Electronics Worksheet: Sensors and Actuators

Electronics lesson 26: Sensors and actuators · Set 310 · 40 questions

Remember (Measure it, then move it): Match the sensor to the quantity: light, heat, distance, movement, soil wetness, sound, gas or rain. Match the actuator to the action: spin (motor), exact angle (servo), beep (buzzer), light (LED), water (pump), numbers (display). Echo distance = 17 × echo time in ms (cm), because the sound goes there and back.

1. 1.🔍 A distance sensor sends a sound pulse and hears the echo 16 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
2. 2.⚙️ Which actuator would you use to open a gate to 90°? (a) an LED (b) a servo motor (c) a motor (d) a buzzer
3. 3.True or false: to water a dry plant, use a sound sensor. (a) False (b) True
4. 4.Which job needs a buzzer? (a) show a status light (b) move water to plants (c) beep an alarm (d) spin a robot’s wheels
5. 5.🔍 Which sensor would you use to start a fan when hot? (a) a motion sensor (b) a light sensor (c) a sound sensor (d) a temperature sensor
6. 6.🔍 Which sensor would you use to open blinds at sunrise? (a) a gas sensor (b) a distance sensor (c) a light sensor (d) a sound sensor
7. 7.True or false: to keep an incubator warm, use a distance sensor. (a) True (b) False
8. 8.🔍 An object is 68 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
9. 9.Which job needs a rain sensor? (a) switch on lamps at dusk (b) measure classroom noise (c) close a window in rain (d) keep an incubator warm
10. 10.🔍 Which sensor would you use to make a parking alarm? (a) a gas sensor (b) a sound sensor (c) a light sensor (d) a distance sensor
11. 11.Which job needs a distance sensor? (a) warn of a gas leak (b) stop a robot near walls (c) open blinds at sunrise (d) start a fan when hot
12. 12.Which job needs a sound sensor? (a) stop a robot near walls (b) measure classroom noise (c) switch on lamps at dusk (d) close a window in rain
13. 13.🔍 Which sensor would you use to close a window in rain? (a) a soil moisture sensor (b) a rain sensor (c) a sound sensor (d) a temperature sensor
14. 14.⚙️ Which actuator would you use to turn to an exact angle? (a) a motor (b) a display (c) a servo motor (d) an LED
15. 15.🔍 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)?
16. 16.True or false: to start a fan when hot, use a temperature sensor. (a) True (b) False
17. 17.Which job needs a servo motor? (a) open a gate to 90° (b) spin a robot’s wheels (c) show a status light (d) move water to plants
18. 18.True or false: to switch on lamps at dusk, use a light sensor. (a) True (b) False
19. 19.🔍 An object is 323 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
20. 20.Which job needs a motor? (a) open a gate to 90° (b) move water to plants (c) spin a robot’s wheels (d) show the temperature
21. 21.True or false: to start a fan when hot, use a light sensor. (a) False (b) True
22. 22.Which job needs a light sensor? (a) switch on with a clap (b) water a dry plant (c) close a window in rain (d) switch on lamps at dusk
23. 23.Which job needs a soil moisture sensor? (a) make a parking alarm (b) keep an incubator warm (c) water a dry plant (d) measure classroom noise
24. 24.🔍 Which sensor would you use to warn of a gas leak? (a) a light sensor (b) a rain sensor (c) a soil moisture sensor (d) a gas sensor
25. 25.Which job needs a display? (a) beep an alarm (b) open a gate to 90° (c) show the temperature (d) turn to an exact angle
26. 26.⚙️ Which actuator would you use to move water to plants? (a) a servo motor (b) a pump (c) a buzzer (d) an LED
27. 27.True or false: to spot someone walking in, use a motion sensor. (a) False (b) True
28. 28.⚙️ What is an actuator? (a) an output that acts (b) a program (c) a battery (d) a sensor
29. 29.True or false: to spot someone walking in, use a distance sensor. (a) True (b) False
30. 30.🔍 For a microcontroller, is a sensor an input or an output? (a) an input (b) an output (c) a power source (d) a fuse
31. 31.True or false: to close a window in rain, use a distance sensor. (a) False (b) True
32. 32.⚙️ Which actuator would you use to show the temperature? (a) a pump (b) a motor (c) a buzzer (d) a display
33. 33.🔍 Which sensor would you use to measure classroom noise? (a) a motion sensor (b) a soil moisture sensor (c) a sound sensor (d) a light sensor
34. 34.Which job needs a gas sensor? (a) close a window in rain (b) start a fan when hot (c) water a dry plant (d) warn of a gas leak
35. 35.🔍 Which sensor would you use to switch on lamps at dusk? (a) a distance sensor (b) a gas sensor (c) a light sensor (d) a motion sensor
36. 36.True or false: to keep an incubator warm, use a sound sensor. (a) True (b) False
37. 37.🔍 Which sensor would you use to stop a robot near walls? (a) a motion sensor (b) a soil moisture sensor (c) a rain sensor (d) a distance sensor
38. 38.⚙️ Which actuator would you use to beep an alarm? (a) a display (b) an LED (c) a buzzer (d) a pump
39. 39.Which job needs a sound sensor? (a) open blinds at sunrise (b) spot someone walking in (c) stop a robot near walls (d) switch on with a clap
40. 40.Which job needs a pump? (a) open a gate to 90° (b) show the temperature (c) turn to an exact angle (d) move water to plants

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