Electronics Worksheet: Sensors and Actuators

Electronics lesson 26: Sensors and actuators · Set 188 · 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 light sensor? (a) keep an incubator warm (b) start a fan when hot (c) switch on lamps at dusk (d) water a dry plant
2. 2.Which job needs a servo motor? (a) spin a robot’s wheels (b) open a gate to 90° (c) move water to plants (d) show a status light
3. 3.⚙️ What is an actuator? (a) a program (b) a sensor (c) an output that acts (d) a battery
4. 4.True or false: to measure classroom noise, use a sound sensor. (a) False (b) True
5. 5.True or false: to close a window in rain, use a rain sensor. (a) True (b) False
6. 6.🔍 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)?
7. 7.🔍 Which sensor would you use to spot someone walking in? (a) a temperature sensor (b) a motion sensor (c) a gas sensor (d) a distance sensor
8. 8.🔍 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?
9. 9.⚙️ Which actuator would you use to turn to an exact angle? (a) a display (b) a buzzer (c) a motor (d) a servo motor
10. 10.🔍 For a microcontroller, is a sensor an input or an output? (a) an output (b) an input (c) a power source (d) a fuse
11. 11.⚙️ Which actuator would you use to show the temperature? (a) a buzzer (b) a servo motor (c) an LED (d) a display
12. 12.🔍 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)?
13. 13.🔍 A distance sensor sends a sound pulse and hears the echo 9 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
14. 14.🔍 Which sensor would you use to switch on lamps at dusk? (a) a distance sensor (b) a gas sensor (c) a sound sensor (d) a light sensor
15. 15.🔍 Which sensor would you use to open blinds at sunrise? (a) a soil moisture sensor (b) a temperature sensor (c) a light sensor (d) a distance sensor
16. 16.Which job needs a pump? (a) show a status light (b) show the temperature (c) move water to plants (d) turn to an exact angle
17. 17.True or false: to stop a robot near walls, use a distance sensor. (a) False (b) True
18. 18.True or false: to water a dry plant, use a distance sensor. (a) False (b) True
19. 19.Which job needs an LED? (a) move water to plants (b) show a status light (c) spin a robot’s wheels (d) open a gate to 90°
20. 20.Which job needs a soil moisture sensor? (a) water a dry plant (b) measure classroom noise (c) switch on with a clap (d) close a window in rain
21. 21.True or false: to switch on with a clap, use a sound sensor. (a) True (b) False
22. 22.True or false: to warn of a gas leak, use a gas sensor. (a) True (b) False
23. 23.🔍 Which sensor would you use to start a fan when hot? (a) a temperature sensor (b) a motion sensor (c) a soil moisture sensor (d) a distance sensor
24. 24.True or false: to keep an incubator warm, use a motion sensor. (a) False (b) True
25. 25.🔍 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?
26. 26.🔍 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)?
27. 27.Which job needs a sound sensor? (a) spot someone walking in (b) stop a robot near walls (c) make a parking alarm (d) switch on with a clap
28. 28.⚙️ Which actuator would you use to open a gate to 90°? (a) a display (b) a servo motor (c) an LED (d) a motor
29. 29.⚙️ Which actuator would you use to move water to plants? (a) a servo motor (b) a display (c) an LED (d) a pump
30. 30.Which job needs a motor? (a) turn to an exact angle (b) spin a robot’s wheels (c) show the temperature (d) show a status light
31. 31.🔍 Which sensor would you use to keep an incubator warm? (a) a light sensor (b) a motion sensor (c) a temperature sensor (d) a rain sensor
32. 32.🔍 Which sensor would you use to water a dry plant? (a) a distance sensor (b) a soil moisture sensor (c) a rain sensor (d) a light sensor
33. 33.Which job needs a rain sensor? (a) make a parking alarm (b) spot someone walking in (c) warn of a gas leak (d) close a window in rain
34. 34.🔍 An object is 187 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 display? (a) show the temperature (b) open a gate to 90° (c) move water to plants (d) beep an alarm
36. 36.Which job needs a distance sensor? (a) warn of a gas leak (b) keep an incubator warm (c) switch on lamps at dusk (d) make a parking alarm
37. 37.Which job needs a motion sensor? (a) measure classroom noise (b) spot someone walking in (c) close a window in rain (d) switch on lamps at dusk
38. 38.Which job needs a distance sensor? (a) water a dry plant (b) measure classroom noise (c) stop a robot near walls (d) close a window in rain
39. 39.🔍 Which sensor would you use to close a window in rain? (a) a gas sensor (b) a rain sensor (c) a soil moisture sensor (d) a sound sensor
40. 40.True or false: to stop a robot near walls, use a gas sensor. (a) True (b) False

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