Electronics Worksheet: Sensors and Actuators

Electronics lesson 26: Sensors and actuators · Set 303 · 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 open blinds at sunrise, use a light sensor. (a) True (b) False
2. 2.🔍 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)?
3. 3.🔍 Which sensor would you use to make a parking alarm? (a) a distance sensor (b) a gas sensor (c) a sound sensor (d) a light sensor
4. 4.True or false: to measure classroom noise, use a sound sensor. (a) False (b) True
5. 5.🔍 A distance sensor sends a sound pulse and hears the echo 5 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
6. 6.🔍 Which sensor would you use to switch on lamps at dusk? (a) a soil moisture sensor (b) a distance sensor (c) a light sensor (d) a temperature sensor
7. 7.🔍 Which sensor would you use to warn of a gas leak? (a) a sound sensor (b) a soil moisture sensor (c) a motion sensor (d) a gas sensor
8. 8.⚙️ Which actuator would you use to move water to plants? (a) a display (b) a servo motor (c) a pump (d) an LED
9. 9.True or false: to keep an incubator warm, use a distance sensor. (a) False (b) True
10. 10.Which job needs a pump? (a) show a status light (b) move water to plants (c) turn to an exact angle (d) spin a robot’s wheels
11. 11.Which job needs a servo motor? (a) move water to plants (b) beep an alarm (c) spin a robot’s wheels (d) open a gate to 90°
12. 12.🔍 Which sensor would you use to water a dry plant? (a) a distance sensor (b) a soil moisture sensor (c) a gas sensor (d) a light sensor
13. 13.True or false: to stop a robot near walls, use a light sensor. (a) True (b) False
14. 14.⚙️ Which actuator would you use to spin a robot’s wheels? (a) a motor (b) a buzzer (c) a servo motor (d) an LED
15. 15.Which job needs an LED? (a) open a gate to 90° (b) turn to an exact angle (c) beep an alarm (d) show a status light
16. 16.⚙️ Which actuator would you use to beep an alarm? (a) a buzzer (b) an LED (c) a pump (d) a servo motor
17. 17.Which job needs a motion sensor? (a) close a window in rain (b) spot someone walking in (c) start a fan when hot (d) keep an incubator warm
18. 18.🔍 Which sensor would you use to measure classroom noise? (a) a sound sensor (b) a temperature sensor (c) a gas sensor (d) a light sensor
19. 19.Which job needs a temperature sensor? (a) switch on with a clap (b) close a window in rain (c) switch on lamps at dusk (d) keep an incubator warm
20. 20.Which job needs a servo motor? (a) move water to plants (b) show a status light (c) spin a robot’s wheels (d) turn to an exact angle
21. 21.🔍 An object is 17 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
22. 22.True or false: to switch on with a clap, use a gas sensor. (a) False (b) True
23. 23.🔍 Which sensor would you use to switch on with a clap? (a) a temperature sensor (b) a light sensor (c) a distance sensor (d) a sound sensor
24. 24.Which job needs a sound sensor? (a) keep an incubator warm (b) water a dry plant (c) switch on lamps at dusk (d) switch on with a clap
25. 25.Which job needs a light sensor? (a) switch on lamps at dusk (b) stop a robot near walls (c) measure classroom noise (d) spot someone walking in
26. 26.Which job needs a light sensor? (a) keep an incubator warm (b) open blinds at sunrise (c) stop a robot near walls (d) spot someone walking in
27. 27.Which job needs a motor? (a) spin a robot’s wheels (b) move water to plants (c) show a status light (d) turn to an exact angle
28. 28.🔍 Which sensor would you use to keep an incubator warm? (a) a soil moisture sensor (b) a motion sensor (c) a light sensor (d) a temperature sensor
29. 29.🔍 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)?
30. 30.Which job needs a buzzer? (a) turn to an exact angle (b) beep an alarm (c) spin a robot’s wheels (d) open a gate to 90°
31. 31.Which job needs a distance sensor? (a) warn of a gas leak (b) switch on lamps at dusk (c) measure classroom noise (d) make a parking alarm
32. 32.⚙️ Which actuator would you use to turn to an exact angle? (a) an LED (b) a buzzer (c) a pump (d) a servo motor
33. 33.Which job needs a display? (a) open a gate to 90° (b) beep an alarm (c) show the temperature (d) turn to an exact angle
34. 34.🔍 For a microcontroller, is a sensor an input or an output? (a) an output (b) a power source (c) an input (d) a fuse
35. 35.True or false: to spot someone walking in, use a soil moisture sensor. (a) True (b) False
36. 36.⚙️ Which actuator would you use to show a status light? (a) an LED (b) a motor (c) a buzzer (d) a servo motor
37. 37.True or false: to switch on lamps at dusk, use a light sensor. (a) False (b) True
38. 38.⚙️ What is an actuator? (a) an output that acts (b) a program (c) a battery (d) a sensor
39. 39.🔍 An object is 136 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
40. 40.Which job needs a soil moisture sensor? (a) spot someone walking in (b) start a fan when hot (c) open blinds at sunrise (d) water a dry plant

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