Electronics Worksheet: Final Test

Electronics lesson 30: Final electronics test · Set 492 · 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.🔋 Cells joined + to − in a row (series) give … (a) a smaller voltage (b) the same voltage (c) a bigger voltage (d) no voltage
2. 2.🔍 Which is the odd one out? (a) a paper strip (b) a rubber eraser (c) a safety pin (d) a plastic ruler
3. 3.True or false: “own switch for each bulb” is true of a series circuit. (a) True (b) False
4. 4.⚡ A device works on 1.5 V and takes 0.25 A. What is its power (in watts)? =
5. 5.✏️ In a circuit diagram, which part is drawn as two or more cell symbols? (a) battery (b) bulb (c) resistor (d) cell
6. 6.🔘 Which kind of switch springs back when let go? (a) a reed switch (b) a toggle switch (c) a slide switch (d) a push button
7. 7.Which of these is an output? (a) a speaker (b) a sound sensor (c) a light sensor (d) a motion sensor
8. 8.🔗 Series or parallel circuit: “bulbs share the voltage”? (a) series (b) parallel
9. 9.⚙️ Which actuator would you use to turn to an exact angle? (a) an LED (b) a buzzer (c) a motor (d) a servo motor
10. 10.🤖 if (light < 500) { lamp ON } else { lamp OFF }
    The light sensor reads 409. What happens? (a) lamp ON (b) lamp OFF
11. 11.🔦 A tester circuit has a new cell, a good bulb and wires with a gap between two clips. We put a paper strip across the gap. Does the bulb glow? (a) Yes (b) No
12. 12.⚠️ Is it safe to build with an adult near? (a) not safe (b) safe
13. 13.🔁 Is the circuit closed or open if the switch is OFF? (a) closed (b) open
14. 14.✏️ In a circuit diagram, which part is drawn as triangle, bar and arrows? (a) junction (b) motor (c) LED (d) voltmeter
15. 15.💡 Why is house wiring done in parallel? (a) to save copper only (b) to make bulbs dim (c) so all go off together (d) each gets full voltage
16. 16.True or false: the voltmeter measures current. (a) True (b) False
17. 17.Which of these is measured in amperes (A)? (a) resistance (b) the flow of charge (c) energy used each second (d) the push of a cell
18. 18.📶 Digital or analog: how bright a room is? (a) digital (b) analog
19. 19.🔺 A current of 1.5 A flows through a 15 Ω resistor. What is the voltage across it (in volts)? =
20. 20.📏 How many amperes (A) is 2250 mA? =
21. 21.💡 An LED is joined to a 6 V battery with no resistor; its long leg goes to the + side and its short leg to the − side. What happens? (a) may burn out (b) lights up (c) does not light
22. 22.🌈 In the resistor colour code, which number does black stand for?
23. 23.🔍 Which is the odd one out? (a) a buzzer (b) a motion sensor (c) a temperature sensor (d) a turning knob
24. 24.🔺 A current of 0.1 A flows through a 2 Ω resistor. What is the voltage across it (in volts)? =
25. 25.⚡ A 6 W device works on 3 V. What current does it take (in amperes)? =
26. 26.Which job is done by the pins? (a) brings power and code (b) shows the board is on (c) connect sensors and LEDs (d) restarts the program
27. 27.🔢 To get a sensor reading onto a phone, which is the FIRST step? (a) the app shows it (b) the cloud stores it (c) the sensor measures (d) it is sent by Wi-Fi
28. 28.⚡ What does a table fan mainly change electricity into? (a) light (b) heat (c) sound (d) movement
29. 29.🗺️ In “input → process → output”, which part is the decision the program makes? (a) the input (b) the process (c) the battery (d) the output
30. 30.💡 2 identical bulbs are joined in series with a 5 V battery (ideal wires). How many volts does each bulb get? =
31. 31.💡 2 identical bulbs are joined in series with a 3 V battery (ideal wires). How many volts does each bulb get? =
32. 32.🔺 A current of 50 mA flows through a 100 Ω resistor. What is the voltage across it (in volts)? =
33. 33.Which of these is true of a parallel circuit? (a) a break stops every bulb (b) own switch for each bulb (c) bulbs share the voltage (d) a single current path
34. 34.📏 How many ohms (Ω) is 10 kΩ?
35. 35.🌈 A gold fourth band on a resistor means the value may be off by … (a) 50 % (b) 25 % (c) 5 % (d) 0 %
36. 36.🔦 A circuit has a new cell, a good bulb and a switch that is OFF. All the wires are firmly joined. Does the bulb glow? (a) No (b) Yes
37. 37.🤖 What is a microcontroller? (a) a type of battery (b) a computer on one chip (c) a kind of bulb (d) a big desktop computer
38. 38.💡 6 identical bulbs are in parallel and each bulb has its own switch on its path. 1 of the switches is OFF and the rest are ON. How many bulbs glow?
39. 39.💡 6 identical bulbs are in parallel and each one takes 1 A. What total current (in amperes) comes from the battery? =
40. 40.🔘 Which kind of switch stays where you flip it? (a) a slide switch (b) a tilt switch (c) a push button (d) a toggle switch

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