Electronics Worksheet: Sensors and Actuators

Electronics lesson 26: Sensors and actuators · Set 153 · 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) show the temperature (b) turn to an exact angle (c) open a gate to 90° (d) move water to plants
2. 2.Which job needs a soil moisture sensor? (a) stop a robot near walls (b) water a dry plant (c) keep an incubator warm (d) warn of a gas leak
3. 3.⚙️ What is an actuator? (a) a battery (b) a sensor (c) a program (d) an output that acts
4. 4.🔍 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?
5. 5.Which job needs a light sensor? (a) switch on with a clap (b) keep an incubator warm (c) spot someone walking in (d) open blinds at sunrise
6. 6.True or false: to water a dry plant, use a distance sensor. (a) False (b) True
7. 7.🔍 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)?
8. 8.🔍 Which sensor would you use to open blinds at sunrise? (a) a rain sensor (b) a light sensor (c) a soil moisture sensor (d) a motion sensor
9. 9.⚙️ Which actuator would you use to show a status light? (a) a motor (b) a pump (c) a buzzer (d) an LED
10. 10.🔍 A distance sensor sends a sound pulse and hears the echo 6 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
11. 11.Which job needs a sound sensor? (a) make a parking alarm (b) switch on with a clap (c) water a dry plant (d) warn of a gas leak
12. 12.True or false: to keep an incubator warm, use a sound sensor. (a) True (b) False
13. 13.⚙️ Which actuator would you use to turn to an exact angle? (a) a buzzer (b) a display (c) a servo motor (d) an LED
14. 14.True or false: to switch on with a clap, use a soil moisture sensor. (a) False (b) True
15. 15.True or false: to measure classroom noise, use a sound sensor. (a) False (b) True
16. 16.True or false: to spot someone walking in, use a motion sensor. (a) True (b) False
17. 17.🔍 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?
18. 18.True or false: to switch on with a clap, use a sound sensor. (a) False (b) True
19. 19.🔍 Which sensor would you use to keep an incubator warm? (a) a temperature sensor (b) a soil moisture sensor (c) a light sensor (d) a motion sensor
20. 20.⚙️ Which actuator would you use to open a gate to 90°? (a) a servo motor (b) a pump (c) a display (d) an LED
21. 21.🔍 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?
22. 22.🔍 For a microcontroller, is a sensor an input or an output? (a) a power source (b) an output (c) an input (d) a fuse
23. 23.🔍 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?
24. 24.Which job needs a pump? (a) show the temperature (b) move water to plants (c) spin a robot’s wheels (d) show a status light
25. 25.True or false: to switch on with a clap, use a gas sensor. (a) False (b) True
26. 26.Which job needs a motor? (a) turn to an exact angle (b) move water to plants (c) beep an alarm (d) spin a robot’s wheels
27. 27.True or false: to start a fan when hot, use a distance sensor. (a) False (b) True
28. 28.True or false: to warn of a gas leak, use a motion sensor. (a) True (b) False
29. 29.True or false: to start a fan when hot, use a rain sensor. (a) False (b) True
30. 30.True or false: to close a window in rain, use a soil moisture sensor. (a) False (b) True
31. 31.Which job needs a servo motor? (a) spin a robot’s wheels (b) move water to plants (c) turn to an exact angle (d) beep an alarm
32. 32.🔍 Which sensor would you use to stop a robot near walls? (a) a soil moisture sensor (b) a distance sensor (c) a light sensor (d) a gas sensor
33. 33.🔍 A distance sensor sends a sound pulse and hears the echo 1 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
34. 34.True or false: to warn of a gas leak, use a gas sensor. (a) True (b) False
35. 35.🔍 Which sensor would you use to water a dry plant? (a) a sound sensor (b) a light sensor (c) a soil moisture sensor (d) a motion sensor
36. 36.Which job needs a distance sensor? (a) open blinds at sunrise (b) switch on lamps at dusk (c) measure classroom noise (d) make a parking alarm
37. 37.Which job needs a buzzer? (a) turn to an exact angle (b) open a gate to 90° (c) beep an alarm (d) move water to plants
38. 38.Which job needs a motion sensor? (a) spot someone walking in (b) start a fan when hot (c) measure classroom noise (d) make a parking alarm
39. 39.Which job needs an LED? (a) move water to plants (b) spin a robot’s wheels (c) beep an alarm (d) show a status light
40. 40.Which job needs a distance sensor? (a) stop a robot near walls (b) start a fan when hot (c) keep an incubator warm (d) water a dry plant

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