Electronics Worksheet: Sensors and Actuators

Electronics lesson 26: Sensors and actuators · Set 277 · 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.Which job needs a pump? (a) beep an alarm (b) move water to plants (c) spin a robot’s wheels (d) show the temperature
2. 2.⚙️ What is an actuator? (a) a sensor (b) an output that acts (c) a battery (d) a program
3. 3.Which job needs an LED? (a) turn to an exact angle (b) show a status light (c) beep an alarm (d) show the temperature
4. 4.Which job needs a motion sensor? (a) water a dry plant (b) measure classroom noise (c) spot someone walking in (d) switch on with a clap
5. 5.⚙️ Which actuator would you use to beep an alarm? (a) a display (b) a buzzer (c) a motor (d) a servo motor
6. 6.Which job needs a rain sensor? (a) make a parking alarm (b) switch on lamps at dusk (c) close a window in rain (d) stop a robot near walls
7. 7.True or false: to keep an incubator warm, use a motion sensor. (a) False (b) True
8. 8.True or false: to water a dry plant, use a soil moisture sensor. (a) False (b) True
9. 9.🔍 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?
10. 10.Which job needs a soil moisture sensor? (a) water a dry plant (b) switch on lamps at dusk (c) spot someone walking in (d) open blinds at sunrise
11. 11.🔍 A distance sensor sends a sound pulse and hears the echo 18 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
12. 12.True or false: to measure classroom noise, use a sound sensor. (a) True (b) False
13. 13.True or false: to close a window in rain, use a gas sensor. (a) True (b) False
14. 14.Which job needs a distance sensor? (a) open blinds at sunrise (b) water a dry plant (c) stop a robot near walls (d) close a window in rain
15. 15.Which job needs a light sensor? (a) stop a robot near walls (b) close a window in rain (c) start a fan when hot (d) open blinds at sunrise
16. 16.⚙️ Which actuator would you use to open a gate to 90°? (a) a display (b) a motor (c) a servo motor (d) a pump
17. 17.Which job needs a sound sensor? (a) measure classroom noise (b) stop a robot near walls (c) water a dry plant (d) open blinds at sunrise
18. 18.🔍 A distance sensor sends a sound pulse and hears the echo 6 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
19. 19.True or false: to switch on lamps at dusk, use a soil moisture sensor. (a) True (b) False
20. 20.🔍 A distance sensor sends a sound pulse and hears the echo 17 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
21. 21.⚙️ Which actuator would you use to show a status light? (a) a servo motor (b) a pump (c) an LED (d) a buzzer
22. 22.🔍 Which sensor would you use to warn of a gas leak? (a) a light sensor (b) a motion sensor (c) a gas sensor (d) a soil moisture sensor
23. 23.Which job needs a buzzer? (a) show the temperature (b) show a status light (c) beep an alarm (d) move water to plants
24. 24.Which job needs a gas sensor? (a) measure classroom noise (b) start a fan when hot (c) warn of a gas leak (d) close a window in rain
25. 25.🔍 For a microcontroller, is a sensor an input or an output? (a) an input (b) a power source (c) a fuse (d) an output
26. 26.Which job needs a display? (a) turn to an exact angle (b) show the temperature (c) spin a robot’s wheels (d) open a gate to 90°
27. 27.🔍 Which sensor would you use to stop a robot near walls? (a) a motion sensor (b) a gas sensor (c) a distance sensor (d) a sound sensor
28. 28.Which job needs a sound sensor? (a) make a parking alarm (b) switch on lamps at dusk (c) switch on with a clap (d) water a dry plant
29. 29.🔍 Which sensor would you use to make a parking alarm? (a) a soil moisture sensor (b) a distance sensor (c) a rain sensor (d) a gas sensor
30. 30.True or false: to switch on lamps at dusk, use a light sensor. (a) True (b) False
31. 31.🔍 A distance sensor sends a sound pulse and hears the echo 9 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
32. 32.⚙️ Which actuator would you use to show the temperature? (a) a motor (b) a servo motor (c) a display (d) a buzzer
33. 33.⚙️ Which actuator would you use to spin a robot’s wheels? (a) a pump (b) a motor (c) a buzzer (d) an LED
34. 34.🔍 An object is 306 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
35. 35.⚙️ Which actuator would you use to turn to an exact angle? (a) a servo motor (b) a pump (c) a motor (d) an LED
36. 36.🔍 An object is 238 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
37. 37.🔍 A distance sensor sends a sound pulse and hears the echo 10 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
38. 38.Which job needs a servo motor? (a) show the temperature (b) open a gate to 90° (c) beep an alarm (d) spin a robot’s wheels
39. 39.Which job needs a temperature sensor? (a) make a parking alarm (b) warn of a gas leak (c) keep an incubator warm (d) switch on lamps at dusk
40. 40.True or false: to open blinds at sunrise, use a light sensor. (a) True (b) False

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