Electronics Worksheet: Sensors and Actuators

Electronics lesson 26: Sensors and actuators · Set 168 · 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 an LED? (a) open a gate to 90° (b) show a status light (c) move water to plants (d) beep an alarm
2. 2.True or false: to measure classroom noise, use a soil moisture sensor. (a) True (b) False
3. 3.🔍 Which sensor would you use to water a dry plant? (a) a light sensor (b) a rain sensor (c) a motion sensor (d) a soil moisture sensor
4. 4.True or false: to switch on with a clap, use a sound sensor. (a) False (b) True
5. 5.Which job needs a sound sensor? (a) warn of a gas leak (b) switch on lamps at dusk (c) open blinds at sunrise (d) switch on with a clap
6. 6.🔍 Which sensor would you use to switch on with a clap? (a) a motion sensor (b) a sound sensor (c) a temperature sensor (d) a distance sensor
7. 7.⚙️ Which actuator would you use to beep an alarm? (a) a buzzer (b) an LED (c) a display (d) a pump
8. 8.🔍 Which sensor would you use to open blinds at sunrise? (a) a soil moisture sensor (b) a motion sensor (c) a sound sensor (d) a light sensor
9. 9.⚙️ What is an actuator? (a) a sensor (b) a program (c) an output that acts (d) a battery
10. 10.Which job needs a light sensor? (a) open blinds at sunrise (b) water a dry plant (c) keep an incubator warm (d) stop a robot near walls
11. 11.True or false: to warn of a gas leak, use a distance sensor. (a) True (b) False
12. 12.🔍 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)?
13. 13.⚙️ Which actuator would you use to show the temperature? (a) a motor (b) a buzzer (c) a display (d) a pump
14. 14.Which job needs a pump? (a) show a status light (b) move water to plants (c) beep an alarm (d) turn to an exact angle
15. 15.🔍 An object is 221 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
16. 16.🔍 For a microcontroller, is a sensor an input or an output? (a) a fuse (b) an input (c) a power source (d) an output
17. 17.Which job needs a sound sensor? (a) switch on lamps at dusk (b) water a dry plant (c) measure classroom noise (d) spot someone walking in
18. 18.🔍 Which sensor would you use to start a fan when hot? (a) a rain sensor (b) a sound sensor (c) a motion sensor (d) a temperature sensor
19. 19.🔍 Which sensor would you use to close a window in rain? (a) a temperature sensor (b) a rain sensor (c) a soil moisture sensor (d) a gas sensor
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 job needs a buzzer? (a) show a status light (b) turn to an exact angle (c) beep an alarm (d) spin a robot’s wheels
22. 22.Which job needs a servo motor? (a) spin a robot’s wheels (b) open a gate to 90° (c) show the temperature (d) show a status light
23. 23.Which job needs a gas sensor? (a) spot someone walking in (b) warn of a gas leak (c) stop a robot near walls (d) keep an incubator warm
24. 24.⚙️ Which actuator would you use to turn to an exact angle? (a) an LED (b) a motor (c) a buzzer (d) a servo motor
25. 25.🔍 An object is 51 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
26. 26.⚙️ Which actuator would you use to spin a robot’s wheels? (a) an LED (b) a display (c) a pump (d) a motor
27. 27.Which job needs a distance sensor? (a) warn of a gas leak (b) open blinds at sunrise (c) switch on lamps at dusk (d) stop a robot near walls
28. 28.Which job needs a soil moisture sensor? (a) water a dry plant (b) open blinds at sunrise (c) start a fan when hot (d) switch on lamps at dusk
29. 29.🔍 Which sensor would you use to measure classroom noise? (a) a gas sensor (b) a sound sensor (c) a distance sensor (d) a temperature sensor
30. 30.Which job needs a rain sensor? (a) measure classroom noise (b) start a fan when hot (c) stop a robot near walls (d) close a window in rain
31. 31.⚙️ Which actuator would you use to move water to plants? (a) a pump (b) an LED (c) a motor (d) a buzzer
32. 32.⚙️ Which actuator would you use to open a gate to 90°? (a) an LED (b) a pump (c) a buzzer (d) a servo motor
33. 33.True or false: to start a fan when hot, use a temperature sensor. (a) False (b) True
34. 34.True or false: to switch on with a clap, use a distance sensor. (a) True (b) False
35. 35.🔍 Which sensor would you use to keep an incubator warm? (a) a soil moisture sensor (b) a distance sensor (c) a temperature sensor (d) a light sensor
36. 36.Which job needs a temperature sensor? (a) open blinds at sunrise (b) make a parking alarm (c) close a window in rain (d) start a fan when hot
37. 37.True or false: to close a window in rain, use a temperature sensor. (a) False (b) True
38. 38.Which job needs a motion sensor? (a) open blinds at sunrise (b) keep an incubator warm (c) spot someone walking in (d) water a dry plant
39. 39.True or false: to water a dry plant, use a temperature sensor. (a) False (b) True
40. 40.Which job needs a display? (a) show the temperature (b) turn to an exact angle (c) open a gate to 90° (d) spin a robot’s wheels

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