Electronics Worksheet: Final Test

Electronics lesson 30: Final electronics test · Set 571 · 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: the ammeter is joined in series. (a) False (b) True
2. 2.Which of these is an input? (a) a motion sensor (b) a servo motor (c) a motor (d) a buzzer
3. 3.⚠️ Is it safe to throw cells in a fire? (a) safe (b) not safe
4. 4.🔍 Which is the odd one out? (a) a Wi-Fi smart plug (b) a Wi-Fi doorbell camera (c) a plain wall switch (d) a fitness band with app
5. 5.🔍 Which sensor would you use to stop a robot near walls? (a) a light sensor (b) a rain sensor (c) a distance sensor (d) a motion sensor
6. 6.True or false: a loudspeaker mainly makes sound. (a) True (b) False
7. 7.🔁 repeat 4 times { repeat 5 times { beep } }
   How many beeps are there?
8. 8.🔍 Which sensor would you use to switch on lamps at dusk? (a) a motion sensor (b) a sound sensor (c) a light sensor (d) a temperature sensor
9. 9.⚡ A device works on 1.5 V and takes 3 A. What is its power (in watts)? =
10. 10.💡 A battery lights 2 identical bulbs joined in series. One more identical bulb is added in series. How do the bulbs glow now? (a) dimmer (b) the same (c) brighter
11. 11.🔌 Is a graphite rod a conductor or an insulator? (a) a conductor (b) an insulator
12. 12.What does the sensor do? (a) measures the real world (b) stores data online (c) reads values, decides (d) carries the data
13. 13.🤖 if (temperature > 30) { show “Hot” } else if (temperature > 20) { show “Warm” } else { show “Cool” }
    The temperature is 29 °C. What is shown? (a) Cool (b) Warm (c) Hot
14. 14.🧩 Which component smooths a wobbly supply? (a) potentiometer (b) buzzer (c) capacitor (d) thermistor
15. 15.True or false: on a cell, “the end with a bump” means the − (negative) end. (a) True (b) False
16. 16.🤖 if (temperature > 30) { show “Hot” } else if (temperature > 18) { show “Warm” } else { show “Cool” }
    The temperature is 11 °C. What is shown? (a) Cool (b) Hot (c) Warm
17. 17.🔘 A bulb and a cell are joined through 5 switches one after another in a single loop (series). What is the smallest number of switches that must be ON to light the bulb?
18. 18.⚡ A device works on 3 V and takes 0.5 A. What is its power (in watts)? =
19. 19.🔋 A 3 V battery and four 1.5 V cells are joined in series, all facing the same way. What is the total voltage (in volts)? =
20. 20.True or false: to open blinds at sunrise, use a distance sensor. (a) False (b) True
21. 21.🔐 Is it a good or a risky habit to set a strong password? (a) risky habit (b) good habit
22. 22.🔍 Which is the odd one out? (a) set a strong password (b) post your live location (c) reuse one password (d) ignore update messages
23. 23.What does a toggle switch do? (a) works only while pressed (b) springs back when let go (c) closes near a magnet (d) stays where you flip it
24. 24.🔋 On a cell, does “the longer symbol line” mean the + end or the − end? (a) − (negative) (b) + (positive)
25. 25.True or false: if the loop is complete, the circuit is open and no current flows. (a) False (b) True
26. 26.🧮 Two resistors in parallel give a total that is … (a) their sum (b) less than either one (c) always zero (d) more than either one
27. 27.🧩 Which component makes a beeping sound? (a) buzzer (b) fuse (c) thermistor (d) motor
28. 28.Which of these is an input? (a) an LED (b) a sound sensor (c) a speaker (d) a small display
29. 29.🔐 Is it a good or a risky habit to turn off unused gadgets? (a) risky habit (b) good habit
30. 30.⚡ What does a torch mainly change electricity into? (a) movement (b) sound (c) light (d) heat
31. 31.⚡ What does an electric kettle mainly change electricity into? (a) heat (b) movement (c) light (d) sound
32. 32.🔁 Is the circuit closed or open if the loop is complete? (a) open (b) closed
33. 33.🧾 A 200 W appliance runs for 8 hours. How many units (kWh) of electricity does it use? =
34. 34.Which of these is a risky habit? (a) share only needed data (b) accept every permission (c) log out of shared phones (d) read app permissions
35. 35.🌐 A soil sensor sends a reading to an app every 10 minutes. How many readings arrive in 3 hours?
36. 36.🧩 Which component is a resistance knob? (a) potentiometer (b) fuse (c) LED (d) transistor
37. 37.💡 On an LED, is the shorter leg the anode (+) or the cathode (−)? (a) anode (+) (b) cathode (−)
38. 38.True or false: if all wires are joined, the circuit is open and no current flows. (a) True (b) False
39. 39.✏️ In a circuit diagram, which part is drawn as one tall, one short bar? (a) bulb (b) capacitor (c) switch (d) cell
40. 40.True or false: a straight line is the symbol for a bulb. (a) True (b) False

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