Electronics Worksheet: Sensors and Actuators

Electronics lesson 26: Sensors and actuators · Set 236 · 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 sensor would you use to start a fan when hot? (a) a light sensor (b) a sound sensor (c) a soil moisture sensor (d) a temperature sensor
2. 2.🔍 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)?
3. 3.True or false: to measure classroom noise, use a soil moisture sensor. (a) False (b) True
4. 4.Which job needs a gas sensor? (a) close a window in rain (b) open blinds at sunrise (c) warn of a gas leak (d) stop a robot near walls
5. 5.Which job needs a motor? (a) beep an alarm (b) show the temperature (c) spin a robot’s wheels (d) turn to an exact angle
6. 6.🔍 Which sensor would you use to water a dry plant? (a) a gas sensor (b) a soil moisture sensor (c) a motion sensor (d) a distance sensor
7. 7.🔍 Which sensor would you use to stop a robot near walls? (a) a temperature sensor (b) a soil moisture sensor (c) a distance sensor (d) a light sensor
8. 8.🔍 For a microcontroller, is a sensor an input or an output? (a) an input (b) a fuse (c) an output (d) a power source
9. 9.Which job needs a servo motor? (a) beep an alarm (b) spin a robot’s wheels (c) show the temperature (d) open a gate to 90°
10. 10.True or false: to start a fan when hot, use a motion sensor. (a) False (b) True
11. 11.⚙️ Which actuator would you use to spin a robot’s wheels? (a) a motor (b) a display (c) a servo motor (d) an LED
12. 12.True or false: to start a fan when hot, use a temperature sensor. (a) False (b) True
13. 13.🔍 A distance sensor sends a sound pulse and hears the echo 18 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
14. 14.Which job needs a soil moisture sensor? (a) keep an incubator warm (b) spot someone walking in (c) water a dry plant (d) switch on lamps at dusk
15. 15.Which job needs a motion sensor? (a) spot someone walking in (b) start a fan when hot (c) switch on with a clap (d) switch on lamps at dusk
16. 16.🔍 Which sensor would you use to make a parking alarm? (a) a distance sensor (b) a soil moisture sensor (c) a sound sensor (d) a light sensor
17. 17.Which job needs a temperature sensor? (a) close a window in rain (b) keep an incubator warm (c) warn of a gas leak (d) switch on with a clap
18. 18.🔍 An object is 170 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
19. 19.🔍 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)?
20. 20.True or false: to water a dry plant, use a rain sensor. (a) False (b) True
21. 21.Which job needs a rain sensor? (a) close a window in rain (b) switch on with a clap (c) water a dry plant (d) open blinds at sunrise
22. 22.🔍 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?
23. 23.⚙️ What is an actuator? (a) a battery (b) a program (c) a sensor (d) an output that acts
24. 24.Which job needs a temperature sensor? (a) warn of a gas leak (b) start a fan when hot (c) open blinds at sunrise (d) water a dry plant
25. 25.🔍 Which sensor would you use to switch on with a clap? (a) a temperature sensor (b) a gas sensor (c) a soil moisture sensor (d) a sound sensor
26. 26.⚙️ Which actuator would you use to beep an alarm? (a) an LED (b) a buzzer (c) a pump (d) a display
27. 27.🔍 Which sensor would you use to close a window in rain? (a) a soil moisture sensor (b) a temperature sensor (c) a motion sensor (d) a rain sensor
28. 28.⚙️ Which actuator would you use to show a status light? (a) a buzzer (b) a servo motor (c) a motor (d) an LED
29. 29.🔍 Which sensor would you use to measure classroom noise? (a) a motion sensor (b) a soil moisture sensor (c) a sound sensor (d) a light sensor
30. 30.Which job needs a light sensor? (a) switch on with a clap (b) stop a robot near walls (c) keep an incubator warm (d) open blinds at sunrise
31. 31.🔍 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?
32. 32.🔍 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?
33. 33.True or false: to switch on with a clap, use a soil moisture sensor. (a) False (b) True
34. 34.True or false: to spot someone walking in, use a light sensor. (a) False (b) True
35. 35.Which job needs a distance sensor? (a) make a parking alarm (b) close a window in rain (c) measure classroom noise (d) water a dry plant
36. 36.Which job needs a sound sensor? (a) start a fan when hot (b) open blinds at sunrise (c) warn of a gas leak (d) switch on with a clap
37. 37.🔍 Which sensor would you use to switch on lamps at dusk? (a) a gas sensor (b) a soil moisture sensor (c) a light sensor (d) a temperature sensor
38. 38.🔍 Which sensor would you use to spot someone walking in? (a) a distance sensor (b) a motion sensor (c) a gas sensor (d) a soil moisture sensor
39. 39.🔍 An object is 136 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
40. 40.🔍 An object is 17 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?

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