Electronics Worksheet: Sensors and Actuators

Electronics lesson 26: Sensors and actuators · Set 216 · 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 job needs a motion sensor? (a) spot someone walking in (b) switch on with a clap (c) stop a robot near walls (d) close a window in rain
2. 2.⚙️ Which actuator would you use to open a gate to 90°? (a) a servo motor (b) an LED (c) a pump (d) a buzzer
3. 3.Which job needs a light sensor? (a) keep an incubator warm (b) start a fan when hot (c) close a window in rain (d) switch on lamps at dusk
4. 4.Which job needs a distance sensor? (a) switch on lamps at dusk (b) spot someone walking in (c) open blinds at sunrise (d) make a parking alarm
5. 5.Which job needs a display? (a) spin a robot’s wheels (b) show the temperature (c) open a gate to 90° (d) turn to an exact angle
6. 6.⚙️ Which actuator would you use to spin a robot’s wheels? (a) a display (b) an LED (c) a motor (d) a servo motor
7. 7.Which job needs a soil moisture sensor? (a) spot someone walking in (b) measure classroom noise (c) open blinds at sunrise (d) water a dry plant
8. 8.⚙️ Which actuator would you use to turn to an exact angle? (a) an LED (b) a display (c) a servo motor (d) a motor
9. 9.🔍 Which sensor would you use to measure classroom noise? (a) a temperature sensor (b) a sound sensor (c) a soil moisture sensor (d) a light sensor
10. 10.Which job needs a gas sensor? (a) make a parking alarm (b) warn of a gas leak (c) measure classroom noise (d) keep an incubator warm
11. 11.Which job needs a buzzer? (a) turn to an exact angle (b) show a status light (c) beep an alarm (d) move water to plants
12. 12.True or false: to spot someone walking in, use a motion sensor. (a) True (b) False
13. 13.🔍 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?
14. 14.Which job needs a distance sensor? (a) water a dry plant (b) stop a robot near walls (c) close a window in rain (d) start a fan when hot
15. 15.Which job needs a servo motor? (a) spin a robot’s wheels (b) move water to plants (c) show a status light (d) turn to an exact angle
16. 16.⚙️ Which actuator would you use to beep an alarm? (a) an LED (b) a display (c) a servo motor (d) a buzzer
17. 17.🔍 For a microcontroller, is a sensor an input or an output? (a) a fuse (b) an input (c) a power source (d) an output
18. 18.True or false: to spot someone walking in, use a temperature sensor. (a) False (b) True
19. 19.Which job needs an LED? (a) show a status light (b) beep an alarm (c) spin a robot’s wheels (d) show the temperature
20. 20.🔍 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?
21. 21.🔍 Which sensor would you use to water a dry plant? (a) a soil moisture sensor (b) a light sensor (c) a sound sensor (d) a motion sensor
22. 22.Which job needs a servo motor? (a) show a status light (b) beep an alarm (c) open a gate to 90° (d) spin a robot’s wheels
23. 23.🔍 An object is 340 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
24. 24.True or false: to spot someone walking in, use a soil moisture sensor. (a) False (b) True
25. 25.Which job needs a motor? (a) beep an alarm (b) open a gate to 90° (c) show a status light (d) spin a robot’s wheels
26. 26.🔍 Which sensor would you use to close a window in rain? (a) a temperature sensor (b) a gas sensor (c) a rain sensor (d) a motion sensor
27. 27.Which job needs a light sensor? (a) water a dry plant (b) open blinds at sunrise (c) make a parking alarm (d) spot someone walking in
28. 28.⚙️ Which actuator would you use to move water to plants? (a) a pump (b) a servo motor (c) a buzzer (d) an LED
29. 29.⚙️ What is an actuator? (a) an output that acts (b) a battery (c) a program (d) a sensor
30. 30.🔍 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)?
31. 31.🔍 Which sensor would you use to warn of a gas leak? (a) a sound sensor (b) a motion sensor (c) a gas sensor (d) a rain sensor
32. 32.🔍 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?
33. 33.True or false: to close a window in rain, use a temperature sensor. (a) False (b) True
34. 34.True or false: to open blinds at sunrise, use a light sensor. (a) True (b) False
35. 35.⚙️ Which actuator would you use to show a status light? (a) an LED (b) a servo motor (c) a motor (d) a pump
36. 36.🔍 Which sensor would you use to make a parking alarm? (a) a motion sensor (b) a soil moisture sensor (c) a rain sensor (d) a distance sensor
37. 37.True or false: to close a window in rain, use a rain sensor. (a) False (b) True
38. 38.🔍 A distance sensor sends a sound pulse and hears the echo 11 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
39. 39.Which job needs a pump? (a) spin a robot’s wheels (b) move water to plants (c) open a gate to 90° (d) turn to an exact angle
40. 40.True or false: to start a fan when hot, use a sound sensor. (a) True (b) False

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