Electronics Worksheet: Sensors and Actuators

Electronics lesson 26: Sensors and actuators · Set 219 · 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 distance sensor? (a) keep an incubator warm (b) measure classroom noise (c) spot someone walking in (d) stop a robot near walls
2. 2.⚙️ Which actuator would you use to show the temperature? (a) a pump (b) an LED (c) a motor (d) a display
3. 3.🔍 An object is 34 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
4. 4.🔍 Which sensor would you use to water a dry plant? (a) a light sensor (b) a temperature sensor (c) a sound sensor (d) a soil moisture sensor
5. 5.🔍 Which sensor would you use to measure classroom noise? (a) a sound sensor (b) a motion sensor (c) a temperature sensor (d) a light sensor
6. 6.🔍 Which sensor would you use to open blinds at sunrise? (a) a temperature sensor (b) a gas sensor (c) a motion sensor (d) a light sensor
7. 7.🔍 For a microcontroller, is a sensor an input or an output? (a) a power source (b) an input (c) a fuse (d) an output
8. 8.🔍 An object is 68 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
9. 9.⚙️ What is an actuator? (a) an output that acts (b) a program (c) a battery (d) a sensor
10. 10.True or false: to keep an incubator warm, use a distance sensor. (a) True (b) False
11. 11.🔍 Which sensor would you use to stop a robot near walls? (a) a soil moisture sensor (b) a distance sensor (c) a rain sensor (d) a sound sensor
12. 12.Which job needs a display? (a) move water to plants (b) turn to an exact angle (c) show the temperature (d) spin a robot’s wheels
13. 13.🔍 Which sensor would you use to keep an incubator warm? (a) a rain sensor (b) a motion sensor (c) a soil moisture sensor (d) a temperature sensor
14. 14.🔍 A distance sensor sends a sound pulse and hears the echo 12 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
15. 15.Which job needs a temperature sensor? (a) start a fan when hot (b) spot someone walking in (c) warn of a gas leak (d) switch on lamps at dusk
16. 16.🔍 A distance sensor sends a sound pulse and hears the echo 7 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
17. 17.Which job needs a servo motor? (a) move water to plants (b) beep an alarm (c) open a gate to 90° (d) spin a robot’s wheels
18. 18.True or false: to switch on with a clap, use a rain sensor. (a) True (b) False
19. 19.Which job needs a light sensor? (a) switch on lamps at dusk (b) keep an incubator warm (c) switch on with a clap (d) close a window in rain
20. 20.True or false: to start a fan when hot, use a temperature sensor. (a) True (b) False
21. 21.Which job needs a rain sensor? (a) stop a robot near walls (b) keep an incubator warm (c) close a window in rain (d) switch on with a clap
22. 22.🔍 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
23. 23.🔍 Which sensor would you use to close a window in rain? (a) a temperature sensor (b) a soil moisture sensor (c) a gas sensor (d) a rain sensor
24. 24.Which job needs a gas sensor? (a) keep an incubator warm (b) make a parking alarm (c) spot someone walking in (d) warn of a gas leak
25. 25.⚙️ Which actuator would you use to turn to an exact angle? (a) a pump (b) an LED (c) a buzzer (d) a servo motor
26. 26.Which job needs a servo motor? (a) move water to plants (b) spin a robot’s wheels (c) turn to an exact angle (d) show the temperature
27. 27.🔍 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)?
28. 28.⚙️ Which actuator would you use to spin a robot’s wheels? (a) a motor (b) an LED (c) a buzzer (d) a pump
29. 29.🔍 Which sensor would you use to start a fan when hot? (a) a temperature sensor (b) a light sensor (c) a sound sensor (d) a distance sensor
30. 30.Which job needs a temperature sensor? (a) switch on lamps at dusk (b) keep an incubator warm (c) warn of a gas leak (d) open blinds at sunrise
31. 31.🔍 Which sensor would you use to spot someone walking in? (a) a motion sensor (b) a rain sensor (c) a distance sensor (d) a temperature sensor
32. 32.True or false: to open blinds at sunrise, use a light sensor. (a) True (b) False
33. 33.True or false: to warn of a gas leak, use a distance sensor. (a) False (b) True
34. 34.Which job needs an LED? (a) turn to an exact angle (b) show a status light (c) spin a robot’s wheels (d) show the temperature
35. 35.🔍 A distance sensor sends a sound pulse and hears the echo 11 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
36. 36.True or false: to measure classroom noise, use a temperature sensor. (a) False (b) True
37. 37.Which job needs a pump? (a) open a gate to 90° (b) turn to an exact angle (c) show the temperature (d) move water to plants
38. 38.🔍 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?
39. 39.Which job needs a motor? (a) move water to plants (b) show a status light (c) spin a robot’s wheels (d) turn to an exact angle
40. 40.⚙️ Which actuator would you use to show a status light? (a) a pump (b) an LED (c) a servo motor (d) a buzzer

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