Electronics Worksheet: Sensors and Actuators

Electronics lesson 26: Sensors and actuators · Set 14 · 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.True or false: to make a parking alarm, use a rain sensor. (a) True (b) False
2. 2.Which job needs a gas sensor? (a) stop a robot near walls (b) warn of a gas leak (c) start a fan when hot (d) measure classroom noise
3. 3.⚙️ Which actuator would you use to beep an alarm? (a) a servo motor (b) a motor (c) a buzzer (d) a pump
4. 4.🔍 Which sensor would you use to spot someone walking in? (a) a motion sensor (b) a distance sensor (c) a light sensor (d) a soil moisture sensor
5. 5.Which job needs a buzzer? (a) open a gate to 90° (b) beep an alarm (c) spin a robot’s wheels (d) move water to plants
6. 6.🔍 An object is 85 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
7. 7.Which job needs a soil moisture sensor? (a) water a dry plant (b) switch on lamps at dusk (c) open blinds at sunrise (d) warn of a gas leak
8. 8.True or false: to make a parking alarm, use a light sensor. (a) True (b) False
9. 9.🔍 Which sensor would you use to switch on lamps at dusk? (a) a gas sensor (b) a light sensor (c) a motion sensor (d) a sound sensor
10. 10.True or false: to warn of a gas leak, use a light sensor. (a) False (b) True
11. 11.True or false: to close a window in rain, use a temperature sensor. (a) True (b) False
12. 12.🔍 For a microcontroller, is a sensor an input or an output? (a) an input (b) an output (c) a fuse (d) a power source
13. 13.🔍 Which sensor would you use to make a parking alarm? (a) a temperature sensor (b) a motion sensor (c) a distance sensor (d) a light sensor
14. 14.Which job needs a motion sensor? (a) spot someone walking in (b) start a fan when hot (c) close a window in rain (d) stop a robot near walls
15. 15.🔍 A distance sensor sends a sound pulse and hears the echo 2 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
16. 16.Which job needs a temperature sensor? (a) open blinds at sunrise (b) close a window in rain (c) stop a robot near walls (d) start a fan when hot
17. 17.True or false: to water a dry plant, use a soil moisture sensor. (a) False (b) True
18. 18.True or false: to stop a robot near walls, use a temperature sensor. (a) True (b) False
19. 19.🔍 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)?
20. 20.⚙️ What is an actuator? (a) a sensor (b) a program (c) a battery (d) an output that acts
21. 21.🔍 An object is 187 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
22. 22.🔍 A distance sensor sends a sound pulse and hears the echo 3 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
23. 23.🔍 Which sensor would you use to stop a robot near walls? (a) a rain sensor (b) a motion sensor (c) a temperature sensor (d) a distance sensor
24. 24.Which job needs a light sensor? (a) measure classroom noise (b) switch on with a clap (c) start a fan when hot (d) open blinds at sunrise
25. 25.🔍 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?
26. 26.⚙️ Which actuator would you use to show the temperature? (a) a motor (b) a pump (c) a display (d) a buzzer
27. 27.Which job needs an LED? (a) move water to plants (b) open a gate to 90° (c) show a status light (d) show the temperature
28. 28.🔍 A distance sensor sends a sound pulse and hears the echo 5 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
29. 29.🔍 Which sensor would you use to start a fan when hot? (a) a light sensor (b) a distance sensor (c) a soil moisture sensor (d) a temperature sensor
30. 30.True or false: to switch on lamps at dusk, use a motion sensor. (a) True (b) False
31. 31.🔍 An object is 153 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
32. 32.⚙️ Which actuator would you use to spin a robot’s wheels? (a) a buzzer (b) an LED (c) a servo motor (d) a motor
33. 33.🔍 An object is 51 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
34. 34.True or false: to switch on lamps at dusk, use a light sensor. (a) False (b) True
35. 35.🔍 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)?
36. 36.⚙️ Which actuator would you use to move water to plants? (a) a pump (b) a servo motor (c) an LED (d) a display
37. 37.🔍 An object is 136 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
38. 38.True or false: to stop a robot near walls, use a distance sensor. (a) True (b) False
39. 39.🔍 A distance sensor sends a sound pulse and hears the echo 1 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
40. 40.Which job needs a servo motor? (a) move water to plants (b) beep an alarm (c) show a status light (d) open a gate to 90°

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