Electronics Worksheet: Sensors and Actuators

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

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