Electronics Worksheet: Final Test

Electronics lesson 30: Final electronics test · Set 850 · 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) the else part (b) neither part (c) the if part (d) both parts
2. 2.Which of these means the circuit is open? (a) the switch is ON (b) the loop is complete (c) all wires are joined (d) the bulb is unscrewed
3. 3.✏️ Why do engineers draw circuits with symbols? (a) symbols are heavier (b) quick and clear for all (c) to make it colourful (d) to hide the circuit
4. 4.True or false: voltage is measured in watts (W). (a) True (b) False
5. 5.Which of these mainly gives out heat? (a) a table fan (b) an electric kettle (c) a school bell (d) a ceiling fan
6. 6.🧭 Which part of a microcontroller board shows the board is on? (a) the power LED (b) the main chip (c) the voltage regulator (d) the USB port
7. 7.📏 Which unit measures the push of a cell? (a) volt (V) (b) ohm (Ω) (c) ampere (A) (d) watt (W)
8. 8.True or false: a digital alarm clock usually has a microcontroller inside. (a) True (b) False
9. 9.⚙️ Which actuator would you use to show the temperature? (a) a servo motor (b) a display (c) a buzzer (d) a pump
10. 10.What does a tilt switch do? (a) closes when tipped over (b) stays where you flip it (c) springs back when let go (d) closes near a magnet
11. 11.⚡ A home appliance on the 230 V mains takes 1.5 A. What is its power (in watts)?
12. 12.🤖 if (temperature > 32) { show “Hot” } else if (temperature > 24) { show “Warm” } else { show “Cool” }
    The temperature is 19 °C. What is shown? (a) Cool (b) Hot (c) Warm
13. 13.🔺 A current of 0.2 A flows through a 5 Ω resistor. What is the voltage across it (in volts)? =
14. 14.Which of these is a conductor? (a) a rubber band (b) a glass marble (c) a steel coin (d) a wooden stick
15. 15.📏 Which unit measures energy used each second? (a) ampere (A) (b) watt (W) (c) ohm (Ω) (d) volt (V)
16. 16.⏱️ How many milliseconds are in 1 second? (a) 1000 (b) 10 (c) 100 (d) 60
17. 17.🔦 A tester circuit has a new cell, a good bulb and wires with a gap between two clips. We put a ceramic cup across the gap. Does the bulb glow? (a) No (b) Yes
18. 18.🔍 Which is the odd one out? (a) a copper wire (b) a plastic ruler (c) a safety pin (d) a steel spoon
19. 19.True or false: a line lifted at a gap is the symbol for a switch. (a) False (b) True
20. 20.🔦 A circuit has a new cell, a bulb with a broken filament 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) Yes (b) No
21. 21.True or false: a buzzer smooths a wobbly supply. (a) False (b) True
22. 22.Which of these is the output? (a) check if temp > 30 (b) a button press (c) an LED lights up (d) a motion sensor signal
23. 23.🔁 What does “count = count + 1” do? (a) prints 1 (b) sets count to 1 (c) takes 1 away (d) adds 1 to count
24. 24.🔁 What must there be for a current to flow? (a) a plastic gap (b) one loose end (c) a complete loop (d) a broken path
25. 25.🔁 count = 1
    while (count < 36) { count = count + 5 }
    How many times does the loop run?
26. 26.True or false: if the switch is OFF, the circuit is open and no current flows. (a) True (b) False
27. 27.🔺 A current of 10 mA flows through a 150 Ω resistor. What is the voltage across it (in volts)? =
28. 28.💡 In a series circuit, how many paths does the current have? (a) one (b) one for each bulb (c) two (d) none
29. 29.🧮 Two equal 470 Ω resistors are joined in parallel. What is the total resistance (in ohms)?
30. 30.⏱️ loop forever { LED ON; wait 150 ms; LED OFF; wait 250 ms }
    How many times does the LED blink in 6 seconds?
31. 31.🧭 Which part of a microcontroller board connect sensors and LEDs? (a) the pins (b) the voltage regulator (c) the reset button (d) the USB port
32. 32.Which of these is a risky habit? (a) log out of shared phones (b) accept every permission (c) set a strong password (d) cover unused cameras
33. 33.📏 Which unit measures power? (a) ampere (A) (b) ohm (Ω) (c) watt (W) (d) volt (V)
34. 34.Which of these gives us electricity? (a) an air conditioner (b) a mobile phone (c) a water pump (d) a solar panel
35. 35.Which of these is an output? (a) a turning knob (b) a keypad (c) a light sensor (d) a water pump
36. 36.What does a capacitor do? (a) makes things spin (b) is a resistance knob (c) glows using little power (d) stores a little charge
37. 37.🔌 Is a metal paper clip a conductor or an insulator? (a) a conductor (b) an insulator
38. 38.🔗 Series or parallel circuit: “a break stops every bulb”? (a) parallel (b) series
39. 39.True or false: “each gets the full volts” is true of a parallel circuit. (a) False (b) True
40. 40.🗺️ In an input → process → output plan, is “the fan starts” the input, the process or the output? (a) input (b) process (c) output

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