Electronics Worksheet: Sensors and Actuators

Electronics lesson 26: Sensors and actuators · Set 211 · 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 warn of a gas leak? (a) a gas sensor (b) a soil moisture sensor (c) a rain sensor (d) a light sensor
2. 2.True or false: to keep an incubator warm, use a distance sensor. (a) False (b) True
3. 3.Which job needs a rain sensor? (a) switch on lamps at dusk (b) close a window in rain (c) keep an incubator warm (d) make a parking alarm
4. 4.Which job needs a pump? (a) spin a robot’s wheels (b) move water to plants (c) turn to an exact angle (d) show the temperature
5. 5.True or false: to keep an incubator warm, use a gas sensor. (a) True (b) False
6. 6.🔍 For a microcontroller, is a sensor an input or an output? (a) an input (b) a power source (c) an output (d) a fuse
7. 7.True or false: to stop a robot near walls, use a motion sensor. (a) True (b) False
8. 8.True or false: to make a parking alarm, use a soil moisture sensor. (a) False (b) True
9. 9.Which job needs a motor? (a) spin a robot’s wheels (b) turn to an exact angle (c) beep an alarm (d) show the temperature
10. 10.⚙️ Which actuator would you use to turn to an exact angle? (a) a buzzer (b) a servo motor (c) a motor (d) a pump
11. 11.True or false: to warn of a gas leak, use a gas sensor. (a) False (b) True
12. 12.True or false: to water a dry plant, use a gas sensor. (a) False (b) True
13. 13.Which job needs a display? (a) move water to plants (b) open a gate to 90° (c) show the temperature (d) show a status light
14. 14.Which job needs a servo motor? (a) beep an alarm (b) show the temperature (c) show a status light (d) turn to an exact angle
15. 15.True or false: to spot someone walking in, use a light sensor. (a) False (b) True
16. 16.Which job needs a gas sensor? (a) warn of a gas leak (b) stop a robot near walls (c) close a window in rain (d) start a fan when hot
17. 17.Which job needs a servo motor? (a) beep an alarm (b) move water to plants (c) open a gate to 90° (d) spin a robot’s wheels
18. 18.🔍 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)?
19. 19.Which job needs a buzzer? (a) beep an alarm (b) turn to an exact angle (c) open a gate to 90° (d) show the temperature
20. 20.🔍 Which sensor would you use to start a fan when hot? (a) a rain sensor (b) a temperature sensor (c) a sound sensor (d) a light sensor
21. 21.Which job needs a motion sensor? (a) spot someone walking in (b) measure classroom noise (c) close a window in rain (d) stop a robot near walls
22. 22.🔍 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)?
23. 23.🔍 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)?
24. 24.True or false: to measure classroom noise, use a temperature sensor. (a) True (b) False
25. 25.🔍 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?
26. 26.🔍 Which sensor would you use to keep an incubator warm? (a) a temperature sensor (b) a soil moisture sensor (c) a motion sensor (d) a sound sensor
27. 27.🔍 Which sensor would you use to spot someone walking in? (a) a distance sensor (b) a soil moisture sensor (c) a rain sensor (d) a motion sensor
28. 28.True or false: to open blinds at sunrise, use a distance sensor. (a) True (b) False
29. 29.🔍 A distance sensor sends a sound pulse and hears the echo 12 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
30. 30.🔍 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?
31. 31.🔍 Which sensor would you use to switch on with a clap? (a) a soil moisture sensor (b) a motion sensor (c) a sound sensor (d) a distance sensor
32. 32.🔍 Which sensor would you use to stop a robot near walls? (a) a rain sensor (b) a distance sensor (c) a soil moisture sensor (d) a gas sensor
33. 33.🔍 An object is 153 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
34. 34.⚙️ Which actuator would you use to beep an alarm? (a) an LED (b) a buzzer (c) a pump (d) a motor
35. 35.True or false: to warn of a gas leak, use a temperature sensor. (a) True (b) False
36. 36.⚙️ What is an actuator? (a) a program (b) an output that acts (c) a sensor (d) a battery
37. 37.True or false: to start a fan when hot, use a soil moisture sensor. (a) False (b) True
38. 38.⚙️ Which actuator would you use to move water to plants? (a) an LED (b) a buzzer (c) a servo motor (d) a pump
39. 39.Which job needs a light sensor? (a) start a fan when hot (b) measure classroom noise (c) keep an incubator warm (d) open blinds at sunrise
40. 40.⚙️ Which actuator would you use to show a status light? (a) a pump (b) a motor (c) a buzzer (d) an LED

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