Electronics Worksheet: Sensors and Actuators

Electronics lesson 26: Sensors and actuators · Set 100 · 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 distance sensor? (a) switch on with a clap (b) make a parking alarm (c) open blinds at sunrise (d) start a fan when hot
2. 2.⚙️ Which actuator would you use to show the temperature? (a) a servo motor (b) a display (c) a motor (d) a buzzer
3. 3.🔍 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)?
4. 4.⚙️ What is an actuator? (a) a sensor (b) an output that acts (c) a program (d) a battery
5. 5.Which job needs a gas sensor? (a) keep an incubator warm (b) warn of a gas leak (c) close a window in rain (d) spot someone walking in
6. 6.True or false: to stop a robot near walls, use a light sensor. (a) True (b) False
7. 7.True or false: to start a fan when hot, use a temperature sensor. (a) False (b) True
8. 8.⚙️ Which actuator would you use to turn to an exact angle? (a) a servo motor (b) a motor (c) a display (d) a pump
9. 9.Which job needs a sound sensor? (a) water a dry plant (b) warn of a gas leak (c) make a parking alarm (d) switch on with a clap
10. 10.🔍 For a microcontroller, is a sensor an input or an output? (a) an input (b) an output (c) a fuse (d) a power source
11. 11.⚙️ Which actuator would you use to beep an alarm? (a) a display (b) a buzzer (c) a servo motor (d) a motor
12. 12.🔍 Which sensor would you use to measure classroom noise? (a) a rain sensor (b) a light sensor (c) a motion sensor (d) a sound sensor
13. 13.Which job needs a soil moisture sensor? (a) make a parking alarm (b) water a dry plant (c) close a window in rain (d) measure classroom noise
14. 14.Which job needs a motor? (a) move water to plants (b) show the temperature (c) show a status light (d) spin a robot’s wheels
15. 15.Which job needs a display? (a) open a gate to 90° (b) show the temperature (c) spin a robot’s wheels (d) move water to plants
16. 16.🔍 Which sensor would you use to water a dry plant? (a) a soil moisture sensor (b) a distance sensor (c) a motion sensor (d) a light sensor
17. 17.Which job needs a distance sensor? (a) warn of a gas leak (b) close a window in rain (c) measure classroom noise (d) stop a robot near walls
18. 18.True or false: to spot someone walking in, use a rain sensor. (a) True (b) False
19. 19.Which job needs a temperature sensor? (a) measure classroom noise (b) keep an incubator warm (c) spot someone walking in (d) open blinds at sunrise
20. 20.Which job needs a buzzer? (a) show a status light (b) show the temperature (c) turn to an exact angle (d) beep an alarm
21. 21.Which job needs a rain sensor? (a) water a dry plant (b) start a fan when hot (c) stop a robot near walls (d) close a window in rain
22. 22.⚙️ Which actuator would you use to move water to plants? (a) an LED (b) a motor (c) a pump (d) a display
23. 23.⚙️ Which actuator would you use to show a status light? (a) a motor (b) a servo motor (c) an LED (d) a display
24. 24.Which job needs a pump? (a) spin a robot’s wheels (b) open a gate to 90° (c) move water to plants (d) turn to an exact angle
25. 25.🔍 Which sensor would you use to open blinds at sunrise? (a) a motion sensor (b) a gas sensor (c) a sound sensor (d) a light sensor
26. 26.🔍 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?
27. 27.🔍 Which sensor would you use to start a fan when hot? (a) a light sensor (b) a soil moisture sensor (c) a temperature sensor (d) a distance sensor
28. 28.True or false: to make a parking alarm, use a distance sensor. (a) False (b) True
29. 29.🔍 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?
30. 30.Which job needs a temperature sensor? (a) close a window in rain (b) switch on lamps at dusk (c) start a fan when hot (d) make a parking alarm
31. 31.True or false: to close a window in rain, use a temperature sensor. (a) True (b) False
32. 32.🔍 Which sensor would you use to close a window in rain? (a) a gas sensor (b) a sound sensor (c) a motion sensor (d) a rain sensor
33. 33.Which job needs a light sensor? (a) water a dry plant (b) open blinds at sunrise (c) stop a robot near walls (d) make a parking alarm
34. 34.🔍 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?
35. 35.⚙️ Which actuator would you use to spin a robot’s wheels? (a) an LED (b) a motor (c) a buzzer (d) a pump
36. 36.🔍 A distance sensor sends a sound pulse and hears the echo 1 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
37. 37.Which job needs an LED? (a) spin a robot’s wheels (b) show the temperature (c) show a status light (d) move water to plants
38. 38.🔍 Which sensor would you use to keep an incubator warm? (a) a sound sensor (b) a rain sensor (c) a temperature sensor (d) a motion sensor
39. 39.🔍 Which sensor would you use to switch on with a clap? (a) a gas sensor (b) a distance sensor (c) a light sensor (d) a sound sensor
40. 40.Which job needs a motion sensor? (a) keep an incubator warm (b) spot someone walking in (c) open blinds at sunrise (d) start a fan when hot

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