Electronics Worksheet: Sensors and Actuators

Electronics lesson 26: Sensors and actuators · Set 146 · 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 actuator would you use to move water to plants? (a) a display (b) a servo motor (c) a pump (d) an LED
2. 2.Which job needs a buzzer? (a) spin a robot’s wheels (b) open a gate to 90° (c) beep an alarm (d) show the temperature
3. 3.Which job needs a motion sensor? (a) switch on with a clap (b) switch on lamps at dusk (c) spot someone walking in (d) warn of a gas leak
4. 4.🔍 Which sensor would you use to open blinds at sunrise? (a) a rain sensor (b) a gas sensor (c) a light sensor (d) a soil moisture sensor
5. 5.🔍 A distance sensor sends a sound pulse and hears the echo 3 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
6. 6.Which job needs a pump? (a) spin a robot’s wheels (b) beep an alarm (c) turn to an exact angle (d) move water to plants
7. 7.🔍 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)?
8. 8.Which job needs a display? (a) show a status light (b) show the temperature (c) beep an alarm (d) spin a robot’s wheels
9. 9.Which job needs a temperature sensor? (a) water a dry plant (b) open blinds at sunrise (c) keep an incubator warm (d) switch on with a clap
10. 10.⚙️ Which actuator would you use to beep an alarm? (a) a buzzer (b) a servo motor (c) an LED (d) a display
11. 11.🔍 For a microcontroller, is a sensor an input or an output? (a) an input (b) an output (c) a fuse (d) a power source
12. 12.🔍 A distance sensor sends a sound pulse and hears the echo 19 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
13. 13.Which job needs a distance sensor? (a) stop a robot near walls (b) switch on lamps at dusk (c) measure classroom noise (d) open blinds at sunrise
14. 14.Which job needs a motor? (a) beep an alarm (b) show the temperature (c) open a gate to 90° (d) spin a robot’s wheels
15. 15.🔍 Which sensor would you use to close a window in rain? (a) a distance sensor (b) a light sensor (c) a motion sensor (d) a rain sensor
16. 16.🔍 Which sensor would you use to make a parking alarm? (a) a sound sensor (b) a light sensor (c) a temperature sensor (d) a distance sensor
17. 17.🔍 Which sensor would you use to water a dry plant? (a) a temperature sensor (b) a gas sensor (c) a soil moisture sensor (d) a sound sensor
18. 18.Which job needs an LED? (a) show a status light (b) open a gate to 90° (c) beep an alarm (d) spin a robot’s wheels
19. 19.🔍 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)?
20. 20.True or false: to water a dry plant, use a soil moisture sensor. (a) True (b) False
21. 21.Which job needs a soil moisture sensor? (a) keep an incubator warm (b) close a window in rain (c) measure classroom noise (d) water a dry plant
22. 22.Which job needs a light sensor? (a) make a parking alarm (b) open blinds at sunrise (c) keep an incubator warm (d) close a window in rain
23. 23.🔍 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)?
24. 24.Which job needs a sound sensor? (a) stop a robot near walls (b) switch on with a clap (c) keep an incubator warm (d) spot someone walking in
25. 25.🔍 Which sensor would you use to measure classroom noise? (a) a rain sensor (b) a sound sensor (c) a light sensor (d) a gas sensor
26. 26.True or false: to open blinds at sunrise, use a sound sensor. (a) True (b) False
27. 27.🔍 An object is 136 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
28. 28.True or false: to stop a robot near walls, use a distance sensor. (a) True (b) False
29. 29.True or false: to start a fan when hot, use a temperature sensor. (a) True (b) False
30. 30.True or false: to measure classroom noise, use a distance sensor. (a) True (b) False
31. 31.Which job needs a gas sensor? (a) switch on lamps at dusk (b) keep an incubator warm (c) stop a robot near walls (d) warn of a gas leak
32. 32.⚙️ What is an actuator? (a) a program (b) an output that acts (c) a sensor (d) a battery
33. 33.Which job needs a light sensor? (a) stop a robot near walls (b) start a fan when hot (c) warn of a gas leak (d) switch on lamps at dusk
34. 34.🔍 An object is 153 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
35. 35.Which job needs a distance sensor? (a) measure classroom noise (b) switch on with a clap (c) open blinds at sunrise (d) make a parking alarm
36. 36.True or false: to water a dry plant, use a sound sensor. (a) False (b) True
37. 37.⚙️ Which actuator would you use to show the temperature? (a) a servo motor (b) an LED (c) a display (d) a motor
38. 38.🔍 Which sensor would you use to start a fan when hot? (a) a temperature sensor (b) a motion sensor (c) a gas sensor (d) a light sensor
39. 39.🔍 An object is 289 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
40. 40.True or false: to stop a robot near walls, use a gas sensor. (a) True (b) False

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