Electronics Worksheet: Sensors and Actuators

Electronics lesson 26: Sensors and actuators · Set 70 · 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 open blinds at sunrise? (a) a distance sensor (b) a gas sensor (c) a temperature sensor (d) a light sensor
2. 2.🔍 Which sensor would you use to start a fan when hot? (a) a motion sensor (b) a distance sensor (c) a sound sensor (d) a temperature sensor
3. 3.⚙️ Which actuator would you use to beep an alarm? (a) a servo motor (b) a motor (c) a pump (d) a buzzer
4. 4.True or false: to switch on lamps at dusk, use a light sensor. (a) False (b) True
5. 5.True or false: to warn of a gas leak, use a soil moisture sensor. (a) False (b) True
6. 6.⚙️ Which actuator would you use to move water to plants? (a) a motor (b) a display (c) a buzzer (d) a pump
7. 7.Which job needs a light sensor? (a) warn of a gas leak (b) measure classroom noise (c) switch on lamps at dusk (d) start a fan when hot
8. 8.⚙️ What is an actuator? (a) a sensor (b) an output that acts (c) a battery (d) a program
9. 9.🔍 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?
10. 10.Which job needs a pump? (a) turn to an exact angle (b) show a status light (c) show the temperature (d) move water to plants
11. 11.🔍 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?
12. 12.⚙️ Which actuator would you use to turn to an exact angle? (a) a pump (b) a buzzer (c) a motor (d) a servo motor
13. 13.Which job needs a servo motor? (a) show the temperature (b) turn to an exact angle (c) spin a robot’s wheels (d) show a status light
14. 14.Which job needs a display? (a) show the temperature (b) move water to plants (c) spin a robot’s wheels (d) show a status light
15. 15.Which job needs a sound sensor? (a) stop a robot near walls (b) measure classroom noise (c) switch on lamps at dusk (d) water a dry plant
16. 16.True or false: to water a dry plant, use a distance sensor. (a) False (b) True
17. 17.Which job needs a temperature sensor? (a) start a fan when hot (b) close a window in rain (c) stop a robot near walls (d) open blinds at sunrise
18. 18.True or false: to keep an incubator warm, use a motion sensor. (a) True (b) False
19. 19.🔍 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)?
20. 20.🔍 Which sensor would you use to keep an incubator warm? (a) a motion sensor (b) a soil moisture sensor (c) a rain sensor (d) a temperature sensor
21. 21.🔍 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)?
22. 22.🔍 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)?
23. 23.🔍 An object is 68 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
24. 24.🔍 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)?
25. 25.Which job needs a buzzer? (a) beep an alarm (b) spin a robot’s wheels (c) show a status light (d) move water to plants
26. 26.🔍 For a microcontroller, is a sensor an input or an output? (a) an output (b) a fuse (c) a power source (d) an input
27. 27.🔍 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)?
28. 28.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
29. 29.Which job needs a sound sensor? (a) switch on with a clap (b) spot someone walking in (c) stop a robot near walls (d) warn of a gas leak
30. 30.Which job needs a distance sensor? (a) keep an incubator warm (b) switch on lamps at dusk (c) stop a robot near walls (d) switch on with a clap
31. 31.True or false: to make a parking alarm, use a motion sensor. (a) True (b) False
32. 32.Which job needs a gas sensor? (a) warn of a gas leak (b) keep an incubator warm (c) stop a robot near walls (d) measure classroom noise
33. 33.⚙️ Which actuator would you use to spin a robot’s wheels? (a) a buzzer (b) an LED (c) a display (d) a motor
34. 34.🔍 Which sensor would you use to warn of a gas leak? (a) a soil moisture sensor (b) a temperature sensor (c) a distance sensor (d) a gas sensor
35. 35.🔍 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?
36. 36.True or false: to open blinds at sunrise, use a light sensor. (a) False (b) True
37. 37.True or false: to water a dry plant, use a light sensor. (a) True (b) False
38. 38.🔍 Which sensor would you use to switch on with a clap? (a) a sound sensor (b) a light sensor (c) a gas sensor (d) a temperature sensor
39. 39.⚙️ Which actuator would you use to show the temperature? (a) a servo motor (b) a motor (c) a buzzer (d) a display
40. 40.⚙️ Which actuator would you use to open a gate to 90°? (a) a servo motor (b) a display (c) a buzzer (d) an LED

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