Electronics Worksheet: Sensors and Actuators

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

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