Electronics Worksheet: Sensors and Actuators

Electronics lesson 26: Sensors and actuators · Set 201 · 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 sensor would you use to warn of a gas leak? (a) a light sensor (b) a distance sensor (c) a sound sensor (d) a gas sensor
2. 2.Which job needs a display? (a) move water to plants (b) turn to an exact angle (c) show the temperature (d) spin a robot’s wheels
3. 3.⚙️ Which actuator would you use to show the temperature? (a) a motor (b) a servo motor (c) a pump (d) a display
4. 4.Which job needs a distance sensor? (a) open blinds at sunrise (b) water a dry plant (c) switch on lamps at dusk (d) make a parking alarm
5. 5.🔍 Which sensor would you use to close a window in rain? (a) a rain sensor (b) a light sensor (c) a motion sensor (d) a sound sensor
6. 6.Which job needs a rain sensor? (a) warn of a gas leak (b) switch on with a clap (c) switch on lamps at dusk (d) close a window in rain
7. 7.True or false: to measure classroom noise, use a sound sensor. (a) False (b) True
8. 8.🔍 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?
9. 9.🔍 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)?
10. 10.🔍 Which sensor would you use to keep an incubator warm? (a) a distance sensor (b) a sound sensor (c) a temperature sensor (d) a light sensor
11. 11.🔍 A distance sensor sends a sound pulse and hears the echo 14 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
12. 12.🔍 Which sensor would you use to switch on lamps at dusk? (a) a soil moisture sensor (b) a rain sensor (c) a temperature sensor (d) a light sensor
13. 13.⚙️ Which actuator would you use to open a gate to 90°? (a) a buzzer (b) a servo motor (c) a display (d) a pump
14. 14.True or false: to switch on lamps at dusk, use a sound sensor. (a) True (b) False
15. 15.Which job needs a servo motor? (a) show the temperature (b) show a status light (c) spin a robot’s wheels (d) turn to an exact angle
16. 16.🔍 For a microcontroller, is a sensor an input or an output? (a) a power source (b) an input (c) a fuse (d) an output
17. 17.True or false: to keep an incubator warm, use a temperature sensor. (a) True (b) False
18. 18.Which job needs a light sensor? (a) warn of a gas leak (b) keep an incubator warm (c) start a fan when hot (d) open blinds at sunrise
19. 19.⚙️ What is an actuator? (a) a sensor (b) an output that acts (c) a battery (d) a program
20. 20.🔍 An object is 221 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
21. 21.🔍 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?
22. 22.Which job needs a soil moisture sensor? (a) make a parking alarm (b) warn of a gas leak (c) water a dry plant (d) start a fan when hot
23. 23.⚙️ Which actuator would you use to move water to plants? (a) a servo motor (b) a pump (c) an LED (d) a motor
24. 24.True or false: to close a window in rain, use a rain sensor. (a) False (b) True
25. 25.Which job needs a sound sensor? (a) make a parking alarm (b) switch on with a clap (c) keep an incubator warm (d) open blinds at sunrise
26. 26.True or false: to switch on lamps at dusk, use a gas sensor. (a) True (b) False
27. 27.True or false: to water a dry plant, use a temperature sensor. (a) False (b) True
28. 28.🔍 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?
29. 29.Which job needs a servo motor? (a) open a gate to 90° (b) spin a robot’s wheels (c) move water to plants (d) show the temperature
30. 30.Which job needs a gas sensor? (a) warn of a gas leak (b) open blinds at sunrise (c) spot someone walking in (d) switch on with a clap
31. 31.Which job needs a buzzer? (a) move water to plants (b) beep an alarm (c) show a status light (d) turn to an exact angle
32. 32.True or false: to switch on lamps at dusk, use a light sensor. (a) False (b) True
33. 33.Which job needs a light sensor? (a) switch on lamps at dusk (b) warn of a gas leak (c) make a parking alarm (d) water a dry plant
34. 34.🔍 Which sensor would you use to make a parking alarm? (a) a gas sensor (b) a soil moisture sensor (c) a distance sensor (d) a rain sensor
35. 35.True or false: to water a dry plant, use a soil moisture sensor. (a) True (b) False
36. 36.🔍 An object is 17 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
37. 37.True or false: to switch on with a clap, use a rain sensor. (a) False (b) True
38. 38.⚙️ Which actuator would you use to spin a robot’s wheels? (a) a display (b) a servo motor (c) a motor (d) a pump
39. 39.🔍 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)?
40. 40.Which job needs a temperature sensor? (a) measure classroom noise (b) water a dry plant (c) stop a robot near walls (d) keep an incubator warm

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