Electronics Worksheet: Sensors and Actuators

Electronics lesson 26: Sensors and actuators · Set 54 · 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 warn of a gas leak? (a) a gas sensor (b) a sound sensor (c) a light sensor (d) a rain sensor
2. 2.Which job needs a distance sensor? (a) start a fan when hot (b) water a dry plant (c) measure classroom noise (d) make a parking alarm
3. 3.🔍 Which sensor would you use to switch on with a clap? (a) a soil moisture sensor (b) a rain sensor (c) a distance sensor (d) a sound sensor
4. 4.⚙️ Which actuator would you use to show a status light? (a) an LED (b) a display (c) a pump (d) a buzzer
5. 5.True or false: to make a parking alarm, use a distance sensor. (a) False (b) True
6. 6.True or false: to close a window in rain, use a rain sensor. (a) False (b) True
7. 7.Which job needs a light sensor? (a) start a fan when hot (b) switch on lamps at dusk (c) make a parking alarm (d) switch on with a clap
8. 8.True or false: to water a dry plant, use a light sensor. (a) True (b) False
9. 9.⚙️ What is an actuator? (a) a battery (b) a program (c) a sensor (d) an output that acts
10. 10.True or false: to keep an incubator warm, use a temperature sensor. (a) False (b) True
11. 11.True or false: to keep an incubator warm, use a sound sensor. (a) True (b) False
12. 12.🔍 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?
13. 13.Which job needs a motion sensor? (a) switch on with a clap (b) water a dry plant (c) close a window in rain (d) spot someone walking in
14. 14.True or false: to close a window in rain, use a distance sensor. (a) True (b) False
15. 15.Which job needs a pump? (a) show the temperature (b) turn to an exact angle (c) move water to plants (d) beep an alarm
16. 16.True or false: to stop a robot near walls, use a distance sensor. (a) False (b) True
17. 17.🔍 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)?
18. 18.Which job needs a temperature sensor? (a) switch on lamps at dusk (b) open blinds at sunrise (c) close a window in rain (d) start a fan when hot
19. 19.Which job needs a gas sensor? (a) warn of a gas leak (b) start a fan when hot (c) make a parking alarm (d) switch on with a clap
20. 20.🔍 For a microcontroller, is a sensor an input or an output? (a) an output (b) an input (c) a fuse (d) a power source
21. 21.Which job needs a distance sensor? (a) switch on with a clap (b) water a dry plant (c) open blinds at sunrise (d) stop a robot near walls
22. 22.Which job needs a motor? (a) turn to an exact angle (b) move water to plants (c) open a gate to 90° (d) spin a robot’s wheels
23. 23.🔍 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?
24. 24.🔍 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)?
25. 25.True or false: to water a dry plant, use a soil moisture sensor. (a) True (b) False
26. 26.Which job needs a buzzer? (a) beep an alarm (b) show the temperature (c) move water to plants (d) spin a robot’s wheels
27. 27.🔍 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)?
28. 28.⚙️ Which actuator would you use to spin a robot’s wheels? (a) a pump (b) an LED (c) a display (d) a motor
29. 29.🔍 An object is 51 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
30. 30.🔍 Which sensor would you use to stop a robot near walls? (a) a sound sensor (b) a soil moisture sensor (c) a rain sensor (d) a distance sensor
31. 31.🔍 A distance sensor sends a sound pulse and hears the echo 9 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
32. 32.Which job needs a temperature sensor? (a) stop a robot near walls (b) make a parking alarm (c) keep an incubator warm (d) switch on lamps at dusk
33. 33.True or false: to start a fan when hot, use a temperature sensor. (a) False (b) True
34. 34.🔍 Which sensor would you use to close a window in rain? (a) a gas sensor (b) a sound sensor (c) a rain sensor (d) a soil moisture sensor
35. 35.True or false: to warn of a gas leak, use a gas sensor. (a) False (b) True
36. 36.🔍 A distance sensor sends a sound pulse and hears the echo 2 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
37. 37.🔍 Which sensor would you use to make a parking alarm? (a) a sound sensor (b) a temperature sensor (c) a distance sensor (d) a light sensor
38. 38.⚙️ Which actuator would you use to beep an alarm? (a) a display (b) a buzzer (c) a servo motor (d) a motor
39. 39.Which job needs a rain sensor? (a) open blinds at sunrise (b) switch on lamps at dusk (c) close a window in rain (d) keep an incubator warm
40. 40.Which job needs an LED? (a) turn to an exact angle (b) spin a robot’s wheels (c) move water to plants (d) show a status light

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