Electronics Worksheet: Sensors and Actuators

Electronics lesson 26: Sensors and actuators · Set 16 · 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.⚙️ What is an actuator? (a) a battery (b) a program (c) an output that acts (d) a sensor
2. 2.🔍 An object is 102 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
3. 3.🔍 Which sensor would you use to switch on lamps at dusk? (a) a rain sensor (b) a gas sensor (c) a light sensor (d) a distance sensor
4. 4.⚙️ Which actuator would you use to show the temperature? (a) a display (b) a motor (c) a servo motor (d) an LED
5. 5.Which job needs a gas sensor? (a) spot someone walking in (b) warn of a gas leak (c) close a window in rain (d) measure classroom noise
6. 6.True or false: to start a fan when hot, use a light sensor. (a) False (b) True
7. 7.Which job needs a temperature sensor? (a) spot someone walking in (b) switch on lamps at dusk (c) start a fan when hot (d) make a parking alarm
8. 8.Which job needs an LED? (a) move water to plants (b) beep an alarm (c) show a status light (d) open a gate to 90°
9. 9.Which job needs a soil moisture sensor? (a) open blinds at sunrise (b) start a fan when hot (c) water a dry plant (d) spot someone walking in
10. 10.True or false: to spot someone walking in, use a sound sensor. (a) False (b) True
11. 11.⚙️ Which actuator would you use to move water to plants? (a) a buzzer (b) a pump (c) a motor (d) an LED
12. 12.Which job needs a motion sensor? (a) measure classroom noise (b) switch on lamps at dusk (c) spot someone walking in (d) water a dry plant
13. 13.🔍 Which sensor would you use to open blinds at sunrise? (a) a sound sensor (b) a gas sensor (c) a light sensor (d) a motion sensor
14. 14.🔍 Which sensor would you use to make a parking alarm? (a) a gas sensor (b) a rain sensor (c) a temperature sensor (d) a distance sensor
15. 15.True or false: to water a dry plant, use a temperature sensor. (a) False (b) True
16. 16.⚙️ Which actuator would you use to open a gate to 90°? (a) a pump (b) a buzzer (c) a servo motor (d) a motor
17. 17.Which job needs a servo motor? (a) beep an alarm (b) show a status light (c) move water to plants (d) turn to an exact angle
18. 18.Which job needs a temperature sensor? (a) make a parking alarm (b) water a dry plant (c) stop a robot near walls (d) keep an incubator warm
19. 19.Which job needs a servo motor? (a) show a status light (b) show the temperature (c) spin a robot’s wheels (d) open a gate to 90°
20. 20.🔍 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)?
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.🔍 For a microcontroller, is a sensor an input or an output? (a) an input (b) an output (c) a power source (d) a fuse
23. 23.🔍 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?
24. 24.True or false: to switch on lamps at dusk, use a light sensor. (a) True (b) False
25. 25.Which job needs a motor? (a) show a status light (b) open a gate to 90° (c) move water to plants (d) spin a robot’s wheels
26. 26.True or false: to measure classroom noise, use a sound sensor. (a) False (b) True
27. 27.🔍 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)?
28. 28.Which job needs a sound sensor? (a) stop a robot near walls (b) measure classroom noise (c) start a fan when hot (d) close a window in rain
29. 29.🔍 Which sensor would you use to keep an incubator warm? (a) a light sensor (b) a motion sensor (c) a temperature sensor (d) a distance sensor
30. 30.🔍 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)?
31. 31.🔍 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)?
32. 32.⚙️ Which actuator would you use to spin a robot’s wheels? (a) a buzzer (b) a motor (c) a servo motor (d) an LED
33. 33.🔍 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)?
34. 34.🔍 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?
35. 35.🔍 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?
36. 36.🔍 A distance sensor sends a sound pulse and hears the echo 8 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
37. 37.Which job needs a display? (a) show the temperature (b) show a status light (c) move water to plants (d) spin a robot’s wheels
38. 38.Which job needs a pump? (a) move water to plants (b) turn to an exact angle (c) beep an alarm (d) show the temperature
39. 39.True or false: to stop a robot near walls, use a distance sensor. (a) True (b) False
40. 40.🔍 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?

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