Electronics Worksheet: Sensors and Actuators

Electronics lesson 26: Sensors and actuators · Set 194 · 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 spot someone walking in? (a) a rain sensor (b) a sound sensor (c) a temperature sensor (d) a motion sensor
2. 2.⚙️ Which actuator would you use to show a status light? (a) a display (b) a servo motor (c) an LED (d) a buzzer
3. 3.True or false: to switch on with a clap, use a sound sensor. (a) True (b) False
4. 4.🔍 Which sensor would you use to close a window in rain? (a) a rain sensor (b) a distance sensor (c) a gas sensor (d) a temperature sensor
5. 5.🔍 Which sensor would you use to start a fan when hot? (a) a temperature sensor (b) a sound sensor (c) a motion sensor (d) a distance sensor
6. 6.True or false: to start a fan when hot, use a light sensor. (a) True (b) False
7. 7.Which job needs a buzzer? (a) move water to plants (b) spin a robot’s wheels (c) show a status light (d) beep an alarm
8. 8.Which job needs an LED? (a) beep an alarm (b) move water to plants (c) show a status light (d) show the temperature
9. 9.True or false: to open blinds at sunrise, use a sound sensor. (a) True (b) False
10. 10.⚙️ Which actuator would you use to turn to an exact angle? (a) a display (b) an LED (c) a servo motor (d) a motor
11. 11.True or false: to measure classroom noise, use a sound sensor. (a) False (b) True
12. 12.🔍 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)?
13. 13.Which job needs a servo motor? (a) show a status light (b) open a gate to 90° (c) spin a robot’s wheels (d) move water to plants
14. 14.⚙️ Which actuator would you use to open a gate to 90°? (a) a motor (b) a display (c) a servo motor (d) a pump
15. 15.⚙️ Which actuator would you use to show the temperature? (a) an LED (b) a display (c) a pump (d) a buzzer
16. 16.Which job needs a rain sensor? (a) start a fan when hot (b) switch on lamps at dusk (c) warn of a gas leak (d) close a window in rain
17. 17.🔍 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)?
18. 18.🔍 For a microcontroller, is a sensor an input or an output? (a) an output (b) a fuse (c) an input (d) a power source
19. 19.Which job needs a servo motor? (a) show a status light (b) spin a robot’s wheels (c) move water to plants (d) turn to an exact angle
20. 20.⚙️ What is an actuator? (a) a sensor (b) a program (c) a battery (d) an output that acts
21. 21.True or false: to switch on lamps at dusk, use a light sensor. (a) True (b) False
22. 22.Which job needs a motion sensor? (a) close a window in rain (b) spot someone walking in (c) measure classroom noise (d) keep an incubator warm
23. 23.Which job needs a gas sensor? (a) switch on with a clap (b) stop a robot near walls (c) close a window in rain (d) warn of a gas leak
24. 24.Which job needs a pump? (a) open a gate to 90° (b) spin a robot’s wheels (c) move water to plants (d) turn to an exact angle
25. 25.🔍 Which sensor would you use to open blinds at sunrise? (a) a soil moisture sensor (b) a light sensor (c) a motion sensor (d) a rain sensor
26. 26.🔍 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?
27. 27.⚙️ Which actuator would you use to move water to plants? (a) a servo motor (b) a motor (c) a pump (d) an LED
28. 28.⚙️ Which actuator would you use to beep an alarm? (a) a pump (b) a buzzer (c) a servo motor (d) an LED
29. 29.Which job needs a motor? (a) spin a robot’s wheels (b) turn to an exact angle (c) show the temperature (d) show a status light
30. 30.🔍 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)?
31. 31.🔍 Which sensor would you use to measure classroom noise? (a) a distance sensor (b) a sound sensor (c) a rain sensor (d) a soil moisture sensor
32. 32.⚙️ Which actuator would you use to spin a robot’s wheels? (a) a motor (b) a buzzer (c) a pump (d) an LED
33. 33.Which job needs a temperature sensor? (a) close a window in rain (b) measure classroom noise (c) warn of a gas leak (d) start a fan when hot
34. 34.🔍 Which sensor would you use to make a parking alarm? (a) a light sensor (b) a distance sensor (c) a gas sensor (d) a sound sensor
35. 35.True or false: to water a dry plant, use a gas sensor. (a) True (b) False
36. 36.True or false: to stop a robot near walls, use a gas sensor. (a) True (b) False
37. 37.🔍 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?
38. 38.🔍 Which sensor would you use to switch on lamps at dusk? (a) a sound sensor (b) a temperature sensor (c) a light sensor (d) a motion sensor
39. 39.Which job needs a soil moisture sensor? (a) switch on lamps at dusk (b) water a dry plant (c) make a parking alarm (d) measure classroom noise
40. 40.True or false: to make a parking alarm, use a distance sensor. (a) False (b) True

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