Electronics Worksheet: Sensors and Actuators

Electronics lesson 26: Sensors and actuators · Set 339 · 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.🔍 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?
2. 2.Which job needs a pump? (a) move water to plants (b) turn to an exact angle (c) open a gate to 90° (d) spin a robot’s wheels
3. 3.Which job needs a distance sensor? (a) keep an incubator warm (b) measure classroom noise (c) stop a robot near walls (d) warn of a gas leak
4. 4.🔍 A distance sensor sends a sound pulse and hears the echo 16 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
5. 5.True or false: to close a window in rain, use a temperature sensor. (a) False (b) True
6. 6.⚙️ Which actuator would you use to turn to an exact angle? (a) a display (b) a motor (c) a servo motor (d) a buzzer
7. 7.True or false: to warn of a gas leak, use a rain sensor. (a) False (b) True
8. 8.⚙️ Which actuator would you use to show the temperature? (a) a servo motor (b) a buzzer (c) a pump (d) a display
9. 9.True or false: to start a fan when hot, use a rain sensor. (a) False (b) True
10. 10.🔍 Which sensor would you use to measure classroom noise? (a) a gas sensor (b) a temperature sensor (c) a distance sensor (d) a sound sensor
11. 11.🔍 For a microcontroller, is a sensor an input or an output? (a) an output (b) a power source (c) a fuse (d) an input
12. 12.Which job needs a temperature sensor? (a) switch on lamps at dusk (b) switch on with a clap (c) keep an incubator warm (d) stop a robot near walls
13. 13.Which job needs a light sensor? (a) stop a robot near walls (b) switch on with a clap (c) open blinds at sunrise (d) close a window in rain
14. 14.🔍 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?
15. 15.True or false: to spot someone walking in, use a motion sensor. (a) True (b) False
16. 16.Which job needs a distance sensor? (a) close a window in rain (b) start a fan when hot (c) make a parking alarm (d) open blinds at sunrise
17. 17.True or false: to keep an incubator warm, use a distance sensor. (a) True (b) False
18. 18.🔍 Which sensor would you use to open blinds at sunrise? (a) a gas sensor (b) a distance sensor (c) a light sensor (d) a sound sensor
19. 19.⚙️ What is an actuator? (a) a battery (b) a sensor (c) an output that acts (d) a program
20. 20.🔍 Which sensor would you use to water a dry plant? (a) a light sensor (b) a distance sensor (c) a soil moisture sensor (d) a motion sensor
21. 21.⚙️ Which actuator would you use to move water to plants? (a) a display (b) a pump (c) a buzzer (d) an LED
22. 22.Which job needs a buzzer? (a) beep an alarm (b) open a gate to 90° (c) spin a robot’s wheels (d) turn to an exact angle
23. 23.⚙️ Which actuator would you use to open a gate to 90°? (a) a display (b) a pump (c) a servo motor (d) a buzzer
24. 24.Which job needs a gas sensor? (a) water a dry plant (b) measure classroom noise (c) open blinds at sunrise (d) warn of a gas leak
25. 25.Which job needs a soil moisture sensor? (a) keep an incubator warm (b) measure classroom noise (c) water a dry plant (d) stop a robot near walls
26. 26.🔍 An object is 306 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
27. 27.Which job needs a temperature sensor? (a) switch on with a clap (b) start a fan when hot (c) switch on lamps at dusk (d) stop a robot near walls
28. 28.Which job needs a servo motor? (a) open a gate to 90° (b) move water to plants (c) show the temperature (d) spin a robot’s wheels
29. 29.Which job needs a sound sensor? (a) open blinds at sunrise (b) close a window in rain (c) switch on lamps at dusk (d) measure classroom noise
30. 30.🔍 Which sensor would you use to switch on with a clap? (a) a soil moisture sensor (b) a sound sensor (c) a light sensor (d) a gas sensor
31. 31.Which job needs a motor? (a) open a gate to 90° (b) spin a robot’s wheels (c) beep an alarm (d) move water to plants
32. 32.Which job needs a motion sensor? (a) make a parking alarm (b) switch on with a clap (c) spot someone walking in (d) start a fan when hot
33. 33.True or false: to stop a robot near walls, use a distance sensor. (a) True (b) False
34. 34.True or false: to switch on lamps at dusk, use a light sensor. (a) False (b) True
35. 35.🔍 An object is 238 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
36. 36.Which job needs a light sensor? (a) close a window in rain (b) keep an incubator warm (c) spot someone walking in (d) switch on lamps at dusk
37. 37.🔍 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?
38. 38.🔍 Which sensor would you use to start a fan when hot? (a) a temperature sensor (b) a soil moisture sensor (c) a light sensor (d) a motion sensor
39. 39.Which job needs a rain sensor? (a) switch on with a clap (b) open blinds at sunrise (c) measure classroom noise (d) close a window in rain
40. 40.Which job needs a display? (a) show a status light (b) move water to plants (c) turn to an exact angle (d) show the temperature

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