Electronics Worksheet: Sensors and Actuators

Electronics lesson 26: Sensors and actuators · Set 18 · 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 battery (b) a program (c) a sensor (d) an output that acts
2. 2.🔍 For a microcontroller, is a sensor an input or an output? (a) a power source (b) an output (c) an input (d) a fuse
3. 3.True or false: to keep an incubator warm, use a temperature sensor. (a) True (b) False
4. 4.Which job needs a buzzer? (a) show a status light (b) beep an alarm (c) spin a robot’s wheels (d) turn to an exact angle
5. 5.Which job needs a light sensor? (a) measure classroom noise (b) switch on lamps at dusk (c) start a fan when hot (d) close a window in rain
6. 6.🔍 An object is 221 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
7. 7.True or false: to measure classroom noise, use a sound sensor. (a) False (b) True
8. 8.Which job needs a servo motor? (a) show a status light (b) show the temperature (c) move water to plants (d) open a gate to 90°
9. 9.Which job needs a temperature sensor? (a) make a parking alarm (b) switch on lamps at dusk (c) keep an incubator warm (d) measure classroom noise
10. 10.🔍 An object is 85 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
11. 11.🔍 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)?
12. 12.🔍 Which sensor would you use to measure classroom noise? (a) a soil moisture sensor (b) a sound sensor (c) a distance sensor (d) a light sensor
13. 13.Which job needs a gas sensor? (a) open blinds at sunrise (b) make a parking alarm (c) warn of a gas leak (d) close a window in rain
14. 14.🔍 Which sensor would you use to keep an incubator warm? (a) a temperature sensor (b) a light sensor (c) a motion sensor (d) a soil moisture sensor
15. 15.🔍 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)?
16. 16.🔍 Which sensor would you use to make a parking alarm? (a) a distance sensor (b) a temperature sensor (c) a light sensor (d) a rain sensor
17. 17.🔍 Which sensor would you use to switch on lamps at dusk? (a) a sound sensor (b) a gas sensor (c) a soil moisture sensor (d) a light sensor
18. 18.Which job needs a light sensor? (a) open blinds at sunrise (b) warn of a gas leak (c) switch on with a clap (d) keep an incubator warm
19. 19.🔍 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?
20. 20.Which job needs a distance sensor? (a) spot someone walking in (b) stop a robot near walls (c) measure classroom noise (d) start a fan when hot
21. 21.Which job needs a rain sensor? (a) keep an incubator warm (b) switch on with a clap (c) stop a robot near walls (d) close a window in rain
22. 22.🔍 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)?
23. 23.🔍 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?
24. 24.⚙️ Which actuator would you use to move water to plants? (a) a servo motor (b) a pump (c) a display (d) a buzzer
25. 25.Which job needs a motor? (a) beep an alarm (b) turn to an exact angle (c) open a gate to 90° (d) spin a robot’s wheels
26. 26.True or false: to water a dry plant, use a soil moisture sensor. (a) True (b) False
27. 27.🔍 Which sensor would you use to open blinds at sunrise? (a) a light sensor (b) a sound sensor (c) a temperature sensor (d) a motion sensor
28. 28.⚙️ Which actuator would you use to show the temperature? (a) a pump (b) a display (c) an LED (d) a servo motor
29. 29.🔍 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)?
30. 30.⚙️ Which actuator would you use to show a status light? (a) a buzzer (b) a pump (c) a servo motor (d) an LED
31. 31.🔍 Which sensor would you use to water a dry plant? (a) a motion sensor (b) a soil moisture sensor (c) a rain sensor (d) a temperature sensor
32. 32.🔍 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?
33. 33.🔍 Which sensor would you use to start a fan when hot? (a) a light sensor (b) a temperature sensor (c) a motion sensor (d) a gas sensor
34. 34.True or false: to spot someone walking in, use a motion sensor. (a) True (b) False
35. 35.Which job needs a temperature sensor? (a) start a fan when hot (b) stop a robot near walls (c) measure classroom noise (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.🔍 Which sensor would you use to warn of a gas leak? (a) a gas sensor (b) a distance sensor (c) a motion sensor (d) a light sensor
38. 38.True or false: to keep an incubator warm, use a rain sensor. (a) True (b) False
39. 39.🔍 A distance sensor sends a sound pulse and hears the echo 4 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
40. 40.Which job needs a distance sensor? (a) make a parking alarm (b) water a dry plant (c) warn of a gas leak (d) start a fan when hot

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