Electronics Worksheet: Sensors and Actuators

Electronics lesson 26: Sensors and actuators · Set 203 · 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 light sensor. (a) False (b) True
2. 2.Which job needs a soil moisture sensor? (a) measure classroom noise (b) stop a robot near walls (c) water a dry plant (d) open blinds at sunrise
3. 3.Which job needs a display? (a) spin a robot’s wheels (b) move water to plants (c) show the temperature (d) turn to an exact angle
4. 4.True or false: to measure classroom noise, use a temperature sensor. (a) True (b) False
5. 5.Which job needs a buzzer? (a) show the temperature (b) move water to plants (c) beep an alarm (d) open a gate to 90°
6. 6.⚙️ What is an actuator? (a) a battery (b) a program (c) an output that acts (d) a sensor
7. 7.True or false: to measure classroom noise, use a sound sensor. (a) True (b) False
8. 8.🔍 For a microcontroller, is a sensor an input or an output? (a) an input (b) a power source (c) an output (d) a fuse
9. 9.True or false: to keep an incubator warm, use a rain sensor. (a) True (b) False
10. 10.Which job needs a motion sensor? (a) spot someone walking in (b) warn of a gas leak (c) measure classroom noise (d) switch on lamps at dusk
11. 11.⚙️ Which actuator would you use to spin a robot’s wheels? (a) a pump (b) an LED (c) a motor (d) a display
12. 12.⚙️ Which actuator would you use to show the temperature? (a) a motor (b) a buzzer (c) a pump (d) a display
13. 13.Which job needs a servo motor? (a) open a gate to 90° (b) beep an alarm (c) move water to plants (d) spin a robot’s wheels
14. 14.Which job needs a motor? (a) beep an alarm (b) move water to plants (c) spin a robot’s wheels (d) open a gate to 90°
15. 15.⚙️ Which actuator would you use to show a status light? (a) a display (b) a buzzer (c) a pump (d) an LED
16. 16.🔍 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)?
17. 17.⚙️ Which actuator would you use to move water to plants? (a) an LED (b) a display (c) a motor (d) a pump
18. 18.Which job needs a sound sensor? (a) start a fan when hot (b) spot someone walking in (c) keep an incubator warm (d) switch on with a clap
19. 19.True or false: to spot someone walking in, use a light sensor. (a) False (b) True
20. 20.Which job needs a rain sensor? (a) spot someone walking in (b) stop a robot near walls (c) close a window in rain (d) start a fan when hot
21. 21.True or false: to warn of a gas leak, use a light sensor. (a) False (b) True
22. 22.🔍 Which sensor would you use to stop a robot near walls? (a) a light sensor (b) a motion sensor (c) a distance sensor (d) a rain sensor
23. 23.⚙️ Which actuator would you use to turn to an exact angle? (a) a motor (b) a servo motor (c) a pump (d) a display
24. 24.🔍 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)?
25. 25.Which job needs a light sensor? (a) measure classroom noise (b) switch on with a clap (c) make a parking alarm (d) switch on lamps at dusk
26. 26.Which job needs a distance sensor? (a) switch on lamps at dusk (b) close a window in rain (c) warn of a gas leak (d) make a parking alarm
27. 27.True or false: to start a fan when hot, use a sound sensor. (a) True (b) False
28. 28.🔍 Which sensor would you use to open blinds at sunrise? (a) a sound sensor (b) a light sensor (c) a gas sensor (d) a rain sensor
29. 29.🔍 Which sensor would you use to switch on with a clap? (a) a soil moisture sensor (b) a sound sensor (c) a gas sensor (d) a rain sensor
30. 30.Which job needs a sound sensor? (a) switch on lamps at dusk (b) warn of a gas leak (c) water a dry plant (d) measure classroom noise
31. 31.True or false: to switch on with a clap, use a temperature sensor. (a) False (b) True
32. 32.Which job needs an LED? (a) show a status light (b) open a gate to 90° (c) turn to an exact angle (d) spin a robot’s wheels
33. 33.⚙️ Which actuator would you use to open a gate to 90°? (a) a servo motor (b) an LED (c) a pump (d) a motor
34. 34.True or false: to spot someone walking in, use a sound sensor. (a) False (b) True
35. 35.⚙️ Which actuator would you use to beep an alarm? (a) a pump (b) a buzzer (c) a motor (d) a servo motor
36. 36.🔍 An object is 153 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
37. 37.🔍 Which sensor would you use to start a fan when hot? (a) a light sensor (b) a rain sensor (c) a distance sensor (d) a temperature sensor
38. 38.🔍 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)?
39. 39.🔍 Which sensor would you use to switch on lamps at dusk? (a) a gas sensor (b) a light sensor (c) a sound sensor (d) a temperature sensor
40. 40.🔍 An object is 204 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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