Electronics Worksheet: Sensors and Actuators

Electronics lesson 26: Sensors and actuators · Set 67 · 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 temperature sensor (b) a soil moisture sensor (c) a sound sensor (d) a gas sensor
2. 2.Which job needs a pump? (a) move water to plants (b) spin a robot’s wheels (c) show the temperature (d) turn to an exact angle
3. 3.Which job needs a rain sensor? (a) close a window in rain (b) stop a robot near walls (c) keep an incubator warm (d) open blinds at sunrise
4. 4.True or false: to water a dry plant, use a motion sensor. (a) False (b) True
5. 5.🔍 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)?
6. 6.⚙️ What is an actuator? (a) an output that acts (b) a battery (c) a program (d) a sensor
7. 7.🔍 For a microcontroller, is a sensor an input or an output? (a) a fuse (b) an output (c) an input (d) a power source
8. 8.🔍 Which sensor would you use to start a fan when hot? (a) a soil moisture sensor (b) a temperature sensor (c) a rain sensor (d) a motion sensor
9. 9.⚙️ Which actuator would you use to spin a robot’s wheels? (a) a motor (b) a display (c) a servo motor (d) a buzzer
10. 10.True or false: to water a dry plant, use a soil moisture sensor. (a) False (b) True
11. 11.🔍 Which sensor would you use to spot someone walking in? (a) a sound sensor (b) a temperature sensor (c) a motion sensor (d) a soil moisture sensor
12. 12.🔍 Which sensor would you use to warn of a gas leak? (a) a temperature sensor (b) a gas sensor (c) a soil moisture sensor (d) a light sensor
13. 13.🔍 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)?
14. 14.⚙️ Which actuator would you use to open a gate to 90°? (a) an LED (b) a servo motor (c) a display (d) a motor
15. 15.Which job needs a display? (a) show the temperature (b) move water to plants (c) turn to an exact angle (d) beep an alarm
16. 16.True or false: to open blinds at sunrise, use a sound sensor. (a) True (b) False
17. 17.Which job needs an LED? (a) beep an alarm (b) spin a robot’s wheels (c) show the temperature (d) show a status light
18. 18.🔍 Which sensor would you use to close a window in rain? (a) a rain sensor (b) a sound sensor (c) a soil moisture sensor (d) a motion sensor
19. 19.Which job needs a gas sensor? (a) measure classroom noise (b) close a window in rain (c) warn of a gas leak (d) open blinds at sunrise
20. 20.⚙️ Which actuator would you use to show the temperature? (a) a display (b) an LED (c) a servo motor (d) a motor
21. 21.Which job needs a temperature sensor? (a) make a parking alarm (b) water a dry plant (c) close a window in rain (d) keep an incubator warm
22. 22.⚙️ Which actuator would you use to turn to an exact angle? (a) an LED (b) a display (c) a buzzer (d) a servo motor
23. 23.Which job needs a distance sensor? (a) switch on lamps at dusk (b) measure classroom noise (c) switch on with a clap (d) stop a robot near walls
24. 24.Which job needs a motion sensor? (a) spot someone walking in (b) keep an incubator warm (c) open blinds at sunrise (d) warn of a gas leak
25. 25.Which job needs a soil moisture sensor? (a) close a window in rain (b) open blinds at sunrise (c) warn of a gas leak (d) water a dry plant
26. 26.🔍 Which sensor would you use to measure classroom noise? (a) a soil moisture sensor (b) a rain sensor (c) a distance sensor (d) a sound sensor
27. 27.🔍 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?
28. 28.Which job needs a light sensor? (a) keep an incubator warm (b) close a window in rain (c) water a dry plant (d) open blinds at sunrise
29. 29.🔍 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)?
30. 30.🔍 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)?
31. 31.⚙️ Which actuator would you use to beep an alarm? (a) a display (b) a pump (c) a motor (d) a buzzer
32. 32.Which job needs a sound sensor? (a) make a parking alarm (b) water a dry plant (c) open blinds at sunrise (d) switch on with a clap
33. 33.True or false: to switch on with a clap, use a sound sensor. (a) False (b) True
34. 34.🔍 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)?
35. 35.True or false: to switch on lamps at dusk, use a rain sensor. (a) True (b) False
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.True or false: to switch on lamps at dusk, use a temperature sensor. (a) False (b) True
38. 38.Which job needs a motor? (a) move water to plants (b) open a gate to 90° (c) beep an alarm (d) spin a robot’s wheels
39. 39.Which job needs a servo motor? (a) beep an alarm (b) show a status light (c) open a gate to 90° (d) show the temperature
40. 40.🔍 Which sensor would you use to make a parking alarm? (a) a sound sensor (b) a distance sensor (c) a temperature sensor (d) a motion sensor

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