Electronics Worksheet: Sensors and Actuators

Electronics lesson 26: Sensors and actuators · Set 281 · 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 close a window in rain? (a) a light sensor (b) a rain sensor (c) a gas sensor (d) a distance sensor
2. 2.🔍 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)?
3. 3.Which job needs a temperature sensor? (a) water a dry plant (b) open blinds at sunrise (c) keep an incubator warm (d) make a parking alarm
4. 4.🔍 For a microcontroller, is a sensor an input or an output? (a) an input (b) an output (c) a fuse (d) a power source
5. 5.🔍 Which sensor would you use to stop a robot near walls? (a) a gas sensor (b) a distance sensor (c) a temperature sensor (d) a motion sensor
6. 6.⚙️ Which actuator would you use to spin a robot’s wheels? (a) a display (b) an LED (c) a pump (d) a motor
7. 7.⚙️ What is an actuator? (a) a battery (b) an output that acts (c) a program (d) a sensor
8. 8.🔍 Which sensor would you use to spot someone walking in? (a) a motion sensor (b) a gas sensor (c) a soil moisture sensor (d) a rain sensor
9. 9.Which job needs a distance sensor? (a) measure classroom noise (b) open blinds at sunrise (c) start a fan when hot (d) stop a robot near walls
10. 10.Which job needs a gas sensor? (a) switch on with a clap (b) warn of a gas leak (c) water a dry plant (d) keep an incubator warm
11. 11.Which job needs a buzzer? (a) show a status light (b) spin a robot’s wheels (c) beep an alarm (d) turn to an exact angle
12. 12.Which job needs a motor? (a) show a status light (b) spin a robot’s wheels (c) open a gate to 90° (d) turn to an exact angle
13. 13.Which job needs a light sensor? (a) water a dry plant (b) close a window in rain (c) switch on lamps at dusk (d) keep an incubator warm
14. 14.⚙️ Which actuator would you use to show a status light? (a) a buzzer (b) a pump (c) an LED (d) a motor
15. 15.🔍 A distance sensor sends a sound pulse and hears the echo 10 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
16. 16.🔍 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?
17. 17.🔍 Which sensor would you use to switch on lamps at dusk? (a) a light sensor (b) a gas sensor (c) a sound sensor (d) a motion sensor
18. 18.⚙️ Which actuator would you use to turn to an exact angle? (a) a motor (b) a display (c) a servo motor (d) an LED
19. 19.Which job needs a display? (a) beep an alarm (b) spin a robot’s wheels (c) show the temperature (d) turn to an exact angle
20. 20.True or false: to keep an incubator warm, use a temperature sensor. (a) False (b) True
21. 21.Which job needs a light sensor? (a) close a window in rain (b) open blinds at sunrise (c) keep an incubator warm (d) switch on with a clap
22. 22.Which job needs a servo motor? (a) turn to an exact angle (b) spin a robot’s wheels (c) move water to plants (d) show the temperature
23. 23.🔍 A distance sensor sends a sound pulse and hears the echo 15 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
24. 24.⚙️ Which actuator would you use to open a gate to 90°? (a) an LED (b) a servo motor (c) a display (d) a pump
25. 25.⚙️ Which actuator would you use to beep an alarm? (a) a servo motor (b) a pump (c) a buzzer (d) a display
26. 26.🔍 Which sensor would you use to measure classroom noise? (a) a light sensor (b) a motion sensor (c) a sound sensor (d) a distance sensor
27. 27.🔍 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?
28. 28.Which job needs a temperature sensor? (a) switch on with a clap (b) start a fan when hot (c) stop a robot near walls (d) switch on lamps at dusk
29. 29.🔍 An object is 119 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
30. 30.True or false: to start a fan when hot, use a sound sensor. (a) True (b) False
31. 31.Which job needs a motion sensor? (a) start a fan when hot (b) switch on lamps at dusk (c) switch on with a clap (d) spot someone walking in
32. 32.🔍 Which sensor would you use to water a dry plant? (a) a sound sensor (b) a soil moisture sensor (c) a light sensor (d) a temperature sensor
33. 33.True or false: to spot someone walking in, use a motion sensor. (a) True (b) False
34. 34.🔍 An object is 102 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
35. 35.True or false: to measure classroom noise, use a sound sensor. (a) False (b) True
36. 36.🔍 A distance sensor sends a sound pulse and hears the echo 8 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
37. 37.Which job needs a pump? (a) turn to an exact angle (b) move water to plants (c) open a gate to 90° (d) show a status light
38. 38.🔍 An object is 323 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
39. 39.True or false: to make a parking alarm, use a sound sensor. (a) True (b) False
40. 40.Which job needs a distance sensor? (a) switch on with a clap (b) warn of a gas leak (c) switch on lamps at dusk (d) make a parking alarm

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