Electronics Worksheet: Sensors and Actuators

Electronics lesson 26: Sensors and actuators · Set 148 · 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 gas sensor? (a) make a parking alarm (b) warn of a gas leak (c) water a dry plant (d) switch on with a clap
2. 2.🔍 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?
3. 3.⚙️ Which actuator would you use to open a gate to 90°? (a) a buzzer (b) a pump (c) a display (d) a servo motor
4. 4.🔍 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?
5. 5.True or false: to measure classroom noise, use a motion sensor. (a) False (b) True
6. 6.Which job needs a temperature sensor? (a) switch on with a clap (b) warn of a gas leak (c) switch on lamps at dusk (d) keep an incubator warm
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.True or false: to stop a robot near walls, use a temperature sensor. (a) True (b) False
9. 9.⚙️ Which actuator would you use to spin a robot’s wheels? (a) a pump (b) a display (c) an LED (d) a motor
10. 10.⚙️ Which actuator would you use to show a status light? (a) a display (b) an LED (c) a servo motor (d) a pump
11. 11.🔍 Which sensor would you use to warn of a gas leak? (a) a soil moisture sensor (b) a temperature sensor (c) a gas sensor (d) a sound sensor
12. 12.Which job needs a rain sensor? (a) stop a robot near walls (b) close a window in rain (c) switch on with a clap (d) warn of a gas leak
13. 13.🔍 An object is 170 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
14. 14.🔍 An object is 204 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
15. 15.🔍 For a microcontroller, is a sensor an input or an output? (a) a power source (b) a fuse (c) an input (d) an output
16. 16.Which job needs a sound sensor? (a) make a parking alarm (b) warn of a gas leak (c) switch on with a clap (d) spot someone walking in
17. 17.True or false: to switch on with a clap, use a light sensor. (a) False (b) True
18. 18.🔍 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?
19. 19.🔍 Which sensor would you use to keep an incubator warm? (a) a distance sensor (b) a motion sensor (c) a temperature sensor (d) a light sensor
20. 20.⚙️ Which actuator would you use to show the temperature? (a) a pump (b) a display (c) an LED (d) a servo motor
21. 21.🔍 Which sensor would you use to make a parking alarm? (a) a motion sensor (b) a light sensor (c) a rain sensor (d) a distance sensor
22. 22.Which job needs a motion sensor? (a) open blinds at sunrise (b) spot someone walking in (c) warn of a gas leak (d) stop a robot near walls
23. 23.🔍 Which sensor would you use to stop a robot near walls? (a) a motion sensor (b) a gas sensor (c) a light sensor (d) a distance sensor
24. 24.Which job needs a light sensor? (a) stop a robot near walls (b) make a parking alarm (c) measure classroom noise (d) open blinds at sunrise
25. 25.🔍 Which sensor would you use to water a dry plant? (a) a temperature sensor (b) a motion sensor (c) a sound sensor (d) a soil moisture sensor
26. 26.Which job needs a soil moisture sensor? (a) close a window in rain (b) keep an incubator warm (c) make a parking alarm (d) water a dry plant
27. 27.🔍 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?
28. 28.Which job needs a distance sensor? (a) spot someone walking in (b) stop a robot near walls (c) measure classroom noise (d) water a dry plant
29. 29.True or false: to make a parking alarm, use a motion sensor. (a) True (b) False
30. 30.⚙️ What is an actuator? (a) a sensor (b) a battery (c) a program (d) an output that acts
31. 31.Which job needs a servo motor? (a) beep an alarm (b) show the temperature (c) turn to an exact angle (d) move water to plants
32. 32.🔍 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)?
33. 33.🔍 A distance sensor sends a sound pulse and hears the echo 20 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
34. 34.⚙️ Which actuator would you use to beep an alarm? (a) a buzzer (b) a pump (c) a servo motor (d) a motor
35. 35.True or false: to switch on lamps at dusk, use a light sensor. (a) True (b) False
36. 36.Which job needs a motor? (a) spin a robot’s wheels (b) turn to an exact angle (c) beep an alarm (d) show a status light
37. 37.⚙️ Which actuator would you use to turn to an exact angle? (a) a buzzer (b) a motor (c) an LED (d) a servo motor
38. 38.🔍 Which sensor would you use to start a fan when hot? (a) a motion sensor (b) a temperature sensor (c) a gas sensor (d) a distance sensor
39. 39.Which job needs a pump? (a) spin a robot’s wheels (b) show the temperature (c) move water to plants (d) open a gate to 90°
40. 40.True or false: to close a window in rain, use a rain sensor. (a) True (b) False

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