Electronics Worksheet: Sensors and Actuators

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

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