Electronics Worksheet: Sensors and Actuators

Electronics lesson 26: Sensors and actuators · Set 178 · 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 switch on lamps at dusk, use a motion sensor. (a) False (b) True
2. 2.True or false: to measure classroom noise, use a sound sensor. (a) False (b) True
3. 3.🔍 Which sensor would you use to make a parking alarm? (a) a sound sensor (b) a distance sensor (c) a gas sensor (d) a light sensor
4. 4.Which job needs a light sensor? (a) spot someone walking in (b) keep an incubator warm (c) stop a robot near walls (d) switch on lamps at dusk
5. 5.⚙️ Which actuator would you use to spin a robot’s wheels? (a) a servo motor (b) a motor (c) an LED (d) a buzzer
6. 6.🔍 Which sensor would you use to open blinds at sunrise? (a) a light sensor (b) a soil moisture sensor (c) a gas sensor (d) a distance sensor
7. 7.⚙️ What is an actuator? (a) a program (b) a battery (c) an output that acts (d) a sensor
8. 8.Which job needs a pump? (a) show the temperature (b) move water to plants (c) turn to an exact angle (d) show a status light
9. 9.🔍 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)?
10. 10.🔍 For a microcontroller, is a sensor an input or an output? (a) a power source (b) an input (c) a fuse (d) an output
11. 11.🔍 Which sensor would you use to keep an incubator warm? (a) a rain sensor (b) a gas sensor (c) a light sensor (d) a temperature sensor
12. 12.🔍 Which sensor would you use to stop a robot near walls? (a) a distance sensor (b) a light sensor (c) a motion sensor (d) a rain sensor
13. 13.🔍 Which sensor would you use to water a dry plant? (a) a motion sensor (b) a gas sensor (c) a soil moisture sensor (d) a temperature sensor
14. 14.True or false: to spot someone walking in, use a rain sensor. (a) True (b) False
15. 15.True or false: to make a parking alarm, use a distance sensor. (a) False (b) True
16. 16.🔍 A distance sensor sends a sound pulse and hears the echo 2 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
17. 17.True or false: to measure classroom noise, use a light sensor. (a) True (b) False
18. 18.🔍 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?
19. 19.🔍 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?
20. 20.🔍 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)?
21. 21.🔍 Which sensor would you use to spot someone walking in? (a) a temperature sensor (b) a distance sensor (c) a sound sensor (d) a motion sensor
22. 22.Which job needs a sound sensor? (a) water a dry plant (b) measure classroom noise (c) close a window in rain (d) start a fan when hot
23. 23.True or false: to switch on with a clap, use a temperature sensor. (a) False (b) True
24. 24.Which job needs a motor? (a) turn to an exact angle (b) show the temperature (c) open a gate to 90° (d) spin a robot’s wheels
25. 25.⚙️ Which actuator would you use to move water to plants? (a) a pump (b) an LED (c) a display (d) a motor
26. 26.🔍 Which sensor would you use to warn of a gas leak? (a) a motion sensor (b) a temperature sensor (c) a gas sensor (d) a soil moisture sensor
27. 27.True or false: to start a fan when hot, use a temperature sensor. (a) True (b) False
28. 28.🔍 A distance sensor sends a sound pulse and hears the echo 19 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
29. 29.🔍 Which sensor would you use to switch on lamps at dusk? (a) a soil moisture sensor (b) a sound sensor (c) a temperature sensor (d) a light sensor
30. 30.🔍 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?
31. 31.🔍 Which sensor would you use to measure classroom noise? (a) a sound sensor (b) a motion sensor (c) a rain sensor (d) a gas sensor
32. 32.Which job needs a motion sensor? (a) spot someone walking in (b) warn of a gas leak (c) open blinds at sunrise (d) switch on lamps at dusk
33. 33.Which job needs a rain sensor? (a) switch on with a clap (b) close a window in rain (c) switch on lamps at dusk (d) spot someone walking in
34. 34.True or false: to start a fan when hot, use a distance sensor. (a) True (b) False
35. 35.🔍 Which sensor would you use to close a window in rain? (a) a soil moisture sensor (b) a sound sensor (c) a rain sensor (d) a light sensor
36. 36.🔍 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?
37. 37.True or false: to water a dry plant, use a soil moisture sensor. (a) True (b) False
38. 38.⚙️ Which actuator would you use to beep an alarm? (a) a pump (b) a buzzer (c) a display (d) an LED
39. 39.🔍 Which sensor would you use to start a fan when hot? (a) a sound sensor (b) a gas sensor (c) a temperature sensor (d) a distance sensor
40. 40.True or false: to switch on with a clap, use a sound sensor. (a) True (b) False

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