Electronics Worksheet: Sensors and Actuators

Electronics lesson 26: Sensors and actuators · Set 181 · 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.🔍 For a microcontroller, is a sensor an input or an output? (a) an output (b) a power source (c) a fuse (d) an input
2. 2.🔍 Which sensor would you use to open blinds at sunrise? (a) a gas sensor (b) a motion sensor (c) a light sensor (d) a soil moisture sensor
3. 3.Which job needs a temperature sensor? (a) make a parking alarm (b) start a fan when hot (c) close a window in rain (d) stop a robot near walls
4. 4.Which job needs a light sensor? (a) stop a robot near walls (b) warn of a gas leak (c) switch on lamps at dusk (d) start a fan when hot
5. 5.⚙️ What is an actuator? (a) a battery (b) a program (c) an output that acts (d) a sensor
6. 6.Which job needs a servo motor? (a) spin a robot’s wheels (b) move water to plants (c) open a gate to 90° (d) show the temperature
7. 7.True or false: to warn of a gas leak, use a distance sensor. (a) True (b) False
8. 8.🔍 Which sensor would you use to keep an incubator warm? (a) a distance sensor (b) a temperature sensor (c) a soil moisture sensor (d) a gas sensor
9. 9.🔍 An object is 119 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
10. 10.🔍 Which sensor would you use to start a fan when hot? (a) a soil moisture sensor (b) a light sensor (c) a motion sensor (d) a temperature sensor
11. 11.⚙️ Which actuator would you use to spin a robot’s wheels? (a) a buzzer (b) a servo motor (c) a pump (d) a motor
12. 12.⚙️ Which actuator would you use to open a gate to 90°? (a) a pump (b) a buzzer (c) a servo motor (d) an LED
13. 13.True or false: to keep an incubator warm, use a motion sensor. (a) False (b) True
14. 14.🔍 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)?
15. 15.🔍 Which sensor would you use to switch on with a clap? (a) a light sensor (b) a soil moisture sensor (c) a distance sensor (d) a sound sensor
16. 16.⚙️ Which actuator would you use to turn to an exact angle? (a) an LED (b) a buzzer (c) a servo motor (d) a pump
17. 17.🔍 Which sensor would you use to stop a robot near walls? (a) a soil moisture sensor (b) a temperature sensor (c) a distance sensor (d) a rain sensor
18. 18.Which job needs a motion sensor? (a) open blinds at sunrise (b) start a fan when hot (c) water a dry plant (d) spot someone walking in
19. 19.True or false: to warn of a gas leak, use a motion sensor. (a) True (b) False
20. 20.Which job needs a rain sensor? (a) measure classroom noise (b) start a fan when hot (c) open blinds at sunrise (d) close a window in rain
21. 21.True or false: to make a parking alarm, use a motion sensor. (a) True (b) False
22. 22.🔍 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?
23. 23.Which job needs an LED? (a) spin a robot’s wheels (b) turn to an exact angle (c) show a status light (d) open a gate to 90°
24. 24.🔍 Which sensor would you use to spot someone walking in? (a) a motion sensor (b) a temperature sensor (c) a soil moisture sensor (d) a rain sensor
25. 25.🔍 Which sensor would you use to make a parking alarm? (a) a distance sensor (b) a temperature sensor (c) a light sensor (d) a gas sensor
26. 26.🔍 Which sensor would you use to warn of a gas leak? (a) a light sensor (b) a gas sensor (c) a soil moisture sensor (d) a distance sensor
27. 27.🔍 Which sensor would you use to switch on lamps at dusk? (a) a distance sensor (b) a light sensor (c) a sound sensor (d) a rain sensor
28. 28.True or false: to water a dry plant, use a soil moisture sensor. (a) True (b) False
29. 29.Which job needs a display? (a) turn to an exact angle (b) beep an alarm (c) show a status light (d) show the temperature
30. 30.⚙️ Which actuator would you use to move water to plants? (a) a display (b) a motor (c) a pump (d) an LED
31. 31.True or false: to spot someone walking in, use a motion sensor. (a) True (b) False
32. 32.Which job needs a light sensor? (a) water a dry plant (b) start a fan when hot (c) open blinds at sunrise (d) keep an incubator warm
33. 33.Which job needs a gas sensor? (a) water a dry plant (b) spot someone walking in (c) warn of a gas leak (d) make a parking alarm
34. 34.Which job needs a pump? (a) turn to an exact angle (b) show a status light (c) move water to plants (d) beep an alarm
35. 35.Which job needs a soil moisture sensor? (a) measure classroom noise (b) close a window in rain (c) make a parking alarm (d) water a dry plant
36. 36.🔍 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)?
37. 37.True or false: to switch on lamps at dusk, use a soil moisture sensor. (a) False (b) True
38. 38.🔍 A distance sensor sends a sound pulse and hears the echo 13 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
39. 39.True or false: to start a fan when hot, use a temperature sensor. (a) True (b) False
40. 40.True or false: to close a window in rain, use a soil moisture sensor. (a) False (b) True

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