Electronics Worksheet: Sensors and Actuators

Electronics lesson 26: Sensors and actuators · Set 193 · 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 make a parking alarm? (a) a gas sensor (b) a distance sensor (c) a temperature sensor (d) a light sensor
2. 2.⚙️ What is an actuator? (a) a battery (b) a program (c) an output that acts (d) a sensor
3. 3.Which job needs a display? (a) turn to an exact angle (b) move water to plants (c) show the temperature (d) beep an alarm
4. 4.True or false: to make a parking alarm, use a temperature sensor. (a) True (b) False
5. 5.🔍 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)?
6. 6.⚙️ Which actuator would you use to show a status light? (a) a buzzer (b) an LED (c) a display (d) a pump
7. 7.🔍 For a microcontroller, is a sensor an input or an output? (a) a fuse (b) an output (c) an input (d) a power source
8. 8.True or false: to measure classroom noise, use a sound sensor. (a) False (b) True
9. 9.True or false: to stop a robot near walls, use a gas sensor. (a) True (b) False
10. 10.Which job needs a distance sensor? (a) start a fan when hot (b) close a window in rain (c) make a parking alarm (d) water a dry plant
11. 11.Which job needs a servo motor? (a) move water to plants (b) beep an alarm (c) spin a robot’s wheels (d) turn to an exact angle
12. 12.🔍 Which sensor would you use to start a fan when hot? (a) a motion sensor (b) a rain sensor (c) a temperature sensor (d) a distance sensor
13. 13.Which job needs a motion sensor? (a) keep an incubator warm (b) make a parking alarm (c) close a window in rain (d) spot someone walking in
14. 14.🔍 Which sensor would you use to measure classroom noise? (a) a distance sensor (b) a sound sensor (c) a rain sensor (d) a motion sensor
15. 15.Which job needs an LED? (a) turn to an exact angle (b) spin a robot’s wheels (c) move water to plants (d) show a status light
16. 16.True or false: to warn of a gas leak, use a gas sensor. (a) False (b) True
17. 17.Which job needs a motor? (a) show the temperature (b) move water to plants (c) spin a robot’s wheels (d) beep an alarm
18. 18.🔍 Which sensor would you use to stop a robot near walls? (a) a gas sensor (b) a soil moisture sensor (c) a distance sensor (d) a sound sensor
19. 19.Which job needs a buzzer? (a) turn to an exact angle (b) show the temperature (c) beep an alarm (d) show a status light
20. 20.⚙️ Which actuator would you use to turn to an exact angle? (a) a motor (b) a buzzer (c) a servo motor (d) a pump
21. 21.Which job needs a temperature sensor? (a) water a dry plant (b) warn of a gas leak (c) close a window in rain (d) start a fan when hot
22. 22.True or false: to open blinds at sunrise, use a light sensor. (a) False (b) True
23. 23.Which job needs a gas sensor? (a) close a window in rain (b) make a parking alarm (c) warn of a gas leak (d) switch on with a clap
24. 24.🔍 Which sensor would you use to warn of a gas leak? (a) a rain sensor (b) a light sensor (c) a temperature sensor (d) a gas sensor
25. 25.⚙️ Which actuator would you use to open a gate to 90°? (a) an LED (b) a pump (c) a display (d) a servo motor
26. 26.Which job needs a rain sensor? (a) start a fan when hot (b) close a window in rain (c) open blinds at sunrise (d) water a dry plant
27. 27.🔍 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?
28. 28.True or false: to measure classroom noise, use a rain sensor. (a) True (b) False
29. 29.True or false: to spot someone walking in, use a motion sensor. (a) True (b) False
30. 30.🔍 Which sensor would you use to open blinds at sunrise? (a) a motion sensor (b) a gas sensor (c) a temperature sensor (d) a light sensor
31. 31.True or false: to water a dry plant, use a soil moisture sensor. (a) False (b) True
32. 32.🔍 Which sensor would you use to switch on with a clap? (a) a sound sensor (b) a light sensor (c) a temperature sensor (d) a distance sensor
33. 33.🔍 An object is 306 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
34. 34.🔍 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)?
35. 35.Which job needs a sound sensor? (a) warn of a gas leak (b) open blinds at sunrise (c) start a fan when hot (d) switch on with a clap
36. 36.Which job needs a servo motor? (a) show a status light (b) beep an alarm (c) open a gate to 90° (d) move water to plants
37. 37.🔍 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?
38. 38.Which job needs a soil moisture sensor? (a) keep an incubator warm (b) water a dry plant (c) warn of a gas leak (d) switch on lamps at dusk
39. 39.True or false: to open blinds at sunrise, use a motion sensor. (a) True (b) False
40. 40.⚙️ Which actuator would you use to spin a robot’s wheels? (a) a buzzer (b) a motor (c) a display (d) an LED

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