Electronics Worksheet: Sensors and Actuators

Electronics lesson 26: Sensors and actuators · Set 233 · 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 water a dry plant? (a) a soil moisture sensor (b) a gas sensor (c) a motion sensor (d) a sound sensor
2. 2.Which job needs a temperature sensor? (a) switch on with a clap (b) close a window in rain (c) start a fan when hot (d) stop a robot near walls
3. 3.🔍 Which sensor would you use to close a window in rain? (a) a rain sensor (b) a motion sensor (c) a gas sensor (d) a sound sensor
4. 4.⚙️ Which actuator would you use to show a status light? (a) a buzzer (b) a display (c) a motor (d) an LED
5. 5.🔍 A distance sensor sends a sound pulse and hears the echo 19 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
6. 6.🔍 Which sensor would you use to make a parking alarm? (a) a gas sensor (b) a motion sensor (c) a distance sensor (d) a temperature sensor
7. 7.⚙️ Which actuator would you use to spin a robot’s wheels? (a) an LED (b) a servo motor (c) a buzzer (d) a motor
8. 8.🔍 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)?
9. 9.🔍 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?
10. 10.True or false: to open blinds at sunrise, use a temperature sensor. (a) False (b) True
11. 11.True or false: to switch on lamps at dusk, use a light sensor. (a) True (b) False
12. 12.Which job needs a sound sensor? (a) start a fan when hot (b) close a window in rain (c) water a dry plant (d) measure classroom noise
13. 13.Which job needs a motor? (a) spin a robot’s wheels (b) open a gate to 90° (c) show a status light (d) beep an alarm
14. 14.Which job needs a temperature sensor? (a) spot someone walking in (b) keep an incubator warm (c) switch on lamps at dusk (d) measure classroom noise
15. 15.Which job needs a light sensor? (a) keep an incubator warm (b) stop a robot near walls (c) switch on lamps at dusk (d) start a fan when hot
16. 16.True or false: to stop a robot near walls, use a temperature sensor. (a) False (b) True
17. 17.⚙️ Which actuator would you use to open a gate to 90°? (a) a servo motor (b) a buzzer (c) a pump (d) a motor
18. 18.🔍 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?
19. 19.🔍 For a microcontroller, is a sensor an input or an output? (a) a power source (b) an output (c) an input (d) a fuse
20. 20.Which job needs a sound sensor? (a) keep an incubator warm (b) switch on with a clap (c) start a fan when hot (d) switch on lamps at dusk
21. 21.True or false: to water a dry plant, use a soil moisture sensor. (a) False (b) True
22. 22.True or false: to close a window in rain, use a soil moisture sensor. (a) False (b) True
23. 23.Which job needs a rain sensor? (a) measure classroom noise (b) start a fan when hot (c) stop a robot near walls (d) close a window in rain
24. 24.⚙️ Which actuator would you use to move water to plants? (a) a servo motor (b) a buzzer (c) a pump (d) a motor
25. 25.🔍 Which sensor would you use to warn of a gas leak? (a) a gas sensor (b) a motion sensor (c) a rain sensor (d) a sound sensor
26. 26.⚙️ What is an actuator? (a) an output that acts (b) a sensor (c) a program (d) a battery
27. 27.Which job needs a distance sensor? (a) make a parking alarm (b) switch on lamps at dusk (c) warn of a gas leak (d) close a window in rain
28. 28.Which job needs an LED? (a) beep an alarm (b) spin a robot’s wheels (c) move water to plants (d) show a status light
29. 29.True or false: to water a dry plant, use a temperature sensor. (a) True (b) False
30. 30.Which job needs a buzzer? (a) spin a robot’s wheels (b) beep an alarm (c) turn to an exact angle (d) move water to plants
31. 31.Which job needs a gas sensor? (a) open blinds at sunrise (b) water a dry plant (c) warn of a gas leak (d) spot someone walking in
32. 32.🔍 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?
33. 33.⚙️ Which actuator would you use to beep an alarm? (a) an LED (b) a motor (c) a display (d) a buzzer
34. 34.🔍 A distance sensor sends a sound pulse and hears the echo 4 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
35. 35.🔍 Which sensor would you use to switch on lamps at dusk? (a) a gas sensor (b) a sound sensor (c) a light sensor (d) a distance sensor
36. 36.Which job needs a display? (a) beep an alarm (b) show the temperature (c) open a gate to 90° (d) move water to plants
37. 37.🔍 Which sensor would you use to keep an incubator warm? (a) a light sensor (b) a soil moisture sensor (c) a temperature sensor (d) a rain sensor
38. 38.🔍 Which sensor would you use to open blinds at sunrise? (a) a sound sensor (b) a light sensor (c) a temperature sensor (d) a soil moisture sensor
39. 39.🔍 An object is 170 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
40. 40.True or false: to start a fan when hot, use a temperature sensor. (a) False (b) True

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