Electronics Worksheet: Sensors and Actuators

Electronics lesson 26: Sensors and actuators · Set 275 · 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 gas sensor? (a) warn of a gas leak (b) stop a robot near walls (c) keep an incubator warm (d) switch on with a clap
2. 2.⚙️ Which actuator would you use to move water to plants? (a) a pump (b) a servo motor (c) a buzzer (d) an LED
3. 3.True or false: to switch on with a clap, use a gas sensor. (a) False (b) True
4. 4.⚙️ Which actuator would you use to open a gate to 90°? (a) a pump (b) a motor (c) a servo motor (d) a display
5. 5.🔍 An object is 204 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
6. 6.Which job needs an LED? (a) show the temperature (b) show a status light (c) open a gate to 90° (d) beep an alarm
7. 7.Which job needs a soil moisture sensor? (a) spot someone walking in (b) keep an incubator warm (c) water a dry plant (d) open blinds at sunrise
8. 8.⚙️ Which actuator would you use to show a status light? (a) a motor (b) a buzzer (c) an LED (d) a pump
9. 9.⚙️ Which actuator would you use to beep an alarm? (a) an LED (b) a display (c) a servo motor (d) a buzzer
10. 10.True or false: to make a parking alarm, use a distance sensor. (a) True (b) False
11. 11.True or false: to close a window in rain, use a motion sensor. (a) True (b) False
12. 12.⚙️ What is an actuator? (a) a program (b) an output that acts (c) a battery (d) a sensor
13. 13.🔍 Which sensor would you use to switch on lamps at dusk? (a) a light sensor (b) a gas sensor (c) a temperature sensor (d) a soil moisture sensor
14. 14.Which job needs a buzzer? (a) turn to an exact angle (b) show the temperature (c) beep an alarm (d) spin a robot’s wheels
15. 15.True or false: to open blinds at sunrise, use a light sensor. (a) False (b) True
16. 16.Which job needs a rain sensor? (a) switch on with a clap (b) warn of a gas leak (c) switch on lamps at dusk (d) close a window in rain
17. 17.🔍 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)?
18. 18.🔍 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?
19. 19.Which job needs a motor? (a) beep an alarm (b) spin a robot’s wheels (c) open a gate to 90° (d) turn to an exact angle
20. 20.⚙️ Which actuator would you use to show the temperature? (a) an LED (b) a buzzer (c) a motor (d) a display
21. 21.🔍 A distance sensor sends a sound pulse and hears the echo 20 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
22. 22.Which job needs a display? (a) show the temperature (b) spin a robot’s wheels (c) open a gate to 90° (d) show a status light
23. 23.🔍 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?
24. 24.🔍 Which sensor would you use to spot someone walking in? (a) a temperature sensor (b) a light sensor (c) a motion sensor (d) a rain sensor
25. 25.🔍 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)?
26. 26.🔍 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)?
27. 27.🔍 For a microcontroller, is a sensor an input or an output? (a) an output (b) a power source (c) an input (d) a fuse
28. 28.Which job needs a servo motor? (a) move water to plants (b) show a status light (c) open a gate to 90° (d) beep an alarm
29. 29.🔍 Which sensor would you use to start a fan when hot? (a) a soil moisture sensor (b) a distance sensor (c) a temperature sensor (d) a light sensor
30. 30.🔍 Which sensor would you use to keep an incubator warm? (a) a sound sensor (b) a light sensor (c) a gas sensor (d) a temperature sensor
31. 31.🔍 Which sensor would you use to make a parking alarm? (a) a rain sensor (b) a temperature sensor (c) a distance sensor (d) a motion sensor
32. 32.🔍 Which sensor would you use to measure classroom noise? (a) a gas sensor (b) a sound sensor (c) a light sensor (d) a temperature sensor
33. 33.True or false: to keep an incubator warm, use a soil moisture sensor. (a) False (b) True
34. 34.🔍 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)?
35. 35.Which job needs a motion sensor? (a) keep an incubator warm (b) measure classroom noise (c) spot someone walking in (d) open blinds at sunrise
36. 36.Which job needs a temperature sensor? (a) make a parking alarm (b) warn of a gas leak (c) switch on lamps at dusk (d) keep an incubator warm
37. 37.Which job needs a sound sensor? (a) open blinds at sunrise (b) switch on lamps at dusk (c) make a parking alarm (d) switch on with a clap
38. 38.🔍 Which sensor would you use to stop a robot near walls? (a) a sound sensor (b) a distance sensor (c) a motion sensor (d) a rain sensor
39. 39.True or false: to keep an incubator warm, use a motion sensor. (a) True (b) False
40. 40.🔍 Which sensor would you use to open blinds at sunrise? (a) a motion sensor (b) a rain sensor (c) a soil moisture sensor (d) a light sensor

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