Electronics Worksheet: Sensors and Actuators

Electronics lesson 26: Sensors and actuators · Set 345 · 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.True or false: to switch on lamps at dusk, use a sound sensor. (a) False (b) True
2. 2.🔍 A distance sensor sends a sound pulse and hears the echo 3 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 sensor (b) a program (c) a battery (d) an output that acts
4. 4.True or false: to spot someone walking in, use a motion sensor. (a) False (b) True
5. 5.Which job needs a display? (a) move water to plants (b) turn to an exact angle (c) show the temperature (d) beep an alarm
6. 6.🔍 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?
7. 7.🔍 Which sensor would you use to warn of a gas leak? (a) a rain sensor (b) a light sensor (c) a motion sensor (d) a gas sensor
8. 8.Which job needs a pump? (a) open a gate to 90° (b) beep an alarm (c) turn to an exact angle (d) move water to plants
9. 9.Which job needs a sound sensor? (a) switch on lamps at dusk (b) switch on with a clap (c) warn of a gas leak (d) keep an incubator warm
10. 10.🔍 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)?
11. 11.Which job needs a buzzer? (a) beep an alarm (b) show a status light (c) open a gate to 90° (d) spin a robot’s wheels
12. 12.⚙️ Which actuator would you use to move water to plants? (a) a pump (b) an LED (c) a servo motor (d) a buzzer
13. 13.🔍 A distance sensor sends a sound pulse and hears the echo 17 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
14. 14.🔍 For a microcontroller, is a sensor an input or an output? (a) an input (b) a power source (c) an output (d) a fuse
15. 15.True or false: to keep an incubator warm, use a temperature sensor. (a) False (b) True
16. 16.🔍 Which sensor would you use to stop a robot near walls? (a) a sound sensor (b) a soil moisture sensor (c) a distance sensor (d) a motion sensor
17. 17.Which job needs a soil moisture sensor? (a) close a window in rain (b) water a dry plant (c) measure classroom noise (d) switch on lamps at dusk
18. 18.True or false: to stop a robot near walls, use a light sensor. (a) False (b) True
19. 19.🔍 Which sensor would you use to make a parking alarm? (a) a temperature sensor (b) a soil moisture sensor (c) a light sensor (d) a distance sensor
20. 20.⚙️ Which actuator would you use to open a gate to 90°? (a) a buzzer (b) a motor (c) a pump (d) a servo motor
21. 21.🔍 A distance sensor sends a sound pulse and hears the echo 10 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
22. 22.Which job needs a motor? (a) move water to plants (b) spin a robot’s wheels (c) show the temperature (d) beep an alarm
23. 23.⚙️ Which actuator would you use to show the temperature? (a) an LED (b) a display (c) a servo motor (d) a pump
24. 24.True or false: to start a fan when hot, use a temperature sensor. (a) False (b) True
25. 25.True or false: to make a parking alarm, use a distance sensor. (a) True (b) False
26. 26.True or false: to measure classroom noise, use a sound sensor. (a) False (b) True
27. 27.Which job needs a sound sensor? (a) open blinds at sunrise (b) close a window in rain (c) warn of a gas leak (d) measure classroom noise
28. 28.True or false: to spot someone walking in, use a temperature sensor. (a) True (b) False
29. 29.True or false: to start a fan when hot, use a sound sensor. (a) True (b) False
30. 30.🔍 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)?
31. 31.🔍 Which sensor would you use to close a window in rain? (a) a sound sensor (b) a gas sensor (c) a rain sensor (d) a temperature sensor
32. 32.True or false: to open blinds at sunrise, use a soil moisture sensor. (a) False (b) True
33. 33.⚙️ Which actuator would you use to beep an alarm? (a) a display (b) a buzzer (c) a servo motor (d) a motor
34. 34.True or false: to make a parking alarm, use a temperature sensor. (a) True (b) False
35. 35.🔍 A distance sensor sends a sound pulse and hears the echo 13 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
36. 36.🔍 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)?
37. 37.🔍 Which sensor would you use to spot someone walking in? (a) a motion sensor (b) a distance sensor (c) a light sensor (d) a temperature sensor
38. 38.🔍 Which sensor would you use to open blinds at sunrise? (a) a distance sensor (b) a gas sensor (c) a soil moisture sensor (d) a light sensor
39. 39.🔍 Which sensor would you use to keep an incubator warm? (a) a soil moisture sensor (b) a rain sensor (c) a distance sensor (d) a temperature sensor
40. 40.⚙️ Which actuator would you use to spin a robot’s wheels? (a) an LED (b) a pump (c) a motor (d) a buzzer

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