Electronics Worksheet: Sensors and Actuators

Electronics lesson 26: Sensors and actuators · Set 85 · 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 switch on lamps at dusk? (a) a distance sensor (b) a soil moisture sensor (c) a motion sensor (d) a light sensor
2. 2.⚙️ What is an actuator? (a) a sensor (b) an output that acts (c) a battery (d) a program
3. 3.True or false: to make a parking alarm, use a distance sensor. (a) False (b) True
4. 4.True or false: to make a parking alarm, use a gas sensor. (a) True (b) False
5. 5.True or false: to switch on with a clap, use a sound sensor. (a) True (b) False
6. 6.🔍 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)?
7. 7.🔍 An object is 85 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 buzzer? (a) move water to plants (b) show a status light (c) show the temperature (d) beep an alarm
9. 9.🔍 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)?
10. 10.⚙️ Which actuator would you use to show the temperature? (a) a motor (b) a servo motor (c) a pump (d) a display
11. 11.🔍 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?
12. 12.🔍 Which sensor would you use to open blinds at sunrise? (a) a distance sensor (b) a soil moisture sensor (c) a motion sensor (d) a light sensor
13. 13.⚙️ Which actuator would you use to open a gate to 90°? (a) a motor (b) a servo motor (c) a pump (d) a display
14. 14.Which job needs a pump? (a) show the temperature (b) spin a robot’s wheels (c) open a gate to 90° (d) move water to plants
15. 15.🔍 Which sensor would you use to stop a robot near walls? (a) a soil moisture sensor (b) a temperature sensor (c) a distance sensor (d) a light sensor
16. 16.Which job needs a rain sensor? (a) start a fan when hot (b) close a window in rain (c) water a dry plant (d) switch on with a clap
17. 17.⚙️ Which actuator would you use to move water to plants? (a) a buzzer (b) a display (c) a servo motor (d) a pump
18. 18.🔍 Which sensor would you use to switch on with a clap? (a) a sound sensor (b) a motion sensor (c) a light sensor (d) a gas sensor
19. 19.Which job needs a servo motor? (a) spin a robot’s wheels (b) move water to plants (c) beep an alarm (d) turn to an exact angle
20. 20.True or false: to spot someone walking in, use a motion sensor. (a) False (b) True
21. 21.Which job needs a temperature sensor? (a) close a window in rain (b) make a parking alarm (c) start a fan when hot (d) switch on lamps at dusk
22. 22.⚙️ Which actuator would you use to show a status light? (a) a motor (b) a buzzer (c) an LED (d) a servo motor
23. 23.🔍 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)?
24. 24.🔍 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?
25. 25.🔍 Which sensor would you use to make a parking alarm? (a) a light sensor (b) a distance sensor (c) a soil moisture sensor (d) a rain sensor
26. 26.🔍 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?
27. 27.🔍 Which sensor would you use to measure classroom noise? (a) a sound sensor (b) a gas sensor (c) a light sensor (d) a temperature sensor
28. 28.🔍 A distance sensor sends a sound pulse and hears the echo 20 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
29. 29.🔍 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)?
30. 30.🔍 For a microcontroller, is a sensor an input or an output? (a) a power source (b) a fuse (c) an input (d) an output
31. 31.🔍 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)?
32. 32.🔍 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?
33. 33.🔍 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?
34. 34.🔍 Which sensor would you use to keep an incubator warm? (a) a soil moisture sensor (b) a temperature sensor (c) a distance sensor (d) a gas sensor
35. 35.Which job needs a gas sensor? (a) spot someone walking in (b) start a fan when hot (c) warn of a gas leak (d) switch on with a clap
36. 36.True or false: to measure classroom noise, use a gas sensor. (a) True (b) False
37. 37.Which job needs a light sensor? (a) close a window in rain (b) keep an incubator warm (c) switch on lamps at dusk (d) water a dry plant
38. 38.Which job needs a distance sensor? (a) water a dry plant (b) spot someone walking in (c) make a parking alarm (d) close a window in rain
39. 39.⚙️ Which actuator would you use to beep an alarm? (a) a motor (b) a pump (c) a servo motor (d) a buzzer
40. 40.Which job needs a sound sensor? (a) warn of a gas leak (b) water a dry plant (c) open blinds at sunrise (d) switch on with a clap

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