Electronics Worksheet: Sensors and Actuators

Electronics lesson 26: Sensors and actuators · Set 200 · 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.⚙️ What is an actuator? (a) a program (b) an output that acts (c) a battery (d) a sensor
2. 2.Which job needs a soil moisture sensor? (a) stop a robot near walls (b) switch on lamps at dusk (c) switch on with a clap (d) water a dry plant
3. 3.🔍 A distance sensor sends a sound pulse and hears the echo 3 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
4. 4.⚙️ Which actuator would you use to spin a robot’s wheels? (a) a buzzer (b) an LED (c) a display (d) a motor
5. 5.🔍 For a microcontroller, is a sensor an input or an output? (a) an output (b) a fuse (c) an input (d) a power source
6. 6.Which job needs a distance sensor? (a) start a fan when hot (b) switch on lamps at dusk (c) stop a robot near walls (d) spot someone walking in
7. 7.⚙️ Which actuator would you use to show the temperature? (a) a motor (b) a display (c) a servo motor (d) a pump
8. 8.⚙️ Which actuator would you use to turn to an exact angle? (a) a buzzer (b) a pump (c) a motor (d) a servo motor
9. 9.True or false: to warn of a gas leak, use a temperature sensor. (a) True (b) False
10. 10.True or false: to water a dry plant, use a soil moisture sensor. (a) True (b) False
11. 11.Which job needs a light sensor? (a) start a fan when hot (b) make a parking alarm (c) switch on lamps at dusk (d) stop a robot near walls
12. 12.🔍 A distance sensor sends a sound pulse and hears the echo 10 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
13. 13.🔍 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?
14. 14.Which job needs a pump? (a) move water to plants (b) show the temperature (c) spin a robot’s wheels (d) open a gate to 90°
15. 15.Which job needs a gas sensor? (a) start a fan when hot (b) keep an incubator warm (c) close a window in rain (d) warn of a gas leak
16. 16.Which job needs a rain sensor? (a) measure classroom noise (b) start a fan when hot (c) close a window in rain (d) spot someone walking in
17. 17.🔍 Which sensor would you use to open blinds at sunrise? (a) a light sensor (b) a rain sensor (c) a motion sensor (d) a soil moisture sensor
18. 18.⚙️ Which actuator would you use to beep an alarm? (a) a buzzer (b) an LED (c) a display (d) a motor
19. 19.🔍 An object is 255 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
20. 20.Which job needs a servo motor? (a) beep an alarm (b) show the temperature (c) turn to an exact angle (d) spin a robot’s wheels
21. 21.🔍 Which sensor would you use to switch on with a clap? (a) a soil moisture sensor (b) a motion sensor (c) a sound sensor (d) a gas sensor
22. 22.Which job needs a buzzer? (a) spin a robot’s wheels (b) turn to an exact angle (c) move water to plants (d) beep an alarm
23. 23.Which job needs a light sensor? (a) measure classroom noise (b) open blinds at sunrise (c) keep an incubator warm (d) spot someone walking in
24. 24.Which job needs a distance sensor? (a) switch on with a clap (b) measure classroom noise (c) close a window in rain (d) make a parking alarm
25. 25.🔍 A distance sensor sends a sound pulse and hears the echo 6 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
26. 26.🔍 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)?
27. 27.Which job needs a temperature sensor? (a) switch on with a clap (b) start a fan when hot (c) open blinds at sunrise (d) stop a robot near walls
28. 28.🔍 Which sensor would you use to water a dry plant? (a) a soil moisture sensor (b) a distance sensor (c) a gas sensor (d) a temperature sensor
29. 29.🔍 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?
30. 30.True or false: to switch on with a clap, use a sound sensor. (a) True (b) False
31. 31.🔍 An object is 51 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
32. 32.Which job needs a sound sensor? (a) switch on with a clap (b) switch on lamps at dusk (c) open blinds at sunrise (d) warn of a gas leak
33. 33.Which job needs an LED? (a) show a status light (b) beep an alarm (c) move water to plants (d) turn to an exact angle
34. 34.Which job needs a motor? (a) spin a robot’s wheels (b) beep an alarm (c) show the temperature (d) open a gate to 90°
35. 35.True or false: to start a fan when hot, use a rain sensor. (a) True (b) False
36. 36.🔍 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)?
37. 37.Which job needs a motion sensor? (a) spot someone walking in (b) open blinds at sunrise (c) water a dry plant (d) measure classroom noise
38. 38.🔍 Which sensor would you use to make a parking alarm? (a) a sound sensor (b) a motion sensor (c) a light sensor (d) a distance sensor
39. 39.True or false: to spot someone walking in, use a gas sensor. (a) True (b) False
40. 40.🔍 Which sensor would you use to measure classroom noise? (a) a gas sensor (b) a sound sensor (c) a light sensor (d) a temperature sensor

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