Electronics Worksheet: Sensors and Actuators

Electronics lesson 26: Sensors and actuators · Set 139 · 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) beep an alarm (b) show the temperature (c) move water to plants (d) spin a robot’s wheels
2. 2.Which job needs a sound sensor? (a) keep an incubator warm (b) start a fan when hot (c) switch on lamps at dusk (d) measure classroom noise
3. 3.🔍 Which sensor would you use to keep an incubator warm? (a) a soil moisture sensor (b) a sound sensor (c) a temperature sensor (d) a light sensor
4. 4.Which job needs a sound sensor? (a) open blinds at sunrise (b) switch on lamps at dusk (c) close a window in rain (d) switch on with a clap
5. 5.True or false: to switch on lamps at dusk, use a sound sensor. (a) True (b) False
6. 6.Which job needs a gas sensor? (a) start a fan when hot (b) stop a robot near walls (c) open blinds at sunrise (d) warn of a gas leak
7. 7.True or false: to measure classroom noise, use a sound sensor. (a) True (b) False
8. 8.Which job needs a buzzer? (a) beep an alarm (b) spin a robot’s wheels (c) show a status light (d) show the temperature
9. 9.Which job needs a motor? (a) move water to plants (b) show the temperature (c) spin a robot’s wheels (d) turn to an exact angle
10. 10.🔍 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)?
11. 11.Which job needs a temperature sensor? (a) switch on with a clap (b) stop a robot near walls (c) start a fan when hot (d) water a dry plant
12. 12.🔍 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)?
13. 13.⚙️ Which actuator would you use to beep an alarm? (a) a servo motor (b) a motor (c) a buzzer (d) a pump
14. 14.🔍 Which sensor would you use to close a window in rain? (a) a temperature sensor (b) a rain sensor (c) a sound sensor (d) a soil moisture sensor
15. 15.⚙️ Which actuator would you use to spin a robot’s wheels? (a) a display (b) a motor (c) a servo motor (d) an LED
16. 16.⚙️ Which actuator would you use to show a status light? (a) a buzzer (b) a pump (c) an LED (d) a display
17. 17.🔍 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)?
18. 18.🔍 A distance sensor sends a sound pulse and hears the echo 4 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
19. 19.🔍 For a microcontroller, is a sensor an input or an output? (a) a fuse (b) an output (c) an input (d) a power source
20. 20.True or false: to switch on with a clap, use a temperature sensor. (a) False (b) True
21. 21.True or false: to stop a robot near walls, use a rain sensor. (a) False (b) True
22. 22.⚙️ Which actuator would you use to turn to an exact angle? (a) a servo motor (b) a display (c) a pump (d) a buzzer
23. 23.True or false: to warn of a gas leak, use a distance sensor. (a) False (b) True
24. 24.🔍 A distance sensor sends a sound pulse and hears the echo 7 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
25. 25.🔍 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?
26. 26.🔍 Which sensor would you use to start a fan when hot? (a) a temperature sensor (b) a rain sensor (c) a light sensor (d) a gas sensor
27. 27.🔍 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?
28. 28.🔍 Which sensor would you use to switch on with a clap? (a) a gas sensor (b) a motion sensor (c) a soil moisture sensor (d) a sound sensor
29. 29.🔍 Which sensor would you use to open blinds at sunrise? (a) a light sensor (b) a gas sensor (c) a soil moisture sensor (d) a temperature sensor
30. 30.Which job needs a soil moisture sensor? (a) warn of a gas leak (b) spot someone walking in (c) start a fan when hot (d) water a dry plant
31. 31.⚙️ Which actuator would you use to open a gate to 90°? (a) a servo motor (b) an LED (c) a display (d) a buzzer
32. 32.True or false: to open blinds at sunrise, use a temperature sensor. (a) False (b) True
33. 33.Which job needs a distance sensor? (a) keep an incubator warm (b) measure classroom noise (c) make a parking alarm (d) start a fan when hot
34. 34.Which job needs an LED? (a) open a gate to 90° (b) spin a robot’s wheels (c) turn to an exact angle (d) show a status light
35. 35.🔍 Which sensor would you use to switch on lamps at dusk? (a) a motion sensor (b) a light sensor (c) a soil moisture sensor (d) a gas sensor
36. 36.True or false: to close a window in rain, use a rain sensor. (a) True (b) False
37. 37.⚙️ Which actuator would you use to move water to plants? (a) a servo motor (b) an LED (c) a pump (d) a motor
38. 38.Which job needs a light sensor? (a) measure classroom noise (b) switch on lamps at dusk (c) keep an incubator warm (d) warn of a gas leak
39. 39.🔍 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?
40. 40.🔍 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?

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