Electronics Worksheet: Sensors and Actuators

Electronics lesson 26: Sensors and actuators · Set 265 · 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 with a clap, use a rain sensor. (a) True (b) False
2. 2.⚙️ What is an actuator? (a) a sensor (b) a battery (c) an output that acts (d) a program
3. 3.Which job needs a light sensor? (a) make a parking alarm (b) open blinds at sunrise (c) stop a robot near walls (d) spot someone walking in
4. 4.Which job needs a buzzer? (a) show a status light (b) beep an alarm (c) spin a robot’s wheels (d) open a gate to 90°
5. 5.Which job needs a sound sensor? (a) spot someone walking in (b) start a fan when hot (c) measure classroom noise (d) make a parking alarm
6. 6.🔍 Which sensor would you use to close a window in rain? (a) a rain sensor (b) a soil moisture sensor (c) a light sensor (d) a distance sensor
7. 7.Which job needs a soil moisture sensor? (a) spot someone walking in (b) warn of a gas leak (c) keep an incubator warm (d) water a dry plant
8. 8.Which job needs a temperature sensor? (a) start a fan when hot (b) open blinds at sunrise (c) measure classroom noise (d) warn of a gas leak
9. 9.🔍 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?
10. 10.Which job needs a sound sensor? (a) switch on with a clap (b) open blinds at sunrise (c) stop a robot near walls (d) water a dry plant
11. 11.🔍 An object is 68 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
12. 12.Which job needs a servo motor? (a) beep an alarm (b) spin a robot’s wheels (c) turn to an exact angle (d) move water to plants
13. 13.True or false: to keep an incubator warm, use a temperature sensor. (a) True (b) False
14. 14.True or false: to keep an incubator warm, use a distance sensor. (a) True (b) False
15. 15.🔍 Which sensor would you use to spot someone walking in? (a) a soil moisture sensor (b) a distance sensor (c) a rain sensor (d) a motion sensor
16. 16.⚙️ Which actuator would you use to show a status light? (a) a buzzer (b) a servo motor (c) a motor (d) an LED
17. 17.Which job needs a pump? (a) turn to an exact angle (b) show the temperature (c) move water to plants (d) show a status light
18. 18.Which job needs a distance sensor? (a) start a fan when hot (b) measure classroom noise (c) spot someone walking in (d) stop a robot near walls
19. 19.🔍 For a microcontroller, is a sensor an input or an output? (a) a fuse (b) a power source (c) an output (d) an input
20. 20.🔍 Which sensor would you use to start a fan when hot? (a) a temperature sensor (b) a distance sensor (c) a soil moisture sensor (d) a sound sensor
21. 21.🔍 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)?
22. 22.Which job needs an LED? (a) beep an alarm (b) show a status light (c) move water to plants (d) open a gate to 90°
23. 23.Which job needs a motion sensor? (a) water a dry plant (b) open blinds at sunrise (c) spot someone walking in (d) keep an incubator warm
24. 24.🔍 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)?
25. 25.🔍 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?
26. 26.Which job needs a gas sensor? (a) close a window in rain (b) switch on lamps at dusk (c) warn of a gas leak (d) keep an incubator warm
27. 27.Which job needs a motor? (a) show the temperature (b) open a gate to 90° (c) spin a robot’s wheels (d) beep an alarm
28. 28.Which job needs a distance sensor? (a) open blinds at sunrise (b) make a parking alarm (c) spot someone walking in (d) warn of a gas leak
29. 29.🔍 Which sensor would you use to warn of a gas leak? (a) a motion sensor (b) a sound sensor (c) a light sensor (d) a gas sensor
30. 30.🔍 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)?
31. 31.⚙️ Which actuator would you use to show the temperature? (a) an LED (b) a motor (c) a buzzer (d) a display
32. 32.True or false: to switch on lamps at dusk, use a light sensor. (a) False (b) True
33. 33.🔍 An object is 187 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
34. 34.⚙️ Which actuator would you use to turn to an exact angle? (a) an LED (b) a display (c) a servo motor (d) a buzzer
35. 35.🔍 Which sensor would you use to switch on with a clap? (a) a motion sensor (b) a light sensor (c) a soil moisture sensor (d) a sound sensor
36. 36.🔍 Which sensor would you use to switch on lamps at dusk? (a) a sound sensor (b) a light sensor (c) a motion sensor (d) a soil moisture sensor
37. 37.True or false: to switch on lamps at dusk, use a motion sensor. (a) True (b) False
38. 38.True or false: to switch on lamps at dusk, use a distance sensor. (a) True (b) False
39. 39.True or false: to switch on with a clap, use a distance sensor. (a) True (b) False
40. 40.Which job needs a display? (a) open a gate to 90° (b) show the temperature (c) show a status light (d) beep an alarm

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