Electronics Worksheet: Sensors and Actuators

Electronics lesson 26: Sensors and actuators · Set 299 · 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 stop a robot near walls, use a motion sensor. (a) False (b) True
2. 2.⚙️ What is an actuator? (a) a program (b) a sensor (c) a battery (d) an output that acts
3. 3.🔍 Which sensor would you use to warn of a gas leak? (a) a rain sensor (b) a temperature sensor (c) a gas sensor (d) a soil moisture sensor
4. 4.Which job needs a light sensor? (a) start a fan when hot (b) switch on lamps at dusk (c) stop a robot near walls (d) warn of a gas leak
5. 5.🔍 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)?
6. 6.⚙️ Which actuator would you use to show a status light? (a) an LED (b) a display (c) a buzzer (d) a pump
7. 7.🔍 Which sensor would you use to make a parking alarm? (a) a rain sensor (b) a distance sensor (c) a gas sensor (d) a soil moisture sensor
8. 8.🔍 A distance sensor sends a sound pulse and hears the echo 18 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
9. 9.🔍 Which sensor would you use to close a window in rain? (a) a light sensor (b) a soil moisture sensor (c) a sound sensor (d) a rain sensor
10. 10.Which job needs a buzzer? (a) turn to an exact angle (b) open a gate to 90° (c) beep an alarm (d) show the temperature
11. 11.🔍 Which sensor would you use to open blinds at sunrise? (a) a light sensor (b) a motion sensor (c) a rain sensor (d) a distance sensor
12. 12.True or false: to keep an incubator warm, use a temperature sensor. (a) False (b) True
13. 13.🔍 Which sensor would you use to keep an incubator warm? (a) a distance sensor (b) a soil moisture sensor (c) a temperature sensor (d) a light sensor
14. 14.⚙️ Which actuator would you use to open a gate to 90°? (a) a display (b) a buzzer (c) a pump (d) a servo motor
15. 15.⚙️ Which actuator would you use to turn to an exact angle? (a) a buzzer (b) a pump (c) an LED (d) a servo motor
16. 16.Which job needs a rain sensor? (a) switch on lamps at dusk (b) warn of a gas leak (c) make a parking alarm (d) close a window in rain
17. 17.🔍 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)?
18. 18.Which job needs an LED? (a) show the temperature (b) show a status light (c) move water to plants (d) beep an alarm
19. 19.⚙️ Which actuator would you use to beep an alarm? (a) an LED (b) a display (c) a buzzer (d) a pump
20. 20.🔍 An object is 255 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
21. 21.Which job needs a servo motor? (a) turn to an exact angle (b) spin a robot’s wheels (c) move water to plants (d) show a status light
22. 22.True or false: to make a parking alarm, use a distance sensor. (a) True (b) False
23. 23.True or false: to keep an incubator warm, use a sound sensor. (a) False (b) True
24. 24.🔍 A distance sensor sends a sound pulse and hears the echo 14 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
25. 25.🔍 For a microcontroller, is a sensor an input or an output? (a) a power source (b) an output (c) an input (d) a fuse
26. 26.Which job needs a soil moisture sensor? (a) switch on lamps at dusk (b) water a dry plant (c) stop a robot near walls (d) spot someone walking in
27. 27.🔍 Which sensor would you use to spot someone walking in? (a) a gas sensor (b) a temperature sensor (c) a motion sensor (d) a sound sensor
28. 28.Which job needs a sound sensor? (a) open blinds at sunrise (b) measure classroom noise (c) close a window in rain (d) make a parking alarm
29. 29.Which job needs a servo motor? (a) beep an alarm (b) show a status light (c) spin a robot’s wheels (d) open a gate to 90°
30. 30.Which job needs a motion sensor? (a) make a parking alarm (b) stop a robot near walls (c) warn of a gas leak (d) spot someone walking in
31. 31.🔍 Which sensor would you use to measure classroom noise? (a) a sound sensor (b) a distance sensor (c) a gas sensor (d) a light sensor
32. 32.Which job needs a distance sensor? (a) switch on lamps at dusk (b) switch on with a clap (c) stop a robot near walls (d) close a window in rain
33. 33.⚙️ Which actuator would you use to move water to plants? (a) an LED (b) a servo motor (c) a buzzer (d) a pump
34. 34.🔍 Which sensor would you use to stop a robot near walls? (a) a temperature sensor (b) a distance sensor (c) a motion sensor (d) a rain sensor
35. 35.True or false: to spot someone walking in, use a motion sensor. (a) False (b) True
36. 36.Which job needs a temperature sensor? (a) measure classroom noise (b) warn of a gas leak (c) start a fan when hot (d) make a parking alarm
37. 37.True or false: to stop a robot near walls, use a distance sensor. (a) False (b) True
38. 38.🔍 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?
39. 39.⚙️ Which actuator would you use to spin a robot’s wheels? (a) a motor (b) a display (c) a buzzer (d) a pump
40. 40.Which job needs a light sensor? (a) keep an incubator warm (b) warn of a gas leak (c) open blinds at sunrise (d) spot someone walking in

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