Electronics Worksheet: Sensors and Actuators

Electronics lesson 26: Sensors and actuators · Set 136 · 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 servo motor (b) a pump (c) a display (d) a buzzer
2. 2.🔍 For a microcontroller, is a sensor an input or an output? (a) an input (b) a fuse (c) an output (d) a power source
3. 3.Which job needs a pump? (a) spin a robot’s wheels (b) beep an alarm (c) show a status light (d) move water to plants
4. 4.🔍 Which sensor would you use to warn of a gas leak? (a) a rain sensor (b) a motion sensor (c) a light sensor (d) a gas sensor
5. 5.🔍 Which sensor would you use to measure classroom noise? (a) a soil moisture sensor (b) a sound sensor (c) a gas sensor (d) a motion sensor
6. 6.⚙️ What is an actuator? (a) an output that acts (b) a battery (c) a sensor (d) a program
7. 7.Which job needs a sound sensor? (a) spot someone walking in (b) switch on with a clap (c) keep an incubator warm (d) open blinds at sunrise
8. 8.Which job needs a buzzer? (a) move water to plants (b) beep an alarm (c) open a gate to 90° (d) turn to an exact angle
9. 9.Which job needs a distance sensor? (a) switch on lamps at dusk (b) open blinds at sunrise (c) switch on with a clap (d) make a parking alarm
10. 10.🔍 Which sensor would you use to open blinds at sunrise? (a) a rain sensor (b) a light sensor (c) a soil moisture sensor (d) a gas sensor
11. 11.True or false: to spot someone walking in, use a motion sensor. (a) False (b) True
12. 12.Which job needs a soil moisture sensor? (a) make a parking alarm (b) switch on with a clap (c) water a dry plant (d) start a fan when hot
13. 13.Which job needs a display? (a) show the temperature (b) move water to plants (c) spin a robot’s wheels (d) turn to an exact angle
14. 14.True or false: to stop a robot near walls, use a rain sensor. (a) False (b) True
15. 15.Which job needs a motor? (a) move water to plants (b) show the temperature (c) open a gate to 90° (d) spin a robot’s wheels
16. 16.🔍 Which sensor would you use to close a window in rain? (a) a distance sensor (b) a temperature sensor (c) a rain sensor (d) a light sensor
17. 17.🔍 An object is 68 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
18. 18.Which job needs a rain sensor? (a) close a window in rain (b) switch on lamps at dusk (c) spot someone walking in (d) water a dry plant
19. 19.🔍 A distance sensor sends a sound pulse and hears the echo 5 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
20. 20.Which job needs a sound sensor? (a) switch on lamps at dusk (b) measure classroom noise (c) start a fan when hot (d) keep an incubator warm
21. 21.🔍 Which sensor would you use to switch on lamps at dusk? (a) a light sensor (b) a distance sensor (c) a temperature sensor (d) a gas sensor
22. 22.🔍 Which sensor would you use to stop a robot near walls? (a) a sound sensor (b) a light sensor (c) a temperature sensor (d) a distance sensor
23. 23.🔍 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)?
24. 24.True or false: to open blinds at sunrise, use a light sensor. (a) True (b) False
25. 25.🔍 Which sensor would you use to keep an incubator warm? (a) a rain sensor (b) a distance sensor (c) a temperature sensor (d) a gas sensor
26. 26.🔍 Which sensor would you use to start a fan when hot? (a) a soil moisture sensor (b) a light sensor (c) a temperature sensor (d) a distance sensor
27. 27.Which job needs a distance sensor? (a) stop a robot near walls (b) measure classroom noise (c) start a fan when hot (d) switch on with a clap
28. 28.True or false: to keep an incubator warm, use a rain sensor. (a) False (b) True
29. 29.True or false: to keep an incubator warm, use a temperature sensor. (a) True (b) False
30. 30.⚙️ Which actuator would you use to show the temperature? (a) a motor (b) a buzzer (c) a display (d) a servo motor
31. 31.Which job needs a temperature sensor? (a) keep an incubator warm (b) make a parking alarm (c) open blinds at sunrise (d) spot someone walking in
32. 32.⚙️ Which actuator would you use to turn to an exact angle? (a) a motor (b) an LED (c) a pump (d) a servo motor
33. 33.⚙️ Which actuator would you use to open a gate to 90°? (a) an LED (b) a motor (c) a servo motor (d) a pump
34. 34.Which job needs a temperature sensor? (a) start a fan when hot (b) open blinds at sunrise (c) stop a robot near walls (d) close a window in rain
35. 35.🔍 An object is 255 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
36. 36.True or false: to close a window in rain, use a temperature sensor. (a) True (b) False
37. 37.True or false: to warn of a gas leak, use a gas sensor. (a) False (b) True
38. 38.🔍 Which sensor would you use to water a dry plant? (a) a gas sensor (b) a distance sensor (c) a soil moisture sensor (d) a light sensor
39. 39.Which job needs an LED? (a) show a status light (b) spin a robot’s wheels (c) beep an alarm (d) open a gate to 90°
40. 40.True or false: to water a dry plant, use a rain sensor. (a) False (b) True

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