔁 What does “count = count + 1” do? (a) takes 1 away (b) sets count to 1 (c) prints 1 (d) adds 1 to count
14. 14.✏️ In a circuit diagram, wires are usually drawn as … (a) straight lines (b) dotted circles (c) little stars (d) wavy lines
15. 15.🔦 A circuit has a used-up (dead) 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 safety pin. Does the bulb glow? (a) No (b) Yes
16. 16.🗺️ In an input → process → output plan, is “the pump turns on” the input, the process or the output? (a) process (b) output (c) input
17. 17.🌈 A resistor has the colour bands white, brown, red. What is its value in kilo-ohms (kΩ)? =
18. 18.💡 An LED (with its resistor) is on pin 8. All pins start LOW. The program runs once:
    set pin 8 HIGH
    set pin 8 HIGH
    set pin 8 HIGH
    set pin 7 LOW
    set pin 7 HIGH
    Is the LED ON or OFF at the end? (a) ON (b) OFF
19. 19.🔺 The voltage stays the same and the resistance gets bigger. The current … (a) gets bigger (b) gets smaller (c) becomes zero (d) stays the same
20. 20.⏱️ How many milliseconds are in 1 second? (a) 1000 (b) 60 (c) 10 (d) 100
21. 21.🔺 In the V-I-R triangle, how do we find R? (a) R = V ÷ I (b) R = V + I (c) R = V × I (d) R = I ÷ V
22. 22.What does the sensor do? (a) stores data online (b) carries the data (c) acts on a command (d) measures the real world
23. 23.📏 Which unit measures current? (a) ampere (A) (b) volt (V) (c) watt (W) (d) ohm (Ω)
24. 24.What does the Wi-Fi link do? (a) acts on a command (b) reads values, decides (c) shows data to you (d) carries the data
25. 25.🔐 Is it a good or a risky habit to change default passwords? (a) risky habit (b) good habit
26. 26.✏️ In a circuit diagram, which part is drawn as a circle with M inside? (a) bulb (b) voltmeter (c) capacitor (d) motor
27. 27.True or false: to take cells out after use is safe. (a) True (b) False
28. 28.📏 How many kilowatts (kW) is 3050 W? =
29. 29.🔋 How many 1.2 V cells must be joined in series to give 3.6 V?
30. 30.✏️ In a circuit diagram, which part is drawn as one tall, one short bar? (a) resistor (b) switch (c) bulb (d) cell
31. 31.🔘 Which kind of switch closes when tipped over? (a) a tilt switch (b) a slide switch (c) a push button (d) a reed switch
32. 32.🔺 A current of 40 mA flows through a 100 Ω resistor. What is the voltage across it (in volts)? =
33. 33.🔁 In an old-style bulb, which thin wire glows when current flows? (a) the glass (b) the switch (c) the base (d) the filament
34. 34.⏱️ A program says “wait 5000 ms”. How many seconds is that? =
35. 35.🔦 A circuit has a new cell, a good bulb and a switch that is ON. All the wires are firmly joined. Does the bulb glow? (a) No (b) Yes
36. 36.True or false: to share only needed data is a good habit. (a) False (b) True
37. 37.🧮 Resistors of 10 Ω and 47 Ω are joined in series. What is the total resistance (in ohms)?
38. 38.Which of these is the input? (a) check if temp > 30 (b) a buzzer beeps (c) the pump turns on (d) a light level reading
39. 39.⚠️ Is it safe to poke things in a socket? (a) not safe (b) safe
40. 40.True or false: on a cell, “the shorter symbol line” means the − (negative) end. (a) False (b) True

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