Electronics Worksheet: Sensors and Actuators

Electronics lesson 26: Sensors and actuators · Set 126 · 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 make a parking alarm, use a distance sensor. (a) True (b) False
2. 2.Which job needs a distance sensor? (a) switch on with a clap (b) measure classroom noise (c) warn of a gas leak (d) stop a robot near walls
3. 3.🔍 For a microcontroller, is a sensor an input or an output? (a) a power source (b) an output (c) an input (d) a fuse
4. 4.⚙️ Which actuator would you use to beep an alarm? (a) a motor (b) a display (c) a servo motor (d) a buzzer
5. 5.Which job needs a soil moisture sensor? (a) switch on with a clap (b) water a dry plant (c) measure classroom noise (d) open blinds at sunrise
6. 6.⚙️ Which actuator would you use to turn to an exact angle? (a) an LED (b) a servo motor (c) a display (d) a motor
7. 7.⚙️ What is an actuator? (a) a battery (b) a sensor (c) an output that acts (d) a program
8. 8.Which job needs a motor? (a) move water to plants (b) turn to an exact angle (c) spin a robot’s wheels (d) show a status light
9. 9.Which job needs a pump? (a) move water to plants (b) turn to an exact angle (c) show the temperature (d) beep an alarm
10. 10.True or false: to switch on with a clap, use a gas sensor. (a) False (b) True
11. 11.True or false: to close a window in rain, use a rain sensor. (a) True (b) False
12. 12.🔍 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)?
13. 13.True or false: to start a fan when hot, use a light sensor. (a) False (b) True
14. 14.🔍 Which sensor would you use to start a fan when hot? (a) a gas sensor (b) a sound sensor (c) a light sensor (d) a temperature sensor
15. 15.🔍 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)?
16. 16.Which job needs a gas sensor? (a) warn of a gas leak (b) open blinds at sunrise (c) start a fan when hot (d) measure classroom noise
17. 17.🔍 An object is 306 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
18. 18.True or false: to open blinds at sunrise, use a light sensor. (a) False (b) True
19. 19.Which job needs a temperature sensor? (a) switch on lamps at dusk (b) keep an incubator warm (c) water a dry plant (d) open blinds at sunrise
20. 20.🔍 An object is 204 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
21. 21.⚙️ Which actuator would you use to show the temperature? (a) a buzzer (b) a display (c) an LED (d) a motor
22. 22.True or false: to switch on lamps at dusk, use a light sensor. (a) True (b) False
23. 23.⚙️ Which actuator would you use to move water to plants? (a) a pump (b) an LED (c) a buzzer (d) a display
24. 24.⚙️ Which actuator would you use to spin a robot’s wheels? (a) a buzzer (b) a motor (c) a display (d) a servo motor
25. 25.Which job needs an LED? (a) show a status light (b) move water to plants (c) turn to an exact angle (d) open a gate to 90°
26. 26.True or false: to switch on with a clap, use a sound sensor. (a) False (b) True
27. 27.⚙️ Which actuator would you use to open a gate to 90°? (a) an LED (b) a display (c) a buzzer (d) a servo motor
28. 28.🔍 Which sensor would you use to stop a robot near walls? (a) a soil moisture sensor (b) a rain sensor (c) a distance sensor (d) a temperature sensor
29. 29.Which job needs a display? (a) open a gate to 90° (b) show the temperature (c) show a status light (d) beep an alarm
30. 30.🔍 Which sensor would you use to water a dry plant? (a) a sound sensor (b) a gas sensor (c) a soil moisture sensor (d) a rain sensor
31. 31.True or false: to switch on lamps at dusk, use a distance sensor. (a) True (b) False
32. 32.🔍 Which sensor would you use to measure classroom noise? (a) a gas sensor (b) a light sensor (c) a motion sensor (d) a sound sensor
33. 33.🔍 A distance sensor sends a sound pulse and hears the echo 16 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
34. 34.🔍 An object is 153 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
35. 35.🔍 Which sensor would you use to close a window in rain? (a) a rain sensor (b) a distance sensor (c) a gas sensor (d) a sound sensor
36. 36.🔍 Which sensor would you use to keep an incubator warm? (a) a temperature sensor (b) a gas sensor (c) a soil moisture sensor (d) a sound sensor
37. 37.True or false: to start a fan when hot, use a temperature sensor. (a) True (b) False
38. 38.Which job needs a motion sensor? (a) switch on lamps at dusk (b) open blinds at sunrise (c) keep an incubator warm (d) spot someone walking in
39. 39.🔍 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?
40. 40.🔍 Which sensor would you use to open blinds at sunrise? (a) a temperature sensor (b) a sound sensor (c) a light sensor (d) a soil moisture sensor

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