Electronics Worksheet: Sensors and Actuators

Electronics lesson 26: Sensors and actuators · Set 266 · 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.True or false: to start a fan when hot, use a temperature sensor. (a) True (b) False
2. 2.True or false: to open blinds at sunrise, use a rain sensor. (a) True (b) False
3. 3.Which job needs a motor? (a) show the temperature (b) spin a robot’s wheels (c) move water to plants (d) turn to an exact angle
4. 4.True or false: to stop a robot near walls, use a distance sensor. (a) True (b) False
5. 5.🔍 Which sensor would you use to water a dry plant? (a) a rain sensor (b) a soil moisture sensor (c) a gas sensor (d) a sound sensor
6. 6.Which job needs a soil moisture sensor? (a) warn of a gas leak (b) open blinds at sunrise (c) water a dry plant (d) measure classroom noise
7. 7.True or false: to switch on lamps at dusk, use a sound sensor. (a) True (b) False
8. 8.Which job needs a buzzer? (a) spin a robot’s wheels (b) move water to plants (c) beep an alarm (d) show a status light
9. 9.Which job needs a display? (a) beep an alarm (b) move water to plants (c) show the temperature (d) open a gate to 90°
10. 10.True or false: to switch on lamps at dusk, use a light sensor. (a) True (b) False
11. 11.True or false: to stop a robot near walls, use a soil moisture sensor. (a) False (b) True
12. 12.True or false: to close a window in rain, use a rain sensor. (a) False (b) True
13. 13.Which job needs a pump? (a) beep an alarm (b) move water to plants (c) show a status light (d) spin a robot’s wheels
14. 14.🔍 A distance sensor sends a sound pulse and hears the echo 2 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
15. 15.Which job needs a light sensor? (a) warn of a gas leak (b) open blinds at sunrise (c) spot someone walking in (d) measure classroom noise
16. 16.Which job needs a servo motor? (a) show the temperature (b) beep an alarm (c) open a gate to 90° (d) show a status light
17. 17.🔍 Which sensor would you use to make a parking alarm? (a) a distance sensor (b) a motion sensor (c) a sound sensor (d) a temperature sensor
18. 18.🔍 Which sensor would you use to start a fan when hot? (a) a light sensor (b) a sound sensor (c) a distance sensor (d) a temperature sensor
19. 19.⚙️ What is an actuator? (a) a sensor (b) a battery (c) a program (d) an output that acts
20. 20.⚙️ Which actuator would you use to spin a robot’s wheels? (a) an LED (b) a motor (c) a buzzer (d) a pump
21. 21.🔍 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?
22. 22.⚙️ Which actuator would you use to open a gate to 90°? (a) a servo motor (b) a display (c) an LED (d) a motor
23. 23.⚙️ Which actuator would you use to turn to an exact angle? (a) an LED (b) a motor (c) a buzzer (d) a servo motor
24. 24.Which job needs an LED? (a) open a gate to 90° (b) show a status light (c) show the temperature (d) move water to plants
25. 25.Which job needs a temperature sensor? (a) open blinds at sunrise (b) start a fan when hot (c) spot someone walking in (d) stop a robot near walls
26. 26.🔍 For a microcontroller, is a sensor an input or an output? (a) a fuse (b) an output (c) an input (d) a power source
27. 27.⚙️ Which actuator would you use to show a status light? (a) a motor (b) a buzzer (c) an LED (d) a servo motor
28. 28.⚙️ Which actuator would you use to move water to plants? (a) a buzzer (b) a motor (c) an LED (d) a pump
29. 29.🔍 Which sensor would you use to warn of a gas leak? (a) a sound sensor (b) a motion sensor (c) a gas sensor (d) a light sensor
30. 30.Which job needs a gas sensor? (a) make a parking alarm (b) close a window in rain (c) warn of a gas leak (d) keep an incubator warm
31. 31.🔍 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)?
32. 32.🔍 Which sensor would you use to spot someone walking in? (a) a rain sensor (b) a temperature sensor (c) a distance sensor (d) a motion sensor
33. 33.🔍 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?
34. 34.🔍 Which sensor would you use to keep an incubator warm? (a) a light sensor (b) a temperature sensor (c) a motion sensor (d) a rain sensor
35. 35.🔍 Which sensor would you use to stop a robot near walls? (a) a distance sensor (b) a motion sensor (c) a soil moisture sensor (d) a temperature sensor
36. 36.True or false: to switch on with a clap, use a soil moisture sensor. (a) False (b) True
37. 37.Which job needs a light sensor? (a) warn of a gas leak (b) measure classroom noise (c) start a fan when hot (d) switch on lamps at dusk
38. 38.True or false: to spot someone walking in, use a motion sensor. (a) True (b) False
39. 39.🔍 An object is 323 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 switch on lamps at dusk, use a temperature sensor. (a) False (b) True

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