Electronics Worksheet: Sensors and Actuators

Electronics lesson 26: Sensors and actuators · Set 116 · 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 rain sensor? (a) warn of a gas leak (b) switch on lamps at dusk (c) close a window in rain (d) water a dry plant
2. 2.Which job needs a servo motor? (a) beep an alarm (b) move water to plants (c) show the temperature (d) open a gate to 90°
3. 3.🔍 Which sensor would you use to start a fan when hot? (a) a temperature sensor (b) a rain sensor (c) a light sensor (d) a sound sensor
4. 4.🔍 Which sensor would you use to open blinds at sunrise? (a) a motion sensor (b) a temperature sensor (c) a light sensor (d) a soil moisture sensor
5. 5.Which job needs a gas sensor? (a) switch on with a clap (b) open blinds at sunrise (c) close a window in rain (d) warn of a gas leak
6. 6.Which job needs an LED? (a) move water to plants (b) turn to an exact angle (c) beep an alarm (d) show a status light
7. 7.🔍 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?
8. 8.True or false: to make a parking alarm, use a distance sensor. (a) False (b) True
9. 9.⚙️ Which actuator would you use to open a gate to 90°? (a) a servo motor (b) an LED (c) a pump (d) a buzzer
10. 10.⚙️ Which actuator would you use to turn to an exact angle? (a) a pump (b) a servo motor (c) a motor (d) a display
11. 11.Which job needs a light sensor? (a) open blinds at sunrise (b) keep an incubator warm (c) warn of a gas leak (d) measure classroom noise
12. 12.🔍 A distance sensor sends a sound pulse and hears the echo 8 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
13. 13.True or false: to switch on lamps at dusk, use a gas sensor. (a) True (b) False
14. 14.Which job needs a soil moisture sensor? (a) warn of a gas leak (b) switch on with a clap (c) water a dry plant (d) close a window in rain
15. 15.Which job needs a distance sensor? (a) measure classroom noise (b) close a window in rain (c) stop a robot near walls (d) keep an incubator warm
16. 16.🔍 For a microcontroller, is a sensor an input or an output? (a) a fuse (b) an input (c) an output (d) a power source
17. 17.⚙️ Which actuator would you use to spin a robot’s wheels? (a) a motor (b) an LED (c) a servo motor (d) a pump
18. 18.⚙️ What is an actuator? (a) a sensor (b) a battery (c) a program (d) an output that acts
19. 19.🔍 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)?
20. 20.Which job needs a servo motor? (a) turn to an exact angle (b) move water to plants (c) show a status light (d) show the temperature
21. 21.🔍 Which sensor would you use to warn of a gas leak? (a) a sound sensor (b) a gas sensor (c) a soil moisture sensor (d) a rain sensor
22. 22.Which job needs a buzzer? (a) turn to an exact angle (b) show a status light (c) show the temperature (d) beep an alarm
23. 23.True or false: to stop a robot near walls, use a light sensor. (a) False (b) True
24. 24.True or false: to open blinds at sunrise, use a light sensor. (a) True (b) False
25. 25.⚙️ Which actuator would you use to move water to plants? (a) an LED (b) a display (c) a pump (d) a buzzer
26. 26.True or false: to close a window in rain, use a rain sensor. (a) True (b) False
27. 27.🔍 Which sensor would you use to water a dry plant? (a) a soil moisture sensor (b) a distance sensor (c) a motion sensor (d) a sound sensor
28. 28.True or false: to water a dry plant, use a soil moisture sensor. (a) True (b) False
29. 29.🔍 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?
30. 30.Which job needs a motor? (a) show the temperature (b) spin a robot’s wheels (c) move water to plants (d) open a gate to 90°
31. 31.Which job needs a pump? (a) move water to plants (b) show a status light (c) beep an alarm (d) spin a robot’s wheels
32. 32.True or false: to switch on with a clap, use a gas sensor. (a) False (b) True
33. 33.🔍 Which sensor would you use to spot someone walking in? (a) a gas sensor (b) a light sensor (c) a motion sensor (d) a temperature sensor
34. 34.🔍 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)?
35. 35.True or false: to water a dry plant, use a temperature sensor. (a) False (b) True
36. 36.🔍 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)?
37. 37.Which job needs a temperature sensor? (a) make a parking alarm (b) stop a robot near walls (c) switch on lamps at dusk (d) start a fan when hot
38. 38.Which job needs a distance sensor? (a) spot someone walking in (b) switch on lamps at dusk (c) keep an incubator warm (d) make a parking alarm
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.⚙️ Which actuator would you use to beep an alarm? (a) a pump (b) an LED (c) a buzzer (d) a motor

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