Electronics Worksheet: Sensors and Actuators

Electronics lesson 26: Sensors and actuators · Set 198 · 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 display? (a) turn to an exact angle (b) show the temperature (c) open a gate to 90° (d) beep an alarm
2. 2.Which job needs a temperature sensor? (a) measure classroom noise (b) switch on lamps at dusk (c) start a fan when hot (d) stop a robot near walls
3. 3.🔍 For a microcontroller, is a sensor an input or an output? (a) an input (b) an output (c) a power source (d) a fuse
4. 4.Which job needs a servo motor? (a) show a status light (b) show the temperature (c) spin a robot’s wheels (d) turn to an exact angle
5. 5.🔍 Which sensor would you use to spot someone walking in? (a) a motion sensor (b) a gas sensor (c) a soil moisture sensor (d) a sound sensor
6. 6.Which job needs a temperature sensor? (a) open blinds at sunrise (b) keep an incubator warm (c) measure classroom noise (d) switch on lamps at dusk
7. 7.🔍 An object is 272 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
8. 8.Which job needs a servo motor? (a) show the temperature (b) beep an alarm (c) move water to plants (d) open a gate to 90°
9. 9.True or false: to start a fan when hot, use a gas sensor. (a) False (b) True
10. 10.🔍 Which sensor would you use to start a fan when hot? (a) a soil moisture sensor (b) a motion sensor (c) a temperature sensor (d) a gas sensor
11. 11.🔍 A distance sensor sends a sound pulse and hears the echo 12 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
12. 12.Which job needs a buzzer? (a) beep an alarm (b) spin a robot’s wheels (c) move water to plants (d) show a status light
13. 13.Which job needs a soil moisture sensor? (a) water a dry plant (b) switch on lamps at dusk (c) make a parking alarm (d) switch on with a clap
14. 14.🔍 Which sensor would you use to switch on with a clap? (a) a temperature sensor (b) a sound sensor (c) a light sensor (d) a motion sensor
15. 15.⚙️ What is an actuator? (a) a sensor (b) a battery (c) a program (d) an output that acts
16. 16.🔍 An object is 102 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
17. 17.🔍 Which sensor would you use to switch on lamps at dusk? (a) a motion sensor (b) a rain sensor (c) a light sensor (d) a gas sensor
18. 18.⚙️ Which actuator would you use to show the temperature? (a) a display (b) a motor (c) a pump (d) an LED
19. 19.🔍 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)?
20. 20.⚙️ Which actuator would you use to spin a robot’s wheels? (a) a buzzer (b) a servo motor (c) a display (d) a motor
21. 21.True or false: to start a fan when hot, use a temperature sensor. (a) True (b) False
22. 22.⚙️ Which actuator would you use to open a gate to 90°? (a) a servo motor (b) a motor (c) a buzzer (d) a pump
23. 23.⚙️ Which actuator would you use to move water to plants? (a) an LED (b) a pump (c) a servo motor (d) a motor
24. 24.True or false: to switch on lamps at dusk, use a gas sensor. (a) True (b) False
25. 25.Which job needs an LED? (a) beep an alarm (b) show a status light (c) spin a robot’s wheels (d) move water to plants
26. 26.🔍 Which sensor would you use to close a window in rain? (a) a sound sensor (b) a rain sensor (c) a light sensor (d) a gas sensor
27. 27.Which job needs a gas sensor? (a) warn of a gas leak (b) stop a robot near walls (c) switch on with a clap (d) water a dry plant
28. 28.True or false: to open blinds at sunrise, use a temperature sensor. (a) True (b) False
29. 29.Which job needs a pump? (a) spin a robot’s wheels (b) beep an alarm (c) move water to plants (d) open a gate to 90°
30. 30.True or false: to open blinds at sunrise, use a light sensor. (a) False (b) True
31. 31.True or false: to open blinds at sunrise, use a soil moisture sensor. (a) False (b) True
32. 32.⚙️ Which actuator would you use to turn to an exact angle? (a) a motor (b) an LED (c) a servo motor (d) a pump
33. 33.Which job needs a motor? (a) spin a robot’s wheels (b) open a gate to 90° (c) turn to an exact angle (d) move water to plants
34. 34.🔍 An object is 119 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 show a status light? (a) a pump (b) an LED (c) a motor (d) a servo motor
36. 36.🔍 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)?
37. 37.🔍 Which sensor would you use to open blinds at sunrise? (a) a soil moisture sensor (b) a temperature sensor (c) a motion sensor (d) a light sensor
38. 38.🔍 A distance sensor sends a sound pulse and hears the echo 15 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
39. 39.🔍 Which sensor would you use to water a dry plant? (a) a soil moisture sensor (b) a motion sensor (c) a rain sensor (d) a sound sensor
40. 40.True or false: to warn of a gas leak, use a distance sensor. (a) True (b) False

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