Electronics Worksheet: Sensors and Actuators

Electronics lesson 26: Sensors and actuators · Set 161 · 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 actuator would you use to open a gate to 90°? (a) a display (b) a motor (c) a buzzer (d) a servo motor
2. 2.⚙️ What is an actuator? (a) a sensor (b) a battery (c) a program (d) an output that acts
3. 3.Which job needs a pump? (a) beep an alarm (b) move water to plants (c) turn to an exact angle (d) show a status light
4. 4.True or false: to switch on lamps at dusk, use a light sensor. (a) True (b) False
5. 5.Which job needs an LED? (a) show the temperature (b) spin a robot’s wheels (c) turn to an exact angle (d) show a status light
6. 6.🔍 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)?
7. 7.True or false: to measure classroom noise, use a gas sensor. (a) False (b) True
8. 8.🔍 Which sensor would you use to measure classroom noise? (a) a distance sensor (b) a gas sensor (c) a light sensor (d) a sound sensor
9. 9.Which job needs a motor? (a) turn to an exact angle (b) show the temperature (c) spin a robot’s wheels (d) open a gate to 90°
10. 10.🔍 An object is 102 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
11. 11.Which job needs a display? (a) show the temperature (b) open a gate to 90° (c) move water to plants (d) show a status light
12. 12.🔍 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?
13. 13.🔍 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)?
14. 14.⚙️ Which actuator would you use to turn to an exact angle? (a) a pump (b) an LED (c) a display (d) a servo motor
15. 15.🔍 Which sensor would you use to open blinds at sunrise? (a) a light sensor (b) a rain sensor (c) a distance sensor (d) a motion sensor
16. 16.Which job needs a temperature sensor? (a) water a dry plant (b) start a fan when hot (c) switch on with a clap (d) warn of a gas leak
17. 17.🔍 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?
18. 18.Which job needs a soil moisture sensor? (a) stop a robot near walls (b) measure classroom noise (c) water a dry plant (d) spot someone walking in
19. 19.🔍 Which sensor would you use to start a fan when hot? (a) a motion sensor (b) a temperature sensor (c) a sound sensor (d) a gas sensor
20. 20.True or false: to close a window in rain, use a motion sensor. (a) False (b) True
21. 21.🔍 A distance sensor sends a sound pulse and hears the echo 20 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
22. 22.Which job needs a gas sensor? (a) stop a robot near walls (b) start a fan when hot (c) warn of a gas leak (d) make a parking alarm
23. 23.Which job needs a servo motor? (a) turn to an exact angle (b) move water to plants (c) show a status light (d) show the temperature
24. 24.True or false: to switch on lamps at dusk, use a distance sensor. (a) True (b) False
25. 25.Which job needs a rain sensor? (a) make a parking alarm (b) water a dry plant (c) spot someone walking in (d) close a window in rain
26. 26.🔍 Which sensor would you use to close a window in rain? (a) a rain sensor (b) a distance sensor (c) a motion sensor (d) a temperature sensor
27. 27.🔍 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?
28. 28.🔍 For a microcontroller, is a sensor an input or an output? (a) a power source (b) a fuse (c) an output (d) an input
29. 29.Which job needs a sound sensor? (a) keep an incubator warm (b) spot someone walking in (c) measure classroom noise (d) close a window in rain
30. 30.🔍 A distance sensor sends a sound pulse and hears the echo 17 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
31. 31.Which job needs a buzzer? (a) show a status light (b) beep an alarm (c) open a gate to 90° (d) turn to an exact angle
32. 32.🔍 Which sensor would you use to switch on with a clap? (a) a rain sensor (b) a soil moisture sensor (c) a gas sensor (d) a sound sensor
33. 33.⚙️ Which actuator would you use to show a status light? (a) a motor (b) a buzzer (c) an LED (d) a display
34. 34.True or false: to switch on lamps at dusk, use a gas sensor. (a) True (b) False
35. 35.Which job needs a distance sensor? (a) start a fan when hot (b) make a parking alarm (c) keep an incubator warm (d) measure classroom noise
36. 36.🔍 Which sensor would you use to warn of a gas leak? (a) a temperature sensor (b) a distance sensor (c) a motion sensor (d) a gas sensor
37. 37.True or false: to keep an incubator warm, use a soil moisture sensor. (a) False (b) True
38. 38.True or false: to stop a robot near walls, use a rain sensor. (a) True (b) False
39. 39.⚙️ Which actuator would you use to move water to plants? (a) a display (b) a pump (c) a servo motor (d) a buzzer
40. 40.⚙️ Which actuator would you use to beep an alarm? (a) a display (b) a servo motor (c) a buzzer (d) a pump

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